PROTOCOL SYSTEMS INC/NEW
424B3, 1996-06-07
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>
                             PROTOCOL SYSTEMS, INC.
                           8500 S.W. CREEKSIDE PLACE
                            BEAVERTON, OREGON 97008
 
                                                                    June 5, 1996
 
Dear Shareholder:
 
    You  are cordially invited to attend the Annual Meeting of Shareholders (the
"Protocol Annual Meeting") of Protocol Systems, Inc. ("Protocol"), which will be
held on  Wednesday, July  10, 1996,  at 10:00  a.m., local  time, at  Protocol's
offices at 8500 S.W. Creekside Place, Beaverton, Oregon 97008.
 
    At  the Protocol Annual Meeting, you will be asked to consider and vote upon
a proposal to approve the issuance (the "Issuance") of shares of common stock of
Protocol (the "Protocol Common Stock") to the shareholders of Pryon  Corporation
("Pryon")  in  connection with  an  Agreement and  Plan  of Merger  among Pryon,
Protocol and  Protocol  Merger  Corporation  ("Merger  Sub"),  a  subsidiary  of
Protocol  (the "Merger Agreement"),  which provides for the  merger of Pryon and
Merger Sub (the "Merger"). Pursuant to the Merger Agreement Pryon will become  a
wholly  owned  subsidiary of  Protocol,  and all  of  the outstanding  shares of
capital stock of Pryon  will be converted into  shares of Protocol Common  Stock
based  on an  exchange ratio  which will be  determined according  to the Merger
Agreement. You will also be asked to elect two directors to Protocol's Board  of
Directors,  approve amendments to the Protocol 1992 Stock Incentive Plan and the
Protocol 1993 Stock  Option Plan  for Nonemployee  Directors and  to ratify  the
appointment  of KPMG Peat Marwick LLP as independent auditors of the Company for
the fiscal year ending December 31, 1996.
 
    You should  read carefully  the  accompanying Notice  of Annual  Meeting  of
Shareholders and the Joint Proxy Statement/Prospectus for details of the Merger,
including  information  about the  exchange ratio  and the  number of  shares of
Protocol Common Stock to be issued in connection with the Merger and  additional
related information.
 
    Whether  or  not you  plan  to attend  the  Protocol Annual  Meeting, please
complete, sign and date the  enclosed proxy card and  return it promptly in  the
enclosed  postage-prepaid envelope. Your proxy may be revoked at any time before
it is voted by  signing and returning  a later-dated proxy  with respect to  the
same  shares or by  filing with the  Secretary of Protocol  a written revocation
bearing a later date. If you attend the Protocol Annual Meeting, you may vote in
person if you wish,  even though you previously  have returned your proxy  card.
Your prompt cooperation will be greatly appreciated.
 
                                          Sincerely,
 
                                          James B. Moon
                                          PRESIDENT & CHIEF EXECUTIVE OFFICER
<PAGE>
                             PROTOCOL SYSTEMS, INC.
                           8500 S.W. CREEKSIDE PLACE
                            BEAVERTON, OREGON 97008
 
                    NOTICE OF ANNUAL MEETING OF SHAREHOLDERS
                            TO BE HELD JULY 10, 1996
 
TO THE SHAREHOLDERS OF PROTOCOL SYSTEMS, INC.:
 
    The  Annual  Meeting  of  Shareholders (the  "Protocol  Annual  Meeting") of
Protocol System, Inc., an Oregon corporation ("Protocol"), will be held on  July
10,  1996,  at  10:00 a.m.,  local  time,  at Protocol's  offices  at  8500 S.W.
Creekside Place, Beaverton, Oregon 97008, for the following purposes:
 
1.   To  consider  and  vote  upon a  proposal  to  approve  the  issuance  (the
    "Issuance")  of shares  of common  stock of  Protocol (the  "Protocol Common
    Stock") to the  shareholders of  Pryon Corporation  ("Pryon") in  connection
    with  an Agreement and  Plan of Merger,  dated as of  February 20, 1996 (the
    "Merger Agreement"), among Pryon, Protocol and Protocol Merger  Corporation,
    a  Wisconsin corporation and a wholly  owned subsidiary of Protocol ("Merger
    Sub"), which  provides  for  the  merger  of  Merger  Sub  into  Pryon  (the
    "Merger").  Pursuant to  the Merger  Agreement, Pryon  will become  a wholly
    owned subsidiary of  Protocol, and  all of the  shares of  capital stock  of
    Pryon  (the "Pryon Stock")  issued and outstanding  immediately prior to the
    Merger will be converted  into shares of Protocol  Common Stock based on  an
    exchange  ratio which will be determined  according to the Merger Agreement.
    The Merger,  including  the exchange  ratio  and  the number  of  shares  of
    Protocol  Common Stock to be  issued in connection with  the Merger, is more
    completely described in the  accompanying Joint Proxy  Statement/Prospectus,
    and a copy of the Merger Agreement is attached as Appendix A thereto.
 
2.  To elect two directors, each to hold office for a three-year term.
 
3.  To approve a proposed amendment to the Protocol 1992 Stock Incentive Plan.
 
4.   To approve proposed  amendments to the Protocol  1993 Stock Option Plan for
    Nonemployee Directors.
 
5.  To ratify the appointment of KPMG Peat Marwick LLP as Protocol's independent
    auditors for the fiscal year ending December 31, 1996.
 
6.  To transact  such other business  as may properly  come before the  Protocol
    Annual Meeting or any adjournments or postponements thereof.
 
    Only  holders of record of Protocol Common Stock at the close of business on
May 6, 1996, the record  date for the Protocol  Annual Meeting, are entitled  to
notice  of and to  vote at the  Protocol Annual Meeting  and any adjournments or
postponements thereof.
 
    Whether or  not you  plan  to attend  the  Protocol Annual  Meeting,  please
complete,  sign and date the  enclosed proxy card and  return it promptly in the
enclosed postage-prepaid envelope. Your proxy may be revoked at any time  before
it  is voted by  signing and returning  a later-dated proxy  with respect to the
same shares,  by filing  with the  Secretary of  Protocol a  written  revocation
bearing a later date or by attending and voting at the Protocol Annual Meeting.
 
                                          PROTOCOL SYSTEMS, INC.
 
                                          James B. Moon
                                          PRESIDENT & CHIEF EXECUTIVE OFFICER
Beaverton, Oregon
June 5, 1996
<PAGE>
                               PRYON CORPORATION
                            N93 W14575 WHITTAKER WAY
                        MENOMONEE FALLS, WISCONSIN 53051
 
                                                                    June 5, 1996
 
Dear Shareholder:
 
    A  Special Meeting  of Shareholders of  Pryon Corporation  ("Pryon") will be
held on Monday, July 8, 1996, at  10:00 a.m., local time, at Pryon's offices  at
N93 W14575 Whittaker Way, Menomonee Falls, Wisconsin 53051.
 
    At  this Special Meeting,  you will be  asked to consider  and vote upon the
approval and adoption of a  merger agreement (the "Merger Agreement")  providing
for  the merger (the "Merger")  of Pryon with a  subsidiary of Protocol Systems,
Inc.   ("Protocol"),   as   described   in   the   accompanying   Joint    Proxy
Statement/Prospectus.  Pursuant to the Merger, Pryon will become a subsidiary of
Protocol, and  (i) all  outstanding shares  of  Pryon's Series  A and  Series  B
Preferred  Stock and all  outstanding shares of  Pryon's common stock (together,
the "Pryon Stock"), other  than dissenters' shares, will  be converted into  and
exchanged for shares of common stock, $.01 par value, of Protocol (the "Protocol
Common  Stock"), and (ii) all outstanding  options to acquire Pryon Common Stock
will be converted into options to acquire Protocol Common Stock. Each holder  of
Pryon Stock (other than dissenting shareholders) will receive shares of Protocol
Common  Stock in exchange  for shares of  Pryon Stock owned  by such shareholder
based upon an exchange  ratio which will be  determined according to the  Merger
Agreement.  For more information  regarding the consideration  to be received by
Pryon shareholders in the Merger, please  refer to the accompanying Joint  Proxy
Statement/Prospectus, under "Terms of the Merger -- Conversion of Pryon Stock in
the Merger."
 
    The  Pryon Board of Directors has approved the Merger Agreement described in
the  attached  material  and  the  transactions  contemplated  thereby  and  has
determined  that  the  Merger  is  in  the  best  interests  of  Pryon  and  its
shareholders. After careful consideration, the  Board of Directors recommends  a
vote in favor of the Merger.
 
    In  the material accompanying this letter, you will find a Notice of Special
Meeting of  Shareholders, a  Joint Proxy  Statement/Prospectus relating  to  the
actions  to be taken by Pryon shareholders at the Special Meeting, and a form of
appointment of proxy. The Joint Proxy Statement/Prospectus more fully  describes
the proposed Merger and includes information about Protocol and Pryon.
 
    All  shareholders are  cordially invited  to attend  the Special  Meeting in
person. However, whether or not you  plan to attend the Special Meeting,  please
complete,  sign, date and return  your proxy or proxies  in the enclosed postage
paid envelope. A  shareholder who attends  the Special Meeting  will be able  to
vote  his or her shares whether or not he or she has granted a proxy and will be
able to revoke  such proxy at  any time  before the shares  covered thereby  are
voted at the Special Meeting by filing with the Secretary of Pryon an instrument
revoking  it or a duly  executed proxy bearing a later  date or by attendance at
the Special Meeting and voting  in person. It is  important that your shares  be
represented and voted at the Special Meeting.
 
                                          Sincerely,
 
                                          Daniel F. Carsten
                                          PRESIDENT AND CHIEF EXECUTIVE OFFICER
<PAGE>
                               PRYON CORPORATION
                            N93 W14575 WHITTAKER WAY
                        MENOMONEE FALLS, WISCONSIN 53051
                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                           TO BE HELD ON JULY 8, 1996
 
TO THE SHAREHOLDERS:
 
    A  Special  Meeting  of  Shareholders  of  Pryon  Corporation,  a  Wisconsin
corporation ("Pryon"), will  be held  on Friday, July  8, 1996,  at 10:00  a.m.,
local   time,  at  the  offices  of  Pryon.  At  the  Special  Meeting,  Pryon's
shareholders will be asked to consider and  vote upon a proposal to approve  and
adopt  the Agreement and  Plan of Merger  dated as of  February 20, 1996 entered
into by and among  Protocol Systems, Inc.,  an Oregon corporation  ("Protocol"),
Protocol   Merger  Corporation,  a  Wisconsin  corporation  and  a  wholly-owned
subsidiary of Protocol ("Merger Sub"),  and Pryon (the "Merger Agreement").  The
Merger  Agreement provides  that (i)  Merger Sub  will be  merged with  and into
Pryon, with  Pryon  remaining  as  the  surviving  corporation  and  becoming  a
wholly-owned  subsidiary of Protocol (the "Merger"), (ii) all outstanding shares
of Pryon's Series A Preferred Stock, $0.10 par value per share ("Pryon Series  A
Preferred  Stock")  and Series  B Preferred  Stock, $0.10  par value  per share,
("Pryon Series B Preferred Stock")  (collectively, the "Pryon Preferred  Stock")
and  all outstanding  shares of  Pryon's Common  Stock, $0.10  par value ("Pryon
Common Stock") (together, the Pryon Preferred  Stock and Pryon Common Stock  are
referred  to  as the  "Pryon  Stock"), other  than  dissenters' shares,  will be
converted into and  exchanged for shares  of common stock,  $0.01 par value,  of
Protocol  (the "Protocol  Common Stock"), and  (iii) all  outstanding options to
acquire Pryon Common Stock  will be converted into  options to acquire  Protocol
Common  Stock. Each holder  of Pryon Stock  (other than dissenting shareholders)
will receive shares  of Protocol Common  Stock in exchange  for shares of  Pryon
Stock  owned by  such shareholder  based upon  an exchange  ratio which  will be
determined according to the Merger Agreement. The exchange ratio is described in
more detail in the accompanying Joint Proxy Statement/Prospectus under "Terms of
the Merger -- Conversion of Pryon Stock in the Merger." The Merger is more fully
described in,  and the  Merger Agreement  is attached  in its  entirety to,  the
accompanying Joint Proxy Statement/Prospectus.
 
    Only  shareholders of record at  the close of business  on June 3, 1996, are
entitled  to  notice  of  and  to  vote  at  the  Special  Meeting,  or  at  any
continuance(s)  or adjournment(s) thereof.  APPROVAL AND ADOPTION  OF THE MERGER
AGREEMENT REQUIRES THE AFFIRMATIVE  VOTE OF THE  HOLDERS OF SHARES  REPRESENTING
(i)  A MAJORITY  OF THE  NUMBER OF  SHARES OF  PRYON STOCK  OUTSTANDING AND (ii)
66 2/3% OF THE NUMBER OF SHARES OF PRYON PREFERRED STOCK OUTSTANDING.
 
    AS  DESCRIBED  IN   THE  ACCOMPANYING   JOINT  PROXY   STATEMENT/PROSPECTUS,
SHAREHOLDERS AND BENEFICIAL SHAREHOLDERS OF PRYON WILL BE ENTITLED TO PAYMENT OF
THE  FAIR VALUE  OF THOSE  SHARES WHICH  ARE NOT  VOTED IN  FAVOR OF  THE MERGER
AGREEMENT, IF WRITTEN NOTICE  OF THE SHAREHOLDERS' INTENT  TO DEMAND PAYMENT  IF
THE  MERGER AGREEMENT AND MERGER  ARE APPROVED IS DELIVERED  TO PRYON BEFORE THE
VOTE IS TAKEN AND THE REQUIREMENTS OF SECTIONS 180.1301 THROUGH 180.1331 OF  THE
WISCONSIN BUSINESS CORPORATION LAW ARE MET.
 
    Shareholders of Pryon, regardless of whether they plan to attend the Special
Meeting,   are  requested  to  execute  and  return  promptly  the  accompanying
Appointment of Proxy, which is solicited by  the Board of Directors of Pryon.  A
shareholder  who attends  the Special Meeting  will be  able to vote  his or her
shares whether or not he or she has  granted a Proxy and will be able to  revoke
such  Proxy  at any  time before  the shares  covered thereby  are voted  at the
Special Meeting by filing with the Secretary of Pryon an instrument revoking  it
or  a duly executed proxy  bearing a later date or  by attendance at the Special
Meeting and voting  in person. If  you are represented  at the Special  Meeting,
either in person or by proxy, and you abstain from voting on a particular matter
or  matters, you will still  be considered to be  present at the Special Meeting
for purposes of determining  whether a quorum is  present. A prompt response  is
helpful and your cooperation will be appreciated.
 
                                          By Order of the Board of Directors,
 
Menomonee Falls, Wisconsin        Daniel F. Carsten
June 5, 1996                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
<PAGE>
                             JOINT PROXY STATEMENT
                                       OF
                             PROTOCOL SYSTEMS, INC.
                                      AND
                               PRYON CORPORATION
 
                             ---------------------
 
                                   PROSPECTUS
                                       OF
                             PROTOCOL SYSTEMS, INC.
 
                             ---------------------
 
    This  Joint Proxy Statement/Prospectus is being furnished to shareholders of
Protocol Systems, Inc., an Oregon  corporation ("Protocol"), in connection  with
the  solicitation of  proxies by  Protocol's Board  of Directors  (the "Protocol
Board") for use at  the Annual Meeting  of Shareholders to be  held on July  10,
1996,  commencing  at  10:00  a.m.,  local  time,  and  at  any  adjournments or
postponements thereof.
 
    This  Joint   Proxy  Statement/Prospectus   is  also   being  furnished   to
shareholders  of  Pryon  Corporation,  a  Wisconsin  corporation  ("Pryon"),  in
connection with the solicitation of proxies  by the Board of Directors of  Pryon
for  use at the Special Meeting  of Shareholders to be held  on July 8, 1996, at
Pryon's offices at N93 W14575  Whittaker Way, Menomonee Falls, Wisconsin  53051,
commencing  at 10:00 a.m.,  local time, and at  any adjournments or continuances
thereof.
 
    This Joint  Proxy Statement/Prospectus  relates to  the proposed  merger  of
Protocol  Merger Corporation,  a newly  formed Wisconsin  corporation and wholly
owned subsidiary of Protocol, with and  into Pryon (the "Merger"). Protocol  has
filed  a Registration  Statement on  Form S-4  with the  Securities and Exchange
Commission under  the Securities  Act of  1933, as  amended, relating  to up  to
2,320,843  shares  of  common  stock,  par  value  $.01  per  share  of Protocol
("Protocol Common Stock"), issuable  in connection with  the Merger. This  Joint
Proxy  Statement/Prospectus constitutes the Prospectus  of Protocol with respect
to the  shares  of  Protocol Common  Stock  to  be issued  in  the  Merger.  All
information  contained  in  this Joint  Proxy  Statement/Prospectus  relating to
Protocol has been  supplied by  Protocol, and all  information contained  herein
relating to Pryon has been supplied by Pryon.
 
    This  Joint Proxy Statement/Prospectus is first being mailed to shareholders
of Protocol and Pryon on or about June 5, 1996.
 
    THE SHARES OF  PROTOCOL COMMON STOCK  ISSUABLE IN THE  MERGER HAVE NOT  BEEN
APPROVED  OR DISAPPROVED BY THE SECURITIES  AND EXCHANGE COMMISSION OR ANY STATE
SECURITIES COMMISSION, NOR HAS THE COMMISSION OR ANY STATE SECURITIES COMMISSION
PASSED UPON THE  ACCURACY OR  ADEQUACY OF THIS  PROXY STATEMENT/PROSPECTUS.  ANY
REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
                            ------------------------
 
    FOR  A DESCRIPTION OF CERTAIN FACTORS  PRYON SHAREHOLDERS SHOULD CONSIDER IN
EVALUATING THE MERGER AND THE ACQUISITION  OF THE PROTOCOL COMMON STOCK  OFFERED
HEREBY, SEE "RISK FACTORS" AT PAGE 12.
 
                             ---------------------
 
       The date of this Joint Proxy Statement/Prospectus is June 4, 1996.
<PAGE>
                             AVAILABLE INFORMATION
 
    Protocol  is subject  to the information  and reporting  requirements of the
Securities Exchange  Act  of 1934,  as  amended  (the "Exchange  Act"),  and  in
accordance  therewith files reports, proxy statements and other information with
the Securities and Exchange Commission  (the "Commission"). Such reports,  proxy
statements  and  other information  may be  inspected and  copied at  the public
reference facilities maintained  by the  Commission at 450  Fifth Street,  N.W.,
Washington,  D.C.  20549,  and at  certain  regional offices  of  the Commission
located at  Suite 1400,  Northwestern Atrium  Center, 500  West Madison  Street,
Chicago,  Illinois 60661, and  7 World Trade  Center, 13th Floor,  New York, New
York 10048. Copies of such information can be obtained at prescribed rates  from
the  Public  Reference  Section  of  the  Commission,  450  Fifth  Street, N.W.,
Washington, D.C. 20549. This Joint  Proxy Statement/Prospectus does not  contain
all  the information set  forth in the  Registration Statement on  Form S-4 (the
"Registration Statement")  filed  by  Protocol with  the  Commission  under  the
Securities  Act of  1933, as amended,  (the "Securities Act"),  certain parts of
which  are  omitted  in  accordance  with  the  rules  and  regulations  of  the
Commission.  The Registration  Statement and  any amendments  thereto, including
exhibits as a  part thereof,  are available for  inspection and  copying as  set
forth above.
 
    Pryon  is not subject  to the information and  reporting requirements of the
Exchange Act.
 
    THIS JOINT PROXY  STATEMENT/PROSPECTUS INCORPORATES  DOCUMENTS BY  REFERENCE
WHICH  ARE  NOT  PRESENTED HEREIN  OR  DELIVERED  HEREWITH. COPIES  OF  ANY SUCH
DOCUMENTS, OTHER  THAN EXHIBITS  TO SUCH  DOCUMENTS WHICH  ARE NOT  SPECIFICALLY
INCORPORATED  BY REFERENCE THEREIN, ARE AVAILABLE  WITHOUT CHARGE TO ANY PERSON,
INCLUDING ANY BENEFICIAL OWNER, TO  WHOM THIS JOINT PROXY STATEMENT/  PROSPECTUS
IS  DELIVERED, UPON WRITTEN OR ORAL  REQUEST TO THE SECRETARY, PROTOCOL SYSTEMS,
INC., 8500 S.W. CREEKSIDE PLACE, BEAVERTON, OREGON 97008, TELEPHONE NUMBER (503)
526-8500. TO ENSURE TIMELY DELIVERY OF THE DOCUMENTS, ANY REQUEST SHOULD BE MADE
BEFORE JUNE 25, 1996.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    Protocol's Annual Report on Form 10-K for the fiscal year ended December 31,
1995 and Protocol's Quarterly  Report on Form 10-Q  for the quarter ended  March
31,  1996 previously filed with the Commission  pursuant to the Exchange Act are
incorporated herein by this reference. All documents filed by Protocol  pursuant
to  Section 13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to the date
hereof and prior to the date of  the Protocol Annual Meeting shall be deemed  to
be  incorporated by reference herein  and to be a part  hereof from the date any
such document is filed. The information  relating to Protocol contained in  this
Joint Proxy Statement/Prospectus does not purport to be comprehensive and should
be  read  together  with  the  information  in  the  documents  incorporated  by
reference.
 
    Any  statement  contained  in  a  document  incorporated  or  deemed  to  be
incorporated  by reference herein  shall be deemed to  be modified or superseded
for purposes hereof to the extent that  a statement contained herein (or in  any
other  subsequently  filed  document  which also  is  incorporated  by reference
herein) modifies  or supersedes  such statement.  Any statement  so modified  or
superseded shall not be deemed to constitute a part hereof except as so modified
or    superseded.   All    information   appearing    in   this    Joint   Proxy
Statement/Prospectus is  qualified  in  its  entirety  by  the  information  and
financial  statements  (including  notes  thereto)  appearing  in  the documents
incorporated herein  by  reference,  except  to the  extent  set  forth  in  the
immediately preceding statement.
 
    NO   PERSON  IS  AUTHORIZED   TO  GIVE  ANY  INFORMATION   OR  TO  MAKE  ANY
REPRESENTATIONS WITH  RESPECT  TO THE  MATTERS  DESCRIBED IN  THIS  JOINT  PROXY
STATEMENT/PROSPECTUS  OTHER  THAN THOSE  CONTAINED  HEREIN OR  IN  THE DOCUMENTS
INCORPORATED BY  REFERENCE  HEREIN.  ANY  INFORMATION  OR  REPRESENTATIONS  WITH
RESPECT  TO SUCH MATTERS NOT CONTAINED HEREIN OR THEREIN MUST NOT BE RELIED UPON
AS  HAVING   BEEN  AUTHORIZED   BY   PROTOCOL  OR   PRYON.  THIS   JOINT   PROXY
STATEMENT/PROSPECTUS  DOES NOT CONSTITUTE AN OFFER  TO SELL OR A SOLICITATION OF
AN OFFER
 
                                      (i)
<PAGE>
TO BUY SECURITIES IN ANY  JURISDICTION TO ANY PERSON TO  WHOM IT IS UNLAWFUL  TO
MAKE  SUCH OFFER OR  SOLICITATION IN SUCH JURISDICTION.  NEITHER THE DELIVERY OF
THIS JOINT PROXY STATEMENT/PROSPECTUS NOR  ANY SALE MADE HEREUNDER SHALL,  UNDER
ANY  CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE  HAS BEEN NO CHANGE IN THE
AFFAIRS OF PROTOCOL OR PRYON  SINCE THE DATE HEREOF  OR THAT THE INFORMATION  IN
THIS  JOINT  PROXY  STATEMENT/PROSPECTUS  OR IN  THE  DOCUMENTS  INCORPORATED BY
REFERENCE HEREIN IS  CORRECT AS OF  ANY TIME  SUBSEQUENT TO THE  DATE HEREOF  OR
THEREOF.
 
                                      (ii)
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<S>                                                                                     <C>
SUMMARY...............................................................................          1
  General.............................................................................          1
  The Companies.......................................................................          1
  Meetings of Shareholders............................................................          1
  The Merger..........................................................................          2
  Risk Factors........................................................................          7
SELECTED HISTORICAL AND UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA.........          8
COMPARATIVE PER SHARE DATA............................................................         10
COMPARATIVE PER SHARE MARKET INFORMATION..............................................         11
  Protocol............................................................................         11
  Pryon...............................................................................         11
RISK FACTORS..........................................................................         12
  Risks Relating to the Merger........................................................         12
  Risks Relating to Both Protocol and Pryon...........................................         12
ANNUAL MEETING OF PROTOCOL SHAREHOLDERS...............................................         15
  General.............................................................................         15
  Matters to be Considered at the Meeting.............................................         15
  Record Date; Shares Entitled to Vote; Vote Required.................................         15
  Proxies; Proxy Solicitation.........................................................         16
SPECIAL MEETING OF PRYON SHAREHOLDERS.................................................         17
  General.............................................................................         17
  Matters to be Considered at the Meeting.............................................         17
  Record Date; Shares Entitled to Vote; Vote Required.................................         17
  Proxies; Proxy Solicitation.........................................................         18
BACKGROUND OF AND REASONS FOR THE MERGER..............................................         19
  Background..........................................................................         19
  Joint Reasons for the Merger........................................................         20
  Protocol's Reasons for the Merger...................................................         20
  Pryon's Reasons for the Merger......................................................         21
  Recommendation of Protocol Board....................................................         22
  Opinion of Protocol Financial Advisor...............................................         22
  Recommendation of Pryon Board.......................................................         26
  Advice of Pryon's Financial Advisor.................................................         26
THE MERGER............................................................................         29
  Terms of the Merger.................................................................         29
  Effective Time of the Merger........................................................         31
  Exchange of Pryon Stock.............................................................         31
  Escrow of Protocol Common Stock.....................................................         31
  Quotation of Protocol Common Stock on Nasdaq National Market........................         32
  Representations and Warranties......................................................         32
  Business of Pryon Pending the Merger................................................         33
  Certain Covenants of Protocol.......................................................         34
  Voting Agreements...................................................................         34
  No Solicitation.....................................................................         34
  Conditions; Waivers.................................................................         34
  Termination; Amendment..............................................................         36
  Indemnification Agreements..........................................................         37
</TABLE>
 
                                     (iii)
<PAGE>
<TABLE>
<S>                                                                                     <C>
  Certain Federal Income Tax Considerations...........................................         37
  Resale of Protocol Common Stock Issued in the Merger; Affiliates....................         39
  Accounting Treatment................................................................         39
  Management and Operations of Pryon After the Merger.................................         39
  Expenses and Fees...................................................................         39
  Rights of Dissenting Pryon Shareholders.............................................         40
CONFLICTS OF INTEREST.................................................................         41
UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS...........................         43
BUSINESS OF PROTOCOL..................................................................         49
BUSINESS OF PRYON.....................................................................         49
  General.............................................................................         49
  Industry............................................................................         49
  Products............................................................................         50
  Strategy............................................................................         50
  Customer Support and Service........................................................         51
  Marketing and Customers.............................................................         51
  Manufacturing.......................................................................         52
  Research and Development............................................................         52
  Facilities..........................................................................         52
  Employees...........................................................................         52
SELECTED PRYON FINANCIAL DATA.........................................................         53
PRYON MANAGEMENT'S DISCUSSION AND ANALYSIS............................................         54
PROTOCOL MANAGEMENT...................................................................         58
PROTOCOL EXECUTIVE COMPENSATION.......................................................         59
STOCK OWNED BY PROTOCOL MANAGEMENT AND PRINCIPAL SHAREHOLDERS.........................         64
PRYON MANAGEMENT......................................................................         66
  Executive Officers..................................................................         66
  Directors...........................................................................         66
PRYON EXECUTIVE COMPENSATION..........................................................         67
  Summary of Cash and Certain Other Compensation......................................         67
CERTAIN TRANSACTIONS AND RELATIONSHIPS WITH PRYON.....................................         68
STOCK OWNED BY PRYON MANAGEMENT AND PRINCIPAL SHAREHOLDERS............................         69
ELECTION OF PROTOCOL DIRECTORS........................................................         71
APPROVAL OF AMENDMENT TO PROTOCOL 1992 STOCK INCENTIVE PLAN...........................         73
APPROVAL OF AMENDMENTS TO PROTOCOL 1993 STOCK OPTION PLAN FOR NONEMPLOYEE DIRECTORS...         75
RATIFICATION OF APPOINTMENT OF PROTOCOL INDEPENDENT AUDITORS..........................         77
DESCRIPTION OF PROTOCOL CAPITAL STOCK.................................................         78
  Common Stock........................................................................         78
  Preferred Stock.....................................................................         78
  Oregon Control Share and Business Combination Statutes..............................         79
  Shareholder Rights Plan.............................................................         79
  Transfer Agent......................................................................         81
COMPARATIVE RIGHTS OF PRYON SHAREHOLDERS AND PROTOCOL SHAREHOLDERS....................         81
  Classes of Stock....................................................................         81
</TABLE>
 
                                      (iv)
<PAGE>
<TABLE>
<S>                                                                                     <C>
  Amendments To Articles of Incorporation and Bylaws..................................         83
  Shareholder Power To Call Special Shareholders' Meeting.............................         84
  Approval of Certain Corporate Transactions..........................................         84
  Dissenters' Rights..................................................................         85
  Anti-Takeover Provisions............................................................         85
  "Blank Check" Preferred Stock.......................................................         87
  Removal of Directors................................................................         87
  Classified Board of Directors.......................................................         87
  Size of Board of Directors..........................................................         87
  Dividends and Repurchase of Shares..................................................         88
  Class Voting........................................................................         88
LEGAL OPINION.........................................................................         88
DATE FOR SUBMISSION OF SHAREHOLDER PROPOSALS..........................................         89
EXPERTS...............................................................................         89
FINANCIAL STATEMENTS..................................................................        F-1
Appendix A -- Agreement and Plan of Merger............................................        A-1
Appendix B -- Fairness Opinion of Wessels, Arnold & Henderson, L.L.C..................        B-1
Appendix C -- Wisconsin Dissenters' Rights Provisions.................................        C-1
</TABLE>
 
                                      (v)
<PAGE>
                                    SUMMARY
 
    CERTAIN    SIGNIFICANT    MATTERS    DISCUSSED   IN    THIS    JOINT   PROXY
STATEMENT/PROSPECTUS ARE SUMMARIZED BELOW.  THIS SUMMARY IS  NOT INTENDED TO  BE
COMPLETE  AND IS  QUALIFIED IN  ALL RESPECTS BY  REFERENCE TO  THE MORE DETAILED
INFORMATION  APPEARING  OR  INCORPORATED  BY  REFERENCE  IN  THIS  JOINT   PROXY
STATEMENT/ PROSPECTUS (INCLUDING THE APPENDICES HERETO).
 
GENERAL
 
    This  Joint Proxy Statement/Prospectus  relates to the  proposed merger (the
"Merger") of Protocol Merger Corporation ("Merger Sub"), a newly formed,  wholly
owned  subsidiary of Protocol Systems, Inc., an Oregon corporation ("Protocol"),
with and into Pryon Corporation,  a Wisconsin corporation ("Pryon"). Subject  to
the  approval of the Merger by the  shareholders of Pryon at the Special Meeting
of Pryon shareholders scheduled to be held  on July 8, 1996 (the "Pryon  Special
Meeting"),  the approval of the  issuance of shares of  Protocol Common Stock to
Pryon shareholders in the Merger by  the shareholders of Protocol at the  Annual
Meeting  of Protocol  shareholders scheduled  to be held  on July  10, 1996 (the
"Protocol Annual Meeting") and the satisfaction of certain other conditions, the
Merger will be effected pursuant to the terms of an Agreement and Plan of Merger
dated as of February 20, 1996 (the "Merger Agreement") among Pryon, Protocol and
Merger Sub, a copy of which is attached hereto as Appendix A and is incorporated
herein by reference.
 
THE COMPANIES
 
    PROTOCOL SYSTEMS, INC.  Protocol  designs, manufactures and markets  patient
monitoring   instruments  and  systems  utilizing  innovative  design,  advanced
software concepts  and leading  electronic technology.  Protocol's products  are
designed to address hospitals' needs for more efficient and flexible utilization
of  patient monitoring  equipment. Protocol's  Propaq monitors  combine multiple
physiologic measurement  and  display  capabilities into  a  single  lightweight
instrument, permitting the use of the monitor in a variety of hospital settings.
Propaq  monitors are  available in a  variety of configurations  and can measure
ECG; blood pressure, both invasively  and non-invasively; arterial blood  oxygen
saturation  level  (pulse  oximetry);  end-tidal  CO(2)  ("CO(2)");  respiration
(impedance pneumography); and body temperature.  The Propaq monitor can also  be
configured  to receive  wireless communication  of ECG  signals from  a portable
transmitter. Protocol's Acuity System  further increases monitoring  flexibility
by  allowing a clinician to observe and control  up to 32 Propaq monitors from a
dedicated UNIX-based workstation.  The mailing address  of Protocol's  principal
executive  offices is 8500 S.W. Creekside Place, Beaverton, Oregon 97008 and its
telephone number is (503) 526-8500. See "BUSINESS OF PROTOCOL."
 
    PROTOCOL MERGER  CORPORATION.   Merger  Sub, a  wholly owned  subsidiary  of
Protocol, was formed by Protocol solely for the purpose of effecting the Merger.
The  mailing address of Merger Sub's principal executive offices is c/o Protocol
Systems, Inc.,  8500  S.W. Creekside  Place,  Beaverton, Oregon  97008  and  its
telephone number is (503) 526-8500.
 
    PRYON  CORPORATION.  Pryon is a leading supplier of capnography products for
medical  instrumentation  manufacturers.  Capnography  is  the  measurement  and
graphical display of carbon dioxide concentration, or partial pressure appearing
at  a patient's airway. Pryon designs,  manufactures and markets both mainstream
and sidestream sensors and instrumentation  to monitor end-tidal carbon  dioxide
levels present in the respired breath of critically ill and other patients. This
CO(2)  data,  coupled  with  other  clinical  signs  and  information,  provides
clinicians with  a  noninvasive  means  to  assess  the  patient's  ventilation,
perfusion and circulatory status. In addition, Pryon has expanded its mission in
the  medical market  to provide  complete airway  monitoring systems,  using its
market presence in CO(2) monitoring as leverage. The mailing address of Pryon is
N93 W14575 Whittaker Way,  Menomonee Falls, Wisconsin  53051, and its  telephone
number is (414) 253-2770. See "BUSINESS OF PRYON."
 
MEETINGS OF SHAREHOLDERS
 
    PROTOCOL  ANNUAL MEETING.   The Protocol  Annual Meeting is  scheduled to be
held on July 10, 1996 at 10:00  a.m., local time, at Protocol's offices at  8500
S.W. Creekside Place, Beaverton, Oregon 97008.
 
                                       1
<PAGE>
At  the Protocol Annual Meeting, shareholders of Protocol will consider and vote
upon (i)  the issuance  of Protocol  Common Stock  in exchange  for all  of  the
outstanding  shares of capital stock of Pryon,  and upon the exercise of options
to  be  issued  by  Protocol  in  exchange  for  currently  outstanding  options
exercisable  for shares  of Pryon  Common Stock,  in connection  with the Merger
Agreement (the "Issuance"); (ii) the election  of two directors to the  Protocol
Board,  each to  hold office for  a three-year  term; (iii) an  amendment to the
Protocol 1992 Stock Incentive Plan  (the "Protocol 1992 Plan"); (iv)  amendments
to  the Protocol 1993 Stock Option Plan for Nonemployee Directors (the "Protocol
1993 Plan"); (v) ratification of the appointment of KPMG Peat Marwick LLP as the
Company's independent auditors for the fiscal year ending December 31, 1996  and
(vi)  such other business as may be  properly brought before the Protocol Annual
Meeting.
 
    Only holders of record of Protocol Common Stock at the close of business  on
May  6, 1996,  are entitled  to notice  of and  to vote  at the  Protocol Annual
Meeting.  On  that  date,  7,443,223  shares  of  Protocol  Common  Stock   were
outstanding  and entitled  to vote.  The affirmative  vote of  the holders  of a
majority of the  votes cast  on the  proposal is  required for  approval of  the
Issuance.  The affirmative vote of the holders  of a majority of the outstanding
shares of Protocol Common Stock is required to amend the Protocol 1992 Plan. The
affirmative vote of the holders of a  majority of the shares of Protocol  Common
Stock  present in person or by proxy  at the Protocol Annual Meeting is required
to amend the Protocol  1993 Plan. A  plurality of the votes  cast by the  shares
entitled  to vote  is required  for the election  of each  director. See "ANNUAL
MEETING OF PROTOCOL SHAREHOLDERS."
 
    PRYON SPECIAL MEETING.  The Pryon Special Meeting is scheduled to be held on
July 8,  1996 at  10:00  a.m., local  time, at  Pryon's  offices at  N93  W14575
Whittaker  Way,  Menomonee  Falls,  Wisconsin  53051.  At  the  Special Meeting,
shareholders of Pryon  will consider  and vote upon  a proposal  to approve  and
adopt the Merger Agreement and the Merger.
 
    Only  holders of  record of  Pryon common  stock, par  value $.10  per share
("Pryon Common Stock"),  holders of Pryon  Series A Preferred  Stock, par  value
$.10  per share ("Pryon Series A Preferred Stock") and holders of Pryon Series B
Preferred Stock, par value $.10 per share ("Pryon Series B Preferred Stock")  at
the  close of business on June 3, 1996, are entitled to notice of and to vote at
the Pryon Special Meeting.  On that date, 75,408  shares of Pryon Common  Stock,
58,505  shares of  Pryon Series  A Preferred  Stock and  80,599 shares  of Pryon
Series B Preferred Stock were outstanding and entitled to vote. The Pryon Common
Stock, Pryon Series  A Preferred Stock  and Pryon Series  B Preferred Stock  are
collectively  referred to as the "Pryon  Stock." The affirmative vote of holders
of shares representing (i)  a majority of  the number of  shares of Pryon  Stock
outstanding  and (ii) 66  2/3% of the sum  of the number of  shares of (A) Pryon
Series A Preferred Stock and (B)  Pryon Series B Preferred Stock  (collectively,
the  "Pryon Preferred Stock") outstanding is  necessary to approve and adopt the
Merger Agreement and the Merger. It is a condition to consummation of the Merger
that holders of not more than 5% of  the total number of shares of Pryon  Common
Stock  that would  be outstanding  if all outstanding  shares of  Pryon Series A
Preferred Stock and  Pryon Series B  Preferred Stock were  converted into  Pryon
Common  Stock exercise  dissenters' rights.  See "SPECIAL  MEETING OF  THE PRYON
SHAREHOLDERS."
 
THE MERGER
 
    GENERAL.  Upon consummation of the Merger, Merger Sub will merge into Pryon,
Pryon will become a wholly owned subsidiary of Protocol, and the shares of Pryon
Stock then outstanding (other  than shares as to  which dissenters' rights  have
been  exercised), and the options to purchase shares of Pryon Common Stock which
are then outstanding under Pryon's 1991 Stock Option Plan and Pryon's 1994 Stock
Option Plan (the "Pryon Employee Stock Options") will be converted as  described
below.
 
    EFFECTIVE  TIME OF THE MERGER.   Following receipt of all required approvals
and satisfaction or  waiver of the  other conditions to  the Merger, the  Merger
will  be consummated and become effective at  the time (the "Effective Time") at
which  the  articles  of   merger  to  be  filed   pursuant  to  the   Wisconsin
 
                                       2
<PAGE>
Business  Corporation Law (the "WBCL") are  received for filing by the Secretary
of State of Wisconsin or  such later date and time  as may be specified in  such
articles  of  merger. See  "THE  MERGER --  Effective  Time of  the  Merger" and
"Conditions; Waivers."
 
    CONVERSION OF PRYON STOCK IN THE  MERGER.  Upon consummation of the  Merger,
all  shares  of Pryon  Stock  issued and  outstanding  immediately prior  to the
Effective Time (other than  shares as to which  dissenters' rights of  appraisal
have  been duly  sought, perfected and  are not subsequently  withdrawn) and all
shares of Pryon  Common Stock  issuable upon  exercise of  Pryon Employee  Stock
Options will, collectively, be exchanged for 2,320,843 shares of Protocol Common
Stock (the "Aggregate Merger Consideration") (subject to adjustment as described
below),  to be allocated among the shares  of Pryon Common Stock, Pryon Series A
Preferred Stock, Pryon Series B Preferred Stock and Pryon Employee Stock Options
in accordance with  the rights  of each  such class or  series as  set forth  in
Pryon's  Articles of  Incorporation. If  the Protocol  Market Value  (as defined
below) equals or exceeds  $12.45, each share of  Pryon Preferred Stock and  each
share  of Pryon Common Stock will be exchanged  for the same number of shares of
Protocol Common Stock. The Merger  Agreement provides that the Aggregate  Merger
Consideration  will be adjusted if the  Protocol Market Value (as defined below)
is less than $10.643 per share or greater than $13.486 per share. The  "Protocol
Market  Value" will be  the average of  the per share  closing price of Protocol
Common Stock  on the  Nasdaq National  Market for  the thirty  (30)  consecutive
trading  days ending on June 14, 1996. If the Protocol Market Value is less than
$10.643, the Aggregate Merger Consideration will be increased to that number  of
shares  of  Protocol Common  Stock  which is  equal  to the  number  obtained by
dividing $24,700,000 by the Protocol Market Value. If the Protocol Market  Value
is  more than $13.486,  the Aggregate Merger Consideration  will be decreased to
that number of  shares of Protocol  Common Stock  which is equal  to the  number
obtained by dividing $31,300,000 by the Protocol Market Value.
 
    The  following table shows,  at various assumed  Protocol Market Values, the
total number  of shares  of Protocol  Common  Stock that  would be  issued  upon
consummation of the Merger and the number of such shares that would be issued in
respect  of each share of (i) Pryon  Common Stock, (ii) Pryon Series A Preferred
Stock and (iii) Pryon Series B Preferred Stock.
 
<TABLE>
<CAPTION>
                                                          NUMBER OF SHARES OF PROTOCOL COMMON STOCK
                                                                             TO
                                       TOTAL NUMBER OF   BE ISSUED IN RESPECT OF ONE SHARE OF PRYON
                    MARKET VALUE OF       SHARES OF      -------------------------------------------
ASSUMED PROTOCOL   AGGREGATE MERGER    PROTOCOL COMMON                       SERIES A     SERIES B
MARKET VALUE PER     CONSIDERATION       STOCK TO BE                         PREFERRED    PREFERRED
      SHARE          (IN MILLIONS)       ISSUED (1)        COMMON STOCK        STOCK        STOCK
- -----------------  -----------------  -----------------  -----------------  -----------  -----------
<S>                <C>                <C>                <C>                <C>          <C>
    $   10.00          $    24.7            2,470,000             9.07           10.33        12.25
        10.65               24.7            2,320,843             8.52            9.71        11.50
        12.46               28.9            2,320,843             9.83            9.83         9.83
        13.48               31.3            2,320,843             9.83            9.83         9.83
        14.00               31.3            2,235,714             9.47            9.47         9.47
        15.00               31.3            2,086,667             8.84            8.84         8.84
        16.00               31.3            1,956,250             8.29            8.29         8.29
        17.00               31.3            1,841,176             7.80            7.80         7.80
        18.00               31.3            1,738,889             7.37            7.37         7.37
        19.00               31.3            1,647,368             6.98            6.98         6.98
        20.00               31.3            1,565,000             6.63            6.63         6.63
        21.00               31.3            1,490,476             6.32            6.32         6.32
        22.00               31.3            1,422,727             6.03            6.03         6.03
        23.00               31.3            1,360,870             5.77            5.77         5.77
        24.00               31.3            1,304,167             5.53            5.53         5.53
        25.00               31.3            1,252,000             5.30            5.30         5.30
        26.00               31.3            1,203,846             5.10            5.10         5.10
        27.00               31.3            1,159,259             4.91            4.91         4.91
        28.00               31.3            1,117,857             4.74            4.74         4.74
</TABLE>
 
- ------------------------
(1) Includes shares  of Protocol  Common Stock  to be  issued upon  exercise  of
    Replacement Options.
 
                                       3
<PAGE>
    The  closing price of Protocol Common Stock  was $24.88 on May 31, 1996. The
average closing price of Protocol Common  Stock for the thirty (30)  consecutive
trading  days ending on May 31, 1996 was  $21.14, which, if used as the Protocol
Market Value, would  result in the  issuance of 6.27  shares of Protocol  Common
Stock in exchange for each share of Pryon Stock upon consummation of the Merger.
Assuming  a Protocol Market Value of  $21.14, a total of approximately 1,345,886
shares of  Protocol  Common  Stock  and  Replacement  Options  for  a  total  of
approximately  134,895  shares of  Protocol Common  Stock  would be  issued upon
consummation of  the Merger.  The Protocol  Common  Stock to  be issued  in  the
Merger,  including Protocol Common  Stock issuable upon  exercise of Replacement
Options, would  represent approximately  16% of  the shares  of Protocol  Common
Stock  outstanding after  the Merger, assuming  a Protocol  Market Value $21.14.
Because the number of shares of Protocol Common Stock to be issued in the Merger
is subject to adjustment if the Protocol  Market Value is less than $10.643  per
share  or greater than  $13.486 per share,  fluctuations in the  market price of
Protocol Common Stock during the thirty consecutive trading days ending on  June
14, 1996 will impact the number of shares of Protocol Common Stock issued in the
Merger  in exchange for  each share of Pryon  Stock. At any  time after June 14,
1996, shareholders of Protocol and Pryon may obtain information as to the actual
Protocol Market Value by calling Protocol at (503) 526-8500. The market value of
Protocol Common Stock  that the  Pryon shareholders ultimately  receive will  be
subject  to fluctuations in the market price  of Protocol Common Stock and could
be more  or  less  than its  market  value  on  the date  of  this  Joint  Proxy
Statement/Prospectus  or more or  less than the  Protocol Market Value. Protocol
and Pryon  shareholders are  advised  to obtain  current market  quotations  for
Protocol  Common Stock.  No assurance  can be  given as  to the  market price of
Protocol Common Stock at any time before the Effective Time or as to the  market
price  of Protocol Common Stock  at any time thereafter.  If the actual Protocol
Market Value is less than  $20.00 or more than  $26.00, Protocol and Pryon  will
recirculate  a supplement  to this  Joint Proxy  Statement/Prospectus containing
information as  to the  actual Protocol  Market Value  and the  shareholders  of
Protocol and Pryon will be given an opportunity to change their votes.
 
    CONVERSION OF PRYON EMPLOYEE STOCK OPTIONS IN THE MERGER.  Upon consummation
of  the Merger, each Pryon Employee Stock Option that is outstanding immediately
prior to the  Effective Time will  be converted into  an option (a  "Replacement
Option")  to purchase the number of shares  of Protocol Common Stock (rounded up
or down to the nearest  whole share) equal to the  product of (i) the number  of
shares of Pryon Common Stock which the option holder would have been entitled to
receive  had  such holder  exercised  the Pryon  Employee  Stock Option  in full
immediately prior to the consummation of  the Merger (whether or not such  Pryon
Employee  Stock Options would then have been exercisable) and (ii) the number of
shares of Protocol Common Stock  for which each share  of Pryon Common Stock  is
exchanged in the Merger (the "Exchange Ratio"). The per share exercise price for
a  Replacement Option  will be  equal to the  aggregate exercise  price for such
replaced Pryon Employee  Stock Option divided  by the number  of full shares  of
Protocol  Common Stock  deemed to  be purchasable  pursuant to  such Replacement
Option. At  or  after the  Effective  Time, option  agreements  for  Replacement
Options  will  be issued  pursuant to  Protocol's 1992  Stock Incentive  Plan to
holders of Pryon  Employee Stock  Options. Replacement Options  will have  terms
which  are  substantially identical  to the  terms of  the Pryon  Employee Stock
Options they replace.
 
    FRACTIONAL SHARES.  No  fractional shares of Protocol  Common Stock will  be
issued  in the Merger. Any  fractional amount resulting from  the Merger will be
rounded up or down to the nearest full share of Protocol Common Stock.
 
    RECOMMENDATION OF  PROTOCOL BOARD  OF  DIRECTORS.   The Protocol  Board  has
determined  the Issuance and the Merger to be  fair to and in the best interests
of Protocol and its  shareholders and has approved  the Issuance and the  Merger
Agreement. The Protocol Board recommends that Protocol shareholders vote FOR the
Issuance  and  the amendment  of the  Protocol 1992  Plan. The  Protocol Board's
recommendations are based upon a number of factors discussed in this Joint Proxy
Statement/Prospectus. See  "BACKGROUND  OF  AND REASONS  FOR  THE  MERGER,"  and
"APPROVAL OF AMENDMENT TO PROTOCOL 1992 STOCK INCENTIVE PLAN".
 
                                       4
<PAGE>
    OPINION  OF PROTOCOL FINANCIAL ADVISOR.  Wessels, Arnold & Henderson, L.L.C.
("Wessels") has been  retained by Protocol  to act as  its financial advisor  in
connection  with  the Merger.  Wessels  has delivered  its  oral opinion  to the
Protocol Board of Directors dated February 16, 1996 (as confirmed in writing  on
February  20, 1996, the "Wessels Opinion"), to  the effect that, as of such date
and based on the procedures followed, factors considered and assumptions made by
Wessels as set forth therein, the consideration to be paid to holders of capital
stock of Pryon pursuant to the Merger  Agreement is fair from a financial  point
of  view to  Protocol. The full  text of  the Wessels Opinion,  which sets forth
assumptions made, matters considered and  limitations on the review  undertaken,
is  attached hereto as Appendix  B. Protocol shareholders are  urged to read the
opinion carefully and in its entirety.  The Wessels Opinion is directed only  to
the  fairness  to  Protocol  of  the  consideration  to  be  paid  to  the Pryon
shareholders pursuant to the Merger Agreement from a financial point of view and
should not  be deemed  to constitute  a recommendation  by Wessels  to  Protocol
shareholders  to  vote in  favor of  any  matter presented  in this  Joint Proxy
Statement/Prospectus. The summary  of the  Wessels Opinion set  forth herein  is
qualified  in its entirety  by reference to  the full text  of such opinion. See
"BACKGROUND OF  AND REASONS  FOR THE  MERGER --  Opinion of  Protocol  Financial
Advisor."
 
    RECOMMENDATION  OF PRYON BOARD OF DIRECTORS.  The Pryon Board has determined
the Merger to be fair to and in the best interests of Pryon and its shareholders
and has approved the Merger Agreement and the Merger. The Pryon Board recommends
that Pryon shareholders approve the Merger  Agreement and the Merger. The  Pryon
Board's  recommendations are  based upon a  number of factors  discussed in this
Joint Proxy Statement/Prospectus. See "BACKGROUND OF AND REASONS FOR THE MERGER"
and "CONFLICTS OF INTEREST."
 
    VOTING AGREEMENTS.   Certain Shareholders  of Pryon owning  an aggregate  of
189,629  shares of Pryon Stock representing 88.4% of all outstanding Pryon Stock
and also representing 79.2%, 86.6% and 98.3% of the outstanding shares of  Pryon
Common Stock, Pryon Series A Preferred Stock and Pryon Series B Preferred Stock,
respectively,  have entered into an agreement with Protocol to vote all of their
shares of Pryon Stock for approval of  the Merger and the Merger Agreement.  See
"THE MERGER -- Voting Agreements."
 
    EXCHANGE  OF PRYON STOCK  IN THE MERGER.   As soon  as practicable after the
Effective Time, the Exchange  Agent for the Merger  (the "Exchange Agent")  will
deliver to each holder of certificates representing shares of Pryon Stock (other
than  dissenting shares), a  form of letter of  transmittal and instructions for
use in effecting the surrender of  such certificates for conversion into  shares
of  Protocol Common Stock.  Upon surrender of such  certificates to the Exchange
Agent, together with  the letter  of transmittal and  other required  documents,
each  such holder will receive for each share of Pryon Stock represented by such
certificate the number of shares of  Protocol Common Stock into which shares  of
Pryon  Stock were converted in  the Merger, less the  number of shares delivered
pursuant to the Escrow Agreement.  See "THE MERGER --  Terms of the Merger"  and
"Exchange of Pryon Common Stock."
 
    ESCROW  OF  PROTOCOL  COMMON  STOCK.   The  Merger  Agreement  provides that
Protocol will withhold, on a pro rata basis, ten percent (10%) of the shares  of
Protocol  Common  Stock  to be  received  by  each holder  of  Pryon  Stock upon
consummation of the  Merger (the  "Escrow Shares").  The Escrow  Shares will  be
delivered to First Interstate Bank of Oregon, N.A., as escrow agent (the "Escrow
Agent").  The Escrow Shares will be held by the Escrow Agent for a period ending
on the first anniversary of the Closing Date. Subject to certain limitations set
forth in the Merger Agreement,  the Escrow Shares will  be subject to claims  by
Protocol  to satisfy Pryon's obligations under the Merger Agreement to reimburse
Protocol for  any  and all  losses,  damages, liabilities,  costs  and  expenses
incurred  by Protocol by  reason of, arising  out of, or  in connection with any
breach or inaccuracy of any representation or warranty of Pryon contained in the
Merger Agreement or the  failure by Pryon to  perform any agreement or  covenant
required  of Pryon  under the  Merger Agreement.  See "THE  MERGER --  Escrow of
Protocol Common Stock."
 
                                       5
<PAGE>
    QUOTATION OF PROTOCOL COMMON STOCK ON THE NASDAQ NATIONAL MARKET.   Protocol
has  agreed to use all reasonable efforts  to cause the Protocol Common Stock to
be issued pursuant to the Merger  Agreement and upon exercise of Pryon  Employee
Stock  Options to be quoted for trading  on the Nasdaq National Market. See "THE
MERGER -- Quotation of Protocol Common Stock on the Nasdaq National Market."
 
    BUSINESS OF PROTOCOL PENDING THE MERGER.  Protocol has agreed that, prior to
the Effective Time or earlier termination of the Merger Agreement, unless  Pryon
agrees  in  writing or  except  as otherwise  permitted  pursuant to  the Merger
Agreement, it will carry on its business consistent with past practices and will
not engage in certain actions specified in the Merger Agreement. See "THE MERGER
- -- Certain Covenants of Protocol."
 
    BUSINESS OF PRYON PENDING THE MERGER.   Pryon has agreed that, prior to  the
Effective  Time  or  earlier  termination of  the  Merger  Agreement,  except as
contemplated by the Merger Agreement,  it will conduct its operations  according
to  its ordinary course of business  consistent with past practice. In addition,
unless Protocol agrees in writing or  except as otherwise permitted pursuant  to
the  Merger Agreement, prior to the Effective  Time Pryon will not engage in any
of a number of  actions specified in  the Merger Agreement.  See "THE MERGER  --
Business of Pryon Pending the Merger."
 
    NO  SOLICITATION.   Pryon has  agreed that, prior  to the  Effective Time or
earlier termination  of  the  Merger  Agreement,  neither  it  nor  any  of  its
affiliates  will,  directly  or  indirectly,  encourage,  solicit  or  engage in
discussions  or  negotiations  with  any  third  party  concerning  any  merger,
consolidation,  share  exchange or  similar transaction  involving Pryon  or any
purchase of all or a significant portion of the assets of or equity interest  in
Pryon,  or any  other transaction that  would involve the  transfer or potential
transfer of control of Pryon. See "THE MERGER -- No Solicitation."
 
    MANAGEMENT AND OPERATIONS  OF PRYON  AFTER THE  MERGER.   After the  Merger,
Pryon  will be a wholly owned subsidiary  of Protocol. Pryon will operate as one
of Protocol's business units, and Protocol currently intends to maintain Pryon's
corporate headquarters in  Menomonee Falls, Wisconsin.  After the Merger,  Pryon
will  have access to resources generally  available to Protocol's other business
units, will participate in appropriate  activities with other Protocol  business
units  and will  be managed  by its  current officers,  under the  direction and
guidance of Protocol's senior management and the Protocol and Pryon Boards.  See
"THE MERGER -- Management and Operations of Pryon After the Merger."
 
    CONDITIONS  OF THE MERGER;  TERMINATION.  The consummation  of the Merger is
conditioned upon the fulfillment  or waiver of certain  conditions set forth  in
the  Merger  Agreement.  See "THE  MERGER  -- Conditions;  Waivers."  The Merger
Agreement may be terminated (i) by mutual consent of Protocol and Pryon, (ii) by
either Protocol or  Pryon if the  Merger has  not been consummated  by July  12,
1996, and (iii) under certain other circumstances. See "THE MERGER -- Amendment;
Termination."
 
    CERTAIN  FEDERAL INCOME  TAX CONSEQUENCES.   It is expected  that the Merger
will  constitute  a  reorganization  for   federal  income  tax  purposes   and,
accordingly,  that no gain or loss will  be recognized by holders of Pryon Stock
upon the conversion of Pryon Stock into Protocol Common Stock in the Merger.  It
is further expected that no gain or loss will be recognized by Pryon or Protocol
as  a  result of  the  Merger. See  "THE MERGER  --  Certain Federal  Income Tax
Consequences." Pryon shareholders are urged to consult their own tax advisor  as
to the specific tax consequences to them of the Merger.
 
    REGULATORY  APPROVALS.  The parties  to the Merger are  not required to file
notifications under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
amended, and  are  not aware  of  any  other regulatory  approvals  required  to
consummate the Merger other than compliance with the federal securities laws and
applicable securities and "blue sky" laws of the various states.
 
    ACCOUNTING  TREATMENT.  It is expected that the Merger will be accounted for
as a pooling of interests. See "THE MERGER -- Accounting Treatment."
 
                                       6
<PAGE>
    CONFLICTS OF INTEREST.  As of the Pryon Record Date, non-employee  directors
of  the Pryon Board beneficially  owned an aggregate of  116,797 shares of Pryon
Stock. Assuming  a  Protocol Market  Value  of $13.48  per  share or  more,  the
aggregate  dollar  value  of  Protocol  Common Stock  to  be  received  by these
non-employee directors in respect of outstanding shares of Pryon Stock would  be
approximately  $15,489,143,  representing approximately  49.5% of  the aggregate
consideration to be received  by all holders of  Pryon Stock and Pryon  Employee
Stock Options.
 
    As of the Record Date, the executive officers of Pryon beneficially owned an
aggregate  of 42,740 shares  of Pryon Stock  and held options  to acquire 13,100
shares of  Pryon  Common Stock,  which  options will  convert  into  Replacement
Options  to acquire Protocol Common Stock based  on the Exchange Ratio. See "THE
MERGER -- Terms of the Merger --  Conversion of Pryon Employee Stock Options  in
the  Merger"  and  "Interests of  Certain  Persons  in the  Merger."  Assuming a
Protocol Market Value of $13.48 per share or more, the aggregate dollar value of
Protocol Common Stock to be received  by these executive officers in respect  of
outstanding   shares  of   Pryon  Stock   would  be   approximately  $5,668,179,
representing approximately 18.1% of the  aggregate consideration to be  received
by  all holders  of Pryon  Stock and  Pryon Employee  Stock Options.  Assuming a
Protocol Market Value of $13.48 per share or more, the aggregate dollar value of
Protocol Common Stock issuable  upon the exercise of  Replacement Options to  be
received by the executive officers would be approximately $1,737,322.
 
    Pryon  is indebted to each of Daniel  F. Carsten, Robert H. Ricciardelli and
Robert M. Sommer, which  indebtedness is evidenced by  a Pryon Promissory  Note,
each  dated July 1,  1995, and each  in the principal  amount of $75,429.00 (the
"Promissory Notes"),  plus any  accrued and  unpaid interest.  The  indebtedness
evidenced  by the  Promissory Notes  is subordinate  to certain  indebtedness of
Pryon to its senior bank lender. Pursuant to the Merger Agreement, Protocol  has
committed  at or within ten days after the Closing to cause Pryon to pay in full
each of the Promissory Notes.
 
    DISSENTERS' RIGHTS.  Holders of Pryon Common Stock have the right to dissent
from the proposed Merger and, subject to certain conditions, to receive  payment
of  the  "fair value"  of their  shares of  Pryon Common  Stock, as  provided in
Sections 180.1301 through  180.1331 of  the WBCL.  A shareholder  who elects  to
exercise his or her dissenters' rights must perfect such rights by delivering to
Pryon  prior to  the vote at  the Special Meeting  written notice of  his or her
intent to demand payment, and not vote his or her shares in favor of the  Merger
Agreement,  by  either  voting  against  adoption  of  the  Merger  Agreement or
abstaining  from  voting.  See  "THE  MERGER  --  Rights  of  Dissenting   Pryon
Shareholders."
 
RISK FACTORS
 
    The  shareholders  of  Protocol  and  Pryon  should  consider  carefully the
information set forth herein under  the heading "Risk Factors" which  discusses,
among other things, the risks associated with: the integration of the businesses
of  Protocol and Pryon following the Merger; expenses related to the Merger; the
effect of future  sales of the  shares issued in  the Merger on  the market  for
Protocol  Common Stock;  the termination of  Pryon customers in  response to the
Merger; the transition of sales responsibilities from Pryon distributors to  the
Protocol  direct sales force; fluctuations in  operating results of Protocol and
Pryon;  OEM  sales;  competition  and  changes  in  technology;  dependence   on
suppliers; cost containment programs in the health care industry; product defect
and  liability  matters;  government regulation;  dependence  on  key personnel;
protection  of  intellectual  property;  and  certain  antitakeover   protective
measures adopted by Protocol.
 
                                       7
<PAGE>
                       SELECTED HISTORICAL AND UNAUDITED
                  PRO FORMA COMBINED CONDENSED FINANCIAL DATA
 
    The  following  selected historical  financial  information of  Protocol and
Pryon has been derived from  their respective historical consolidated  financial
statements, and should be read in conjunction with such financial statements and
the notes thereto. Protocol's financial statements are incorporated by reference
in  this Joint Proxy Statement/Prospectus. Pryon's  audited Balance Sheets as of
December 31, 1995 and 1994, its  audited Statements of Operations for the  years
1995,  1994 and 1993, its  unaudited Balance Sheet as of  March 31, 1996 and its
unaudited Statements of Operations for  the three-month periods ended March  31,
1996  and 1995 are included elsewhere  in this Joint Proxy Statement/Prospectus.
Pryon's other audited historical  financial statements for  1993, 1992 and  1991
are  not included  herein. The selected  unaudited pro  forma combined financial
information, which gives effect to the Merger on a pooling of interests basis as
if it had been consummated at the beginning of the periods presented, is derived
from the unaudited  pro forma combined  condensed financial statements  included
elsewhere   in  this  Joint  Proxy   Statement/Prospectus  and  should  read  in
conjunction with such statements and the notes thereto.
 
    The unaudited pro  forma combined financial  information is not  necessarily
indicative  of the  actual results  or financial  position that  would have been
achieved had  the  Merger  been  consummated  at  the  beginning  of  the  years
presented,  and should not be construed  as representative of future operations.
See "UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS."
 
                       PROTOCOL HISTORICAL FINANCIAL DATA
                    (in thousands, except per share amounts)
 
<TABLE>
<CAPTION>
                                                                                                       AT OR FOR THREE
                                                                                                      MONTHS ENDED MARCH
                                                        AT OR FOR YEAR ENDED DECEMBER 31,                    31,
                                              -----------------------------------------------------  --------------------
                                                1995       1994       1993       1992       1991       1996       1995
                                              ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                                                                         (UNAUDITED)
<S>                                           <C>        <C>        <C>        <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENT OF
  OPERATIONS DATA:
Sales.......................................  $  49,067  $  41,166  $  37,132  $  29,091  $  23,009  $  13,789  $  10,176
Income from operations......................      5,095      4,659      4,241      2,459      2,335      1,603        437
Income before extraordinary item and
 cumulative effect of change in accounting
 principle..................................      4,678      4,146      3,408      2,158      1,515      1,328        502
Net income..................................      4,678      4,146      3,508      2,201      2,231      1,328        502
Net income per common and common equivalent
 share before extraordinary item and
 cumulative effect of change in accounting
 principle..................................       0.61       0.56       0.46       0.31       0.26       0.17       0.07
Net income per common and common equivalent
 share......................................       0.61       0.56       0.47       0.32       0.39       0.17       0.07
Weighted average common and common
 equivalent shares outstanding..............      7,701      7,456      7,459      6,964      5,702      8,042      7,632
CONSOLIDATED BALANCE SHEET DATA:
Cash and investments........................  $  24,222  $  23,552  $  19,323  $  21,208  $   2,939  $  26,431  $  23,364
Working capital.............................     26,872     31,436     28,214     21,871      7,094     28,854     31,833
Total assets................................     49,880     41,839     37,272     31,920     12,491     51,429     42,014
Long-term debt excluding current
 maturities.................................          0          0          0        249        640          0          0
Shareholders' equity (1)....................     42,531     35,884     31,477     27,464      8,223     43,956     36,773
Book value per common and common equivalent
 share......................................       5.45       4.79       4.21       3.75       1.44       5.45       4.81
</TABLE>
 
                                       8
<PAGE>
                        PRYON HISTORICAL FINANCIAL DATA
 
<TABLE>
<CAPTION>
                    (in thousands, except per share amounts)
                                                                                                               AT OR FOR THREE
                                                                                                              MONTHS ENDED MARCH
                                                                AT OR FOR YEAR ENDED DECEMBER 31,                    31,
                                                      -----------------------------------------------------  --------------------
                                                        1995       1994       1993       1992       1991       1996       1995
                                                      ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                                                                                 (UNAUDITED)
<S>                                                   <C>        <C>        <C>        <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Sales...............................................  $  12,276  $   8,001  $   7,240  $   3,066  $   1,460  $   3,135  $   3,059
Income (loss) from operations.......................      1,013       (643)      (229)      (829)      (637)       255        371
Income (loss) before extraordinary item and
 cumulative effect of change in accounting
 principle..........................................        818       (794)      (264)      (855)      (621)       202        338
Net (loss) income...................................        818       (794)      (264)      (855)      (621)       202        338
Net income (loss) per common and common equivalent
 share before extraordinary item and cumulative
 effect of change in accounting principle...........       3.65     (10.55)     (3.51)    (11.20)     (7.85)      0.89       1.49
Net income (loss) per common and common equivalent
 share..............................................       3.65     (10.55)     (3.51)    (11.20)     (7.85)      0.89       1.49
Weighted average common and common equivalent shares
 outstanding (2)....................................        225         75         75         76         78        227        227
 
CONSOLIDATED BALANCE SHEET DATA
Cash and investments................................  $      45  $     167  $     143  $   1,674  $     665  $      10  $     101
Working capital.....................................      4,176      2,022      2,374      3,205        993      4,626      2,361
Total assets........................................      7,710      6,612      5,221      5,687      2,330      7,867      6,922
Long-term debt excluding current maturities.........      1,795        156        387        319        362      1,972        132
Redeemable preferred stock..........................      6,737      6,737      5,741      5,731      1,783      6,737      6,737
Shareholders' (deficit) equity (1)..................     (2,271)    (3,089)    (2,295)    (2,032)    (1,171)    (2,069)    (2,751)
Book value per common and common equivalent share
 (3)................................................     (30.11)    (40.98)    (30.53)    (27.10)    (15.05)    (27.44)    (36.50)
</TABLE>
 
    UNAUDITED PROTOCOL AND PRYON PRO FORMA COMBINED CONDENSED FINANCIAL DATA
                    (in thousands, except per share amounts)
 
<TABLE>
<CAPTION>
                                                                                                           AT OR FOR THREE
                                                                         AT OR FOR YEAR ENDED DECEMBER    MONTHS ENDED MARCH
                                                                                      31,                        31,
                                                                        -------------------------------  --------------------
                                                                          1995       1994       1993       1996       1995
                                                                        ---------  ---------  ---------  ---------  ---------
                                                                                                             (UNAUDITED)
<S>                                                                     <C>        <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Sales.................................................................  $  59,602  $  48,158  $  43,327  $  16,239  $  12,944
Income from operations................................................      6,010      4,098      3,823      1,881        781
Income before cumulative effect of change in accounting principle.....      5,398      3,434      2,954      1,553        813
Net income............................................................      5,398      3,434      3,054      1,553        813
Net income per common and common equivalent share before cumulative
 effect of change in accounting principle.............................       0.59       0.39       0.34       0.16       0.09
Net income per common and common equivalent share.....................       0.59       0.39       0.35       0.16       0.09
Weighted average common and common equivalent shares outstanding......      9,204      8,828      8,817      9,562      9,137
CONSOLIDATED BALANCE SHEET DATA
Cash and investments..................................................  $  24,267                        $  26,441
Working capital.......................................................     29,484                           31,939
Total assets..........................................................     57,460                           59,149
Long-term debt excluding current maturities...........................      1,795                            1,972
Shareholders' equity (1)..............................................     45,433                           47,083
Book value per common and common equivalent share.....................       4.87                             4.91
</TABLE>
 
- --------------------------
(1) No cash dividends were declared or  paid by either Protocol or Pryon  during
    any of the periods presented.
 
(2)  Common equivalent shares include dilutive weighted average preferred shares
    outstanding as if the preferred shares  had been converted to common  shares
    on  a  one-to-one basis,  as well  as dilutive  weighted average  options to
    purchase common  stock assumed  to  be outstanding  in accordance  with  the
    treasury   stock  method.  The  computation   of  common  equivalent  shares
    outstanding assumes that no options to  purchase Pryon common stock will  be
    exercised prior to the merger.
 
(3)  Book value per  share amounts are computed  by dividing total shareholders'
    equity  by  the  total  number  of  common  and  common  equivalent   shares
    outstanding  at the end of  the year. Preferred shares  are not included and
    other common stock equivalents are included only if dilutive.
 
                                       9
<PAGE>
                           COMPARATIVE PER SHARE DATA
 
    The following table  presents comparative  per share data  for Protocol  and
Pryon  on a  historical basis and  combined per  share data on  an unaudited pro
forma basis.  The combined  data gives  effect to  the Merger  on a  pooling  of
interests  basis  assuming  an  exchange ratio  resulting  in  6.4693  shares of
Protocol Common Stock being issued in exchange for each share of Pryon Stock  in
the  merger. The assumed exchange  ratio is based on  an assumed Protocol Market
Value of $20.50, which was the closing price of Protocol Common Stock on May 10,
1996. The number of shares of Protocol Common Stock that will actually be issued
upon consummation of the Merger is  subject to adjustment based on the  Protocol
Market  Value. See  "THE MERGER --  Terms of  the Merger --  Conversion of Pryon
Stock in the Merger." This data should be read in conjunction with the  selected
historical  financial information,  the pro  forma combined  condensed financial
statements and  the separate  historical financial  statements of  Protocol  and
Pryon  and the notes thereto incorporated  by reference or included elsewhere in
this  Joint  Proxy  Statement/Prospectus.  The  unaudited  pro  forma   combined
financial  data is not necessarily indicative of the actual results or financial
position that would have  been achieved had the  Merger been consummated at  the
beginning  of the years presented, and should not be construed as representative
of future operations.
 
<TABLE>
<CAPTION>
                                                                                                AT OR FOR THREE
                                                              AT OR FOR YEAR ENDED DECEMBER    MONTHS ENDED MARCH
                                                                           31,                        31,
                                                             -------------------------------  --------------------
                                                               1995       1994       1993       1996       1995
                                                             ---------  ---------  ---------  ---------  ---------
                                                                                                  (UNAUDITED)
<S>                                                          <C>        <C>        <C>        <C>        <C>
HISTORICAL -- PROTOCOL:
  Net income per share.....................................  $    0.61  $    0.56  $    0.47  $    0.17  $    0.07
  Book value per share (1).................................       5.45       4.79       4.21       5.45       4.81
 
HISTORICAL -- PRYON:
  Net income (loss) per share..............................       3.65     (10.55)     (3.51)      0.89       1.49
  Book value per share (1).................................     (30.11)    (40.98)    (30.53)    (27.44)    (36.50)
 
PRO FORMA -- COMBINED NET INCOME
  Net income per Protocol share............................       0.59       0.39       0.35       0.16       0.09
  Net income per Pryon share (2)...........................       3.79       2.52       2.24       1.04       0.58
 
PRO FORMA -- COMBINED BOOK VALUE
  Book value per Protocol share (3)(4).....................       4.87                             4.91
  Book value per Pryon share (2)...........................      31.52                            31.78
</TABLE>
 
- ------------------------
(1)  The  historical  book  value  per  share  is  computed  by  dividing  total
    shareholders'  equity  by  the  total  number  of  common  shares  and share
    equivalents outstanding at the end of the year.
 
(2) The Pryon  equivalent pro forma  amounts of  net income and  book value  are
    computed  by multiplying the pro forma combined amount per Protocol share by
    an assumed exchange ratio of 6.4693 shares of Protocol Common Stock for each
    share of Pryon  Stock. The number  of shares of  Protocol Common Stock  that
    will  actually  be issued  upon  consummation of  the  Merger is  subject to
    adjustment based on the Protocol Market  Value. See "THE MERGER -- Terms  of
    the Merger."
 
(3)  Protocol and Pryon estimate that they  will incur direct and indirect costs
    of $1.6 million in connection with the Merger, relating mainly to investment
    banker fees and legal and accounting services. These nonrecurring costs will
    be charged  to operations  in the  fiscal  quarter in  which the  merger  is
    consummated.  The pro forma combined book value per share data reflect these
    estimated transaction costs  and their  tax effects  as if  such costs  were
    incurred  as of December  31, 1995, but  the effects of  these costs are not
    reflected in the pro forma combined net income per share data.
 
(4) The pro  forma combined book  value per  share of Protocol  Common Stock  is
    computed  by dividing pro forma shareholders' equity by the pro forma number
    of common shares and share equivalents outstanding at the end of the period.
 
                                       10
<PAGE>
                    COMPARATIVE PER SHARE MARKET INFORMATION
 
PROTOCOL
 
    The Protocol Common Stock is quoted on the Nasdaq National Market. The table
below sets forth for the fiscal periods indicated the high and low sales  prices
per  share of Protocol Common Stock on the Nasdaq National Market as reported in
published financial sources.
 
<TABLE>
<CAPTION>
                                                                                          PRICE PER SHARE OF
                                                                                           PROTOCOL COMMON
                                                                                                STOCK
                                                                                         --------------------
                                                                                           HIGH        LOW
                                                                                         ---------  ---------
 
<S>                                                                                      <C>        <C>
FISCAL 1993
  First Quarter........................................................................  $    9.25  $    6.00
  Second Quarter.......................................................................       9.13       5.38
  Third Quarter........................................................................      10.75       8.00
  Fourth Quarter.......................................................................      11.75       8.88
 
FISCAL 1994
  First Quarter........................................................................      11.25       9.25
  Second Quarter.......................................................................      10.00       5.88
  Third Quarter........................................................................       9.50       6.00
  Fourth Quarter.......................................................................      10.25       7.75
 
FISCAL 1995
  First Quarter........................................................................      12.00       8.75
  Second Quarter.......................................................................      13.00       8.50
  Third Quarter........................................................................      11.88       9.25
  Fourth Quarter.......................................................................      11.50       9.88
 
FISCAL 1996
  First Quarter........................................................................      18.00      10.38
  Second Quarter (through May 31)......................................................      25.13      15.63
</TABLE>
 
    On February 20, 1996, the last full trading day prior to announcement of the
execution of the Merger Agreement,  the reported Nasdaq National Market  closing
price  per share of Protocol Common Stock was $13.625. On May 31, 1996, the most
recent available date prior to  printing this Joint Proxy  Statement/Prospectus,
the  reported Nasdaq National Market closing  price per share of Protocol Common
Stock was  $24.88.  On that  date,  there were  approximately  4,000  beneficial
holders  of Protocol Common Stock.  Protocol shareholders and Pryon shareholders
are urged to obtain current market quotations.
 
    Protocol has never paid cash dividends  on shares of Protocol Common  Stock.
It  is not anticipated that  any cash dividends will  be paid on Protocol Common
Stock in the foreseeable future.
 
PRYON
 
    There is no public market for shares  of Pryon Stock. There were 32  holders
of record of Pryon Common Stock as of June 3, 1996.
 
    Pryon  has never paid cash dividends on  shares of Pryon Common Stock. It is
not anticipated that any cash  dividends will be paid  on Pryon Common Stock  in
the foreseeable future. Pryon is restricted under its existing loan and security
agreement  from paying cash dividends or from making any other distribution with
respect to shares of its capital stock.
 
                                       11
<PAGE>
                                  RISK FACTORS
 
    The  following factors should be considered carefully by the shareholders of
Protocol Systems, Inc. and  Pryon Corporation in connection  with voting on  the
Issuance  and the Merger. These factors should be considered in conjunction with
the other information included or incorporated by reference in this Joint  Proxy
Statement/Prospectus.
 
RISKS RELATING TO THE MERGER
 
    INTEGRATION  OF THE BUSINESSES.  The  Merger involves the combination of two
companies  that  have  previously  operated  independently.  Although  Pryon  is
expected to be operated as a wholly owned subsidiary of Protocol, the transition
will  require  substantial  attention  from management  of  both  companies. The
difficulties involved in the management  and coordination of two  geographically
separate organizations, the integration of two companies' product offerings, and
the transfer of marketing and sales responsibilities for Pryon's direct products
could cause disruption of, or loss of momentum in, one or both of the companies'
businesses,  which  could  have a  material  adverse  effect on  the  results of
operations or financial condition of the companies.
 
    EXPENSES RELATED TO THE MERGER.  The Merger will result in aggregate pre-tax
expense to  Protocol  estimated  at  approximately  $1.6  million.  This  amount
includes  estimated costs of consummating the Merger, including fees and charges
of financial advisors, attorneys, and  accountants. These costs will  negatively
affect  Protocol's results of operations  in the quarter in  which the Merger is
consummated.
 
    SHARES ELIGIBLE  FOR  FUTURE  SALE.    If the  Merger  is  approved  by  the
shareholders  of Protocol and Pryon, Protocol  will issue to the shareholders of
Pryon 2,320,843 shares of  Protocol Common Stock, subject  to adjustment if  the
average  trading  price of  Protocol Common  Stock for  the thirty  trading days
ending on  June 14,  1996  is greater  than $13.486  or  less than  $10.643.  In
general,  these shares will be freely  tradable following the Merger, subject to
certain volume and other resale limitations for affiliates of Pryon or  Protocol
pursuant  to Rules 144 and/or  145 under the Securities  Act. See "THE MERGER --
Resale of Protocol Common Stock Issued in the Merger; Affiliates." Future  sales
of  a  substantial  number  of  such  shares  could  adversely  affect  or cause
substantial fluctuations in the market price of Protocol Common Stock.
 
    CUSTOMER TERMINATION.  The announcement and consummation of the Merger could
cause customers and potential customers of Pryon to seek an alternative original
equipment manufacturer ("OEM")  supplier for capnography  products due to  their
concern about being a competitor with Protocol. Since a customer terminating its
relationship  with Pryon would be required  to re-design and then re-certify its
instrumentation with  regulatory  authorities,  such termination's  may  not  be
immediate, but could occur over a period of several years. Customer terminations
or  the failure to attract new customers could have a material adverse effect on
the business,  financial condition  and results  of operations  of Protocol  and
Pryon.
 
    DISTRIBUTOR  TERMINATION.  Protocol  and Pryon intend  to transfer sales and
marketing responsibility for Pryon's  direct standalone instruments, the  SC-300
(combined  Mainstream and Sidestream  CO(2) monitor) and  the SC-210 (Sidestream
CO(2) monitor), to Protocol's direct sales force in the United States. In making
this transition, Pryon's current U.S.  distributors of these products have  been
terminated.  As  a  result of  this  transition,  sales of  these  devices could
decrease and  distributors could  return unsold  equipment and/or  demonstration
monitors,  both  events  which  could  have a  material  adverse  effect  on the
business, financial condition and results of operations of Protocol and Pryon. A
similar transition will be made with international distributors.
 
RISKS RELATING TO BOTH PROTOCOL AND PRYON
 
    FLUCTUATION  OF  OPERATING  RESULTS.    A  variety  of  factors  may   cause
period-to-period  fluctuations in  the operating  results of  Protocol and Pryon
following the  Merger.  Such  factors  include, but  are  not  limited  to,  the
integration  of  the  businesses  noted  above,  competitive  pricing pressures,
revenue and expenses related to new products or revisions to existing  products,
delays in regulatory approvals and
 
                                       12
<PAGE>
changes  in distribution channels or product mix, or changes in capital spending
practices of health  care providers due  to changes in  legislation or  industry
cost  reform. In addition, Protocol's customers  generally order on an as needed
basis and expect  product shipment within  30-45 days of  order placement. As  a
result,  Protocol does  not carry  a significant  backlog and  must commit  to a
production schedule before receiving the actual customer order. Singularly or in
combination, these factors can adversely affect the companies' operating results
and financial condition.
 
    ORIGINAL EQUIPMENT MANUFACTURER  CUSTOMERS.   Both Protocol  and Pryon  sell
products  to  OEM  customers,  i.e., companies  that  incorporate  components or
subassemblies manufactured  by  Protocol  or  Pryon  into  their  own  completed
products  or systems which are  then sold to the end  user under their label, or
sell completed products manufactured by Protocol or Pryon under their own label.
Selling into  OEM  distribution channels  involves  inherent risks  including  a
concentration  of sales in fewer customers; lack of visibility into the end user
markets being served; inability to control or forecast an OEM customer's  design
process,  priorities,  or time  to market;  and complete  dependence on  the OEM
customer's design, regulatory  approvals, marketing and  sales capabilities  and
success.  An OEM customer's  schedule, demand forecast,  inventory position, and
end user sales success can  change rapidly, often without adequate  forewarning,
and  could  have a  material  adverse effect  on  the business,  the  results of
operations or financial condition of the companies.
 
    COMPETITION AND  CHANGES IN  TECHNOLOGY.   The  medical device  industry  is
characterized  by rapidly  evolving technology  and increased  competition. Many
competitors  have  substantially  greater  financial,  technical  and  marketing
resources  than either Protocol or Pryon. There can be no assurance that some of
these competitors will not succeed in developing technologies and products  that
are  more effective than those  of Protocol or Pryon,  or that would render some
products offered by Protocol or  Pryon obsolete or non-competitive.  Competition
based  on  price  is expected  to  become  an increasingly  important  factor in
customer purchasing patterns as a result  of cost containment pressures on,  and
consolidation in, the health care industry. Such competition has exerted, and is
likely  to continue to exert, downward pressure on the prices Protocol and Pryon
are able to charge for their products.  There can be no assurance that  Protocol
and/or  Pryon  will  be able  to  offset  such downward  price  pressure through
corresponding cost reductions. Any failure to offset such pressure could have  a
material  adverse effect  on the  business, financial  condition and  results of
operation of the companies.
 
    DEPENDENCE ON  SUPPLIERS.   Both Protocol  and  Pryon rely  on a  number  of
single-source  suppliers to provide certain  parts for their products, including
pulse  oximetry,  electroluminescent   (EL)  display  subassemblies,   telemetry
transmitters  and receivers, and vacuum florescent displays. The interruption of
certain sources of supply  could disrupt each  company's ability to  manufacture
products  or cause the companies to  incur costs associated with the development
of alternative sources, either of which  could have an effect on the  companies'
financial  performance.  The long  purchasing  lead times  associated  with some
components limit the companies' ability to quickly adjust production volumes  to
meet  changes in customer  demand. An extended interruption  or reduction in the
supply of any key components could have a material adverse effect on Protocol or
Pryon's business, financial condition and results of operations.
 
    COST CONTAINMENT  PROGRAMS.   Both domestic  and international  health  care
providers  and governments are attempting to control the rate of increase and/or
reduce the cost  of health  care in their  respective countries.  In the  United
States,  major third-party payors  of hospital services  (Medicare, Medicaid and
private health  care insurance  companies)  have substantially  revised  payment
methodologies to contain health care costs. The introduction of various Medicare
cost  containment  incentives,  combined  with closer  scrutiny  of  health care
expenditures by  both private  health insurers  and employers,  has resulted  in
increased  contractual sales and discounts given by medical equipment suppliers.
These cost  containment measures  have also  caused greater  selectivity in  the
purchase  of medical equipment.  Health care industry  cost containment measures
are expected to continue and could adversely affect future sales of Protocol and
Pryon's products.
 
                                       13
<PAGE>
    PRODUCT DEFECTS; PRODUCT LIABILITY.  In the event either Protocol or Pryon's
products prove defective, the  companies may be required  to recall or  redesign
such  products. Such  a recall  or redesign could  cause the  companies to incur
considerable expenses, disrupt sales and adversely affect the reputation of  the
companies  and  their  products.  The  manufacturing  and  marketing  of medical
instruments involve  an inherent  risk of  product liability.  Although  neither
Protocol nor Pryon has experienced any product liability claims, there can be no
assurance  they  will not  experience such  claims in  the future.  Although the
companies maintain product liability insurance,  there can be no assurance  that
such  coverage  will be  adequate  or that  such  coverage will  continue  to be
available on  acceptable terms.  The companies'  businesses could  be  adversely
affected  by  successful  product  liability claims  in  excess  of  its product
liability coverage.
 
    GOVERNMENT  REGULATION.    The   development,  testing,  manufacturing   and
marketing of medical devices are subject to regulation by the United States Food
and  Drug Administration (the "FDA") and  foreign regulatory agencies. There has
been a  trend in  recent years  inside and  outside the  United States  to  more
stringent  regulation of, and enforcement of requirements applicable to, medical
device manufacturers. Although both Protocol and Pryon have successfully  passed
all  previous regulatory audits, there can be no assurance that the same results
will be  achieved in  the future.  Domestic and  foreign government  regulations
could  delay  or  prevent  product  introductions,  interfere  with  or  mandate
cessation of production  and marketing  of existing products,  or cause  product
recalls.
 
    DEPENDENCE  ON KEY PERSONNEL.  The future success of both Protocol and Pryon
is dependent on a number of key management and technical employees.  Competition
for  highly  skilled people  with extensive  experience in  medical electronics,
systems software,  and  miniaturization  is  intense.  Both  companies  will  be
dependent on the continued services and management experience of their executive
officers. If such executive officers were to leave, the operating results of the
combined  companies  could be  adversely affected.  The  future success  of both
companies will also  be dependent on  their ability to  continue to attract  key
managerial and technical personnel.
 
    PROTECTION  OF INTELLECTUAL  PROPERTY.   Both Protocol  and Pryon  rely on a
combination of patents, trademarks,  copyrights and other intellectual  property
law,  non-disclosure agreements and other  protective measures to preserve their
proprietary rights concerning their products. Such protection, however, will not
preclude competitors  from  developing  products  similar  to  either  company's
products.  In addition,  the laws  of certain  foreign countries  do not protect
intellectual property  rights to  the same  extent  as the  laws of  the  United
States.  Although both companies will  continue to implement protective measures
and intend  to defend  their  proprietary rights  vigorously,  there can  be  no
assurance that these efforts will be successful.
 
    ANTI-TAKEOVER  PROVISIONS.    Protocol's  Shareholder  Rights  Plan, certain
provisions  of  its  restated  Articles  and  Bylaws  and  the  Oregon  Business
Corporation  Act may  have the effect  of making  it more difficult  for a third
party to acquire control of  Protocol through either a  tender offer or a  proxy
contest  for the election of directors. This  could limit the price that certain
investors might be willing to  pay in the future  for shares of Protocol  Common
Stock and could make the removal of incumbent directors more difficult.
 
                                       14
<PAGE>
                    ANNUAL MEETING OF PROTOCOL SHAREHOLDERS
 
GENERAL
 
    This  Joint  Proxy Statement/Prospectus  is  being furnished  to  holders of
Protocol Common Stock  in connection  with the  solicitation of  proxies by  the
Protocol  Board for use at the Protocol  Annual Meeting to be held on Wednesday,
July 10, 1996, at  Protocol's offices at 8500  S.W. Creekside Place,  Beaverton,
Oregon  97008, commencing at 10:00 a.m., local  time, and at any adjournments or
postponements  thereof.   This   Joint  Proxy   Statement/Prospectus   and   the
accompanying  forms of proxy are first  being mailed to shareholders of Protocol
and Pryon on or about June 5, 1996.
 
MATTERS TO BE CONSIDERED AT THE MEETING
 
    At the Protocol Annual Meeting, shareholders of record of Protocol as of the
close of business on May 6, 1996,  will consider and vote upon (i) the  issuance
of  Protocol Common Stock  in exchange for  shares of Pryon  Stock, and upon the
exercise of  options  to  be  issued  by  Protocol  in  exchange  for  currently
outstanding  options exercisable for shares of Pryon Common Stock, in connection
with the Merger Agreement;  (ii) the election of  two directors to the  Protocol
Board,  each to  hold office for  a three-year  term; (iii) an  amendment to the
Protocol 1992 Plan to  increase from 875,000 to  1,336,422 shares the number  of
shares of Protocol Common Stock authorized for issuance thereunder to enable the
replacement  of outstanding options to purchase  Pryon Common Stock with options
to purchase Protocol Common Stock (approximately 211,422 shares) and to increase
the number  of shares  generally  available for  future  grants under  the  Plan
(approximately  250,000 shares);  (iv) amendments to  the Protocol  1993 Plan to
increase the  size of  certain  option grants  thereunder  and to  increase  the
maximum  number of options that  may be granted under the  Plan in any year; (v)
ratification  of  the  appointment  of  KPMG  Peat  Marwick  LLP  as  Protocol's
independent auditors for the fiscal year ending December 31, 1996; and (vi) such
other business as may properly be brought before the Protocol Annual Meeting.
 
    Holders  of Protocol Common Stock will not be entitled to dissenters' rights
as a result of the Issuance. See "THE MERGER -- Terms of the Merger."
 
    THE PROTOCOL BOARD HAS  APPROVED THE ISSUANCE AND  THE MERGER AGREEMENT  AND
RECOMMENDS THAT PROTOCOL SHAREHOLDERS VOTE "FOR" APPROVAL OF THE ISSUANCE, "FOR"
THE  NOMINEES FOR  DIRECTORS, "FOR" AMENDMENT  OF THE PROTOCOL  1992 PLAN, "FOR"
APPROVAL OF THE AMENDMENTS TO THE PROTOCOL 1993 PLAN AND "FOR" THE  RATIFICATION
OF  THE APPOINTMENT OF KPMG PEAT MARWICK LLP. SEE "BACKGROUND OF AND REASONS FOR
THE MERGER,"  "ELECTION  OF  PROTOCOL  DIRECTORS",  "APPROVAL  OF  AMENDMENT  TO
PROTOCOL  1992 STOCK INCENTIVE  PLAN," "APPROVAL OF  AMENDMENTS TO PROTOCOL 1993
STOCK OPTION PLAN FOR NONEMPLOYEE DIRECTORS" AND "RATIFICATION OF APPOINTMENT OF
PROTOCOL INDEPENDENT AUDITORS."
 
    As of the date of this Joint Proxy Statement/Prospectus, the Protocol  Board
of  Directors does not know  of any other matters to  be presented for action by
the shareholders at the Protocol Annual Meeting. Protocol's Bylaws require  that
notice with respect to matters to be presented for action by the shareholders at
an  annual meeting and nominations for director be delivered to the Secretary of
the Company not less than 60 days nor more than 90 days prior to the date of  an
annual  meeting, unless notice or  public disclosure of the  date of the meeting
occurs less than  60 days prior  to the date  of such meeting,  in which  event,
shareholders  may deliver such notice not later  than the 10th day following the
day on which notice of the date  of the meeting was mailed or public  disclosure
thereof was made. If any other matters not now known are properly brought before
the meeting, the persons named in the accompanying proxy will vote such proxy in
accordance  with  the  determination of  a  majority  of the  Protocol  Board of
Directors.
 
RECORD DATE; SHARES ENTITLED TO VOTE; VOTE REQUIRED
 
    The close of business on May 6,  1996 (the "Protocol Record Date") has  been
fixed  as the record date  for determining the holders  of Protocol Common Stock
who are entitled to notice of and to vote at the Protocol Annual Meeting. As  of
the Protocol Record Date, there were approximately 4,000
 
                                       15
<PAGE>
beneficial  holders  of  the  7,443,223 shares  of  Protocol  Common  Stock then
outstanding and entitled to vote. The  holders of record on the Protocol  Record
Date  of Protocol  Common Stock  are entitled  to one  vote per  Protocol Common
Share. The presence in person or by proxy of the holders of shares  representing
a  majority of the voting power of the Protocol Common Stock entitled to vote is
necessary to constitute a quorum for the transaction of business at the Protocol
Annual Meeting. Under Section 6(i)  of Part III of Schedule  D to the Bylaws  of
the   National  Association  of  Securities  Dealers,  Inc.  (the  "NASD"),  the
affirmative vote  of a  majority of  the total  votes cast  on the  proposal  is
required  for approval of the Issuance. The affirmative vote of the holders of a
majority of the outstanding shares of Protocol Common Stock is required to amend
the Protocol 1992 Plan. The affirmative vote of the holders of a majority of the
shares of Protocol Common Stock  present in person or  by proxy at the  Protocol
Annual  Meeting is  required to  amend the  Protocol 1993  Plan. If  a quorum is
present, Protocol's bylaws provide that directors are elected by a plurality  of
the  votes cast by the shares entitled to vote. Holders of Protocol Common Stock
are not entitled to cumulate votes in the election of directors.
 
    Abstention from voting and broker nonvotes will have the practical effect of
voting against the Issuance and the  approval of the amendments to the  Protocol
Stock  Option  Plans  since they  represent  one  less vote  for  such approval.
Abstention from voting  and broker nonvotes  on the election  of directors  will
have  no effect on the determination of  whether a plurality exists with respect
to a given nominee.
 
PROXIES; PROXY SOLICITATION
 
    Shares of Protocol  Common Stock  represented by  properly executed  proxies
received  at or prior to the Protocol  Annual Meeting that have not been revoked
will be voted at the Protocol Annual Meeting in accordance with the instructions
contained therein.  Shares  of Protocol  Common  Stock represented  by  properly
executed  proxies for which no instruction is given will be voted "FOR" approval
of the Issuance, "FOR" election of the nominees for director, "FOR" approval  of
the amendment to the Protocol 1992 Plan, "FOR" approval of the amendments to the
Protocol  1993 Plan and "FOR"  the ratification of the  appointment of KPMG Peat
Marwick LLP. Protocol  shareholders are  requested to complete,  sign, date  and
return promptly the enclosed proxy card in the postage-prepaid envelope provided
for this purpose to ensure that their shares are voted. A shareholder may revoke
a  proxy at any time before its  exercise by submitting a later-dated proxy with
respect to the same  shares, by delivering written  notice of revocation to  the
Secretary  of Protocol or by attending the Protocol Annual Meeting and voting in
person. Mere attendance at the Protocol Annual Meeting will not in and of itself
revoke a proxy.
 
    If the Protocol Annual Meeting is postponed or adjourned for any reason,  at
any  subsequent reconvening of  the Protocol Annual Meeting  all proxies will be
voted in the same manner as such  proxies would have been voted at the  original
convening  of  the Protocol  Annual Meeting  (except for  any proxies  that have
theretofore effectively been  revoked or withdrawn),  notwithstanding that  they
may  have been effectively voted  on the same or any  other matter at a previous
meeting.
 
    PROXY SOLICITATION.  Protocol will bear the cost of soliciting proxies  from
its  shareholders. In addition to solicitation  by mail, directors, officers and
employees of Protocol may solicit  proxies by telephone, telegram or  otherwise.
Such  directors, officers and employees will not be additionally compensated for
such solicitation, but may be reimbursed for out-of-pocket expenses incurred  in
connection  therewith.  Brokerage firms,  fiduciaries  and other  custodians who
forward soliciting material to  the beneficial owners  of Protocol Common  Stock
held of record by them will be reimbursed for their reasonable expenses incurred
in forwarding such material.
 
                                       16
<PAGE>
                     SPECIAL MEETING OF PRYON SHAREHOLDERS
 
GENERAL
 
    This Joint Proxy Statement/Prospectus is being furnished to holders of Pryon
Common  Stock, Pryon Series A Preferred Stock and Pryon Series B Preferred Stock
in connection with the solicitation of  proxies by the Pryon Board of  Directors
for use at the Special Meeting of Pryon shareholders to be held on July 8, 1996,
at  Pryon's  offices at  N93 W14575  Whittaker  Way, Menomonee  Falls, Wisconsin
53051, commencing  at  10:00  a.m.,  local time,  and  at  any  adjournments  or
continuances thereof. This Joint Proxy Statement/Prospectus and the accompanying
form of proxy is first being mailed to shareholders of Pryon on or about June 5,
1995.
 
MATTERS TO BE CONSIDERED AT THE MEETING
 
    At  the Pryon  Special Meeting,  shareholders of record  of Pryon  as of the
close of business  on June 3,  1996 will consider  and vote upon  a proposal  to
approve  and adopt  the Merger  Agreement and  the Merger.  The Merger Agreement
provides that, upon the terms and subject to the conditions thereof, Merger  Sub
will  merge into Pryon, Pryon will become a wholly owned subsidiary of Protocol,
and all shares of Pryon Common Stock,  Pryon Series A Preferred Stock and  Pryon
Series  B  Preferred  Stock  issued and  outstanding  immediately  prior  to the
Effective Time (other than  shares as to which  dissenters' rights of  appraisal
have  been duly  sought, perfected and  are not subsequently  withdrawn) and all
shares of Pryon  Common Stock  issuable upon  exercise of  Pryon Employee  Stock
Options will, collectively, be exchanged for 2,320,843 shares of Protocol Common
Stock (subject to adjustment under certain circumstances), to be allocated among
the shares of Pryon Common Stock, Pryon Series A Preferred Stock, Pryon Series B
Preferred  Stock and Pryon Employee Stock  Options in accordance with the rights
of each  such  class  or  series  as  set  forth  in  the  Pryon's  Articles  of
Incorporation.  See "THE MERGER -- Terms of the Merger." No fractional shares of
Protocol Common  Stock will  be  issued in  the  Merger. Any  fractional  amount
resulting  from the Merger will be rounded up  or down to the nearest full share
of Protocol Common Stock. See "THE MERGER  -- Terms of the Merger --  Fractional
Shares."
 
    Holders  of Pryon Common Stock  will be entitled to  dissenters' rights as a
result  of  the  Merger.  See  "THE   MERGER  --  Rights  of  Dissenting   Pryon
Shareholders."
 
    THE  PRYON  BOARD  HAS APPROVED  THE  MERGER  AGREEMENT AND  THE  MERGER AND
RECOMMENDS THAT  PRYON SHAREHOLDERS  VOTE  "FOR" APPROVAL  AND ADOPTION  OF  THE
MERGER  AGREEMENT. See "BACKGROUND OF AND REASONS FOR THE MERGER" and "CONFLICTS
OF INTEREST."
 
RECORD DATE; SHARES ENTITLED TO VOTE; VOTE REQUIRED
 
    The close of business  on June 3,  1996 (the "Pryon  Record Date") has  been
fixed  as the  record date  for determining the  holders of  Pryon Common Stock,
Pryon Series  A Preferred  Stock and  Pryon  Series B  Preferred Stock  who  are
entitled to notice of and to vote at the Special Meeting. As of the Pryon Record
Date,  there were 75,408  shares of Pryon  Common Stock, 58,505  shares of Pryon
Series A Preferred  Stock and 80,599  shares of Pryon  Series B Preferred  Stock
outstanding  and entitled  to vote.  The holders  of record  of shares  of Pryon
Common Stock on  the Pryon Record  Date are entitled  to one vote  per share  of
Pryon  Common Stock. The holders of record of shares of Pryon Series A Preferred
Stock and  Series B  Preferred  Stock are  entitled to  one  vote per  share  of
Preferred  Stock. The presence  in person or  by proxy of  the holders of shares
representing a majority of the voting power of the Pryon Stock entitled to vote,
and a  separate majority  of the  Pryon  Preferred Stock  entitled to  vote,  is
necessary  to constitute a quorum for the transaction of business at the Special
Meeting. The affirmative vote of holders  of shares representing (i) a  majority
of  the number of shares of Pryon Stock  outstanding and (ii) 66 2/3% of the sum
of the number  of shares of  (A) Pryon Series  A Preferred Stock  and (B)  Pryon
Series B Preferred Stock (collectively, the "Pryon Preferred Stock") outstanding
is necessary to approve and adopt the Merger Agreement and Merger.
 
    Abstentions from voting will have the practical effect of voting against the
approval  and  adoption  of  the  Merger Agreement  and  the  Merger  since they
represent one less vote for adoption of such
 
                                       17
<PAGE>
proposals. It is a condition of the Merger  that holders of not more than 5%  of
the  total number of shares  of Pryon Common Stock  that would be outstanding if
all outstanding shares of Pryon Preferred Stock were converted into Pryon Common
Stock exercise dissenter's rights. See "THE MERGER -- Conditions; Waivers."
 
    Certain shareholders of Pryon owning an aggregate of 189,629 shares of Pryon
Stock and representing 79.2%,  86.6% and 98.3% of  the outstanding Pryon  Common
Stock,  Pryon  Series A  Preferred  Stock and  Pryon  Series B  Preferred Stock,
respectively, have entered into an agreement with Protocol to vote all of  their
shares  of Pryon  Stock for  approval of  the Merger  and the  Merger Agreement.
Accordingly, approval  of the  Merger  and the  Merger  Agreement at  the  Pryon
Special Meeting is assured.
 
PROXIES; PROXY SOLICITATION
 
    Shares  of Pryon Stock represented by  properly executed proxies received at
or prior to the Pryon Special Meeting  that have not been revoked will be  voted
at  the Special Meeting  in accordance with  the instructions contained therein.
Shares of Pryon  Stock represented  by properly  executed proxies  for which  no
instruction  is given will  be voted "FOR"  approval and adoption  of the Merger
Agreement and the Merger.  Pryon shareholders are  requested to complete,  sign,
date  and  return promptly  the enclosed  form of  proxy in  the postage-prepaid
envelope provided for  this purpose  to ensure that  their shares  are voted.  A
shareholder  may revoke a proxy  by submitting at any time  prior to the vote on
the Merger  Agreement and  the Merger  a  written notice  of revocation  to  the
Secretary  of Pryon  or by  attending the  Pryon Special  Meeting and  voting in
person. Mere attendance at the Pryon Special  Meeting will not in and of  itself
revoke a proxy.
 
    If  the Pryon Special Meeting  is continued or adjourned  for any reason, at
any subsequent reconvening of the Special  Meeting all proxies will be voted  in
the  same manner as such proxies would have been voted at the original convening
of the Special Meeting (except for any proxies that have theretofore effectively
been revoked or withdrawn), notwithstanding that they may have been  effectively
voted on the same or any other matter at a previous meeting.
 
    Pryon  will bear  the cost of  soliciting proxies from  its shareholders. In
addition to solicitation by mail, directors, officers and employees of Pryon may
solicit proxies by  telephone, telegram or  otherwise. Such directors,  officers
and   employees  of  Pryon  will  not   be  additionally  compensated  for  such
solicitation, but  may  be reimbursed  for  out-of-pocket expenses  incurred  in
connection therewith.
 
                                       18
<PAGE>
                    BACKGROUND OF AND REASONS FOR THE MERGER
 
BACKGROUND
 
    The acquisition of a complementary business has been an ongoing objective of
Protocol's   business   strategy.  Protocol   continually   evaluates  potential
acquisition  or  merger   opportunities  and   considers  potential   alliances,
combinations,  joint development programs and  other strategic transactions with
other participants in the medical device industry.
 
    Over the  past several  years,  Pryon's management  has  from time  to  time
engaged in discussions with its Board of Directors and numerous companies in the
medical  industry in an  effort to explore  the evolution of  the medical device
industry and the future  of Pryon in  that industry. During  the course of  such
discussions,  Pryon has considered various alliances and combinations, including
product development, distribution and marketing alliances, business combinations
and related transactions.
 
    Protocol entered  into an  OEM relationship  with Pryon  in 1990,  with  the
objective  of incorporating Pryon CO(2) technology into the Protocol Propaq line
of portable monitors. Although an agreement was not reached, Protocol and  Pryon
entered into discussions regarding the merger of the two companies at that time.
Pryon  obtained equity financing  from venture capital  sources. Protocol worked
closely with Pryon from 1990 to 1992 to introduce the mainstream CO(2) option to
the Propaq product  line in November  of 1992. During  the period from  November
1992  until October  1995, Protocol  developed the  market for  the CO(2) option
while Pryon  continued to  address the  OEM market,  adding customers  including
Nellcor Puritan Bennett, SpaceLabs Medical, Marquette Electronics, Hellige, NEC,
Nihon  Kohden, Medical Data Electronics and  others. During the years 1993, 1994
and  1995,  purchases  by  Protocol  of  Pryon  products  totalled   $1,045,000,
$1,009,000 and $1,741,000, respectively.
 
    On  October  23,  1995,  Mr. Moon,  Chairman,  Chief  Executive  Officer and
President of Protocol met  with Mr. Carsten,  Chairman, Chief Executive  Officer
and  President of Pryon  while attending the  American Society of Anesthesiology
meeting in Atlanta,  Georgia. Preliminary  discussions were  held regarding  the
possibility  of a combination of the two  companies. Mr. Moon visited Pryon with
Mr. Carsten on  October 24,  1995 for the  purpose of  becoming better  informed
about the business of Pryon and the changes that had occurred in various aspects
of  Pryon's business during the preceding three years. On November 9, 1995 Pryon
retained  the  services  of  Cowen  &  Company  ("Cowen")  to  assist  Pryon  in
considering  strategic business alternatives. On  November 22, 1995 and November
28, 1995  in  response to  the  aforementioned and  continued  discussions,  Mr.
Carsten provided Mr. Moon with certain non-confidential financial information to
further explore a potential combination.
 
    On  December  1, 1995,  as  part of  a  regularly scheduled  meeting  of the
Protocol Board of Directors, Mr. Moon made a presentation to the Protocol  Board
concerning  the  strategic potential  of a  combination with  Pryon. Alternative
possibilities, including the established  OEM supplier relationship with  Pryon,
were  also discussed.  On December  14, 1995, as  part of  a regularly scheduled
meeting of  the Pryon  Board  of Directors,  Mr. Carsten  presented  alternative
strategies,  the risks  and benefits of  continued operations  as an independent
company, and the strategic alternatives of a business combination. The potential
of a combination with Protocol was discussed.
 
    On January  2, 1996,  Protocol and  Pryon executed  and delivered  a  Mutual
Confidentiality  Agreement and  Protocol retained  Wessels, Arnold  & Henderson,
L.L.C. ("Wessels")  to act  as its  financial  advisor. On  January 22,  1996  a
meeting  of the  Protocol Board  of Directors  was held  by telephone conference
call. Based  on the  information  provided by  Pryon under  the  Confidentiality
Agreement  and a review of the strategic  considerations of a combination by the
senior management  of Protocol  and  other information,  the Protocol  Board  of
Directors  authorized Mr. Moon to proceed  with the negotiation of a combination
of the two companies.
 
    Due diligence  information  was  exchanged between  the  two  companies.  On
February  5  and 6,  1996, Mr.  Moon, Mr.  Swanson and  Mr. Fee,  accompanied by
representatives of Wessels, visited Pryon to conduct their due diligence review.
Other Protocol  officers,  including Mr.  Gray,  Mr. Welch  and  Mr.  Hollstein,
visited  Pryon on February 7 through February  9, 1996, to perform due diligence
work in
 
                                       19
<PAGE>
their respective areas of responsibility. On February 7, 1996, Mr. Carsten,  Mr.
Kolasinski  and  three  other  members  of the  Pryon  Board  of  Directors, and
representatives of Cowen & Company  visited the Protocol facility in  Beaverton,
Oregon.  Mr. Moon presented the overview of Protocol, its products and strategic
direction. The terms of a combination were discussed in principle and items  for
clarification  and further due diligence were  also discussed. The meeting ended
with general agreement between the parties  regarding the positive aspects of  a
business  combination. Mr. Moon provided a summary of the outcome of the meeting
to the Protocol Board and was authorized to continue with the negotiation.
 
    A definitive Agreement  and Plan of  Merger to merge  the two companies  was
drafted  by Protocol and presented to Pryon  for review. Between February 14 and
February 20, 1996, several telephone calls between Mr. Moon and Mr. Carsten  and
their  respective  advisors resulted  in agreement  to the  terms of  a tax-free
reorganization as  described elsewhere  in this  document. On  February 16,  the
Protocol  Board  of  Directors  met  with  senior  executives  of  Protocol  and
Protocol's outside  financial and  legal advisors  to consider  approval of  the
Merger  Agreement. Mr.  Moon reviewed the  background of  the Merger. Protocol's
outside legal advisor reviewed key terms and conditions of the Merger Agreement.
Protocol's outside financial adviser,  Wessels, reviewed its financial  analysis
of  the  terms  and conditions  of  the Merger  and,  at the  conclusion  of its
presentation, delivered to  the Board  its opinion as  to the  fairness, from  a
financial point of view, to Protocol of the consideration to be paid pursuant to
the  Merger. See "Opinion of Protocol  Financial Advisor." On February 20, 1996,
Protocol and  Pryon signed  the Merger  Agreement and  Protocol issued  a  press
release providing the essential details of the Agreement.
 
    The  Merger Agreement was amended effective as of May 31, 1996 to change the
termination date  of  the Merger  Agreement  and  to change  the  definition  of
"Protocol  Market Value." The  Merger Agreement originally  provided that either
Protocol or Pryon  could terminate the  Merger Agreement if  the Merger was  not
consummated  on or before June 30, 1996. That  date was changed to July 12, 1996
in order to permit the Pryon Special Meeting and the Protocol Annual Meeting  to
be  held before the date  giving rise to the  parties rights of termination. The
Merger Agreement originally provided that the Protocol Market Value would be the
average closing price of  Protocol Common Stock during  the twenty trading  days
ending  on the sixth trading  day preceding the Effective  Time. As amended, the
Protocol Market Value will be the average closing price of Protocol Common Stock
during the thirty  trading days  ending on  June 14,  1996. The  effect of  this
change  is to increase the amount of time between the date on which the Protocol
Market Value is determined and the dates  of the meetings of Protocol and  Pryon
shareholders. As originally structured, the Protocol Market Value would not have
been  determinable  until  shortly before  the  meetings of  Pryon  and Protocol
shareholders. As amended, the Protocol Market value will be determinable on June
14, 1996, approximately three  weeks before the meetings  of Protocol and  Pryon
shareholders,  making it  possible for  such shareholders  to base  their voting
decisions on the actual Protocol Market Value and exchange ratio.
 
JOINT REASONS FOR THE MERGER
    Protocol and Pryon  have identified  several mutual benefits  of the  Merger
that they believe will contribute to the success of both companies including:
 
    COMPLEMENTARY  PRODUCTS  AND MARKETS.   The  products  of the  two companies
complement each other with no duplication or overlap. It is expected that all of
the products developed by each company will continue to be manufactured and sold
after the  Merger. While  both companies  have experience  selling in  both  the
medical  OEM and end  user markets, it  is believed that,  following the Merger,
both companies will benefit by  allowing Pryon to focus  on the unique needs  of
OEM customers while Protocol continues to focus on end user markets.
 
    COMPLEMENTARY TECHNOLOGIES.  Pryon's core technology and expertise is in the
design  and development  of highly sophisticated  electro-mechanical sensors for
measuring  CO(2);  Protocol's   core  technology   includes  highly   integrated
multi-parameter vital sign monitors along with extensive networking software and
signal   processing  algorithms.   While  each   company's  core   expertise  is
complementary to the other, there is little technology overlap or duplication of
expertise between the two companies.
 
                                       20
<PAGE>
    COMPATIBLE CULTURES.   Both  companies  have compatible  corporate  cultures
which  have emphasized the development of state-of-the-art medical technologies,
an intense focus on product  quality, open communication and an  entrepreneurial
spirit.  The two companies have  a long history of  working together as supplier
and customer.
 
PROTOCOL'S REASONS FOR THE MERGER
 
    In addition to the  mutual reasons for the  Merger stated above,  Protocol's
Board of Directors believes the following strategic factors will also contribute
to the success of the combined companies:
 
    CORE  TECHNOLOGY.  Protocol's strategic intent is to develop or own the core
technologies embodied in its products. Protocol believes technology ownership is
essential in order to provide  customers innovative and cost-effective  products
in today's highly competitive health care industry.
 
    ORIGINAL  EQUIPMENT  MANUFACTURING  (OEM) BUSINESS.    Since  its inception,
Protocol has  manufactured  products for  sale  by other  companies.  From  1989
through  1994 Protocol sold  portable vital sign  monitors to Siemens  on an OEM
basis, and  currently  sells a  closed-loop  drug delivery  device  (the  GenESA
device)  to Gensia, Inc. on  an OEM basis. It  is Protocol's belief that Pryon's
OEM business will provide added sales volume and greater financial stability  to
Protocol,  allow sale of  Protocol's technologies into  market segments it might
not directly address, and help to  position its key technologies as  "standards"
in the industry.
 
    GROWTH  AND VERTICAL INTEGRATION.  Pryon has established itself as a leading
supplier of CO(2) technology to many  of the world's premier medical  instrument
companies.  Protocol expects to  expand the CO(2) business  and to develop other
Protocol or Pryon technologies for the  OEM marketplace. By integrating a  major
supplier,  the merger will  enable Protocol to  maintain a competitive financial
posture in today's increasingly competitive health care environment.
 
    In the course of its deliberations in arriving at its unanimous decision  to
approve  the Merger, the Protocol Board  reviewed and considered with Protocol's
management a number  of other factors  relevant to the  Merger. The factors  the
Board  considered included, but were not  limited to, (a) information concerning
Protocol and Pryon's  respective businesses,  historical financial  performance,
operations,  products and technologies; (b) their strategic direction and future
product offerings and opportunities;  (c) an analysis  of the respective  future
contributions  to revenue,  operating profits  and net  profits of  the combined
company; (d) compatibility of the management and corporate cultures of  Protocol
and  Pryon; (e) premiums to market and multiples paid in other comparable merger
and acquisition  transactions; (f)  the structure  and content  of the  proposed
Merger  Agreement, including  the ability  to account  for the  transaction as a
pooling of interests;  (g) a  financial presentation by  Wessels, including  the
opinion  of Wessels that the consideration to  be paid to the holders of capital
stock of Pryon pursuant to the Merger Agreement was fair from a financial  point
of  view  to Protocol;  and  (h) reports  from  management, financial  and legal
advisors as to the results of their due diligence investigation of Pryon. For  a
discussion  of many of the foregoing matters, see "Opinion of Financial Advisor"
below.
 
    The Protocol Board also considered a variety of potentially negative factors
in its  deliberations  concerning  the Merger,  including  (a)  the  potentially
dilutive effect of issuing Protocol Common Stock in the Merger; (b) the expenses
to  be incurred in connection with the Merger and the effect of such expenses on
the results of operations in the quarter the Merger is consummated; (c) the risk
of losing current OEM customers due to their competitive posture with  Protocol;
(d)  the dependence  of Pryon on  the continued participation  of key management
personnel, and (e) other risks described under "Risk Factors" above. In view  of
the wide variety of factors considered, both positive and negative, the Protocol
Board  did not find it  practical to, and did  not, quantify or otherwise assign
relative weights to the specific factors considered, but did determine that  the
anticipated  benefits of the Merger  outweighed the potentially negative factors
considered.
 
PRYON'S REASONS FOR THE MERGER
 
    INDUSTRY CONSOLIDATION.  The health care industry is undergoing  significant
consolidation  as companies position  themselves to compete in  an era of health
care reform and downsizing. It is
 
                                       21
<PAGE>
Pryon's  belief that  larger companies  with significant  brand-name recognition
will be  better able  to compete  in this  market. Following  the Merger,  Pryon
believes   that   the   combined  organization's   strong   financial  position,
public-company status and reputation with health care end users will help it  to
better  market its products. Pryon believes  that access to Protocol's dedicated
direct sales  force  in  the  United States  for  the  distribution  of  Pryon's
stand-alone   instruments  significantly   increases  the   revenue  opportunity
available to Pryon over  that available through its  own network of  independent
distributors.  Additionally, Pryon believes that the greater financial resources
of the combined company will increase Pryon's attractiveness as a key, long-term
supplier of OEM technologies.
 
    OWNERSHIP IN COMBINED COMPANY.  The Merger will enable Pryon shareholders to
convert all of  their Pryon  shares into  publicly tradable  shares of  Protocol
Common  Stock on  a tax-free  basis while  continuing to  maintain a significant
equity  interest  in  a  larger  company  with  greater  financial,  sales   and
distribution  capabilities.  In  addition,  Pryon  shareholders  will  receive a
significant premium over the price originally paid for their Pryon Stock.
 
    In reaching its  unanimous decision  to enter  into and  endorse the  Merger
Agreement, the Pryon Board reviewed and considered a number of relevant factors.
The  factors  the  Board  considered  included,  but  were  not  limited  to (a)
information concerning Protocol  and Pryon's  respective businesses,  historical
financial  performance,  operations,  products  and  technologies;  (b)  current
financial market conditions and historical market prices, volatility and trading
information with respect to Protocol Common  Stock; (c) the consideration to  be
received  by  Pryon  shareholders in  the  Merger  and its  relation  to Pryon's
expected contribution to the earnings of the combined company; (d) the terms and
conditions of the Merger, including the parties' representations, warranties and
obligations thereunder and the fact that the Merger will enable the shareholders
to exchange their shares on a tax-free  basis; (e) the effects of the Merger  on
Pryon's  customers and  business; (f) the  prospects of Pryon  as an independent
company; (g) the financial advice of Cowen & Company, Pryon's financial advisor;
and (h) the reports of management, legal and other financial advisors  regarding
their due diligence investigations of Protocol.
 
    The  Pryon Board also considered a number of potentially negative factors in
deliberations  concerning  the  Merger  including,  but  not  limited  to,   the
possibility  that the Merger  might not be  consummated, and the  effects of the
public announcement  of  the Merger  Agreement  on Pryon's  financial  position,
results  of operations and its  ability to attract and  retain key personnel. In
view of the wide variety of factors considered, both positive and negative,  the
Pryon  Board did not  find it practical  to, and did  not, quantify or otherwise
assign relative weights to  the specific factors  considered, but did  determine
that the anticipated benefits of the Merger outweighted the potentially negative
factors considered.
 
RECOMMENDATION OF PROTOCOL BOARD
 
    The  Protocol Board has determined the Issuance and the Merger to be fair to
and in the best interests of Protocol and its shareholders and has approved  the
Issuance  and the Merger Agreement. The  Protocol Board recommends that Protocol
shareholders vote FOR the Issuance and the amendment of the Protocol 1992  Plan.
The  Protocol  Board's  recommendations  are  based  upon  a  number  of factors
discussed in this Joint Proxy Statement/Prospectus.
 
OPINION OF PROTOCOL FINANCIAL ADVISOR
 
    OPINION OF WESSELS,  ARNOLD &  HENDERSON.   Wessels has  acted as  financial
advisor  to Protocol  in connection with  the Merger. Pursuant  to an engagement
letter dated  January  2,  1996  (the  "Wessels  Engagement  Letter"),  Protocol
retained  Wessels to furnish financial  advisory and investment banking services
with respect to a possible  merger between Protocol and  Pryon and to render  an
opinion  as to the fairness, from a financial  point of view, to Protocol of the
consideration to be paid in any proposed merger. The amount of consideration  to
be  paid to Pryon shareholders in the Merger was determined through negotiations
between Protocol management and  Pryon management and  not by Wessels,  although
Wessels did assist Protocol in these negotiations.
 
                                       22
<PAGE>
    Wessels rendered its oral opinion on February 16, 1996 (confirmed in writing
on  February 20, 1996) to the Protocol Board  of Directors that, as of such date
and based on the procedures followed, factors considered and assumptions made by
Wessels as set forth  therein, the consideration  to be paid  to the holders  of
capital  stock  of  Pryon pursuant  to  the  Merger Agreement  is  fair,  from a
financial point of view, to Protocol.
 
    THE COMPLETE  TEXT OF  THE OPINION  DATED FEBRUARY  20, 1996  (THE  "WESSELS
OPINION")  IS ATTACHED HERETO AS  APPENDIX B AND THE  SUMMARY OF THE OPINION SET
FORTH BELOW IS QUALIFIED IN ITS ENTIRETY  BY REFERENCE TO THE FULL TEXT OF  SUCH
OPINION.  SHAREHOLDERS OF PROTOCOL ARE URGED  TO READ SUCH OPINION CAREFULLY AND
IN ITS  ENTIRETY FOR  A  DESCRIPTION OF  THE  PROCEDURES FOLLOWED,  THE  FACTORS
CONSIDERED,  THE ASSUMPTIONS MADE AND SCOPE OF THE REVIEW UNDERTAKEN BY, AS WELL
AS LIMITATIONS ON THE  REVIEW UNDERTAKEN BY, WESSELS  IN RENDERING ITS  OPINION.
PROTOCOL  BELIEVES  THAT  ALL  MATERIAL  ELEMENTS  OF  THE  WESSELS  OPINION ARE
SUMMARIZED IN THIS JOINT PROXY STATEMENT/PROSPECTUS.
 
    The Wessels Opinion applies only to the fairness of the consideration to  be
paid to the Pryon shareholders pursuant to the terms of the Merger Agreement and
should  not  be deemed  to constitute  a recommendation  by Wessels  to Protocol
shareholders to  vote in  favor of  any  matter presented  in this  Joint  Proxy
Statement/Prospectus.   Protocol  shareholders  should  note  that  the  opinion
expressed by Wessels was provided for the use of the Protocol Board of Directors
in its evaluation of the Merger. The Protocol Board of Directors did not  impose
any  limitations on the  scope of the  investigation of Wessels  with respect to
rendering its opinion.
 
    In preparing the Wessels Opinion,  Wessels among other things: (i)  reviewed
and  analyzed the  financial terms  of the  Merger Agreement;  (ii) reviewed and
analyzed certain financial and other information relating to Protocol and  Pryon
furnished  to it  by both  companies, including  certain internal  financial and
other information  prepared  by  management;  (iii)  reviewed  certain  publicly
available  information about Protocol and Pryon;  (iv) held discussions with the
managements of  Protocol and  Pryon concerning  the business,  past and  current
business operations, financial condition and future prospects of both companies,
including  certain information prepared by the management of Protocol concerning
potential cost savings  and synergies  that could  result from  the Merger;  (v)
reviewed  the financial performance of publicly traded companies which it deemed
comparable to Pryon; (vi) compared the financial terms of the Merger with  those
of  certain  merger transactions,  to the  extent  publicly available,  which it
deemed relevant;  (vii) prepared  discounted cash  flow analyses  of Pryon;  and
(viii) analyzed the pro forma earnings per share of the combined company.
 
    In arriving at the Wessels Opinion, Wessels did not independently verify any
of  the  foregoing  information  and  assumed and  relied  on  the  accuracy and
completeness of all such  information. Furthermore, Wessels  did not obtain  any
independent appraisal of the properties or assets and liabilities of Protocol or
Pryon  or  of any  of  their subsidiaries.  With  respect to  the  financial and
operating forecasts (and assumptions and  bases therefor) of Protocol and  Pryon
which  Wessels reviewed, including potential cost savings and synergies, Wessels
assumed that such forecasts have been  reasonably prepared and reflect the  best
available  estimates and judgments of such  respective managements and that such
forecasts will be  realized in  the amounts and  in the  time periods  currently
estimated  by the managements  of Protocol and Pryon.  Wessels also assumed that
the Merger  will be  accounted for  as a  pooling of  interests under  generally
accepted  accounting principles. Events occurring after  the date of the Wessels
Opinion may  materially affect  the assumptions  used in  preparing the  Wessels
Opinion.  Although Wessels believes that its  review, as described within, is an
adequate basis for the  opinion that Wessels expresses,  the Wessels Opinion  is
necessarily based upon market, economic, and other conditions that exist and can
be  evaluated as  of the date  of the  opinion, and on  information available to
Wessels  as  of  such  a  date.  Wessels  expressed  no  opinion  regarding  the
liquidation  value of any entity nor as to the price at which shares of Protocol
Common Stock may trade at any future time.
 
    The following  paragraphs summarize  the most  significant quantitative  and
qualitative  analyses  performed by  Wessels in  connection with  delivering the
Wessels Opinion to the Protocol Board of
 
                                       23
<PAGE>
Directors and does  not purport  to be a  complete description  of the  analyses
performed  by Wessels. The information presented below is based on the financial
condition of Protocol and Pryon as of a date or dates shortly before the  Merger
Agreement  was executed on February 20, 1996 and stock price information through
the close of the market on February 15, 1996.
 
    COMPARABLE COMPANY ANALYSIS.  Wessels used a comparable company analysis  to
analyze  Pryon's operating  performance relative to  a group  of publicly traded
companies which Wessels deemed for purposes of its analysis to be comparable  to
Pryon.  In such  analysis, Wessels  compared the value  to be  achieved by Pryon
shareholders in the Merger, expressed as  a multiple of certain operating  data,
to the market trading values of the comparable companies expressed as a multiple
of  the same operating results. Wessels compared multiples of selected financial
data for Pryon with those of the following publicly traded companies:  Datascope
Corporation,   Marquette  Electronics,  Inc.,  Nellcor  Puritan  Bennett,  Inc.,
Protocol  and  SpaceLabs  Medical,  Inc.   (collectively  referred  to  as   the
"Comparable  Companies").  Although  the  Comparable  Companies  were considered
comparable  to  Pryon  for  the  purpose  of  its  analysis  based  on   certain
characteristics of their respective businesses, none of such companies possessed
characteristics  identical  to  those  of  Pryon.  Wessels  calculated valuation
multiples for Pryon based on an aggregate equity value of Protocol Common  Stock
to be issued pursuant to the Merger Agreement of approximately $28.4 million and
an  aggregate enterprise value (implied value of  Common Stock plus cost of long
term debt and  certain transaction  related expenses, less  cash and  marketable
securities)  of  approximately  $29.5  million.  Pryon's  multiples  of  futures
earnings were based  in part on  the projected earnings  as provided by  Pryons'
management.  Comparable Companies'  multiples of  future earnings  were based on
projected earnings as estimated by recognized security analysts, as well as  the
stock  price values  and other information  available on or  before February 15,
1996. This analysis produced  a mean multiple of  aggregate enterprise value  of
latest 12-month revenues for the Comparable Companies of 2.0, as compared to 2.5
for  Pryon. The mean  multiple of aggregate enterprise  value to latest 12-month
operating income for the Comparable Companies was 14.7, as compared to 30.3  for
Pryon.  The multiple  of aggregate  equity value  to projected  earnings for the
Comparable Companies  and for  Pryon was  as follows:  (i) a  mean of  projected
calendar 1996 earnings of 18.8 for the Comparable Companies, as compared to 17.4
for  Pryon, and (ii) a mean of projected  calendar 1997 earnings of 15.0 for the
Comparable Companies, as compared to 14.9  for Pryon. The mean aggregate  equity
valuation  to projected calendar 1996 earnings ratio as a multiple of three-year
growth rate was 58% for Pryon, as compared to a mean of 122% for the  Comparable
Companies.
 
    COMPARABLE  TRANSACTIONS.  Wessels compared  multiples of selected financial
data relating to  the Merger with  multiples paid in,  and other financial  data
from  13 completed acquisitions since November of 1993 (collectively referred to
as the  "Comparable  Acquisitions").  These  transactions  were  selected  based
primarily  on the acquired company's involvement  in the medical device industry
as well as the aggregate enterprise value paid to acquire the acquired  company.
Wessels noted that none of the acquired companies involved in these transactions
had  a business that was directly comparable  to Pryon. This analysis produced a
mean multiple of aggregate enterprise value to latest 12-month revenues for  the
Comparable  Acquisitions of 3.8, as compared to 2.5 for Pryon. The mean multiple
of aggregate  enterprise  value to  latest  12-month operating  income  for  the
Comparable  Acquisitions  (for companies  with  operating income)  was  22.5, as
compared to  30.3 for  Pryon. The  mean multiple  of aggregate  equity value  to
latest  12-month net income  for the Comparable  Acquisitions (for the companies
with net income) was 31.3, as compared  to 35.5 for Pryon. The mean multiple  of
aggregate  equity  value to  projected forward  fiscal year  net income  for the
Comparable Acquisitions  (for  the  companies  with net  income)  was  30.9,  as
compared to 17.4 for Pryon.
 
    PRO  FORMA MERGER  ANALYSIS.  Wessels  analyzed the potential  effect of the
Merger on the  projected combined  income statement  of Pryon  and Protocol  for
Protocol's  fiscal years  ending December 31,  1996 and December  31, 1997 using
projected results of operations of Pryon and Protocol for periods subsequent  to
the  Merger and related assumptions based in part on information provided by the
management of  Pryon and  Protocol, including  the effect  of cost  savings  and
synergies in the Merger.
 
                                       24
<PAGE>
This  analysis concluded that  the Merger would  not affect Protocol's projected
earnings per  share for  the  year ending  1996  and would  increase  Protocol's
projected earnings per share for the year ending 1997 by approximately $0.03 per
share.
 
    DISCOUNTED  CASH FLOW ANALYSIS.   Wessels estimated  present values of Pryon
using  a  discounted  cash  flow  analysis  of  Pryon's  projections  of  future
operations  based in part on information provided by Pryon's management. Wessels
calculated present values of  Pryon's projected operating  cash flows after  net
investment,  depreciation and amortization,  and changes to  working capital for
the four years ending 1996 to 1999 using discount rates ranging from 21% to 29%.
Wessels calculated a terminal value using terminal multiples of operating income
ranging from 13.2  to 16.2  of Pryon's  projected calendar  year 1999  operating
income.  The  terminal value  was  discounted to  present  value using  the same
discount rates as the  cash flows. Wessels calculated  the implied valuation  of
Pryon  by adding the present value of the cash flows and the terminal value. The
implied value of Pryon based on this analysis ranged from $32.9 million to $48.8
million, with a midpoint of $40.1 million.
 
    Wessels noted that  the valuation  multiples of Pryon  are generally  higher
than  the  valuation  multiples  of  the  Comparable  Companies  and  Comparable
Acquisitions, when  calculated using  historical operating  data, and  generally
lower  than the valuation  multiples of the  Comparable Companies and Comparable
Acquisitions, when calculated using forecast operating data. Wessels also  noted
that  the valuation multiples  of Pryon are generally  higher than the valuation
multiples of the Comparable Acquisitions, when using historical operating  data,
and  lower than  the valuation  multiples of  the Comparable  Acquisitions, when
calculated using  forecast  operating  data.  Wessels  believes  that  valuation
multiples  based on historical  operating data are  generally less relevant than
valuation multiples based on forecast  operating data, and that a  determination
as  to the fairness of the Merger from a financial point of view depends in part
upon Pryon's forecast operating results.
 
    The preparation  of a  fairness opinion  is  a complex  process and  is  not
necessarily  susceptible  to partial  analysis  or summary  description. Wessels
believes that its  analyses must  be considered as  a whole  and that  selecting
portions  of  its  analyses  and  of  the  factors  considered  by  it,  without
considering all factors and analyses,  could create an incomplete or  misleading
view  of  the processes  underlying  its opinion.  In  arriving at  its fairness
determination, Wessels considered the results of  all such analyses. In view  of
the  wide variety of factors considered in connection with its evaluation of the
fairness of the  Merger consideration, Wessels  did not find  it practicable  to
assign  relative weights to  the factors considered in  reaching its opinion. No
company or transaction used in the  above analysis as a comparison is  identical
to  Pryon or Protocol or the proposed  Merger. The analyses were prepared solely
for purposes of Wessels providing its opinion  as to the fairness of the  Merger
consideration  pursuant  to  the  Merger  Agreement and  do  not  purport  to be
appraisals or necessarily reflect the  prices at which businesses or  securities
actually  may be sold. Analyses  based upon forecasts of  future results are not
necessarily indicative of actual future results, which may be significantly more
or less  favorable than  suggested by  such analyses.  As described  above,  the
Wessels  Opinion, including presentation to the Protocol Board of Directors, was
one of many factors taken into consideration by the Protocol Board of  Directors
in making its determination to approve the Merger Agreement.
 
    Wessels  is a nationally recognized investment banking firm and is regularly
engaged in the valuation of businesses and securities in connection with mergers
and acquisitions, negotiated  underwritings, secondary  distributions of  listed
and  unlisted securities,  private placements  and valuations  for corporations.
Wessels is familiar with Protocol, having acted as a managing underwriter of the
initial public  offering  of  Protocol  Common Stock  in  March  1992.  Protocol
selected  Wessels as  its financial advisor  based on  Wessels' familiarity with
Protocol, its  knowledge of  the  health care  industry  and its  experience  in
mergers  and acquisitions and in securities valuation generally. In the ordinary
course of business, Wessels acts  as a market maker  and broker in the  publicly
traded  securities of Protocol and receives customary compensation in connection
therewith, and  also provides  research coverage  on Protocol.  In the  ordinary
course   of   business,  Wessels   actively  trades   in  the   publicly  traded
 
                                       25
<PAGE>
securities of Protocol for its own account and for the accounts of its customers
and, accordingly,  may  at any  time  hold a  long  or short  position  in  such
securities which positions, on occasion, may be material in size relative to the
volume of trading activity.
 
    Pursuant  to the Wessels Engagement Letter, Protocol paid Wessels a retainer
fee of $25,000 (the "Retainer Fee") and a non-refundable opinion fee of $125,000
(the "Opinion Fee")  upon the  rendering of  the Wessels  Opinion. In  addition,
pursuant  to the Wessels Engagement Letter,  Protocol has agreed to pay Wessels,
upon consummation of the Merger, as defined in the Wessels Engagement Letter,  a
transaction  fee (the "Transaction Fee") of $400,000. Payment of the Transaction
Fee is contingent  upon consummation  of the Merger;  the Retainer  Fee and  the
Opinion  Fee will  be credited  against the  Transaction Fee.  Protocol has also
agreed to reimburse  Wessels for  its reasonable out-of-pocket  expenses and  to
indemnify  Wessels against  certain liabilities  relating to  or arising  out of
services performed by Wessels as financial advisor to Protocol. The terms of the
Wessels Engagement Letter, which are  customary in transactions of this  nature,
were  negotiated at arm's length between  Protocol and Wessels, and the Protocol
Board of Directors was aware of such arrangement at the time of its approval  of
the Merger Agreement.
 
RECOMMENDATION OF PRYON BOARD
 
    The  Pryon Board  has determined the  Merger to be  fair to and  in the best
interests of Pryon and  its shareholders and has  approved the Merger  Agreement
and  the Merger. The Pryon Board  recommends that Pryon shareholders approve the
Merger Agreement and the Merger. See "CONFLICTS OF INTEREST."
 
ADVICE OF PRYON'S FINANCIAL ADVISOR
 
    Cowen & Company has acted as  financial advisor to Pryon in connection  with
the  Merger. Pursuant to an engagement letter dated November 9, 1995 (the "Cowen
Engagement Letter"),  Pryon retained  Cowen to  furnish financial  advisory  and
investment  banking  services  with  respect to  assisting  Pryon  in evaluating
strategic business alternatives. Cowen  was selected by  Pryon as its  financial
advisor  because Cowen  is a nationally  recognized investment  banking firm and
because the  principals of  Cowen have  substantial experience  in  transactions
similar to the Merger and are familiar with Pryon and its businesses. As part of
its  investment banking business, Cowen is  continually engaged in the valuation
of businesses and their securities  in connection with mergers and  acquisitions
and  valuations for corporate  and other purposes. In  addition, in the ordinary
course of its business, Cowen trades  the equity securities of Protocol for  its
own  account and for the accounts of  its customers, and accordingly, may at any
time hold a long or short position in such securities.
 
    In advising  Pryon, Cowen:  (i) assisted  Pryon in  preparing a  descriptive
memorandum  for the purposes of describing  Pryon to prospective acquirors; (ii)
developed a list of prospective acquirors that might be interested in  acquiring
Pryon;  (iii)  assisted in  performance of  financial  analysis with  respect to
Protocol; (iv) provided counsel with respect to and participated in  discussions
and  negotiations with  Protocol; and  (v) provided  advice with  respect to the
pricing,  financing,  structure  and  form  of  transaction  with  Protocol.  In
addition,  Cowen: (a) reviewed certain information, furnished to it by Pryon, of
a business  and financial  nature regarding  Pryon; (b)  discussed with  Pryon's
management   Pryon's  competitive  position,   current  and  anticipated  future
conditions in the respiratory industry, and the potential strategic synergies of
the combination  with  Protocol; and  (c)  reviewed certain  publicly  available
filings  of  Protocol with  the  Securities and  Exchange  Commission, including
consolidated financial statements for the fiscal years ended December 31,  1992,
1993,  and 1994  and the  fiscal quarters ended  September 31,  1995. Cowen held
meetings and discussions  with representatives  of the management  of Pryon  and
Protocol  to discuss the  business operations, historical  financial results and
future prospects  of Pryon,  Protocol  and the  combined company.  In  addition,
Cowen:  (i) reviewed the Merger Agreement; (ii) compared Protocol and Pryon from
a financial point of view, with  certain other companies deemed relevant;  (iii)
analyzed   pro   forma  earnings   of  the   combined  company;   (iv)  analyzed
 
                                       26
<PAGE>
pro forma ownership in the combined company by Pryon's current shareholders; and
(v) reviewed historical  market prices  and trading volumes  of Protocol  Common
Stock  from  January  1995  through January  1996,  and  compared  those trading
histories with other companies deemed relevant.
 
    Cowen  assumed  and  relied,  without  independent  verification,  upon  the
accuracy  and  completeness  of the  financial  and other  information  that was
available to it from public sources, that  was provided to it by Pryon or  their
representatives, or that was otherwise reviewed by it. In addition, with respect
to  the  financial projections  furnished to  Cowen  by Pryon  management, Cowen
assumed the attainability of  the financial results therein  and that they  were
reasonably  prepared on bases reflecting  the best currently available estimates
and judgments of  the future financial  performance by Pryon,  Protocol and  the
combined   company.  Because   such  projections   are  inherently   subject  to
uncertainty, none  of  Pryon,  Protocol,  Cowen  or  any  other  person  assumes
responsibility  for their accuracy. Cowen did not make any independent valuation
or appraisal of the assets  or liabilities of Pryon  or Protocol, nor has  Cowen
been   furnished   with  any   such  appraisals.   Cowen  made   no  independent
investigations of any legal matters affecting Pryon or Protocol. Cowen's  advice
was  necessarily based on economic, market and other conditions as in effect on,
and the information made available to it as of, February 20, 1996.
 
    To provide  contextual  data  and comparative  market  information  for  the
purposes  of advising Pryon's  Board of Directors  to negotiate exclusively with
Protocol rather than undertake an extensive auction process, Cowen performed the
following analyses:
 
    MARKET TRADING ANALYSIS.  Cowen  compared selected historical operating  and
financial ratios for Pryon to the corresponding data and ratios of certain other
companies  whose securities  are publicly traded  and which  Cowen believes have
operating, market valuation,  and trading  valuations similar to  what might  be
expected  of  Pryon. These  companies included  Acquitron Medical,  Inc., Allied
Healthcare Products, Chad Therapeutics, Inc., Criticare Systems Inc., Healthdyne
Technologies,  Inc.,   Infrasonics,   Inc.,  Invacare   Corporation,   Marquette
Electronics,  Nellcor  Puritan  Bennett, Novametrix  Medical  Systems, Protocol,
ResMed, Respironics Inc., and Vital Signs (the "Selected Companies"). Such  data
and  ratios include  the market capitalization  of common stock  plus total debt
less cash and  equivalents ("Adjusted Price")  of such Selected  Companies as  a
multiple  of revenues. Cowen also  examined the ratios of  the current prices of
the Selected Companies to the estimated earnings per share ("EPS") (as estimated
by Institutional Brokers  Estimating System  and First Call)  for the  following
fiscal  years for these companies. Such analysis indicated that, of the Selected
Companies, (i)  the median  values of  Adjusted Price  as a  multiple of  latest
twelve  months' revenue was 1.7x, as compared to the corresponding multiples for
Pryon implied by Protocol's offer of 2.4x;  and (ii) the median values of  price
per  share as  a multiple  of estimated  EPS for  the following  fiscal year was
22.2x,  as  compared  to  the  corresponding  multiples  for  Pryon  implied  by
Protocol's offer of 25.3x (using fully taxed net income for Pryon).
 
    PRO  FORMA EARNINGS  ANALYSIS.  Cowen  analyzed the potential  effect of the
Merger on the  projected combined  income statement  of Pryon  and Protocol  for
Protocol's  fiscal years  ending December 31,  1996 and 1997.  This analysis was
based on:  a)  projections for  Pryon  as  provided by  Pryon's  management;  b)
Protocol's estimated EPS as estimated by Institutional Brokers Estimating System
and First Call; and c) Protocol's prevailing market price of $12.00 per share as
of  January 24,  1996. This  analysis concluded  that the  Merger would increase
Protocol's projected EPS  for the year  ending 1996 by  approximately $0.02  and
would   decrease  Protocol's  projected   EPS  for  the   year  ending  1997  by
approximately $0.01. Cowen's pro forma  earnings analysis excluded the  possible
effect of cost savings and synergies in the Merger.
 
    PRO  FORMA OWNERSHIP  ANALYSIS OF THE  COMBINED ENTITY.   Cowen analyzed pro
forma ownership in the combined entity by Pryon's shareholders. Cowen's analysis
concluded that based  on Protocol's then  prevailing stock price  of $12.00  per
share, Pryon's shareholders would own approximately 23% of the combined entity.
 
                                       27
<PAGE>
    PROTOCOL'S  HISTORICAL  STOCK PRICE  TRADING  HISTORY.   Cowen  reviewed the
historical market prices and  trading volumes of  Protocol Common Stock  between
January  3, 1995 and  January 24, 1996.  Cowen observed that  during this period
approximately 91% of Protocol's shares traded between prices of $9.00 and $12.00
per share  and that  the average  daily  volume of  Protocol shares  traded  was
approximately 62,800 during this period.
 
    The  summary set forth above  is a description the  material elements of the
analyses performed by  Cowen. In  performing its analyses,  Cowen made  numerous
assumptions   with  respect  to  industry  performance,  business  and  economic
conditions and  other  matters.  These  analyses  performed  by  Cowen  are  not
necessarily  indicative  of  actual  values  or  future  results,  which  may be
significantly more or less favorable than those suggested by such analyses.
 
    Cowen was not requested to,  and did not, opine as  to the fairness, from  a
financial  point  of  view,  of  the  consideration  to  be  received  by  Pryon
stockholders in the Merger. Pursuant to  the Cowen Engagement Letter, Pryon  has
agreed to pay certain fees to Cowen for its financial advisory services relating
to  the  Merger. Upon  consummation of  the  Merger, Cowen  will be  entitled to
receive a transaction fee (the "Cowen  Transaction Fee") in the amount equal  to
2.0% of the aggregate consideration paid by Protocol to Pryon's shareholders, up
to  $25 million,  and an  amount equal  to 3.0%  of the  aggregate value  of the
consideration paid by Protocol to Pryon's shareholders in excess of $25 million,
and an additional $50,000  if the aggregrate consideration  paid by Protocol  to
Pryon's  shareholders exceeds  $31 million.  If the  Merger is  not consummated,
Pryon has agreed to pay  Cowen an advisory fee  of $75,000 in consideration  for
Cowen's professional services. Additionally, Pryon has agreed to reimburse Cowen
for  its out-of-pocket expenses  (including the reasonable  fees and expenses of
its counsel) incurred or accrued during  the period of, and in connection  with,
Cowen's  engagement. Pryon  has also agreed  to indemnify  Cowen against certain
liabilities, including liabilities under  the federal securities laws,  relating
to  or arising out of services performed  by Cowen as financial advisor to Pryon
in connection with  the Merger,  unless such  liabilities arise  out of  Cowen's
gross negligence or willful misconduct.
 
                                       28
<PAGE>
                                   THE MERGER
 
    THE  DESCRIPTION OF THE MERGER AGREEMENT SET FORTH BELOW DOES NOT PURPORT TO
BE COMPLETE  AND  IS  QUALIFIED IN  ITS  ENTIRETY  BY REFERENCE  TO  THE  MERGER
AGREEMENT  A  COPY  OF WHICH  IS  ATTACHED AS  APPENDIX  I TO  THIS  JOINT PROXY
STATEMENT/PROSPECTUS AND INCORPORATED BY REFERENCE HEREIN.
 
TERMS OF THE MERGER
 
    THE MERGER.  Subject  to the terms and  conditions of the Merger  Agreement,
Merger  Sub will merge with  and into Pryon at  the Effective Time. The separate
corporate existence  of  Merger Sub  will  then cease,  and  Pryon will  be  the
surviving corporation in the Merger (the "Surviving Corporation").
 
    ARTICLES  OF INCORPORATION AND  BYLAWS.  The  Merger Agreement provides that
the Articles of Incorporation  of Merger Sub as  in effect immediately prior  to
the  Effective Time will  become the articles of  incorporation of the Surviving
Corporation, except that Article I thereof  will be amended to read as  follows:
"The name of this corporation is Pryon Corporation." The bylaws of Merger Sub as
in  effect immediately prior to the Effective Time will become the bylaws of the
Surviving Corporation.
 
    DIRECTORS AND OFFICERS.  The directors  of Merger Sub at the Effective  Time
will  become the directors  of the Surviving  Corporation until their successors
have been duly elected or appointed and qualified or until their earlier  death,
resignation  or removal; except that such  directors will act promptly after the
Effective Time to increase the number of directors of the Surviving  Corporation
from  two to three members and to appoint  Daniel F. Carsten to fill the vacancy
so created. The officers of Pryon at the Effective Time will become the officers
of the Surviving Corporation  until their successors have  been duly elected  or
appointed  and qualified or  until their earlier  death, resignation or removal.
See "THE MERGER -- Management and Operations of Pryon After the Merger."
 
    CONVERSION OF PRYON STOCK IN THE MERGER.  At the Effective Time, all  shares
of  Pryon  Common Stock,  Pryon  Series A  Preferred  Stock and  Pryon  Series B
Preferred Stock issued and outstanding  immediately prior to the Effective  Time
(other  than shares as to  which dissenters' rights of  appraisal have been duly
sought, perfected and are  not subsequently withdrawn) and  all shares of  Pryon
Common  Stock issuable upon  exercise of the Pryon  Employee Stock Options will,
collectively, be exchanged for  2,320,843 shares of  Protocol Common Stock  (the
"Aggregate Merger Consideration") (subject to adjustment as described below), to
be  allocated among the shares  of Pryon Common Stock,  Pryon Series A Preferred
Stock, Pryon  Series B  Preferred  Stock and  Pryon  Employee Stock  Options  in
accordance  with the rights of each such class or series as set forth in Pryon's
Articles of Incorporation.  (See "Comparative Rights  of Pryon Shareholders  and
Protocol  Shareholders  --  Classes  of  Stock  --  Liquidation  Preferences and
Participation Rights" for a description of  the rights and preferences of  Pryon
Stock).  If  the Protocol  Market  Value (as  defined  below) equals  or exceeds
$12.45, each share of Pryon Preferred Stock and each share of Pryon Common Stock
will be exchanged for the  same number of shares  of Protocol Common Stock.  The
Merger  Agreement  provides  that  the Aggregate  Merger  Consideration  will be
adjusted if the Protocol  Market Value (as defined  below) is less than  $10.643
per share or greater than $13.486 per share. The "Protocol Market Value" will be
the  average of  the per  share closing  price of  Protocol Common  Stock on the
Nasdaq National Market for  the thirty (30) consecutive  trading days ending  on
June  14, 1996 as quoted in The  Wall Street Journal or other reliable financial
newspaper or publication.  If the Protocol  Market Value is  less than  $10.643,
then  the Aggregate  Merger Consideration  will be  increased to  that number of
shares of  Protocol  Common Stock  which  is equal  to  the number  obtained  by
dividing  $24,700,000 by the Protocol Market Value. If the Protocol Market Value
is more than $13.486, then the Aggregate Merger Consideration will be  decreased
to  that number of shares of Protocol Common  Stock which is equal to the number
obtained by dividing $31,300,000 by the Protocol Market Value.
 
                                       29
<PAGE>
    The following table  shows, at  various assumed Protocol  Market Values  the
total  number  of shares  of Protocol  Common  Stock that  would be  issued upon
consummation of the Merger and the number of such shares that would be issued in
respect of each share of (i) Pryon  Common Stock, (ii) Pryon Series A  Preferred
Stock and (iii) Pryon Series B Preferred Stock:
 
<TABLE>
<CAPTION>
                                                          NUMBER OF SHARES OF PROTOCOL COMMON STOCK
                                                           TO BE ISSUED IN RESPECT OF ONE SHARE OF
                                       TOTAL NUMBER OF                      PRYON
                    MARKET VALUE OF       SHARES OF      -------------------------------------------
ASSUMED PROTOCOL   AGGREGATE MERGER       PROTOCOL                           SERIES A     SERIES B
  MARKET VALUE       CONSIDERATION     COMMON STOCK TO                       PREFERRED    PREFERRED
    PER SHARE        (IN MILLIONS)      BE ISSUED(1)       COMMON STOCK        STOCK        STOCK
- -----------------  -----------------  -----------------  -----------------  -----------  -----------
<S>                <C>                <C>                <C>                <C>          <C>
    $   10.00          $    24.7            2,470,000             9.07           10.33        12.25
        10.65               24.7            2,320,843             8.52            9.71        11.50
        12.46               28.9            2,320,843             9.83            9.83         9.83
        13.48               31.3            2,320,843             9.83            9.83         9.83
        14.00               31.3            2,235,714             9.47            9.47         9.47
        15.00               31.3            2,086,667             8.84            8.84         8.84
        16.00               31.3            1,956,250             8.29            8.29         8.29
        17.00               31.3            1,841,176             7.80            7.80         7.80
        18.00               31.3            1,738,889             7.37            7.37         7.37
        19.00               31.3            1.647,368             6.98            6.98         6.98
        20.00               31.3            1,565,000             6.63            6.63         6.63
        21.00               31.3            1,490,476             6.32            6.32         6.32
        22.00               31.3            1,422,727             6.03            6.03         6.03
        23.00               31.3            1,360,870             5.77            5.77         5.77
        24.00               31.3            1,304,167             5.53            5.53         5.53
        25.00               31.3            1,252,000             5.30            5.30         5.30
        26.00               31.3            1,203,846             5.10            5.10         5.10
        27.00               31.3            1,159,259             4.91            4.91         4.91
        28.00               31.3            1,117,857             4.74            4.74         4.74
</TABLE>
 
- ------------------------
 
(1)  Includes shares  of Protocol  Common Stock  to be  issued upon  exercise of
    Replacement Options.
 
    The closing price of Protocol Common Stock  was $24.88 on May 31, 1996.  The
average  closing price of Protocol Common  Stock for the thirty (30) consecutive
trading days ending on May 31, 1996  was $21.14, which, if used as the  Protocol
Market  Value, would result  in the issuance  of 6.27 shares  of Protocol Common
Stock in exchange for each share of Pryon Stock upon consummation of the Merger.
Assuming a Protocol Market Value of  $21.14, a total of approximately  1,345,886
shares  of  Protocol  Common  Stock  and  Replacement  Options  for  a  total of
approximately 134,895  shares of  Protocol  Common Stock  would be  issued  upon
consummation  of  the Merger.  The Protocol  Common  Stock to  be issued  in the
Merger, including Protocol  Common Stock issuable  upon exercise of  Replacement
Options,  would represent  approximately 16%  of the  shares of  Protocol Common
Stock outstanding after  the Merger,  assuming a Protocol  Market Value  $21.14.
Because the number of shares of Protocol Common Stock to be issued in the Merger
is  subject to adjustment if the Protocol  Market Value is less than $10.643 per
share or greater  than $13.486 per  share, fluctuations in  the market price  of
Protocol  Common Stock during the thirty consecutive trading days ending on June
14, 1996 will impact the number of shares of Protocol Common Stock issued in the
Merger in exchange for  each share of  Pryon Stock. At any  time after June  14,
1996, shareholders of Protocol and Pryon may obtain information as to the actual
Protocol Market Value by calling Protocol at (503) 526-8500. The market value of
Protocol  Common Stock  that the Pryon  shareholders ultimately  receive will be
subject to fluctuations in the market  price of Protocol Common Stock and  could
be  more  or  less  than its  market  value  on  the date  of  this  Joint Proxy
Statement/Prospectus or more or  less than the  Protocol Market Value.  Protocol
and  Pryon  shareholders are  advised to  obtain  current market  quotations for
Protocol Common Stock.  No assurance  can be  given as  to the  market price  of
Protocol  Common Stock at any time before the Effective Time or as to the market
price of Protocol Common  Stock at any time  thereafter. If the actual  Protocol
 
                                       30
<PAGE>
Market  Value is less than  $20.00 or more than  $26.00, Protocol and Pryon will
recirculate a  supplement to  this Joint  Proxy Statement/Prospectus  containing
information  as  to the  actual Protocol  Market Value  and the  shareholders of
Protocol and Pryon will be given an opportunity to change their votes.
 
    CONVERSION OF PRYON EMPLOYEE STOCK OPTIONS IN THE MERGER.  At the  Effective
Time,  each Pryon Employee Stock Option that is outstanding immediately prior to
the Effective Time will be converted  into a Replacement Option to purchase  the
number  of shares of  Protocol Common Stock  (rounded up or  down to the nearest
whole share) equal to the  product of (i) the number  of shares of Pryon  Common
Stock  which the  option holder  would have  been entitled  to receive  had such
holder exercised the Pryon  Employee Stock Option in  full immediately prior  to
the  Effective Time (whether or  not the Pryon Employee  Stock Option would than
have been exercisable, and (ii) the Exchange Ratio. The per share exercise price
for a Replacement Option will be equal to the aggregate exercise price for  such
replaced  Pryon Employee Stock Option divided by the total number of full shares
of Protocol Common Stock  deemed to be purchasable  pursuant to the  Replacement
Option.  At  or  after the  Effective  Time, option  agreements  for Replacement
Options will  be issued  pursuant to  Protocol's 1992  Stock Incentive  Plan  to
holders  of Pryon  Employee Stock Options.  Replacement Options  will have terms
which are  substantially identical  to the  terms of  the Pryon  Employee  Stock
Options they replace.
 
    ADJUSTMENTS.   If,  prior to  the Effective  Time, Protocol  should split or
combine the  Protocol Common  Stock, or  pay  a stock  dividend or  other  stock
distribution  in Protocol Common Stock, or  otherwise change the Protocol Common
Stock into any other securities, or  make any other dividend on or  distribution
of  the Protocol  Common Stock,  then the  exchange ratio  will be appropriately
adjusted to reflect such split,  combination, dividend or other distribution  or
change.
 
    FRACTIONAL  SHARES.  No  fractional shares of Protocol  Common Stock will be
issued in the Merger.  Any fractional amount resulting  from the Merger will  be
rounded up or down to the nearest full share of Protocol Common Stock.
 
EFFECTIVE TIME OF THE MERGER
 
    Promptly  following  receipt  of  all  required  governmental  approvals and
satisfaction or waiver of the other conditions to the Merger, the Merger will be
consummated and become effective at the time at which the articles of merger  to
be  filed pursuant to the WBCA are received for filing by the Secretary of State
of the State of  Wisconsin or such later  date and time as  may be specified  in
such articles of merger. See "THE MERGER -- Conditions; Waivers."
 
EXCHANGE OF PRYON STOCK
 
    Prior  to the Closing, Protocol will select First Interstate Bank of Oregon,
N.A. or such other person or persons reasonably satisfactory to Pryon to act  as
exchange  agent for  the Merger (the  "Exchange Agent"). As  soon as practicable
after the Effective Time, (i) the Exchange Agent will deliver to each holder  of
certificates  representing shares of Pryon Stock (other than dissenting shares),
a form letter of transmittal and instruction for use in effecting the  surrender
of  such certificates  for conversion into  shares of Protocol  Common Stock and
(ii) Protocol will make  available, and the holders  of Pryon Stock (other  than
dissenting  shares) will be entitled to  receive, upon surrender to the Exchange
Agent of  one  or more  certificates  representing  shares of  Pryon  Stock  for
cancellation  and  such other  documents  reasonably requested  by  the Exchange
Agent, certificates representing the number  of shares of Protocol Common  Stock
into  which such holder's Pryon Stock is converted in the Merger, less shares to
be delivered to  the Escrow Agent  pursuant to the  Escrow Agreement. After  the
Effective  Time, certificates  representing Pryon  Stock (other  than dissenting
shares) will represent solely the right to receive Protocol Common Stock.
 
ESCROW OF PROTOCOL COMMON STOCK
 
    The Merger Agreement  provides that  Protocol will  withhold on  a pro  rata
basis ten percent (10%) of the shares of Protocol Common Stock to be received by
each  holder  of  Pryon  Stock  upon consummation  of  the  Merger  (the "Escrow
Shares"). The  Escrow Shares  will  be delivered  to  First Interstate  Bank  of
Oregon,  N.A. as escrow  agent (the "Escrow  Agent"). The Escrow  Shares will be
held by the
 
                                       31
<PAGE>
Escrow Agent for a period ending on  the first anniversary of the Closing  Date.
Subject  to certain  limitations set forth  in the Merger  Agreement, the Escrow
Shares will be  subject to  claims by  Protocol to  satisfy Pryon's  obligations
under  the  Merger  Agreement to  reimburse  Protocol  for any  and  all losses,
damages, liabilities,  costs and  expenses incurred  by Protocol  by reason  of,
arising  out  of  or  in  connection  with  any  breach  or  inaccuracy  of  any
representation or warranty  of Pryon contained  in the Merger  Agreement or  the
failure  by Pryon to perform  any agreement or covenant  required of Pryon under
the Merger Agreement.
 
QUOTATION OF PROTOCOL COMMON STOCK ON NASDAQ NATIONAL MARKET
 
    In the Merger Agreement, Protocol has  agreed to use all reasonable  efforts
to  (i) register under  the Securities Act  the shares of  Protocol Common Stock
that are to  be issued pursuant  to the  Merger Agreement and  upon exercise  of
Replacement  Options granted to employees of Pryon and (ii) cause such shares of
Protocol Common Stock to be quoted for trading on the Nasdaq National Market.
 
REPRESENTATIONS AND WARRANTIES
 
    The Merger Agreement contains various representations and warranties of  the
parties thereto. The Merger Agreement includes representations and warranties by
Pryon  as to (i) the corporate organization and qualification of Pryon, (ii) the
capitalization of  Pryon, (iii)  subsidiaries of  Pryon, (iv)  the authority  of
Pryon   to  enter  into   the  Merger  Agreement   and  the  Merger  Agreement's
noncontravention of any  agreement, law or  charter or bylaw  provision and  the
absence  of the need for governmental or third-party consents to the Merger, (v)
the accuracy  of  Pryon's financial  statements,  (vi) the  absence  of  certain
changes and events, (vii) pending and threatened litigation, (viii) the accuracy
of   information  supplied   by  Pryon  for   inclusion  in   this  Joint  Proxy
Statement/Prospectus, (ix)  the terms,  existence, operations,  liabilities  and
compliance  with applicable laws  of Pryon's employee  benefit plans and certain
other matters relating to the Employee  Retirement Income Security Act of  1974,
as amended, (x) approval of the Merger Agreement by the Pryon Board of Directors
and the Board's recommendations to shareholders to approve the Merger Agreement,
(xi) brokers, finders and financial advisors employed by Pryon, (xii) compliance
with  applicable laws, (xiii) the absence  of undisclosed liabilities, (xiv) the
payment of taxes, (xv)  the absence of defaults  on agreements, (xvi)  ownership
and  rights to use intellectual property and noninfringement on the intellectual
property rights  of  others,  (xvii) certain  accounting  matters,  (xviii)  the
absence  of  circumstances that  could result  in a  material adverse  change in
Pryon's business,  financial  condition  or results  of  operations,  (xix)  the
absence  of negotiations for the sale of Pryon to any other party, (xx) employee
nondisclosure and employment agreements, (xxi)  title to Pryon's assets,  (xxii)
Pryon's inventories and accounts receivable, (xxiii) Pryon's property, contracts
and  other  matters,  (xxiv)  Pryon's  suppliers  and  customers,  (xxv) Pryon's
products and product  warranties, (xxvi) Pryon's  compliance with  environmental
laws  and  the absence  of any  notices with  respect to  environmental matters,
(xxvii) transactions between  Pryon and  certain related  persons, (xxviii)  the
absence  of  illegal payments,  (xxix) Pryon's  business and  corporate records,
(xxx) Pryon's  insurance policies,  (xxxi) Pryon's  bank accounts,  (xxxii)  the
inapplicability  of certain takeover  provisions of Wisconsin  law, (xxxiii) the
inapplicability of the Investment Company Act to Pryon, and (xxxiv) the  absence
of  a  present intention  by  Pryon shareholders  to  dispose of  the  shares of
Protocol Common Stock to be issued pursuant to the Merger Agreement.
 
    The  Merger  Agreement  also  includes  representations  and  warranties  by
Protocol  as to  (i) the corporate  organization and  qualification of Protocol,
(ii) the capitalization of  Protocol, (iii) subsidiaries  of Protocol, (iv)  the
authority  of  Protocol  to  enter  into the  Merger  Agreement  and  the Merger
Agreement's noncontravention of any agreement, law or charter or bylaw provision
and the absence  of the need  for governmental  or third party  consents to  the
Merger, (v) the accuracy of Protocol's financial statements, (vi) the absence of
certain  changes and events, (vii) pending and threatened litigation, (viii) the
accuracy of information supplied by Protocol  for inclusion in this Joint  Proxy
Statement/Prospectus,  (ix) approval of  the Merger Agreement  by the Protocol's
Board of Directors and  the Board's recommendations  to shareholders to  approve
the  issuance  of  Protocol Common  Stock,  (x) brokers,  finders  and financial
advisors employed  by Protocol,  (xi) the  absence of  undisclosed  liabilities,
(xii)  ownership and rights to use  intellectual property and noninfringement on
the intellectual property rights of  others, (xiii) certain accounting  matters,
(xiv) the absence of
 
                                       32
<PAGE>
circumstances  that  could result  in a  material  adverse change  in Protocol's
business, financial condition or  results of operations, (xv)  the receipt of  a
fairness  opinion  from  Protocol's  financial  advisor,  (xvi)  compliance with
applicable laws, (xvii) Protocol's  suppliers and customers, (xviii)  Protocol's
products,  and  (xix)  the  inapplicability of  the  Investment  Company  Act to
Protocol.
 
BUSINESS OF PRYON PENDING THE MERGER
 
    Pryon has agreed that, prior to the Effective Time or earlier termination of
the Merger Agreement, except  as contemplated by the  Merger Agreement, it  will
conduct  its operations according to its  ordinary course of business consistent
with past practice, seek to  preserve intact its current business  organization,
keep  available the service  of its current officers  and employees and preserve
its relationship with  customers, suppliers  and others. Pryon  has also  agreed
that  prior  to the  Effective Time,  unless  Protocol agrees  in writing  or as
otherwise permitted by the Merger Agreement, it will not:
 
        (i) except for  shares of  Pryon Common  Stock issued  upon exercise  of
    Pryon  Employee Stock  Options outstanding as  of February  20, 1996, issue,
    deliver, sell, dispose  or, pledge  or otherwise encumber,  or authorize  or
    propose the issuance, sale, disposition, pledge or other encumbrance of, any
    additional  shares  of  its  capital  stock  or  any  securities  or  rights
    convertible into, exchangeable for or evidencing the right to subscribe  for
    any  shares of its capital stock, or  any other securities in respect of, in
    lieu of or in substitution for Pryon Common Stock outstanding as of February
    20, 1996;
 
        (ii) redeem,  purchase  or  otherwise acquire,  or  propose  to  redeem,
    purchase or otherwise acquire, any of its outstanding securities;
 
       (iii)  split, combine, subdivide or reclassify  any shares of its capital
    stock or declare, set  aside for payment or  pay any dividend, or  otherwise
    make any payments to shareholders in their capacity as such;
 
       (iv)  (a) grant any material increases in  the compensation of any of its
    directors, officers  or key  employees,  except in  the ordinary  course  of
    business  and consistent  with past  practice, (b) pay  or agree  to pay any
    pension,  retirement  allowance  or  other  material  employee  benefit  not
    required  or contemplated by any of the existing benefit, severance, pension
    or employment plans, agreements or arrangements as in effect on February 20,
    1996 to any such director, officer or key employee, whether past or present,
    (c) enter into any new or materially amend any existing employment agreement
    with any such director, officer or key  employee, (d) enter into any new  or
    materially  amend any existing  severance agreement with  any such director,
    officer or key employee,  or (e) except  as may be  required to comply  with
    applicable  law,  amend any  existing, or  become  obligated under  any new,
    employee plan or benefit arrangement;
 
        (v) adopt  a  plan  of complete  or  partial  liquidation,  dissolution,
    merger,    consolidation,    restructuring,   recapitalization    or   other
    reorganization of Pryon;
 
       (vi)  make  any  acquisition,  by  means  of  merger,  consolidation   or
    otherwise,  (a) of  any direct or  indirect ownership interest  in or assets
    comprising any  business  enterprise  or  operation or  (b)  except  in  the
    ordinary  course of business and consistent with past practice, of any other
    assets;
 
       (vii) adopt any amendments to the  Articles of Incorporation of Pryon  or
    the Bylaws of Pryon;
 
      (viii) other than borrowings in the ordinary course under Pryon's existing
    bank  line of credit which, together with existing borrowings, do not in the
    aggregate exceed  the  current maximum  borrowing  availability  thereunder,
    incur any indebtedness for borrowed money or guarantee any such indebtedness
    (Pryon  specifically  acknowledging and  agreeing that  it shall  not borrow
    money under its term  loan and equipment  purchase credit facilities,  other
    than  what it has already borrowed under such credit facilities), or, except
    in the ordinary course of business  and consistent with past practice,  make
    any  loans, advances  or capital  contributions to,  or investments  in, any
    other person;
 
       (ix) engage  in  the conduct  of  any business  the  nature of  which  is
    materially different from the business Pryon is currently engaged in;
 
                                       33
<PAGE>
        (x)  enter into any agreements providing  for acceleration of payment or
    performance or  other consequence  as a  result of  a change  of control  of
    Pryon;
 
       (xi)  enter into any contract, arrangement or understanding requiring the
    purchase of equipment, materials, supplies or services over a period greater
    than 12 months  and for  the expenditure of  greater than  $25,000 per  year
    which  is not cancelable without penalty on  30 days' or less notice, except
    in the ordinary course of business  for the distribution of products or  the
    production of inventory; or
 
       (xii)  authorize, recommend, propose  or announce an  intention, or enter
    into any contract, agreement,  commitment or arrangement, to  do any of  the
    foregoing.
 
CERTAIN COVENANTS OF PROTOCOL
 
    Protocol  has agreed that prior to the Effective Time or earlier termination
of the Merger Agreement, Protocol will carry on its business consistent with its
past practices,  will notify  Pryon of  the  occurrence of  any event  having  a
material  adverse effect upon its business  prospects or financial condition and
without the prior written  consent of Pryon,  will not: (i)  take any action  or
permit  any action  to be taken  other than  in the ordinary  course of business
which is inconsistent  with preserving  its existing  business organization  and
relations  with employees,  customers, suppliers and  others with whom  it has a
business relationship and  with protecting  its rights and  properties; or  (ii)
conduct  its  business other  than in  compliance with  all applicable  laws and
regulations in all material respects.
 
VOTING AGREEMENTS
 
    Certain Shareholders of Pryon owning an aggregate of 189,629 shares of Pryon
Stock  and  representing  88.4%  of   all  outstanding  Pryon  Stock  and   also
representing  79.2%, 86.6% and  98.3% of the outstanding  shares of Pryon Common
Stock, Pryon  Series A  Preferred  Stock and  Pryon  Series B  Preferred  Stock,
respectively,  have entered into an agreement with Protocol to vote all of their
shares of Pryon Stock for approval of the Merger and the Merger Agreement.  Such
shareholders  have  also agreed  that, so  long  as the  Merger Agreement  is in
effect, to vote all of their shares of Pryon Stock against any transaction other
than the  Merger,  in  any  vote or  written  consent  of  Pryon's  shareholders
concerning  any other proposed merger,  consolidation, share exchange or similar
transaction involving Pryon, or any sale of all or a significant portion of  the
assets  of or  equity interest  in Pryon,  or any  other transaction  that would
involve  the  transfer  or  potential   transfer  of  control  of  Pryon.   Such
shareholders have also agreed not to sell, transfer, assign, or otherwise convey
any  of such shareholder's  shares of Pryon  Stock, unless the  person or entity
receiving such shares of Pryon Stock becomes a party to the voting agreement.
 
NO SOLICITATION
 
    Under the Merger Agreement, Pryon has  agreed that, prior to the Closing  or
earlier  termination  of the  Merger  Agreement, neither  Pryon  nor any  of its
officers, employees,  representatives, agents  or affiliates  will, directly  or
indirectly, encourage, solicit or engage in discussions or negotiations with any
third  party  concerning any  merger, consolidation,  share exchange  or similar
transaction involving Pryon or any purchase  of all or a significant portion  of
the  assets of or equity interest in  Pryon, or any other transaction that would
involve the transfer or potential transfer of control of Pryon.
 
CONDITIONS; WAIVERS
 
    CONDITIONS TO EACH PARTY'S OBLIGATIONS TO EFFECT THE MERGER.  The respective
obligations of Pryon, Protocol and Merger  Sub to effect the Merger are  subject
to  the satisfaction or  waiver of certain  conditions, including the following:
(i) the Merger Agreement  and the transactions  contemplated thereby shall  have
been  approved and adopted by the requisite  vote of the holders of Pryon Stock,
(ii) the Issuance shall have been approved by the requisite vote of the  holders
of  Protocol Common Stock, (iii) no preliminary or permanent injunction or other
order by any  federal or state  court in  the United States  which prevents  the
consummation  of the Merger  shall have been  issued and remain  in effect, (iv)
holders of not more than 5% of the total number of shares of Pryon Common  Stock
that  would be  outstanding if all  outstanding shares of  Pryon Preferred Stock
were converted into Pryon Common  Stock shall have exercised dissenters'  rights
under applicable law, (v) the Registration
 
                                       34
<PAGE>
Statement  of which this  Joint Proxy Statement/Prospectus is  a part shall have
been declared effective and  shall be effective at  the Effective Time, no  stop
order  suspending effectiveness  of the  Registration Statement  shall have been
issued, and  no  proceeding by  the  SEC to  suspend  the effectiveness  of  the
Registration  Statement  shall  have  been  initiated  and  continuing  and  all
necessary authorizations under state securities laws and the Securities Exchange
Act shall have been received, and (vi)  prior to the filing of the  Registration
Statement,  Protocol shall have received an opinion  of KPMG Peat Marwick LLP to
the effect that the Merger will be accounted for as a pooling of interests,  and
a  letter from  Price Waterhouse  LLP, Pryon's  independent accountants,  to the
effect that, subject  to customary  qualifications, no event  has occurred  with
respect  to Pryon that would  preclude the Merger from  being accounted for as a
pooling of interests.
 
    CONDITIONS TO THE OBLIGATIONS  OF PROTOCOL AND MERGER  SUB.  The  respective
obligations  of Protocol and Merger Sub to  effect the Merger are subject to the
satisfaction or waiver of the  following additional conditions: (i) Pryon  shall
have  performed or  complied in  all material  respects with  all agreements and
conditions contained  in  the  Merger  Agreement required  to  be  performed  or
complied  with on  or prior  to the Effective  Time and  the representations and
warranties of  Pryon contained  in the  Merger Agreement  shall be  true in  all
material  respects when made and on  and as of the Effective  Time as if made on
and as  of  such  date, and  Protocol  and  Merger Sub  shall  have  received  a
certificate  of  the  President  of  Pryon to  that  effect,  (ii)  all permits,
consents, authorizations, approvals, registrations, qualifications, designations
and declarations required to  be obtained shall have  been obtained and, to  the
extent  required to be  submitted prior to  the Effective Time,  all filings and
notices required  to be  submitted shall  have been  submitted by  Pryon,  (iii)
Protocol  shall have received an opinion of  Michael Best & Friedrich, dated the
Closing Date, in substantially the form  attached to the Merger Agreement,  (iv)
Protocol  shall have received an Exchange Ratio Certificate, signed by the Chief
Financial Officer of Pryon, which  allocates the Aggregate Merger  Consideration
among the outstanding classes and series of Pryon Stock, (v) Protocol shall have
received  an opinion of KPMG Peat Marwick LLP to the effect that the Merger will
be treated  as a  reorganization within  the meaning  of Section  368(a) of  the
Internal  Revenue Code, (vi) Protocol shall have received a letter from Wessels,
Arnold &  Henderson immediately  prior to  the date  on which  this Joint  Proxy
Statement/Prospectus is mailed to Protocol shareholders and immediately prior to
the Closing Date confirming its opinion that the consideration to be paid to the
holders  of capital stock of  Pryon is fair, from a  financial point of view, to
Protocol, (vii) the  audited results of  Pryon's operations for  the year  ended
December 31, 1995 shall reflect net sales of not less than $12.2 million and net
income of not less than $775,000 and Pryon's audited balance sheet amounts as of
December  31, 1995 shall be  substantially the same as  the amounts presented on
the unaudited balance sheet  delivered to Protocol;  (viii) Protocol shall  have
had  the opportunity to review Pryon's  most recent internal unaudited financial
statements and such interim results  shall meet certain benchmarks described  in
the  Merger Agreement, (ix)  Protocol shall have received  a letter from Pryon's
Chief Financial Officer to  the effect that there  has been no material  adverse
change  in the financial condition  or results of operations  of Pryon since the
last  audited  financial  statements,  (x)  all  shareholder,  voting  or  other
agreements  with respect to  the capital stock  of Pryon, other  than the Voting
Agreement  entered  into  in  connection  with  the  Merger,  shall  have   been
terminated,   (xi)   Protocol  shall   have   received  written   evidence  that
noncompetition agreements with  Daniel F.  Carsten, Robert  M. Ricciardelli  and
Robert  M.  Sommer will  not be  affected by  the Merger  and shall  continue in
effect, and (xii) Pryon and the holders  of Pryon Stock shall have executed  and
delivered  to Protocol, an escrow agreement with respect to 10% of the shares of
Protocol Common Stock to be received by the Pryon shareholders in the Merger.
 
    CONDITIONS TO THE OBLIGATIONS OF PRYON.  The obligations of Pryon to  effect
the Merger are subject to the satisfaction or waiver of the following additional
conditions: (i) Protocol and Merger Sub shall have performed or complied with in
all material respects with all agreements and conditions contained in the Merger
Agreement required to be performed or complied with at or prior to the Effective
Time and the representations and warranties of Protocol and Merger Sub contained
in  the Merger Agreement shall be true in all material respects when made and on
and as of the Effective Time as if made  on and as of such date and Pryon  shall
have    received   a   certificate   of    the   President   of   Protocol   and
 
                                       35
<PAGE>
Merger  Sub  to  that  effect,  (ii)  all  permits,  consents,   authorizations,
approvals, registrations, qualifications, designations and declarations required
to  be obtained  shall have  been obtained,  and, to  the extent  required to be
submitted prior to the  Effective Time, all filings  and notices required to  be
submitted shall have been submitted by Protocol, (iii) Pryon shall have received
an  opinion of Ater Wynne  Hewitt Dodson & Skerritt,  dated the Closing Date, in
substantially the form attached  to the Merger Agreement,  and (iv) Pryon  shall
have  received an  opinion of Michael  Best &  Friedrich to the  effect that the
Merger will be treated as a reorganization within the meaning of Section  368(a)
of the Internal Revenue Code.
 
TERMINATION; AMENDMENT.
 
    The  Merger Agreement may be  terminated at any time  prior to the Effective
Time, before or after approval of the Pryon and Protocol shareholders by  mutual
consent  of the  Board of Directors  of Protocol  and the Board  of Directors of
Pryon. The Merger Agreement  also may be terminated:  (i) by either Protocol  or
Pryon  if  the  Merger has  not  been consummated  on  or before  July  12, 1996
(provided the  terminating party  is not  otherwise in  material breach  of  its
representations,   warranties,   covenants  or   agreements  under   the  Merger
Agreement); (ii)  by Pryon  if  any of  the  conditions to  Pryon's  obligations
described  above  have not  been met  or waived  by  Pryon at  such time  as the
condition is no longer capable of satisfaction, including the failure to  obtain
any required approval of its shareholders at a duly held meeting of shareholders
or  at an adjournment thereof (provided that  Pryon is not otherwise in material
breach of its  representations, warranties,  covenants or  agreements under  the
Merger  Agreement, which breach  is a direct  and proximate cause  of the failed
condition); (iii)  by Protocol  if  any of  the  conditions to  its  obligations
described  above have  not been met  or waived by  Protocol at such  time as the
condition is no longer capable of satisfaction, including the failure to  obtain
any required approval of its shareholders at a duly held meeting of shareholders
or  at an  adjournment thereof (provided  Protocol is not  otherwise in material
breach of its  representations, warranties,  covenants or  agreements under  the
Merger  Agreement, which breach is the direct  and proximate cause of the failed
condition; (iv) by  either of Protocol  or Pryon  if there has  been a  material
breach  on the part of the other party of any representation, warranty, covenant
or agreement set forth in the Merger Agreement, which breach has not been  cured
within fifteen business days following receipt by the breaching party of written
notice of such breach; (v) by either of Protocol or Pryon upon written notice to
the  other party if  any governmental authority  of competent jurisdiction shall
have issued  a final  permanent  order enjoining  or otherwise  prohibiting  the
consummation of the transactions contemplated by the Merger Agreement and in any
such  case the  time for  appeal or petition  for reconsideration  of such order
shall have expired without such appeal  or petition being granted. In the  event
of  termination of the Merger Agreement by  either Protocol or Pryon as provided
in the preceding sentence, the Merger  Agreement shall become void; there  shall
be no liability on the part of either Pryon, Protocol or Merger Sub.
 
    The  Merger  Agreement may  be  amended at  any  time, but  only  by written
instrument signed on behalf of each of  the parties to the Merger Agreement.  No
amendments  may be  made after such  time as  the shareholders of  Pryon and the
shareholders of Protocol have  approved the Merger  Agreement which changes  the
consideration  to be paid in the Merger or which in any way materially adversely
affects the  rights of  the shareholders  of either  Protocol or  Pryon  without
further approval of the adversely affected shareholders.
 
    At  any  time  prior  to  the Effective  Time,  the  parties  to  the Merger
Agreement, by  or  pursuant  to  action taken  by  their  respective  Boards  of
Directors  may: (i) extend the time for performance of any of the obligations of
the parties; (ii) waive any  inaccuracies in the representations and  warranties
of  any  other  party contained  in  the  Merger Agreement  or  in  any document
delivered pursuant thereto by any other  party; and (iii) waive compliance  with
any  of the agreements or conditions contained in the Merger Agreement; provided
that, no  such  waiver shall  materially  adversely  affect the  rights  of  the
shareholders  of Pryon or the  shareholders of Protocol as  the case may be. Any
agreement on the part of any party to the Merger Agreement of any such extension
or waiver shall be valid only if set forth in an instrument in writing signed on
behalf of such party.
 
                                       36
<PAGE>
INDEMNIFICATION AGREEMENTS
 
    The  Merger  Agreement  provides that  during  the period  beginning  on the
Closing Date and ending on the  second anniversary thereof, Protocol will  cause
the  the surviving corporation's articles of incorporation and bylaws to include
Pryon's current provisions regarding indemnification of officers and directors.
 
    Pryon has agreed to  indemnify and hold harmless  Protocol from and  against
and  will reimburse Protocol with respect to all losses, damages (including lost
profits and  punitive  damages),  liabilities, costs,  and  expenses  (including
reasonable   attorney  fees),  but  in   no  event  consequential,  indirect  or
speculative damages, or damages based upon  a multiple of lost (or  anticipated)
earnings,  profits,  income or  the like  ("Indemnifiable Damages")  incurred by
Protocol by reason  of or arising  out of or  in connection with  the breach  or
inaccuracy  of any representation  or warranty of Pryon  contained in the Merger
Agreement or the failure of Pryon to perform any agreement or covenant  required
by  the Merger Agreement  to be performed  by it. The  Merger Agreement provides
that (a) Pryon will not be liable for  or with respect to the first $200,000  of
the   aggregate  of  Indemnifiable  Damages,  and  (b)  if  the  Merger  closes,
Indemnifiable Damages in excess  of such $200,000 amount  shall be recovered  by
Protocol solely in accordance with the provisions of the Escrow Agreement.
 
    Protocol  has agreed to  indemnify and hold harmless  Pryon from and against
and will  reimburse Pryon  with respect  to any  and all  Indemnifiable  Damages
incurred  by Pryon  by reason  of or arising  out of  or in  connection with the
breach or inaccuracy of any representation or warranty of Protocol or Merger Sub
contained in the  Merger Agreement  or the failure  of Protocol  to perform  any
agreement  or covenant required by  the Merger Agreement to  be performed by it.
The Merger  Agreement provides  that Protocol  will not  be liable  for or  with
respect to the first $200,000 of the aggregate of Indemnifiable Damages.
 
CERTAIN FEDERAL INCOME TAX CONSIDERATIONS
 
    The   following  discussion  summarizes  the  material  federal  income  tax
considerations of the Merger that are  generally applicable to holders of  Pryon
Stock.  This  section  reflects the  tax  opinion  of Michael  Best  & Friedrich
delivered to Pryon in connection with the  Merger, which opinion is filed as  an
exhibit   to   the   Registration   Statement   of   which   this   Joint  Proxy
Statement/Prospectus is a part (the "Tax Opinion"). The Tax Opinion includes  an
opinion  to the effect that the Merger will constitute a "reorganization" within
the meaning of Section 368(a) of the  Internal Revenue Code of 1986, as  amended
(the  "Code"). The Tax Opinion is based on certain assumptions and is subject to
certain limitations and qualifications. The Tax Opinion also is based on certain
factual representations made by  Protocol, Merger Sub,  Pryon and others,  which
representations  tax counsel will neither  investigate nor verify. Of particular
importance will be certain factual  representations relating to the  "continuity
of  interest" requirement.  To satisfy  the continuity  of interest requirement,
Pryon shareholders must not, pursuant to a  plan or intent existing at or  prior
to  the Merger, dispose of or transfer so much of either (i) their capital stock
of Pryon in anticipation of the Merger  or (ii) the Protocol Common Stock to  be
received  in the  Merger (collectively,  "Planned Dispositions"),  such that the
Pryon shareholders,  as a  group,  would no  longer  have a  significant  equity
interest  in the  Pryon business being  conducted by Protocol  after the Merger.
Planned Dispositions include, among other things, shares disposed of pursuant to
the exercise of  any dissenters'  rights. While case  law may  support a  lesser
percentage,  the continuity of interest requirement will be met as long as Pryon
shareholders do not  have a  plan or intention  to sell,  exchange or  otherwise
dispose  of a number of  shares of Protocol Common  Stock received in the Merger
(taking all Planned Dispositions into account)  that would reduce the number  of
shares of Protocol Common Stock owned by such shareholders after the Merger to a
number  of shares  having a  value as  of the  date of  the Merger  less than 50
percent of the value  of all the  formerly outstanding shares  of Pryon held  by
such  shareholders as of that date. If the continuity of interest requirement is
not satisfied, the Merger would not be treated as a "reorganization."
 
    Pryon shareholders should be aware that  this discussion does not deal  with
all  federal income tax considerations that  may be relevant to particular Pryon
shareholders, in light of their particular
 
                                       37
<PAGE>
circumstances, such  as  shareholders who  are  dealers in  securities,  foreign
persons,  or shareholders  who acquired  their shares  in connection  with stock
option or  stock  purchase  plans  or in  other  compensatory  transactions.  In
addition,  the Tax Opinion does not address the tax consequences of transactions
effectuated prior to or after the  Merger (whether or not such transactions  are
in  connection with the  Merger) including, without  limitation, the exercise of
options  to  acquire  Pryon  Common   Stock  in  anticipation  of  the   Merger.
Furthermore, no foreign, state or local tax considerations are addressed herein.
The  discussion is based upon the Internal Revenue Code of 1986, as amended (the
"Code"), Treasury Regulations  thereunder, administrative  rulings and  practice
and  court decisions as of the date hereof.  All of the foregoing are subject to
change (which change could be retroactive) and any such change could affect  the
continuing  validity  of  the Tax  Opinion.  The Internal  Revenue  Service (the
"Service") has not been asked to rule upon the tax consequences of the Merger to
any person and no such request will  be made. Unlike a ruling from the  Service,
an  opinion  of counsel  is  not binding  on  the Service  and  there can  be no
assurance, and none is hereby  given that the Service  will not take a  position
contrary  to one or more positions reflected herein or that the Tax Opinion will
be upheld  by  the courts  if  challenged  by the  Service.  Accordingly,  PRYON
SHAREHOLDERS  AND OPTION HOLDERS ARE URGED TO  CONSULT THEIR OWN TAX ADVISORS AS
TO THE  SPECIFIC  TAX  CONSEQUENCES  OF THE  MERGER,  INCLUDING  THE  APPLICABLE
FEDERAL, STATE, LOCAL AND FOREIGN TAX CONSEQUENCES TO THEM OF THE MERGER.
 
    Subject  to the limitations  and qualifications described  herein and in the
Tax Opinion, the  Merger qualifies  as a  reorganization within  the meaning  of
Section 368 of the Code, and the following tax consequences will result:
 
        (1)  No gain or loss  will be recognized by  holders of capital stock of
    Pryon upon their receipt in the Merger of Protocol Common Stock in  exchange
    therefor;
 
        (2) The aggregate tax basis of the Protocol Common Stock received in the
    Merger  will be the same  as the aggregate tax  basis of Pryon capital stock
    surrendered in exchange therefor;
 
        (3) The holding  period of  the Protocol  Common Stock  received in  the
    Merger  will include  the period  for which  the Pryon  Stock surrendered in
    exchange therefor was held, provided that the Pryon capital stock is held as
    a capital asset at the time of the Merger;
 
        (4) A shareholder  who exercises  dissenters' rights with  respect to  a
    share  of  Pryon Stock  and receives  payment  for such  share in  cash will
    generally recognize gain or loss  for federal income tax purposes,  measured
    by the difference between the holder's basis in such share and the amount of
    cash  received, provided that the  payment is neither essentially equivalent
    to a dividend  within the meaning  of Section 302  of the Code  nor has  the
    effect  of  a  distribution of  a  dividend  within the  meaning  of Section
    356(a)(2) of the Code (collectively, a "Dividend Equivalent Transaction"). A
    sale of  Pryon Stock  pursuant to  an exercise  of dissenters'  rights  will
    generally  not be a Dividend Equivalent Transaction  if, as a result of such
    exercise, the shareholder  exercising dissenters' rights  owns no shares  of
    Protocol  Common Stock (either actually or constructively within the meaning
    of Section 318 of the  Code). If however, a  shareholder's sale for cash  of
    Pryon  Stock pursuant  to an  exercise of  dissenters' rights  is a Dividend
    Equivalent Transaction,  then  such  shareholder  will  generally  recognize
    income  for federal income tax purposes in an amount up to the entire amount
    of cash so received.
 
    A successful challenge by the Service to the "reorganization" status of  the
Merger  (as a result of a failure of the "continuity of interest" requirement or
otherwise) would result  in a Pryon  shareholder recognizing gain  or loss  with
respect to each share of Pryon Stock surrendered equal to the difference between
the  shareholder's  basis  in such  share  and  the fair  market  value,  as the
Effective Time, of the Protocol Common  Stock received in exchange therefor.  In
such  event, a  shareholder's aggregate  basis in  the Protocol  Common Stock so
received would equal its fair market value and the holding period for such stock
would begin the day after the Merger.
 
                                       38
<PAGE>
    THE FOREGOING DISCUSSION IS  INTENDED ONLY AS A  SUMMARY OF CERTAIN  FEDERAL
INCOME  TAX CONSEQUENCES  OF THE MERGER  AND DOES  NOT PURPORT TO  BE A COMPLETE
ANALYSIS OR LISTING OF ALL POTENTIAL TAX EFFECTS RELEVANT TO A DECISION  WHETHER
TO  VOTE  IN FAVOR  OF APPROVAL  AND ADOPTION  OF THE  MERGER AGREEMENT  AND THE
MERGER. THE  DISCUSSION  DOES NOT  ADDRESS  THE  TAX CONSEQUENCES  THAT  MAY  BE
RELEVANT  TO A PARTICULAR  PRYON SHAREHOLDER SUBJECT  TO SPECIAL TREATMENT UNDER
CERTAIN FEDERAL INCOME TAX LAWS, SUCH AS DEALERS IN SECURITIES, BANKS, INSURANCE
COMPANIES, TAX-EXEMPT ORGANIZATIONS, NON-UNITED STATES PERSONS AND  SHAREHOLDERS
WHO  ACQUIRED THEIR  SHARES OF  PRYON COMMON STOCK  PURSUANT TO  THE EXERCISE OF
PRYON STOCK  OPTIONS OR  OTHERWISE  AS COMPENSATION,  NOR  DOES IT  ADDRESS  ANY
CONSEQUENCES   ARISING  UNDER  THE  LAWS  OF  ANY  STATE,  LOCALITY  OR  FOREIGN
JURISDICTION. THE  DISCUSSION  IS  BASED UPON  THE  CODE,  TREASURY  REGULATIONS
THEREUNDER AND ADMINISTRATIVE RULINGS AND PRACTICE AND COURT DECISIONS AS OF THE
DATE  HEREOF, ALL OF THE FOREGOING ARE  SUBJECT TO CHANGE (WHICH CHANGE COULD BE
RETROACTIVE) AND ANY SUCH  CHANGE COULD AFFECT THE  CONTINUING VALIDITY OF  THIS
DISCUSSION.  PRYON  SHAREHOLDERS ARE  URGED TO  CONSULT  THEIR OWN  TAX ADVISORS
CONCERNING THE FEDERAL, STATE, LOCAL AND FOREIGN TAX CONSEQUENCES OF THE  MERGER
TO THEM.
 
RESALE OF PROTOCOL COMMON STOCK ISSUED IN THE MERGER; AFFILIATES
 
    The  Protocol Common Stock to be  issued to Pryon shareholders in connection
with the Merger will be freely transferable under the Securities Act, except for
Protocol Common Stock issued to  any person deemed to  be an affiliate of  Pryon
for  purposes  of  Rule 145  under  the  Securities Act  at  the  Effective Time
("Affiliates"). Affiliates may not sell their Protocol Common Stock acquired  in
connection  with  the  Merger  except  pursuant  to  an  effective  registration
statement under the Securities Act covering  such shares, or in compliance  with
Rule  145 promulgated under  the Securities Act  or another applicable exemption
from the registration requirements of the Securities Act. Pryon has delivered  a
disclosure statement to Protocol identifying all persons who may be deemed to be
Affiliates. Each Affiliate listed in that disclosure statement has agreed not to
sell, transfer or otherwise dispose of any Protocol Common Stock received in the
Merger  in violation of  the Securities Act,  and that such  Affiliate will not,
after the earlier of  (i) the mailing of  this Joint Proxy  Statement/Prospectus
and (ii) the thirtieth day prior to the Effective Time, sell any Protocol Common
Stock  or any shares  of Pryon Stock  or otherwise reduce  such Affiliate's risk
relative to any  Protocol Common  Stock until  after such  time as  consolidated
financial  statements which reflect  at least 30  days of post-Merger operations
have been  published  by  Protocol,  except as  permitted  by  Staff  Accounting
Bulletin No. 76 issued by the Commission.
 
ACCOUNTING TREATMENT
 
    It is expected that the Merger will be treated as a pooling of interests for
accounting  and  financial reporting  purposes. See  "THE MERGER  -- Conditions;
Waivers."
 
MANAGEMENT AND OPERATIONS OF PRYON AFTER THE MERGER
 
    After the Merger,  the articles of  incorporation and bylaws  of Merger  Sub
will  be the  articles of  incorporation and  bylaws of  Pryon as  the Surviving
Corporation (except that  the name  will be  changed to  Pryon Corporation)  and
Pryon  will be a wholly owned subsidiary  of Protocol. Pryon will operate as one
of Protocol's business units, and Protocol currently intends to maintain Pryon's
corporate headquarters in  Menomonee Falls, Wisconsin.  After the Merger,  Pryon
will  have access to resources generally  available to Protocol's other business
units, will participate in appropriate  activities with other Protocol  business
units  and will  operate under the  direction and guidance  of Protocol's senior
management and the Protocol and Pryon Boards.
 
EXPENSES AND FEES
 
    Protocol and Pryon will each pay  their own expenses in connection with  the
Merger.
 
                                       39
<PAGE>
RIGHTS OF DISSENTING PRYON SHAREHOLDERS
 
    The  following is a brief summary of the rights of shareholders of Pryon who
dissent from the Merger.  It is qualified  in its entirety  by reference to  the
applicable statutory provisions of the WBCL attached hereto as Appendix C. Under
the  OBCA, holders of Protocol Common Stock  will not be entitled to dissenters'
rights as  a  result  of  the  Merger because  Protocol  is  not  a  constituent
corporation to the Merger.
 
    If  the Merger  is consummated,  holders of  record of  Pryon Stock  who (a)
deliver to Pryon  before the vote  is taken  written notice of  their intent  to
demand  payment if the Merger Agreement is  approved, (b) refrain from voting in
favor of the  Merger Agreement,  by either voting  against the  adoption of  the
Merger  Agreement or abstaining from voting,  and (c) comply with the provisions
of Sections 180.1301 through 180.1331 of the WBCL, will then be entitled to have
the "fair value" of their shares at the time of the Merger paid to them.
 
    The following is a  brief summary of Sections  180.1301 through 180.1331  of
the  WBCL, which sets  forth the procedures  for demanding statutory dissenters'
rights. This  summary is  qualified in  its entirety  by reference  to  Sections
180.1301  through 180.1331 of the WBCL, the  text of which is attached hereto in
Appendix C.
 
    If the Merger is approved and  consummated, those shareholders of Pryon  who
elect  to exercise their dissenters' rights  and who properly and timely perfect
such rights will  be entitled  to receive  the "fair  value" in  cash for  their
shares  of Pryon Stock. Pursuant to Section  180.1301(4) of the WBCL, such "fair
value" means the value of the shares immediately before the effectuation of  the
Merger,  excluding  any  appreciation  or depreciation  in  anticipation  of the
Merger, unless such exclusion would be inequitable.
 
    A shareholder who  elects to  exercise his  or her  dissenters' rights  must
perfect  such rights  by delivering to  Pryon prior  to the vote  at the Special
Meeting written notice of his or her intent to demand payment, and not vote  his
or  her shares in  favor of the  Merger Agreement, by  either voting against the
adoption of the Merger Agreement or abstaining from voting.
 
    If  a  shareholder  fails  to  deliver  written  notice  to  Pryon  of   the
shareholder's  intent to demand payment prior to the vote at the Special Meeting
or if the shareholder votes his or her shares in favor of the Merger  Agreement,
such  shareholder will lose  the right to receive  the fair value  of his or her
shares.
 
    If the Merger is approved, within  ten days after such approval, Pryon  will
deliver  to those shareholders  who deliver to  Pryon prior to  the vote written
notice of their intent to demand payment and who refrain from voting in favor of
the Merger Agreement  a written dissenters'  notice (the "Dissenters'  Notice").
The  Dissenters'  Notice shall  set forth  where the  shareholder must  send the
payment demand, where and  when certificates for such  shares must be  deposited
and the date by which Pryon must receive the payment demand (which date must not
be  fewer  than 30  days nor  more  that 60  days after  the  date on  which the
Dissenters' Notice  is  delivered). In  addition,  the Dissenters'  Notice  must
include  (a) a form for  demanding payment which includes  the date of the first
announcement to the  shareholders of the  terms of the  Merger and requires  the
shareholder  to certify whether  he or she acquired  beneficial ownership of the
shares before that date, and (b) a  copy of the sections of the WBCL  pertaining
to dissenters' rights.
 
    A  shareholder  who is  sent  a Dissenters'  Notice  must demand  payment in
writing, certifying  whether he  or  she acquired  beneficial ownership  of  the
shares  before  the  date  specified  in such  notice  and  deposit  his  or her
certificates in accordance with the  Dissenters' Notice. A shareholder who  does
not  demand payment by  the date set in  the Dissenters' Notice  or who does not
deposit his  or her  certificates where  required and  by the  date set  in  the
Dissenter's  Notice is not entitled to a dissenters' right of payment for his or
her shares.
 
                                       40
<PAGE>
    Upon the  later of  consummation of  the Merger  or receipt  of the  payment
demand,  Pryon shall pay each shareholder who has complied with the requirements
set forth above the  amount that Pryon  estimates to be the  fair value of  such
shares,  plus accrued  interest. The payment  must be accompanied  by the latest
available financial statements of Pryon, a statement of the estimate of the fair
value of  the shares,  an explanation  of  how the  interest was  calculated,  a
statement  of the dissenters'  rights if the dissenter  is dissatisfied with the
payment and a copy of the sections of the WBCL pertaining to dissenters' rights.
 
    If (a) the dissenter believes that the amount paid by Pryon is less than the
fair value  of  his or  her  shares or  that  the interest  due  is  incorrectly
calculated, (b) Pryon fails to make payment within 60 days after the date set in
the  Dissenters'  Notice  for  demanding  payment,  or  (c)  the  Merger  is not
consummated  and  Pryon  does  not   return  to  the  dissenter  the   deposited
certificates  within 60 days  after the date  set in the  Dissenters' Notice for
demanding payment, the dissenter may notify Pryon of his or her estimate of  the
fair  value of  his or  her shares  and the  amount of  interest due  and demand
payment of  his or  her  estimate, less  any  payment previously  received.  The
dissenter must notify Pryon of his or her demand in writing within 30 days after
Pryon  made or offered  payment for the  dissenters' shares. If,  within 60 days
after receipt  by Pryon  of a  demand described  in this  paragraph, the  demand
remains unsettled, Pryon shall bring a special proceeding and shall petition the
court to determine the fair value of the shares and accrued interest thereon. If
Pryon  does not bring the special proceeding within such 60-day period, it shall
pay each  dissenter whose  demand  remains unsettled  the amount  demanded.  The
dissenter  shall be entitled to judgment for the amount by which the court finds
the fair value of  his or her  shares plus interest exceeds  the amount paid  by
Pryon.
 
    The  Merger Agreement provides that it may  be terminated by Protocol in the
event that holders of more than 5% of the total number of shares of Pryon Common
Stock that would  be outstanding if  all outstanding shares  of Pryon  Preferred
Stock were converted into Pryon Common Stock exercise dissenters' rights.
 
                             CONFLICTS OF INTEREST
 
    PRYON   BOARD  OF  DIRECTORS  AND  MANAGEMENT.    As  of  the  Record  Date,
non-employee directors of  the Pryon  Board beneficially owned  an aggregate  of
116,797  shares  of  Pryon  Stock.  See "STOCK  OWNED  BY  PRYON  MANAGEMENT AND
PRINCIPAL SHAREHOLDERS." Assuming a Protocol Market Value of $13.48 per share or
more, the aggregate  dollar value  of Protocol Common  Stock to  be received  by
these  non-employee directors  in respect of  outstanding shares  of Pryon Stock
would be  approximately $15,489,143,  representing  approximately 49.5%  of  the
aggregate  consideration to be received by all  holders of Pryon Stock and Pryon
Employee Stock Options.
 
    As of the Record Date, the executive officers of Pryon owned an aggregate of
42,740 shares of Pryon Stock and held options to acquire 13,100 shares of  Pryon
Common  Stock, exercisable at prices ranging from  $2.00 to $8.00 per share. See
"STOCK OWNED  BY  PRYON  MANAGEMENT  AND  PRINCIPAL  SHAREHOLDERS."  Assuming  a
Protocol Market Value of $13.48 per share or more, the aggregate dollar value of
Protocol  Common Stock to be received by  these executive officers in respect of
outstanding  shares   of  Pryon   Stock  would   be  approximately   $5,668,179,
representing  approximately 18.1% of the  aggregate consideration to be received
by all holders of Pryon Stock and Pryon Employee Stock Options. Pursuant to  the
Merger  Agreement, all outstanding Pryon Employee Stock Options, including those
held by the executive officers of  Pryon, will convert into Replacement  Options
to  acquire Protocol  Common Stock. See  "THE MERGER  -- Terms of  the Merger --
Conversion of Pryon Employee Stock Options  in the Merger." Assuming a  Protocol
Market Value of $13.48 per share or more, the aggregate dollar value of Protocol
Common Stock issuable upon the exercise of Replacement Options to be received by
the executive officers would be approximately $1,737,322.
 
    Pryon  is indebted to each of Daniel  F. Carsten, Robert H. Ricciardelli and
Robert M. Sommer, which  indebtedness is evidenced by  a Pryon Promissory  Note,
each  dated July 1,  1995, and each  in the principal  amount of $75,429.00 (the
"Promissory   Notes"),   plus   any    accrued   and   unpaid   interest.    The
 
                                       41
<PAGE>
indebtedness  evidenced  by  the  Promissory  Notes  is  subordinate  to certain
indebtedness of  Pryon  to  its  senior bank  lender.  Pursuant  to  the  Merger
Agreement,  Protocol has committed  at or within  ten days after  the Closing to
cause Pryon to pay in full each  of the Promissory Notes. In addition,  officers
and employees of Pryon will become eligible for option grants under the Protocol
1992 Plan.
 
                                       42
<PAGE>
                     UNAUDITED PRO FORMA COMBINED CONDENSED
                              FINANCIAL STATEMENTS
 
    The   following  Unaudited  Pro  Forma   Combined  Condensed  Statements  of
Operations and Balance Sheet give effect to the Merger on a pooling of interests
basis of  accounting. These  Unaudited Pro  Forma Combined  Condensed  Financial
Statements  have  been  prepared  from  the  historical  consolidated  financial
statements of Protocol and  Pryon and should be  read in conjunction  therewith.
The  historical financial statements  of Protocol and of  Pryon are contained or
incorporated  by  reference  in  this  Joint  Proxy  Statement/Prospectus.   See
"FINANCIAL STATEMENTS" and "AVAILABLE INFORMATION."
 
    This  unaudited pro forma combined information is not necessarily indicative
of actual or  future operating  results or  financial position  that would  have
occurred or will occur upon consummation of the Merger.
 
    The Unaudited Pro Forma Combined Condensed Balance Sheet gives effect to the
Merger  as if it had occurred on March 31, 1996, combining the balance sheets of
Protocol and Pryon as of that  date. The Unaudited Pro Forma Combined  Condensed
Statements  of Operations  give effect to  the Merger  as if it  had occurred on
January 1, 1993, combining  the results of  Protocol and Pryon  for each of  the
three  years in the period ended December 31,  1995, and each of the three month
periods ended March 31, 1996 and 1995.
 
              UNAUDITED PRO FORMA COMBINED CONDENSED BALANCE SHEET
                              AS OF MARCH 31, 1996
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                                            PRO FORMA
                                                                 HISTORICAL       ------------------------------
                                                            --------------------   ADJUSTMENTS (NOTE
                                                            PROTOCOL     PRYON            4)           COMBINED
                                                            ---------  ---------  -------------------  ---------
                                                                  (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                                         <C>        <C>        <C>                  <C>
Current assets
  Cash....................................................  $  12,082  $      10                       $  12,092
  Short term investments..................................      3,034          0                           3,034
  Accounts receivable -- net..............................     12,587      1,778       $    (206)         14,159
  Inventories.............................................      6,578      3,844            (181)         10,241
  Deferred income taxes...................................      1,333          0             240           1,573
  Other current assets....................................        269        221                             490
                                                            ---------  ---------         -------       ---------
    Total current assets..................................     35,883      5,853            (147)         41,589
Long term investments.....................................     11,315          0                          11,315
Property and equipment
  Machinery and equipment.................................      5,728      2,112                           7,840
  Office furniture and fixtures...........................      1,001        943                           1,944
  Leasehold improvements..................................        237        404                             641
                                                            ---------  ---------                       ---------
    Total.................................................      6,966      3,459                          10,425
  Less: accumulated depreciation..........................     (4,700)    (1,696)                         (6,396)
                                                            ---------  ---------                       ---------
    Net property and equipment............................      2,266      1,763                           4,029
Other assets
  Capitalized software -- net.............................        231        251                             482
  Other...................................................      1,734          0                           1,734
                                                            ---------  ---------                       ---------
    Total other assets....................................      1,965        251                           2,216
                                                            ---------  ---------         -------       ---------
    Total assets..........................................  $  51,429  $   7,867       $    (147)      $  59,149
                                                            ---------  ---------         -------       ---------
                                                            ---------  ---------         -------       ---------
</TABLE>
 
   See accompanying notes to Unaudited Pro Forma Combined Condensed Financial
                                   Statements
 
                                       43
<PAGE>
              UNAUDITED PRO FORMA COMBINED CONDENSED BALANCE SHEET
                              AS OF MARCH 31, 1996
                      LIABILITIES AND SHAREHOLDERS' EQUITY
 
<TABLE>
<CAPTION>
                                                                                            PRO FORMA
                                                                 HISTORICAL       ------------------------------
                                                            --------------------   ADJUSTMENTS (NOTE
                                                            PROTOCOL     PRYON            4)           COMBINED
                                                            ---------  ---------  -------------------  ---------
                                                                  (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                                         <C>        <C>        <C>                  <C>
Current liabilities
  Current portion -- long term debt.......................  $       0  $      88                       $      88
  Accounts payable........................................      2,242        824       $    (206)          2,860
  Accrued salaries, etc...................................      2,049         34                           2,083
  Income taxes payable....................................        972          0                             972
  Reserve for warranties..................................        915        155                           1,070
  Deferred revenue........................................        139          0                             139
  Other...................................................        712        126           1,600           2,438
                                                            ---------  ---------         -------       ---------
    Total current liabilities.............................      7,029      1,227           1,394           9,650
Long-term debt
  Line of credit..........................................          0      1,571                           1,571
  Notes payable -- shareholders...........................          0        226                             226
  Notes payable -- bank...................................          0        175                             175
                                                            ---------  ---------         -------       ---------
    Total long-term debt..................................          0      1,972                           1,972
Deferred income taxes.....................................        444          0                             444
Series A Redeemable Preferred Stock.......................          0      1,888          (1,888)              0
Series B Redeemable Preferred Stock.......................          0      4,849          (4,849)              0
Shareholders' equity......................................
  Common stock (Shares outstanding -- Protocol: 7,424;
   Pryon: 102; Adjustments: 1,286; Pro Forma Combined:
   8,812).................................................         74         10               4              88
  Additional paid-in capital..............................     27,965          1           6,225          34,191
  Unrealized holding gain on investments..................         23          0                              23
  Retained earnings/(Accumulated deficit).................     15,948     (1,572)         (1,541)         12,835
  Foreign currency translation adjustment.................        (54)         0                             (54)
  Less: treasury stock (Pryon -- 27 shares)...............          0       (508)            508               0
                                                            ---------  ---------         -------       ---------
    Total shareholders' equity............................     43,956     (2,069)          5,196          47,083
                                                            ---------  ---------         -------       ---------
Total liabilities and shareholders' equity................  $  51,429  $   7,867       $    (147)      $  59,149
                                                            ---------  ---------         -------       ---------
                                                            ---------  ---------         -------       ---------
Ending number of common and common equivalent shares
 outstanding..............................................      8,072         75           1,445           9,592
Book value per common and common equivalent share.........       5.45     (27.44)                           4.91
</TABLE>
 
   See accompanying notes to Unaudited Pro Forma Combined Condensed Financial
                                   Statements
 
                                       44
<PAGE>
        UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENTS OF OPERATIONS
                          FOR YEARS ENDED DECEMBER 31
 
<TABLE>
<CAPTION>
                                                    HISTORICAL -- PROTOCOL             HISTORICAL -- PRYON
                                                -------------------------------  -------------------------------
                                                  1995       1994       1993       1995       1994       1993
                                                ---------  ---------  ---------  ---------  ---------  ---------
                                                            (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                             <C>        <C>        <C>        <C>        <C>        <C>
Sales.........................................  $  49,067  $  41,166  $  37,132  $  12,276  $   8,001  $   7,240
Cost of sales.................................     22,194     18,172     16,392      7,242      5,435      5,213
                                                ---------  ---------  ---------  ---------  ---------  ---------
    Gross profit..............................     26,873     22,994     20,740      5,034      2,566      2,027
Operating expenses:
  Research and development....................      6,190      4,780      3,936      1,529      1,353      1,140
  Selling, general and administrative.........     15,588     13,555     12,563      2,492      1,856      1,116
                                                ---------  ---------  ---------  ---------  ---------  ---------
    Total operating expenses..................     21,778     18,335     16,499      4,021      3,209      2,256
                                                ---------  ---------  ---------  ---------  ---------  ---------
  Income (loss) from operations...............      5,095      4,659      4,241      1,013       (643)      (229)
Other income (expense):
  Interest income.............................      1,159        817        768          5          5         16
  Interest expense............................          0          0        (20)      (186)      (146)       (51)
  Other.......................................        (48)       (19)         9        (14)       (10)         0
                                                ---------  ---------  ---------  ---------  ---------  ---------
    Total other income (expense)..............      1,111        798        757       (195)      (151)       (35)
                                                ---------  ---------  ---------  ---------  ---------  ---------
Income (loss) before income taxes.............      6,206      5,457      4,998        818       (794)      (264)
Provision for income taxes....................      1,528      1,311      1,590          0          0          0
                                                ---------  ---------  ---------  ---------  ---------  ---------
Income (loss) before cumulative effect of
 change in accounting principle...............      4,678      4,146      3,408        818       (794)      (264)
Cumulative effect of change in accounting
 principle....................................          0          0        100          0          0          0
                                                ---------  ---------  ---------  ---------  ---------  ---------
    Net income (loss).........................  $   4,678  $   4,146  $   3,508  $     818  $    (794) $    (264)
                                                ---------  ---------  ---------  ---------  ---------  ---------
                                                ---------  ---------  ---------  ---------  ---------  ---------
Weighted average number of common and common
 equivalent shares outstanding................      7,701      7,456      7,459        225         75         75
Net income (loss) per common and common
 equivalent share before cumulative effect of
 change in accounting principle...............       0.61       0.56       0.46       3.65     (10.55)     (3.51)
Net income (loss) per common and common
 equivalent share.............................       0.61       0.56       0.47       3.65     (10.55)     (3.51)
</TABLE>
 
   See accompanying notes to Unaudited Pro Forma Combined Condensed Financial
                                   Statements
 
                                       45
<PAGE>
        UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENTS OF OPERATIONS
                          FOR YEARS ENDED DECEMBER 31
 
<TABLE>
<CAPTION>
                                                    PRO FORMA-ADJUSTMENTS             PRO FORMA-COMBINED
                                               -------------------------------  -------------------------------
                                                 1995       1994       1993       1995       1994       1993
                                               ---------  ---------  ---------  ---------  ---------  ---------
                                                           (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                            <C>        <C>        <C>        <C>        <C>        <C>
Sales........................................  $  (1,741) $  (1,009) $  (1,045) $  59,602  $  48,158  $  43,327
Cost of sales................................     (1,643)    (1,092)      (856)    27,793     22,515     20,749
                                               ---------  ---------  ---------  ---------  ---------  ---------
  Gross profit...............................        (98)        83       (189)    31,809     25,643     22,578
Operating expenses:
  Research and development...................                                       7,719      6,134      5,076
  Selling, general and administrative........                                      18,080     15,411     13,679
                                                                                ---------  ---------  ---------
    Total operating expenses.................                                      25,799     21,545     18,755
                                               ---------  ---------  ---------  ---------  ---------  ---------
  Income (loss) from operations..............        (98)        83       (189)     6,010      4,098      3,823
Other income (expense)
  Interest income............................                                       1,164        822        784
  Interest expense...........................                                        (186)      (146)       (72)
  Other......................................                                         (62)       (29)         9
                                                                                ---------  ---------  ---------
    Total....................................                                         916        647        721
                                               ---------  ---------  ---------  ---------  ---------  ---------
Income (loss) before income taxes............        (98)        83       (189)     6,926      4,745      4,544
Provision for income taxes...................          0          0          0      1,528      1,311      1,590
                                               ---------  ---------  ---------  ---------  ---------  ---------
Income (loss) before cumulative effect of
 change in accounting principle..............        (98)        83       (189)     5,398      3,434      2,954
Cumulative effect of change in accounting
 principle...................................                                                      0        100
                                               ---------  ---------  ---------  ---------  ---------  ---------
  Net income (loss)..........................  $     (98) $      83  $    (189) $   5,398  $   3,434  $   3,054
                                               ---------  ---------  ---------  ---------  ---------  ---------
                                               ---------  ---------  ---------  ---------  ---------  ---------
Weighted average number of common and common
 equivalent shares outstanding...............      1,278      1,297      1,283      9,204      8,828      8,817
Net income per common and common equivalent
 share before cumulative effect of change in
 accounting principle........................                                        0.59       0.39       0.34
Net income per common and common equivalent
 share.......................................                                        0.59       0.39       0.35
</TABLE>
 
   See accompanying notes to Unaudited Pro Forma Combined Condensed Financial
                                   Statements
 
                                       46
<PAGE>
        UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENTS OF OPERATIONS
                        FOR THREE MONTHS ENDED MARCH 31,
 
<TABLE>
<CAPTION>
                                                                                         PRO FORMA-       PRO FORMA- COMBINED
                                        HISTORICAL-PROTOCOL     HISTORICAL-PRYON        ADJUSTMENTS
                                        --------------------  --------------------  --------------------  --------------------
                                          1996       1995       1996       1995       1996       1995       1996       1995
                                        ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                     <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
                                                               (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
Sales.................................  $  13,789  $  10,176  $   3,135  $   3,059  $    (685) $    (291) $  16,239  $  12,944
Cost of Sales.........................      6,308      4,579      1,755      1,791       (708)      (264)     7,355      6,106
                                        ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Gross profit........................      7,481      5,597      1,380      1,268         23        (27)     8,884      6,838
Operating expenses:
  Research and development............      1,795      1,695        459        369                            2,254      2,064
  Selling, general and
   administrative.....................      4,083      3,465        666        528                            4,749      3,993
                                        ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
      Total operating expenses........      5,878      5,160      1,125        897          0          0      7,003      6,057
                                        ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Income from operations..............      1,603        437        255        371         23        (27)     1,881        781
Other income (expenses)
  Interest income.....................        329        277          2          1                              331        278
  Interest expense....................          0          0        (50)       (43)                             (50)       (43)
  Other...............................         (9)       (20)        (5)         9                              (14)       (11)
                                        ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
      Total...........................        320        257        (53)       (33)         0          0        267        224
                                        ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Income before income taxes............      1,923        694        202        338         23        (27)     2,148      1,005
Provision for income taxes............        595        192          0          0                              595        192
                                        ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Net income..........................  $   1,328  $     502  $     202  $     338  $      23  $     (27) $   1,553  $     813
                                        ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                        ---------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
Weighted average number of common and
 common equivalent shares
 outstanding..........................      8,042      7,632        227        227      1,293      1,278      9,562      9,137
Net income per common and common
 equivalent share.....................       0.17       0.07       0.89       1.49                             0.16       0.09
</TABLE>
 
   See accompanying notes to Unaudited Pro Forma Combined Condensed Financial
                                  Statements.
 
                                       47
<PAGE>
                     NOTES TO UNAUDITED PRO FORMA COMBINED
                         CONDENSED FINANCIAL STATEMENTS
 
NOTE 1. -- BASIS OF PRESENTATION
    The Unaudited Pro Forma Combined  Condensed Financial Statements reflect  an
assumed  exchange ratio of 6.4693 shares of  Protocol Common Stock for one share
of Pryon  Stock. The  assumed exchange  ratio is  based on  an assumed  Protocol
Market  Value of $20.50, which was the closing price of Protocol Common Stock on
May 10, 1996. At the assumed exchange ratio, 1,387,742 shares of Protocol Common
Stock would  be  exchanged  for  214,512  shares  of  Pryon  Stock  and  139,090
Replacement  Options would  be exchanged  for 21,500  options to  purchase Pryon
Common Stock  upon completion  of the  Merger. The  actual number  of shares  of
Protocol Common Stock and Replacement Options to be issued will be determined at
the Effective Time of the Merger based upon the Protocol Market Value.
 
NOTE 2. -- PRO FORMA EARNINGS PER SHARE
    Net  income per common and common equivalent  share amounts are based on the
weighted average  number  of  common  shares  outstanding  and  dilutive  common
equivalent shares assumed to be outstanding during the period using the treasury
stock  method, giving effect to the Merger as  if it had been consummated at the
beginning of the years presented at the assumed exchange ratio described in Note
1. The Replacement Options described in Note 1 are considered to be common stock
equivalents for purposes of  calculating the weighted  average number of  common
and dilutive common equivalent shares outstanding.
 
NOTE 3. -- TRANSACTION COSTS
    Protocol  and Pryon estimate that they  will incur direct and indirect costs
of $1.6 million  in connection with  the Merger, relating  mainly to  investment
banker  fees and legal and accounting services. These nonrecurring costs will be
charged to operations in the fiscal quarter in which the Merger is  consummated.
The  Unaudited  Pro  Forma  Combined  Condensed  Balance  Sheet  reflects  these
estimated transaction costs and their tax effects as if such costs were incurred
as of March 31, 1996,  but the effects of these  costs are not reflected in  the
Unaudited Pro Forma Combined Condensed Statements of Operations.
 
NOTE 4. -- CONFORMING ADJUSTMENTS AND INTERCOMPANY TRANSACTIONS.
    There  have been no adjustments required  to conform the accounting policies
of the  combined company.  Intercompany  transactions, reflecting  purchases  of
products  and services by Protocol from Pryon during the years presented and the
resulting accounts receivable  and payable  balances, are  eliminated under  the
column heading "Pro Forma -- Adjustments".
 
                                       48
<PAGE>
                              BUSINESS OF PROTOCOL
 
    Protocol  designs, manufactures  and markets  patient monitoring instruments
and systems utilizing innovative design, advanced software concepts and  leading
electronic  technology. Protocol's  products are designed  to address hospitals'
needs  for  more  efficient  and  flexible  utilization  of  patient  monitoring
equipment.  Protocol's Propaq monitors  combine multiple physiologic measurement
and display capabilities  into a single  lightweight instrument, permitting  the
use  of  the monitor  in a  variety  of hospital  settings. Propaq  monitors are
available in  a  variety of  configurations  and can  measure  electrocardiogram
(ECG); blood pressure, both invasively and non-invasively; arterial blood oxygen
saturation   level  (pulse   oximetry);  respiration   (impedance  pneumography)
end-tidal carbon dioxide, and body temperature.  The Propaq monitor can also  be
configured  to receive  wireless communication  of ECG  signals from  a portable
transmitter. The  Acuity  System  further increases  monitoring  flexibility  by
allowing  a clinician  to observe and  control up  to 32 Propaq  monitors from a
dedicated UNIX-based workstation.
 
                               BUSINESS OF PRYON
 
GENERAL
 
    Pryon  is  a   leading  supplier   of  capnography   products  for   medical
instrumentation  manufacturers.  Pryon  designs, manufactures  and  markets both
mainstream and  sidestream  sensors  and instrumentation  to  monitor  end-tidal
carbon dioxide ("CO(2)") levels present in the respired breath of critically ill
and  other  patients. This  CO(2) data,  coupled with  other clinical  signs and
information,  provides  clinicians  with  a  noninvasive  means  to  assess  the
patient's  ventilation, perfusion and circulatory status. In addition, Pryon has
expanded its mission in the medical market to provide complete airway monitoring
systems, using its strong market presence in CO(2) monitoring as leverage.
 
    Pryon's  base  technology  consists  primarily  of  small  sensing   devices
utilizing  infrared spectroscopy to measure clinical  levels of CO(2). Used with
Pryon's electronic control hardware and software, these sensors monitor CO(2) on
a  continuous  breath-to-breath  basis.  Pryon's  CO(2)  sensors  have  clinical
advantages  including  their small  size, light  weight  and no  requirement for
routine user calibration. These  attributes have allowed  Pryon to sell  sensors
and  electronic subsystems to  a number of OEM  manufacturers of various patient
monitoring systems. These companies,  in turn, package  the Pryon technology  in
their  own multi-parameter  monitoring instruments. Pryon  also manufactures for
Nellcor Puritan  Bennett  a  complete standalone  instrument  that  incorporates
Nellcor Puritan Bennett's oximetry and Pryon's CO(2) capability.
 
    In  1994, Pryon began manufacturing the  SC-300 CO(2) Monitor, a stand alone
instrument that  incorporates both  mainstream and  sidestream CO(2)  monitoring
modalities. Pryon has established a worldwide distribution network of anesthesia
and  respiratory care  dealers to  market the  product under  the Pryon  name. A
follow-up product, the SC-210 CO(2) Monitor, was introduced in August 1995. This
device utilizes the SC-300 platform and provides sidestream monitoring only  and
is  thus a more  cost effective alternative for  those customers requiring CO(2)
monitoring for non-intubated patients only.
 
    Pryon was  incorporated  in  April 1988  under  the  laws of  the  state  of
Wisconsin.
 
INDUSTRY
 
    The  health care industry  in general is  governed by increasingly stringent
government regulations both in the United States and internationally. The United
States Food and Drug Administration ("FDA") is the primary agency in the  United
States  providing regulatory oversight of the health care industry. The trend in
recent  years  has   been  toward  increased   regulation  and  enforcement   of
requirements  applicable to  companies operating  within this  environment. This
trend  has  caused  companies  to   experience  longer  approval  cycles,   more
uncertainty,   greater  risk  and  higher  expenses.  Currently,  there  are  no
indications that this trend will not continue in the short or long-term,  either
in the United States or internationally.
 
                                       49
<PAGE>
    In addition, the health care industry in the United States is experiencing a
period  of  extensive  change.  Managed  care  and  other  health  care provider
organizations have  increased  significantly in  terms  of both  the  number  of
individuals  receiving  medical  benefits  under  such  arrangements  and  their
influence over  the practices  and  pricing involving  the purchase  of  medical
devices.  Health care reform ideas, cost  containment initiatives and changes in
laws and regulations have been and will  continue to be proposed by the  current
administration   and  various   other  federal,   state  and   local  government
representatives.  Market   driven  reforms   are  resulting   in   industry-wide
consolidation  of the companies providing equipment and other products to large,
national buyer groups providing health care services.
 
    Medical  device  manufacturers  are  characterized  by  rapid  technological
changes  and  increased competition.  There  are many  companies  that currently
offer, or are in the process of developing, products that compete with  products
offered  by the major OEM  customers of Pryon. This  competition could result in
new technologies  or  products that  are  more effective  than  those  currently
produced  by  Pryon's  OEM  customers. Competition  in  the  captive measurement
capnography segment of  the medical device  market has decreased  over the  past
five years as many companies have abandoned their own technology in favor of OEM
providers.  Pryon believes it is currently the only company with both sidestream
and mainstream  capnography  technology. Generally,  mainstream  capnography  is
available  from  Pryon, Novametrix  and Andros.  Hewlett Packard  has mainstream
technology but is not making it  available to others. Sidestream capnography  is
available  from  Pryon and  Spegas  Industries, with  a  few companies  having a
sidestream device for use in their own products.
 
PRODUCTS
 
    Pryon manufactures solutions for CO(2) monitoring applications that  include
mainstream  and sidestream  CO(2) sensors for  OEM applications  and stand alone
monitors for both OEM and direct distribution channels. Pryon also  manufactures
a  line  of consumable  products that  are  used in  conjunction with  its CO(2)
sensors.
 
    CO(2) SENSORS.  Pryon offers a sidestream CO(2) sensor and related  hardware
and software on an OEM basis for use with non-intubated patients in applications
such  as post-ventilator  patient assessment,  conscious sedation,  acute asthma
assessment in the emergency room, assessment of patient conditions on BiPAP  and
other  applications. This sensor  has been manufactured by  Pryon since 1989. In
1991, Pryon  began producing  its  mainstream CO(2)  sensors  on an  OEM  basis.
Mainstream technology is used in hospital venues for intubated patients.
 
    STAND  ALONE CO(2)  MONITORS.   In addition to  the SC-300  and SC-210 CO(2)
monitors it manufactures and markets directly through its worldwide  distributor
network,  Pryon designed and is manufacturing a complete stand alone instrument,
the N-6000  UltraCap, for  Nellcor Puritan  Bennett. This  product  incorporates
Nellcor  Puritan  Bennett's  oximetry and  Pryon's  mainstream  CO(2) monitoring
capability.
 
    CONSUMABLE PRODUCTS.  With almost  every CO(2) system Pryon produces,  there
is  a need for a  continuing stream of consumable products  over the life of the
product. In mainstream monitoring there are  airway adapters, in both adult  and
neonatal  embodiments, that must be used with each sensor. These airway adapters
are predominantly single-patient  use. Sidestream systems  require a  disposable
water trap.
 
STRATEGY
 
    Pryon's  strategy  has been  and  will continue  to  be the  development and
support of current and new OEM customers and opportunities. Pryon's  continually
expanding OEM customer base and strong instrument and sensor sales from existing
OEM  customers has  contributed to  its 70%  compounded growth  rate in revenues
since 1991. In  addition, establishing  a dedicated, well  trained direct  sales
force  increases the revenue opportunity available  to Pryon with respect to its
direct stand alone instruments and consumable products over that of its  current
independent distributor network.
 
                                       50
<PAGE>
    The  capnography market is expected to grow  at a rate above the growth rate
in the medical  device industry  as a  whole. Several  regulatory, economic  and
demographic  trends are contributing to this growth. The respiratory market as a
whole, which  includes  capnography, is  expanding  with the  aging  population,
improving  technologies  and the  shift in  the location  of treatment  from the
hospital to lower cost  venues such as sub-acute  facilities and the home.  Over
the  past  several  years,  a number  of  recommendations  and  requirements for
capnography usage have been  initiated that will result  in positive effects  on
the  demand for capnography products in the hospital markets. These include: (i)
the incorporation  by  the  American Society  of  Anesthesiologists  ("ASA")  of
capnography  as a standard of  care in operating rooms;  (ii) an addition to the
ASA GUIDELINES  FOR SEDATION  AND ANALGESIA  BY NON-ANESTHESIOLOGISTS  asserting
that  when  ventilation  cannot be  directly  observed capnography  is  a useful
adjunct, and  that  oximetry is  not  a substitute  for  monitoring  ventilatory
function;  (iii) the urging by the  American College of Emergency Physicians for
the use of capnography in the emergency room; and (iv) the recommendation by the
U.S. Society of Critical Care Medicine for capnography in the ICU. Expansion  of
the  capnography market into non-hospital care areas such as outpatient surgery,
pre-hospital EMS and  home care will  be driven by  the trend towards  providing
patient  care in lower  cost venues, and  the need for  verifying intubation and
assessing the likely outcome  of cardiopulmonary resuscitation. Pryon  currently
has and is developing additional products to address these growth opportunities.
In  addition, it will continue to develop training and clinical support programs
to further  the acceptance  and  utilization of  capnography  as a  standard  of
patient care.
 
    Pryon  believes its  CO(2) technology  has a  number of  clinical advantages
including its small size, light  weight, no requirement for routine  calibration
and a high degree of immunity to patient contaminants.
 
CUSTOMER SUPPORT AND SERVICE
 
    In  addition to offering  quality products and  technology to its customers,
Pryon believes  that  providing  technical support  and  clinical  education  is
fundamental to achieving success in the market. Towards that end, Pryon supplies
complete  engineering, manufacturing  and quality  assurance support  to its OEM
customers and provides custom  adaptations of its  technology, if necessary,  to
meet  customer requirements.  Further, Pryon  prepares and  produces an clinical
education program  and provides  product and  clinical training  on a  worldwide
basis to both its OEM customers and distributors of its direct products.
 
MARKETING AND CUSTOMERS
 
    Since  shipping its first  products in 1989,  Pryon's marketing strategy has
focused heavily  on  establishing  and developing  OEM  customer  relationships.
Pryon's  OEM customers include leading U.S. and international patient monitoring
systems manufacturers,  including  Nellcor Puritan  Bennett,  Protocol  Systems,
SpaceLabs  Medical, Marquette  Electronics, Medical  Data Electronics, PaceTech,
Hellige GmbH,  Nihon  Kohden,  NEC,  Schiller AG.,  G.  Stemple  GmbH,  Digicare
Biomedical  Technology, Anamed,  Bese and  BASCO CS  Ltd. During  1995 and 1996,
Pryon has added additional new OEM customers. During 1995, Pryon entered into  a
new 7 year capnography supply agreement with one of its current customers. Since
the  typical  time  period from  signing  of  an OEM  agreement  to  shipment of
production volume is 12 to  18 months, which includes  the time required by  the
customer for development and incorporation of the Pryon technology into the host
system  and obtainment  of the required  governmental approvals,  Pryon does not
anticipate any substantial revenue from these new customers until 1997.
 
    Pryon began its direct distribution  effort in 1994 and  by the end of  1995
had  direct product distribution domestically  and internationally in most major
markets. Pryon  utilizes  independent  respiratory care  and  medical  equipment
dealers  throughout  the U.S.  and internationally.  A few  selected territories
within the  U.S. are  covered  with independent  manufacturers  representatives.
Pryon has three individuals dedicated to managing its domestic and international
distribution efforts.
 
                                       51
<PAGE>
MANUFACTURING
 
    Pryon  manufactures and assembles its products  at its facility in Menomonee
Falls, Wisconsin, and currently employs a total of 61 persons in  manufacturing,
including four manufacturing engineers.
 
    Over  the past three years, Pryon has  made capital and other investments to
enhance its manufacturing  process and  systems to improve  product quality  and
reliability.  Investments  included production  specific systems,  personnel and
capital equipment, including  computerized in-process  test stations,  automatic
computerized  calibration, specialized test fixtures  and an airway adapter test
system. In  addition,  Pryon made  a  significant investment  in  personnel  and
systems  in the  areas of  quality, regulatory  and documentation  control. As a
result of these efforts,  Pryon received ISO9001  and EN46001 certifications  in
November  1995. Pryon's most recent FDA inspection concluded in January 1995. No
Form 483 was issued.
 
RESEARCH AND DEVELOPMENT
 
    Pryon invests heavily in  research and development  to enhance and  leverage
its  core technology and  to continually develop  new products and technologies.
Pryon employs 19 people in its  engineering and research and development  groups
with  the majority of  the personnel in  these areas having  been with Pryon for
over four years.
 
FACILITIES
 
    Pryon's   administrative,   manufacturing,    engineering,   research    and
development,  and marketing and sales facilities are located in Menomonee Falls,
Wisconsin, and consist of approximately 26,000  square feet under a lease  which
expires  on June 30, 1997.  Pryon moved to this  facility in January 1991. Pryon
believes that its existing facilities are  adequate to meet its requirements  at
least through 1997.
 
EMPLOYEES
 
    Pryon  currently has  106 employees,  including 61  in manufacturing,  19 in
engineering and research  and development,  nine in quality  assurance, nine  in
marketing  and  sales,  seven in  administration,  finance  and MIS  and  one in
regulatory affairs. None of  Pryon's employees are  represented by a  collective
bargaining  agreement. Pryon  believes its employee  relations are  good and has
never experienced a work stoppage.  Pryon occasionally uses temporary  employees
to meet fluctuating demand in manufacturing.
 
                                       52
<PAGE>
                         SELECTED PRYON FINANCIAL DATA
 
    The  following selected historical financial data of Pryon have been derived
from Pryon's historical financial statements. Pryon's audited Balance Sheets  as
of  December 31,  1995 and  1994, its audited  Statements of  Operations for the
years 1995, 1994 and 1993, its unaudited Balance Sheet as of March 31, 1996  and
its  unaudited Statements of Operations for  the three-month periods ended March
31,   1996   and   1995   are   included   elsewhere   in   this   Joint   Proxy
Statement/Prospectus  and  should be  read  in conjunction  with  such financial
statements and the  notes thereto.  Pryon's other  audited historical  financial
statements for 1993, 1992 and 1991 are not included herein.
 
<TABLE>
<CAPTION>
                                                                                                                AT OR FOR THREE
                                                                                                               MONTHS ENDED MARCH
                                                                 AT OR FOR YEAR ENDED DECEMBER 31,                    31,
                                                       -----------------------------------------------------  --------------------
                                                         1995       1994       1993       1992       1991       1996       1995
                                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                                                                                  (UNAUDITED)
<S>                                                    <C>        <C>        <C>        <C>        <C>        <C>        <C>
Consolidated Statement of Operations Data
  Sales..............................................  $  12,276  $   8,001  $   7,240  $   3,066  $   1,460  $   3,135  $   3,059
  Cost of sales......................................      7,242      5,435      5,213      2,132        632      1,755      1,791
                                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Gross profit.......................................      5,034      2,566      2,027        934        828      1,380      1,268
  Operating expenses:
    Research and development.........................      1,529      1,353      1,140        924        674        459        369
    Selling, general and administrative..............      2,492      1,856      1,116        839        791        666        528
                                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Total operating expenses...........................      4,021      3,209      2,256      1,763      1,465      1,125        897
                                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Income (loss) from operations......................      1,013       (643)      (229)      (829)      (637)       255        371
  Other income (expense):
    Interest expense.................................       (186)      (146)       (51)       (46)       (39)       (50)       (43)
    Other............................................         (9)        (5)        16         20         55         (3)        10
                                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Income (loss) before income taxes..................        818       (794)      (264)      (855)      (621)       202        338
  Provision for income taxes.........................          0          0          0          0          0          0          0
                                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Net income (loss)..................................  $     818  $    (794) $    (264) $    (855) $    (621) $     202  $     338
                                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Net income (loss) per common and common equivalent
   share.............................................  $    3.65  $  (10.55) $   (3.51) $  (11.20) $   (7.85) $    0.89  $    1.49
                                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                       ---------  ---------  ---------  ---------  ---------  ---------  ---------
Consolidated Balance Sheet Data
  Cash and investments...............................  $      45  $     167  $     143  $   1,674  $     665  $      10  $     101
  Working capital....................................      4,176      2,022      2,374      3,205        993      4,626      2,361
  Total assets.......................................      7,710      6,612      5,221      5,687      2,330      7,867      6,922
  Long-term debt excluding current maturities........      1,795        156        387        319        362      1,972        132
  Redeemable preferred stock.........................      6,737      6,737      5,741      5,731      1,783      6,737      6,737
  Shareholders' (deficit) equity.....................     (2,271)    (3,089)    (2,295)    (2,032)    (1,171)    (2,069)    (2,751)
  Book value per common and common
   equivalent share..................................     (30.11)    (40.98)    (30.53)    (27.10)    (15.05)    (27.44)    (36.50)
</TABLE>
 
                                       53
<PAGE>
                   PRYON MANAGEMENT'S DISCUSSION AND ANALYSIS
 
RESULTS OF OPERATIONS
FIRST QUARTER 1996 COMPARED TO FIRST QUARTER 1995
 
    SALES.   Sales for the first quarter  of 1996 increased 2.5% to $3.1 million
from $3.0 million in the first quarter of 1995. Original Equipment  Manufacturer
(OEM) sales for the first quarter of 1996 totaled $2.7 million or 84.9% of sales
as  compared to  $2.8 million  or 90.8%  of first  quarter 1995  sales. Sales of
Pryon's directly  marketed products  increased 75.1%  to $371,000  in the  first
quarter  of 1996 from $212,000  in the first quarter  of 1995. Service and other
revenues totaled $103,000 and  $70,000 for the first  quarter of 1996 and  1995,
respectively.
 
    Sales to three significant OEM customers, Nellcor Puritan Bennett, SpaceLabs
Medical  and Protocol  Systems, accounted for  48.5% and 63.5%  of first quarter
sales of Pryon in 1996  and 1995, respectively. First  quarter of 1996 sales  to
these  customers  decreased $421,000  from the  prior  year as  a result  of the
inability of one of these customers to supply Pryon with the materials necessary
to complete the manufacturing of its  product by Pryon. This supply problem  was
corrected at the end of March 1996. Sales to other current and new OEM customers
in the first quarter of 1996 increased $305,000 from the prior year.
 
    In  August 1994,  Pryon introduced  its first  direct product  -- the SC-300
CO(2) Monitor. Sales of this product were  modest in the first quarter of  1995.
Pryon  believes its dealer  network initially had  some difficulty marketing the
product but Pryon continued efforts in market development and providing  dealers
with  assistance in identifying  and closing sales  opportunities. These efforts
resulted in increased sales of the SC-300  during the first quarter of 1996  and
Pryon's  second direct product -- the SC-210 CO(2) Monitor, which was introduced
in September 1995.
 
    An important component of Pryon's sales is its line of consumable  products.
With  almost every CO(2) system Pryon produces, there is a need for a continuing
stream of consumable  products over the  life of  the system. Sales  of OEM  and
direct  consumable products increased 14.8% to  $498,000 in the first quarter of
1996 from $434,000  in the prior  year. Pryon  produced 15.9% and  14.2% of  its
total  sales in the first  quarter of 1996 and  1995, respectively from sales of
its consumable  products.  As the  total  installed population  of  Pryon  CO(2)
systems grows, the consumable products' contribution is expected to increase.
 
    GROSS PROFIT.  Gross profit as a percentage of sales increased from 41.5% in
the  first quarter of 1995 to  44.0% in 1996. The increase  in gross profit as a
percentage of sales  was attributable in  large part to  the increase in  direct
sales  as a percentage  of total sales and  to the reduction in  sales to one of
Pryon's OEM customers which currently has a lower margin than other products. In
addition, Pryon  experienced continued  improvements in  manufacturing  overhead
expense absorption and direct labor efficiencies in the first quarter of 1996.
 
    RESEARCH AND DEVELOPMENT.  Research and development expenses increased 24.4%
to  $459,000  in the  first quarter  of 1996  from $369,000  in the  prior year.
One-time expenses were incurred during the first quarter of 1996 relating to new
product development effort including its  DuET CO(2) System, which will  provide
OEM  customers with  both mainstream  and sidestream  capabilities in  a single,
small configuration. As a percentage of sales, research and development expenses
increased to 14.7% in the first quarter of 1996 from 12.1% in 1995.
 
    SELLING, GENERAL AND  ADMINISTRATIVE.  Selling,  general and  administrative
expenses  increased 26.1% to $666,000 in the first quarter of 1996 from $528,000
in 1995. A significant increase in payroll  and related costs as well as  travel
expenses were incurred during the first quarter of 1996 over 1995 as a result of
Pryon adding three employees to manage its domestic and international network of
dealers   established  to  market  the  Company's  direct  products.  Additional
increases were the result of costs
 
                                       54
<PAGE>
associated with  expanding  Pryon's management  information  systems,  continued
development   of  training  materials  and  other  employee  related  costs.  As
percentage of sales, selling, general  and administrative expenses increased  to
21.2% in the first quarter of 1996 from 17.3% in 1995.
 
    OTHER  EXPENSES.   Other  expense (net)  increased to  $53,000 in  the first
quarter of 1996 from $33,000 in 1995  as a result of increased interest  expense
on  borrowings required to fund the  Company's working capital needs and $15,000
in non-recurring engineering charges received during the first quarter of 1995.
 
    PROVISION FOR INCOME TAXES.  The Company did not provide for income taxes in
the first quarter of 1996 and 1995 as its net operating loss carryforwards  were
sufficient  to cover all reported income for  each period. As of March 31, 1996,
the Company had approximately $1.1  million in net operating loss  carryforwards
to offset future taxable income.
 
1995 COMPARED TO 1994
 
    SALES.   Sales increased 53.4% to $12.3 million in 1995 from $8.0 million in
1994. Original Equipment Manufacturer (OEM) sales for 1995 totaled $11.1 million
or 90.1% of sales as compared to $7.1  million or 88.5% of 1994 sales. Sales  of
Pryon's  directly marketed products increased 39.0% to $852,000 from $613,000 in
1994. Service  and  other  revenues  during 1995  and  1994  were  $361,000  and
$307,000, respectively.
 
    Sales to three significant OEM customers, Nellcor Puritan Bennett, SpaceLabs
Medical  and Protocol Systems, accounted  for 67.6% and 64.8%  of total sales of
Pryon in 1995 and 1994, respectively. These customers accounted for $3.2 million
of the $4.0  million increase in  OEM sales in  1995 over 1994,  with the  noted
increase  the result of one  of the OEM customers  receiving products for a full
year in 1995 and a general increase  in market demand for CO(2) monitoring.  The
1995 increase was also attributed to increases in sales to other current and new
OEM customers.
 
    In  August 1994,  Pryon introduced  its first  direct product  -- the SC-300
CO(2) Monitor. The majority  of direct sales for  1994 were demonstration  units
purchased  by  Pryon's network  of independent  anesthesia and  respiratory care
dealers which was established during the year. Sales of this product were modest
through the first half of 1995. Pryon believes its dealer network initially  had
some  difficulty marketing  the product  but Pryon  continued efforts  in market
development and providing  dealers with  assistance in  identifying and  closing
sales  opportunities. In the last four  months of 1995, SC-300 sales accelerated
and Pryon introduced its second direct product -- the SC-210 CO(2) Monitor.
 
    An important component  of Pryon's  sales is  its broad  line of  consumable
products.  With almost every CO(2) system Pryon  produces, there is a need for a
continuing stream of consumable products over  the life of the system. Sales  of
OEM and direct consumable products increased 111.9% to $1.5 million in 1995 from
$720,000  in 1994. Sales of  its consumable products produced  12.4% and 9.0% of
its total  sales  in  1995  and  1994,  respectively.  As  the  total  installed
population of Pryon CO(2) systems grows, the consumable products contribution to
total sales is expected to increase.
 
    GROSS PROFIT.  Gross profit as a percentage of sales increased from 32.1% in
1994  to 41.0%  in 1995. The  $4.3 million increase  in sales in  1995 over 1994
allowed  for  significant   improvements  in   manufacturing  overhead   expense
absorption.  The significant investment  in equipment and  personnel made during
1993 and 1994  produced substantial  direct labor efficiencies  during 1995.  In
addition, the average selling price of Pryon's direct instruments increased 8.2%
from 1994 to 1995.
 
    RESEARCH AND DEVELOPMENT.  Research and development expenses increased 13.0%
to  $1.5  million in  1995 from  $1.4  million in  1994. One-time  expenses were
incurred in completing the  development of the SC-210,  which was introduced  in
1995.   Pryon  also  incurred  significant   expenses  related  to  new  product
development efforts, including Pryon's  family of hand-held monitoring  devices,
which  will incorporate  sidestream CO(2),  oximetry and  pulmonary mechanics in
various single and multiple parameter configurations, and its DuET CO(2) System,
which will provide OEM customers with both
 
                                       55
<PAGE>
mainstream and sidestream capabilities in a single, small configuration. Further
increases in research and development costs were incurred in the development  of
a  new infrared  source to be  used in  most of Pryon's  CO(2) systems. Expenses
incurred during 1994 included  significant costs related  to the development  of
the  SC-300.  As  a  percentage  of  sales,  research  and  development expenses
decreased to 12.5% in 1995 from 16.9% in 1994.
 
    SELLING, GENERAL AND  ADMINISTRATIVE.  Selling,  general and  administrative
expenses  increased 34.3% to $2.5  million in 1995 from  $1.9 million in 1994. A
significant increase in payroll and related costs as well as travel expenses was
incurred during 1995 as a  result of the addition  of three employees to  manage
Pryon's  network  of domestic  and international  dealers established  to market
Pryon's direct  products.  Additional increases  were  the result  of  continued
development  of  product  literature  and  training  materials,  one-time  costs
associated with Pryon's ISO-9000 certification and other employee-related costs.
As a percentage of sales, selling, general and administrative expenses decreased
to 20.3% in 1995 from 23.2% in 1994.
 
    OTHER EXPENSE.   Other  expense (net)  increased to  $195,000 in  1995  from
$151,000  in  1994  as a  result  of  increased interest  expense  on borrowings
required to fund the Company's growth in working capital needs due to the  53.4%
increase in sales realized during 1995.
 
    PROVISION  FOR INCOME  TAXES.  Pryon's  1995 provision for  income taxes was
offset by utilization of  net operating loss carryforwards.  As of December  31,
1995, the Company had $1.3 million in net operating loss carryforwards to offset
future  taxable income. A valuation reserve has been recorded against the entire
deferred tax asset  at December  31, 1995,  as a  result of  Pryon's history  of
operating losses and the uncertainty associated with distribution and acceptance
of its direct products.
 
1994 COMPARED TO 1993
 
    SALES.   Sales increased 10.5% to $8.0  million in 1994 from $7.2 million in
1993. Original Equipment Manufacturer (OEM) sales for 1994 totaled $7.1  million
or  88.5% of sales as compared to $7.0  million or 96.4% of 1994 sales. Sales of
Pryon's direct products  which began in  August 1994 totaled  $613,000 in  1994.
Service  and  other revenues  in 1994  and 1993  totaled $307,000  and $259,000,
respectively.
 
    Sales to three significant OEM customers, Nellcor Puritan Bennett, SpaceLabs
Medical and Protocol  Systems, accounted for  64.8% of total  sales of Pryon  in
1994.  Sales to  two of  these customers,  Nellcor Puritan  Bennett and Protocol
Systems accounted for 71.9% of total sales in 1993.
 
    In August 1994, Pryon introduced its first direct product, the SC-300  CO(2)
Monitor.  The  majority  of  direct  sales  for  1994  were  demonstration units
purchased by  Pryon's network  of independent  anesthesia and  respiratory  care
dealers  which was  established during  the year.  Sales by  dealers to  end use
customers were modest. Direct sales of instruments and consumables accounted for
$613,000 or 7.7% of Pryon's total sales for 1994.
 
    Sales of OEM and direct consumable  products increased 18.8% to $720,000  in
1994  from $606,000 in 1993. The increase is attributed to the growing installed
base of CO(2) systems.
 
    GROSS PROFIT.  Gross profit as a  percentage of sales increased to 32.1%  in
1994  from  28.0% in  1993.  During 1994  and  1993, Pryon  invested significant
resources in capital  and personnel  in the  manufacturing area  to develop  the
infrastructure   necessary  to  support  its   growing  customer  demand,  which
substantially depressed margins  in each  year. The increase  was primarily  the
result  of changes in product  mix with an additional  $1.5 million of 1994 over
1993 sales coming  from higher  margin OEM  sensor products  and direct  product
sales.
 
    RESEARCH AND DEVELOPMENT.  Research and development expenses increased 18.7%
to  $1.4 million in 1994  from $1.1 million in  1993. Pryon invested substantial
one-time resources in  the development  and introduction of  its initial  direct
product offering, the SC-300. In addition, substantial
 
                                       56
<PAGE>
research  and development  expenses were incurred  related to  other new product
development efforts  and OEM  customer  technical support.  As a  percentage  of
sales,  research and development expenses increased  to 16.9% in 1994 from 15.7%
in 1993.
 
    SELLING, GENERAL AND  ADMINISTRATIVE.  Selling,  general and  administrative
expenses  increased 66.2%  to $1.9  million in 1994  from $1.1  million in 1993.
Marketing and sales  expenses increased  significantly as the  development of  a
worldwide  dealer distribution  network was initiated.  Personnel related costs,
travel expenses and  the costs associated  with product literature,  advertising
and  training  materials  for  the  new product  were  significant  in  1994. In
addition, costs  relating  to implementation  of  a new  management  information
system  further contributed to the increase in expenses in 1994. As a percentage
of sales, selling,  general and  administrative expenses increased  to 23.2%  in
1994 from 15.4% in 1993.
 
    OTHER  EXPENSE.   Other  expense (net)  increased to  $151,000 in  1994 from
$34,000 in 1993 as a result of increased interest expense on borrowings required
to fund the Company's growth in working capital needs and significant investment
in development of a worldwide dealer distribution network.
 
    PROVISION FOR INCOME TAXES.  The Company did not provide for income taxes in
1994 as it reported a  loss for the year. As  of December 31, 1994, the  Company
had  $2.1 million in  net operating loss carryforwards  to offset future taxable
income. Pryon adopted Statement of Financial Accounting Standards No. 109  ("FAS
109"),  Accounting for Income Taxes on a prospective basis, effective January 1,
1993. The adoption of FAS 109 had no cumulative effect on the financial position
of Pryon.
 
LIQUIDITY AND CAPITAL RESOURCES
 
    During 1995, Pryon secured a new bank facility totaling $2.8 million to fund
its growth  requirements  in  working  capital  and  capital  acquisitions.  The
facility consists of three components; a $2.3 million line of credit, a $250,000
term  note which  was used  to retire  previously outstanding  term debt  and an
additional $250,000 term note to fund future capital acquisitions. At March  31,
1996,  borrowings of $1.7 million on the line of credit and $225,000 on the term
note were outstanding. Available borrowings  under the line of credit  agreement
are limited by certain calculations based upon accounts receivable and inventory
balances  of  Pryon. As  of March  31,  1996, Pryon  had $377,000  of additional
available borrowings under its line of credit and $250,000 available under  term
note agreements. Pryon also has $226,000 of notes payable outstanding to certain
of   its  officers  and  shareholders.  Pryon  is  required  to  make  quarterly
prepayments of principal on these notes based upon a formula which is  dependent
upon  its  reported  quarterly  earnings,  subject  to  the  debt  subordination
agreement with its bank.
 
    Working capital  increased to  $4.8  million at  March  31, 1996  from  $4.2
million  at December  31, 1995  and $2.4  million at  March 31,  1995. Operating
activities generated a net cash use of $182,000 in the first quarter of 1996  as
compared  to  $48,000 in  the  first quarter  of  1995. Accounts  receivable and
inventories increased  $165,000  and  $75,000, respectively,  during  the  first
quarter  of 1996 as collections from and  sales of direct products to US dealers
slowed following the announcement of Protocol's acquisition of Pryon. Pryon does
not anticipate  any  material  issue  with respect  to  collection  of  accounts
receivable  from terminated dealers. Accounts payable and other accrued expenses
were reduced by $359,000 during the first quarter of 1996. Capital  expenditures
during  the  first  quarter of  1996  and  1995 totaled  $126,000  and $186,000,
respectively. Pryon does  not anticipate future  capital expenditures to  exceed
historical  levels and believes its current  financial position is sufficient to
fund these acquisitions.
 
                                       57
<PAGE>
                              PROTOCOL MANAGEMENT
 
EXECUTIVE OFFICERS
 
    The following  table sets  forth  certain information  with respect  to  the
executive officers of Protocol.
 
<TABLE>
<CAPTION>
          NAME                AGE                                 POSITION
- ------------------------      ---      ---------------------------------------------------------------
<S>                       <C>          <C>
James B. Moon                     50   President, Chief Executive Officer and Chairman of the Board of
                                        Directors
Craig M. Swanson                  53   Vice President, Finance, Chief Financial Officer and Secretary
James P. Fee, Jr.                 50   Vice President, Marketing and Sales
Lawrence C. Gray                  48   Vice President, Engineering
Carl P. Hollstein, Jr.            56   Vice President, Manufacturing
Allen L. Oyler                    50   Vice President, Human Resources and Administration
James P. Welch                    44   Vice President, Quality Systems
</TABLE>
 
    Information  concerning the  principal occupation of  Mr. Moon  is set forth
under "Election of Directors."  Information concerning the principal  occupation
during  at least the last  five years of the  executive officers of Protocol who
are not also directors of Protocol is set forth below.
 
    CRAIG M. SWANSON.   Mr. Swanson joined Protocol  in 1988 as Vice  President,
Finance,  and Chief Financial Officer. He  was elected Secretary in 1990. Before
joining Protocol,  Mr. Swanson  was  President and  Chief Operating  Officer  of
Receptor  Corporation, a  biotechnology company,  from 1987  to 1988,  and Chief
Financial Officer of Scientific Computer Systems Corporation from 1984 to  1987.
Mr.  Swanson has more than  10 years of public  accounting experience with Price
Waterhouse and Arthur Young & Company.
 
    JAMES P.  FEE, JR.   Mr.  Fee joined  Protocol in  1988 as  Vice  President,
Marketing  and Sales. Mr.  Fee spent the  previous 14 years  with Physio Control
Corporation, a  manufacturer of  cardiac defibrillators  and subsidiary  of  Eli
Lilly  and Company. From  1987 to November  1988, Mr. Fee  was Vice President of
Marketing and from 1982 to  1987 Vice President of  Sales and Service of  Physio
Control Corporation.
 
    LAWRENCE  C. GRAY.   Mr. Gray joined  Protocol in 1991  as Director, Systems
Engineering, and became Vice President,  Engineering in February 1995. Prior  to
joining   Protocol,  Mr.  Gray  was  Director  of  Engineering  for  Racal-Milgo
Information Systems.
 
    CARL P.  HOLLSTEIN, JR.   Mr.  Hollstein  joined Protocol  in 1993  as  Vice
President,   Manufacturing.  Before  joining  Protocol,   Mr.  Hollstein  was  a
self-employed management consultant from  1991 to 1993. From  1978 to 1991,  Mr.
Hollstein  worked  for  Intel  Corporation,  holding  a  variety  of  positions,
including Engineering Manager; General  Manager, Development Systems  Operation;
and Director of Quality Systems Group.
 
    ALLEN  L.  OYLER.   Mr. Oyler  joined  Protocol in  1993 as  Director, Human
Resources and was  elected Vice  President, Human  Resources and  Administration
effective  January 1, 1994.  Prior to joining Protocol,  Mr. Oyler was Director,
Human Resources at SpaceLabs, Inc. from 1984 to 1993.
 
    JAMES P.  WELCH.   Mr. Welch  joined  Protocol in  1991 as  Vice  President,
Engineering,  and became Vice President, Quality  Systems in July 1994. Prior to
joining Protocol,  Mr.  Welch served  for  ten  years as  director  of  hospital
clinical  engineering, special assistant to the Office of Technology Affairs and
associate director  of  the  anaesthesia bioengineering  unit  at  Massachusetts
General Hospital, in Boston, Massachusetts.
 
                                       58
<PAGE>
                        PROTOCOL EXECUTIVE COMPENSATION
 
SUMMARY OF CASH AND CERTAIN OTHER COMPENSATION
 
    The   following  table  provides   certain  summary  information  concerning
compensation of Protocol's Chief  Executive Officer and each  of the five  other
most  highly compensated  executive officers  of Protocol  (the "named executive
officers") for the fiscal years ending December 31, 1993, 1994 and 1995 or  such
period  as the  named executive  officer has served  as an  executive officer of
Protocol.
 
<TABLE>
<CAPTION>
                                                                                            LONG-TERM COMPENSATION
                                                                ANNUAL COMPENSATION         -----------------------
                                                         ---------------------------------   SECURITIES UNDERLYING
NAME AND PRINCIPAL POSITION                                YEAR       SALARY       BONUS     STOCK OPTIONS GRANTED
- -------------------------------------------------------  ---------  -----------  ---------  -----------------------
<S>                                                      <C>        <C>          <C>        <C>
James B. Moon .........................................       1995  $   158,351  $  40,500                --
  President, Chief Executive Officer and Chairman of          1994      149,226     35,299            40,000
  the Board of Directors                                      1993      140,229     33,694            25,000
Craig M. Swanson ......................................       1995      125,651     32,284                --
  Vice President, Finance, Chief Financial Officer and        1994      119,438     21,190            24,000
  Secretary                                                   1993      115,189     18,762            12,000
James P. Fee, Jr. .....................................       1995      115,598     74,818                --
  Vice President, Marketing and Sales                         1994      109,381     51,439            24,000
                                                              1993      100,145     39,149            10,000
Lawrence C. Gray ......................................       1995      115,309     25,485            10,000
  Vice President, Engineering
Carl P. Hollstein, Jr. ................................       1995      107,794     24,107                --
  Vice President, Manufacturing                               1994       99,516     17,655                --
                                                              1993       59,863      9,538            30,000
James P. Welch ........................................       1995      107,794     24,107                --
  Vice President, Quality Systems                             1994      100,000     17,673                --
                                                              1993      100,112     16,315             6,000
</TABLE>
 
STOCK OPTIONS
 
    The following table sets forth information concerning options granted to the
named executives during the year ended  December 31, 1995 under Protocol's  1992
Stock Incentive Plan.
 
                       OPTION GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                                                                         POTENTIAL REALIZABLE
                                                                                                           VALUE AT ASSUMED
                                                                                                        ANNUAL RATES OF STOCK
                                    NUMBER OF                                                           PRICE APPRECIATION FOR
                                    SECURITIES        PERCENT OF TOTAL                                     OPTION TERM (2)
                                UNDERLYING OPTIONS   OPTIONS GRANTED TO    EXERCISE PRICE   EXPIRATION  ----------------------
NAME                               GRANTED (1)        EMPLOYEES IN 1995       PER SHARE        DATE        5%          10%
- ------------------------------  ------------------  ---------------------  ---------------  ----------  ---------  -----------
<S>                             <C>                 <C>                    <C>              <C>         <C>        <C>
James B. Moon.................          --                   --                  --             --         --          --
Craig M. Swanson..............          --                   --                  --             --         --          --
James P. Fee, Jr..............          --                   --                  --             --         --          --
Lawrence C. Gray..............          10,000                  6.8           $    8.75      01/03/05   $  55,028  $   139,452
Carl P. Hollstein, Jr.........          --                   --                  --             --         --          --
James P. Welch................          --                   --                  --             --
</TABLE>
 
- ------------------------
(1)  Options granted  in 1995  become exercisable  starting 12  months after the
    grant date, with  one-quarter of  the options becoming  exercisable at  that
    time  and with an additional one-quarter of the options becoming exercisable
    on the  second, third  and fourth  anniversary dates  of the  option  grant,
    respectively.
 
(2)  The amounts  shown are  hypothetical gains  based on  the indicated assumed
    rates of appreciation of the Common Stock compounded annually for a ten-year
    period. Actual gains, if any, on stock
 
                                       59
<PAGE>
    option exercises are dependent on the future performance of the Common Stock
    and overall stock  market conditions.  There can  be no  assurance that  the
    Common  Stock will  appreciate at  any particular rate  or at  all in future
    years.
 
OPTION EXERCISES AND HOLDINGS
 
    The  following  table  provides  information,  with  respect  to  the  named
executive  officers, concerning the  exercise of options  during the last fiscal
year and unexercised options held as of December 31, 1995.
 
<TABLE>
<CAPTION>
                                                                         NUMBER OF SECURITIES        VALUE OF UNEXERCISED
                                                                        UNDERLYING UNEXERCISED           IN-THE-MONEY
                                              SHARES                      OPTIONS AT FY-END         OPTIONS AT FY-END (2)
                                           ACQUIRED ON      VALUE     --------------------------  --------------------------
NAME                                         EXERCISE    REALIZED (1) EXERCISABLE  UNEXERCISABLE  EXERCISABLE  UNEXERCISABLE
- -----------------------------------------  ------------  -----------  -----------  -------------  -----------  -------------
<S>                                        <C>           <C>          <C>          <C>            <C>          <C>
James B. Moon............................       --           --           29,250        36,250    $    93,063   $    55,938
Craig M. Swanson.........................       25,000    $ 234,500       76,167        24,000        518,529        78,000
James P. Fee, Jr.........................        4,000       36,720       87,334        23,000        629,867        76,250
Lawrence C. Gray.........................        3,000       21,975       17,500        11,500        137,462        24,438
Carl P. Hollstein, Jr....................       --           --           15,000        15,000         48,750        48,750
James P. Welch...........................       --           --           22,334         3,000        153,204         5,250
</TABLE>
 
- ------------------------
(1) The value realized is  based on the difference  between the market price  at
    the time of exercise of the options and the applicable exercise price.
 
(2) The  value of  unexercised in-the-money options  is based  on the difference
    between $10.50, which was the closing price of the Common Stock on  December
    29, 1995 and the applicable exercise price.
 
DIRECTOR COMPENSATION
 
    The  members  of Protocol's  Board of  Directors  are reimbursed  for actual
out-of-pocket and  travel  expenses incurred  in  attending Board  meetings.  In
addition,  nonemployee members of the Board of Directors receive a $5,000 annual
retainer, $1,000 for each Board meeting attended and $500 for each meeting of  a
committee  of the  Board attended. Under  Protocol's 1993 Stock  Option Plan for
Nonemployee Directors (the "1993 Plan"),  each person who becomes a  nonemployee
director  automatically receives an  initial option to  purchase 3,000 shares of
Protocol's Common Stock immediately following  the annual meeting at which  such
director  is first elected to the  Board of Directors. Each nonemployee director
automatically receives additional  annual grants  of options  to purchase  3,000
shares  after  each annual  meeting  of shareholders,  provided  the nonemployee
director continues to serve in that capacity. Each option expires ten years from
the date of its  grant. Outstanding options will  expire earlier if an  optionee
terminates  service  as a  director before  the end  of the  ten year  term. The
exercise price of options granted under the  1993 Plan may not be less than  the
fair market value of a share of Common Stock on the date of grant of the option.
Options  become fully vested and exercisable on  the date of grant. Dr. Newbower
is precluded  from  participating  in the  1993  Plan  by the  policies  of  his
employer,  Massachusetts General Hospital. Accordingly, Dr. Newbower receives an
additional $2,000 for  each Board meeting  attended in lieu  of receiving  stock
options  under the  1993 Plan. Subject  to shareholder approval  at the Protocol
Annual Meeting, the Board  of Directors has approved  certain amendments to  the
1993 Plan that would increase the size of the option grants under the 1993 Plan.
See  "APPROVAL OF AMENDMENTS TO PROTOCOL  1993 STOCK OPTION PLAN FOR NONEMPLOYEE
DIRECTORS."
 
COMPENSATION COMMITTEE REPORT
 
    Under rules established by the SEC, Protocol is required to provide  certain
data  and information  in regard  to the  compensation and  benefits provided to
Protocol's Chief Executive Officer  and the four  other most highly  compensated
executive  officers.  In  fulfillment  of  this  requirement,  the  Compensation
Committee has  prepared  the  following  report  for  inclusion  in  this  Proxy
Statement.
 
                                       60
<PAGE>
    COMPENSATION  PHILOSOPHY.    The  Compensation  Committee  of  the  Board of
Directors, which is responsible for reviewing and evaluating the compensation of
Protocol's executive officers, approves and recommends to the Board of Directors
compensation and award levels for executive officers of Protocol. With regard to
compensation actions affecting Mr. Moon, all  of the nonemployee members of  the
Board of Directors act as the approving body.
 
    The executive compensation program of Protocol has been designed to:
 
    - Support  a  pay  for performance  policy  that  is tied  to  corporate and
      individual performance;
 
    - Motivate executive officers to achieve strategic business initiatives  and
      reward them for their achievement;
 
    - Provide  compensation opportunities which are  comparable to those offered
      by similarly-sized medical and technology-based companies;
 
    - Align  the  interest  of  executives   with  the  long-term  interest   of
      shareholders  through award opportunities that  can result in ownership of
      Common Stock.
 
    Currently, the executive compensation program  is comprised of salary,  cash
bonus  opportunities and long-term incentive opportunities  in the form of stock
options, along  with  benefits offered  to  all  employees of  Protocol.  As  an
executive's  level of responsibility increases, a  greater portion of his or her
potential total compensation opportunity is based on performance incentives  and
less  on  salary  and  employee benefits,  causing  greater  variability  in the
individual's total compensation level from year-to-year.
 
    SALARIES.   The salaries  of  Protocol's executive  officers for  1995  were
established  effective June 25, 1995. In establishing the salaries of Protocol's
executive officers  the  Compensation  Committee  considered  information  about
salaries  paid by  companies of comparable  size in the  electronics and medical
electronics   industry,   individual   performance,   position,   and   internal
comparability considerations. The Compensation Committee did not assign specific
weights to any of these factors.
 
    BONUS  PLAN.  Bonuses represent an opportunity for each executive officer to
earn additional cash compensation in an amount tied to a percentage of each such
officer's base salary. The percentages of base salary targeted for bonus  payout
for  executive officers for 1995 were established by the Compensation Committee.
Actual bonus payments to such executive officers depend upon the extent to which
Protocol achieves  its  profit plan  for  the  year. Actual  bonus  payments  to
executive  officers (other than Mr. Fee) for 1995 ranged from 22% to 26% of base
salary, reflecting Protocol's partial achievement  of its profit plan for  1995.
Mr. Fee's bonus plan for 1995 was based on Company sales and expense levels, and
such bonus payment amounted to approximately 65% of base salary for 1995.
 
    STOCK  PLANS.   The long-term,  performance-based compensation  of executive
officers takes the form of option  awards under Protocol's 1992 Stock  Incentive
Plan  (the "1992 Plan"), which is designed to align a significant portion of the
executive compensation program  with long-term shareholder  interests. The  1992
Plan  permits the granting of several different types of stock-based awards. The
Compensation Committee  believes  that equity-based  compensation  ensures  that
Protocol's  executive officers have a continuing  stake in the long-term success
of Protocol. All options granted by Protocol have been granted with an  exercise
price  equal to the market price of Protocol's Common Stock on the date of grant
and, accordingly, will only have value  if Protocol's stock price increases.  In
granting options under the 1992 Plan, the Compensation Committee generally takes
into  account each  executive's responsibilities, relative  position in Protocol
and past grants.
 
    CHIEF EXECUTIVE OFFICER COMPENSATION.  Effective June 25, 1995, the Board of
Directors acting on the recommendation of the Compensation Committee,  increased
Mr. Moon's salary from $150,000 to $165,000. In developing its recommendation as
to  Mr.  Moon's  compensation, the  Committee  considered a  number  of factors,
including  surveys  and  analyses  of  compensation  levels  in  similarly-sized
companies  in  the same  industry, analyses  of  compensation levels  in similar
companies  in  Protocol's   local  geographic  area   and  Protocol's   improved
performance in revenue and net income in 1994 as
 
                                       61
<PAGE>
compared  to 1993. Mr. Moon received a bonus for 1995 of $40,500, which was paid
in accordance with  the terms of  a bonus plan  established by the  Compensation
Committee  for Mr. Moon for 1995. The 1995 bonus plan for Mr. Moon established a
target bonus of 42%  of his base  salary. The plan  also established a  specific
objective  target level  for Protocol's 1995  net operating  income before taxes
that had to be  achieved for Mr.  Moon to receive the  target bonus. Mr.  Moon's
actual bonus for 1995 amounted to approximately 26% of his base salary for 1995,
reflecting  partial achievement of target levels  of sales, net income and stock
price.
 
                                          COMPENSATION COMMITTEE
 
                                          William New, Jr.
                                          Keith R. Larson
                                          Frank E. Samuel, Jr.
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
    During the  fiscal  year  ended  December  31,  1995,  the  members  of  the
Compensation Committee were Messrs. Larson and Samuel and Dr. New.
 
STOCK PERFORMANCE GRAPH
 
    The  following  graph  compares  the monthly  cumulative  total  returns for
Protocol, the Nasdaq Stock Market Index and an index of peer companies  selected
by Protocol.
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
                               NASDAQ
<S>        <C>            <C>               <C>
                Protocol      Stock Market   Self-Determined
           Systems, Inc.    (US Companies)        Peer Group
3/24/92          100.000           100.000           100.000
3/31/92           93.617            97.473            96.782
4/30/92           72.340            93.292            93.049
5/29/92           46.808            94.500           102.804
6/30/92           42.553            90.795            96.849
7/31/92           55.319            94.006           100.791
8/31/92           53.191            91.144            91.521
9/30/92           59.574            94.542            97.424
10/30/92          54.255            98.268           104.093
11/30/92          56.383           106.086           116.019
12/31/92          65.957           108.988           111.888
1/29/93           76.596           113.125            97.301
2/26/93           63.830           108.921            81.591
3/31/93           59.574           112.071            74.994
4/30/93           48.936           107.272            68.700
5/28/93           59.574           113.883            74.530
6/30/93           67.021           114.214            73.619
7/30/93           76.596           114.317            72.560
8/31/93           81.915           120.238            73.196
9/30/93           89.362           123.806            72.210
10/29/93          87.234           126.588            75.437
11/30/93          85.106           122.792            75.491
12/31/93          91.489           126.208            74.041
1/31/94           78.723           130.041            81.321
2/28/94           91.489           128.841            84.049
3/31/94           85.106           120.917            76.828
4/29/94           63.830           119.340            80.259
5/31/94           66.090           119.632            82.130
6/30/94           53.191           116.260            79.936
7/29/94           61.702           117.638            78.872
8/31/94           70.213           125.139            82.484
9/30/94           76.596           124.800            83.405
10/31/94          78.723           127.278            92.274
11/30/94          78.723           123.059            95.770
12/30/94          76.596           123.417            94.615
1/31/95           84.043           124.116            96.429
2/28/95           74.468           130.681            97.245
3/31/95           92.553           134.549           102.069
4/28/95           80.851           138.793           102.824
5/31/95           79.787           142.382           110.600
6/30/95           85.106           153.944           113.041
7/31/95           92.553           165.248           126.520
8/31/95          100.532           168.586           129.622
9/30/95           97.872           172.474           127.130
10/31/95          85.106           171.491           142.024
11/30/95          88.298           175.502           144.611
12/29/95          89.362           174.562           146.523
1/31/96          106.383           175.364           151.462
2/29/96          123.404           182.059           158.173
3/31/96          143.617           182.838           151.982
4/30/96          165.957           197.881           121.431
</TABLE>
 
    The  total  cumulative  return on  investment  (change in  stock  price plus
reinvested dividends) for each of the  periods for Protocol, the peer group  and
the  Nasdaq Stock Market Index is based on the stock price or index on March 24,
1992, the date of Protocol's initial public offering.
 
    The above graph compares the performance of Protocol with that of the Nasdaq
Stock Market Index and a group of peer companies with the investment weighted on
market capitalization. Companies  in the  peer group are  as follows:  SpaceLabs
Medical, Inc., Datascope Corp., Criticare Systems, Inc., Nellcor Puritan Bennett
and Marquette Electronics, Inc.
 
                                       62
<PAGE>
SECTION 16 REPORTS
 
    Section  16(a) of the Securities Exchange Act of 1934, as amended (the "1934
Act") requires Protocol's directors and officers, and persons who own more  than
10%  of  a registered  class of  Protocol's equity  securities, to  file initial
reports of ownership and reports of changes in ownership with the Securities and
Exchange Commission. Such  persons also  are required to  furnish Protocol  with
copies of all Section 16(a) reports they file.
 
    Based solely on its review of the copies of such reports received by it with
respect  to  fiscal  1995,  or written  representations  from  certain reporting
persons, Protocol  believes  that  all filing  requirements  applicable  to  its
directors,  officers and persons who own more  than 10% of a registered class of
Protocol's equity securities have been complied with for fiscal 1995.
 
                                       63
<PAGE>
                       STOCK OWNED BY PROTOCOL MANAGEMENT
                           AND PRINCIPAL SHAREHOLDERS
 
    The following table sets forth  certain information regarding the  ownership
of the Common Stock as of May 6, 1996, with respect to: (i) each person known by
Protocol  to beneficially own more  than 5% of the  outstanding shares of Common
Stock, (ii) each of Protocol's continuing directors and nominees, (iii) each  of
Protocol's  named  executive  officers,  and (iv)  all  directors  and executive
officers as a group.
 
<TABLE>
<CAPTION>
                                                                       SHARES OF COMMON STOCK     PERCENT OF COMMON
NAME AND BUSINESS ADDRESS                                              BENEFICIALLY OWNED (1)     STOCK OUTSTANDING
- ---------------------------------------------------------------------  -----------------------  ---------------------
<S>                                                                    <C>                      <C>
Wellington Management Company (2) ...................................            802,900                  10.8
 75 State Street
 Boston, MA 02109
INVESCO PLC (3) .....................................................            671,200                   9.0
 11 Devonshire Square
 London EC2M 4YR
 England
U.S. Bancorp (4) ....................................................            639,406                   8.6
 111 S.W. Fifth Avenue
 Suite 1540
 Portland, OR 97204
David F. Bolender ...................................................              3,000                  *
Ronald S. Newbower ..................................................            --                      --
Frank E. Samuel, Jr. ................................................              6,000                  *
William New, Jr., M.D. ..............................................             33,000                  *
Steven E. Wynne .....................................................            --                      --
James B. Moon .......................................................             90,777                   1.2
Craig M. Swanson (5) ................................................            114,096                   1.5
James P. Fee, Jr. ...................................................             83,650                   1.1
Carl P. Hollstein, Jr. ..............................................             25,949                  *
Lawrence C. Gray ....................................................             20,500                  *
James P. Welch ......................................................             24,471                  *
Executive Officers and Directors as a group (12 persons) .                       410,324                   5.3
</TABLE>
 
- ------------------------
*less than one percent
 
(1) Beneficial ownership is determined in accordance with rules of the SEC,  and
    includes  voting power and  investment power with  respect to shares. Shares
    issuable upon the exercise of  outstanding stock options that are  currently
    exercisable  or become exercisable  within 60 days from  March 15, 1996, are
    considered outstanding  for the  purpose of  calculating the  percentage  of
    Common  Stock owned by such  person, but not for  the purpose of calculating
    the percentage of  Common Stock  owned by any  other person.  The number  of
    shares  that are  issuable upon the  exercise of options  that are currently
    exercisable or exercisable within 60 days of May 6, 1996, is as follows: Mr.
    Samuel -- 6,000;  Dr. New  -- 33,000;  Mr. Moon  -- 34,075;  Mr. Swanson  --
    79,167;  Mr. Fee -- 79,834; Mr. Gray -- 20,500; Mr. Hollstein -- 22,500; Mr.
    Welch -- 23,834; and all directors and  officers as a group -- 305,910.  The
    table  does not include  shares subject to  options that will  be granted to
    Messrs. Bolender, New, Samuel and Wynne under the 1993 Stock Option Plan for
    Nonemployee Directors immediately after the Protocol Annual Meeting.
 
                                       64
<PAGE>
(2) This information as to beneficial ownership is based on a Schedule 13G filed
    by Wellington Management  Company ("WMC") with  the Securities and  Exchange
    Commission  on February 9,  1996. The Schedule  13G states that  WMC, in its
    capacity as investment advisor, may be deemed to be the beneficial owner  of
    802,900  shares  of Protocol's  Common Stock,  which  are owned  by numerous
    investment counseling clients. The Schedule  13G states that WMC has  shared
    voting  power as to  189,000 shares and  has shared dispositive  power as to
    802,900 shares of Common Stock.
 
(3) This information as to beneficial ownership is based on a Schedule 13G filed
    by INVESCO PLC, INVESCO North  American Group, Ltd., INVESCO, Inc.,  INVESCO
    North  American  Holdings,  Inc.  and INVESCO  Funds  Group,  Inc.  with the
    Securities and Exchange Commission  on February 14,  1996. The Schedule  13G
    states  that the reporting persons have  shared voting and dispositive power
    over all of the 671,200 shares of Common Stock beneficially owned by them.
 
(4) This information as to beneficial ownership is based on information provided
    to Protocol by U.S. Bancorp Capital Corp. on March 25, 1996 as to the number
    of shares  of  Protocol Common  Stock  beneficially owned  by  U.S.  Bancorp
    Capital Corp. as of December 29, 1995.
 
(5)  Includes  6,500 shares  of Common  Stock owned  by trusts  as to  which Mr.
    Swanson serves as trustee.
 
                                       65
<PAGE>
                                PRYON MANAGEMENT
 
EXECUTIVE OFFICERS
 
    The executive officers of Pryon are as follows:
 
<TABLE>
<CAPTION>
           NAME                 AGE                                 POSITION
- --------------------------      ---      --------------------------------------------------------------
<S>                         <C>          <C>
Daniel F. Carsten                   48   President
William M. Hand                     45   Vice President-Engineering
Robert A. Dalnodar                  50   Vice President-Manufacturing
Robert H. Ricciardelli              48   Vice President-Research
Edward M. Kolasinski                37   Vice President, Chief Financial Officer and Secretary
</TABLE>
 
    Information concerning these executive officers is set forth below.
 
    DANIEL F. CARSTEN.   Mr.  Carsten is  a co-founder  of the  Company and  has
served  as President since its founding in  1988. Prior to founding the Company,
Mr. Carsten was Vice  President of Marketing and  Sales of Bear Medical  Systems
from 1982 until 1984. In late 1984, with other senior management of Bear Medical
Systems,  Mr.  Carsten left  Bear Medical  Systems  and purchased  Bird Products
Corporation from 3M in  a leveraged buyout. Bird  Products Corporation became  a
market  leader in  low cost  adult, infant  and transport  ventilators. Prior to
joining Bear Medical Systems, Mr. Carsten  spent 12 years with General  Electric
Medical  Systems,  the last  four of  which  were as  Marketing Manager  for the
Patient Monitoring Division. Mr. Carsten brings over 25 years experience in  the
medical device industry to the Company.
 
    WILLIAM  M.  HAND.   Mr.  Hand joined  Pryon in  1991  as Vice  President of
Engineering. Prior to  joining the Company,  Mr. Hand spent  three years as  the
Director  of Engineering of Medical Advances. Prior to joining Medical Advances,
Mr. Hand spent  10 years with  General Electric Medical  Systems, with his  last
position  as Manager of CT Engineering. Mr. Hand brings over 22 years experience
in the medical device industry to the Company.
 
    ROBERT A.  DALNODAR.   Mr.  Dalnodar  joined the  Company  in 1991  as  Vice
President of Manufacturing. Prior to joining the Company, Mr. Dalnodar served as
Manager  of Production  Engineering at  Astronautics Corporation  of America for
three years.  Prior  to  that,  Mr.  Dalnodar  held  various  manufacturing  and
engineering positions for 17 years with Greenheck Fan Corporation.
 
    ROBERT H. RICCIARDELLI.  Mr. Ricciardelli is a co-founder of the Company and
has  served as Vice President of Research since the Company's inception in 1988.
Prior to  co-founding the  Company,  Mr. Ricciardelli  was  a principal  in  the
startup  of Biochem International where he  was responsible for the research and
manufacturing of biomedical sensors. Prior to that, Mr. Ricciardelli spent  over
eight  years with General Electric Medical System's Blood Gas Program in various
manufacturing and engineering management positions. Mr. Ricciardelli brings over
25 years experience in the medical device industry to the Company.
 
    EDWARD M. KOLASINSKI.   Mr. Kolasinski  joined the Company  in 1990 as  Vice
President,  Finance and  Chief Financial  Officer. He  was elected  Secretary in
1993. Prior  to  joining  the  Company, Mr.  Kolasinski  spent  three  years  as
Controller  at  Rexnord Corporation.  Prior to  joining Rexnord,  Mr. Kolasinski
spent seven years with Price Waterhouse LLP, the last two of which were as Audit
Manager.
 
DIRECTORS
 
    The directors of Merger Sub at the Effective Time will become the  directors
of  the Surviving  Company, except  that pursuant  to the  Merger Agreement such
directors will promptly act to increase  the number of directors and to  appoint
Daniel F. Carsten to fill such vacancy. The directors of Merger Sub are James B.
Moon and Craig M. Swanson.
 
                                       66
<PAGE>
                          PRYON EXECUTIVE COMPENSATION
 
SUMMARY OF CASH AND CERTAIN OTHER COMPENSATION
 
    The  following  table provides  information  concerning the  compensation of
Pryon's Chief Executive  Officer and  each of  the other  executive officers  of
Pryon  (the "named executive  officers") for the fiscal  year ended December 31,
1995.
 
<TABLE>
<CAPTION>
                                                                                              LONG-TERM COMPENSATION
                                                                 ANNUAL COMPENSATION         -------------------------
                                                          ---------------------------------    SECURITIES UNDERLYING
NAME AND PRINCIPAL POSITION                                 YEAR       SALARY       BONUS      STOCK OPTIONS GRANTED
- --------------------------------------------------------  ---------  -----------  ---------  -------------------------
<S>                                                       <C>        <C>          <C>        <C>
Daniel F. Carsten.......................................       1995  $   128,832  $  45,800             --
 President and                                                 1994      127,001     --                 --
 Chief Executive Officer                                       1993      120,209     --                 --
Edward M. Kolasinski....................................       1995       79,370     25,000              1,000
 Vice President Finance, Chief                                 1994       81,712     --                  1,000
 Financial Officer and Secretary                               1993       73,979     --                 --
William M. Hand.........................................       1995       95,452     27,200                800
 Vice President,                                               1994       91,503     --                  1,000
 Engineering                                                   1993       85,344     --                 --
Robert A. Dalnodar......................................       1995       78,524     24,500              1,050
 Vice President,                                               1994       71,310     --                  1,250
 Manufacturing                                                 1993       73,485     --                    200
</TABLE>
 
STOCK OPTIONS
 
    The following table  sets forth  information concerning  options granted  to
Pryon  named executive  officers during the  year ended December  31, 1995 under
Pryon's 1991 and 1994 Stock Option Plans.
 
                       OPTION GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                         NUMBER OF
                                                        SECURITIES
                                                        UNDERLYING      PERCENT OF TOTAL
                                                          OPTIONS      OPTIONS GRANTED TO    EXERCISE PRICE   EXPIRATION
NAME                                                    GRANTED (1)     EMPLOYEES IN 1995     PER SHARE (2)      DATE
- -----------------------------------------------------  -------------  ---------------------  ---------------  ----------
<S>                                                    <C>            <C>                    <C>              <C>
Daniel F. Carsten....................................       --                 --                  --             --
Edward M. Kolasinski.................................        1,000               16.0%          $    8.00       10/01/05
William M. Hand......................................          800               12.8                8.00       10/01/05
Robert A. Dalnodar...................................        1,050               16.8                8.00       10/01/05
</TABLE>
 
- ------------------------
(1) Options granted in 1995 vest March 31, 1996.
 
(2) On or before the Closing Date, all outstanding options to purchase shares of
    Pryon Common  Stock issued  pursuant  to the  Pryon Corporation  1991  Stock
    Option  Plan and the Pryon Corporation 1994 Stock Option Plan, as applicable
    ("Existing Option') whether or not vested or exercisable, shall be  replaced
    by  an option  (a "Replacement  Option") to acquire,  on the  same terms and
    conditions as were applicable under the Existing Option, a number of  shares
    of  Protocol  Common Stock  equal to  the  product of  (a) the  Common Stock
    Exchange Ratio as determined  in accordance with the  Agreement and Plan  of
    Merger  and (b) the number of shares  of Pryon Common Stock which the holder
    would have been  entitled to receive  upon exercise of  the Existing  Option
    (whether  or not the Existing Option  would then have been exercisable). The
    price per share under the Replacement Option shall be equal to the aggregate
    exercise price for the shares subject to the Existing Option divided by  the
    number  of shares of Protocol Common Stock deemed to be purchasable pursuant
    to the Replacement Option. The  potential realizable value on these  options
    is reflected in the table below.
 
                                       67
<PAGE>
OPTION EXERCISE AND HOLDINGS
 
    The  following  table  provides  information,  with  respect  to  the  named
executive officers, concerning the  exercise of options  during the last  fiscal
year and unexercised options held as of December 31, 1995.
 
<TABLE>
<CAPTION>
                                                               NUMBER OF SECURITIES        VALUE OF UNEXERCISED
                                                              UNDERLYING UNEXERCISED     IN-THE- MONEY OPTIONS AT
                                                                OPTION AT YEAR END             YEAR END (1)
                                                            --------------------------  --------------------------
NAME                                                        EXERCISABLE  UNEXERCISABLE  EXERCISABLE  UNEXERCISABLE
- ----------------------------------------------------------  -----------  -------------  -----------  -------------
<S>                                                         <C>          <C>            <C>          <C>
Daniel F. Carsten.........................................       2,700        --        $   352,134   $   --
Edward M. Kolasinski......................................       2,300         1,000        297,426       124,620
William M. Hand...........................................       2,100         1,200        271,302       151,944
Robert A. Dalnodar........................................       1,965         1,335        252,893       167,702
</TABLE>
 
- ------------------------
(1)  The value  of unexercised in-the-money  options is based  on the difference
    between $132.62,  which is  the  implicit value  of  Pryon Common  Stock  on
    February  20, 1996 (the date of the announcement of the definitive agreement
    to be acquired by Protocol) and the applicable exercise price.
 
DIRECTOR COMPENSATION
 
    The members of Pryon's Board  of Directors are reimbursed for  out-of-pocket
and   travel  expenses  incurred  in  attending  Board  meetings.  In  addition,
nonemployee members of the Board of Directors receive annual compensation in  an
amount  equal to 5% of  the base compensation of  the Chief Executive Officer of
Pryon. Two members of the Board have waived this compensation.
 
               CERTAIN TRANSACTIONS AND RELATIONSHIPS WITH PRYON
 
    Pryon is indebted to each of  Daniel F. Carsten, Robert H. Ricciardelli  and
Robert  M. Sommer, which  indebtedness is evidenced by  a Pryon Promissory Note,
each dated July 1,  1995, and each  in the principal  amount of $75,429.00  (the
"Promissory  Notes"),  plus any  accrued and  unpaid interest.  The indebtedness
evidenced by  the Promissory  Notes is  subordinate to  certain indebtedness  of
Pryon  to its senior bank lender. Pursuant to the Merger Agreement, Protocol has
committed at or within ten days after the Closing to cause Pryon to pay in  full
each of the Promissory Notes.
 
                                       68
<PAGE>
           STOCK OWNED BY PRYON MANAGEMENT AND PRINCIPAL SHAREHOLDERS
 
    The  following table sets forth  certain information regarding the ownership
of Pryon Common Stock as of June 3, 1996 with respect to: (i) each person  known
by  Pryon to beneficially  own more than  5% of the  outstanding shares of Pryon
Common Stock, (ii) each  of the Pryon's directors,  (iii) each of Pryon's  named
executive officers, and (iv) all Pryon directors and officers as a group.
 
<TABLE>
<CAPTION>
                                                                                                    PERCENTAGE OF
                                                                        SHARES OF COMMON STOCK      COMMON STOCK
NAME AND BUSINESS ADDRESS                                               BENEFICIALLY OWNED (1)       OUTSTANDING
- ----------------------------------------------------------------------  -----------------------  -------------------
<S>                                                                     <C>                      <C>
Greylock Capital Limited Partnership (2) .............................            56,975                   24.4%
 Greylock Limited Partnership
 Howard E. Cox, Jr.
 One Federal Street
 Boston, MA 02110
 
Frontenac Venture V Limited Partnership (3) ..........................            40,861                   17.5
 James E. Crawford, III
 135 South La Salle Street
 Suite 3800
 Chicago, IL 60603
 
Baird Capital Partners' Limited Partnership (4) ......................            18,573                    8.0
 RWBCO II Partners' Limited Partnership
 777 East Wisconsin Avenue
 Suite 3350
 Milwaukee, WI 53202
 
Venture Capital Fund Limited Partnership (5) .........................            12,119                    5.2
 David J. Lubar
 777 East Wisconsin Avenue
 Milwaukee, WI 53202
 
Robert M. Sommer (6)..................................................            19,661                    8.4
 
Felix T. Troilo (7)...................................................             6,842                    2.9
 
Daniel F. Carsten.....................................................            24,650                   10.6
 
Robert H. Ricciardelli................................................            20,490                    8.8
 
William M. Hand.......................................................             3,800                    1.6
 
Robert A. Dalnodar....................................................             3,440                    1.5
 
Edward M. Kolasinski..................................................             3,300                    1.4
 
Executive Officers and Directors as a Group (6 Persons)(8)............            62,522                   26.8
</TABLE>
 
- ------------------------
(1)  Beneficial ownership is determined in accordance with rules of the SEC, and
    includes voting power and investment  power with respect to shares.  Pryon's
    Series  A  Preferred Stock  and Series  B Preferred  Stock are  Common Stock
    equivalents with  respect  to voting  and  investment power  and  have  been
    included  in the calculation  as if converted on  a one-to-one basis. Shares
    issuable upon the exercise of  outstanding stock options that are  currently
    exercisable  or  become exercisable  within 60  days from  June 3,  1996 are
    considered outstanding  for the  purpose of  calculating the  percentage  of
    Common  Stock owned by such persons, but  not for the purpose of calculating
    the percentage of  Common Stock  owned by any  other person.  The number  of
    shares  that are  issuable upon the  exercise of options  that are currently
    exercisable or exercisable within
 
                                       69
<PAGE>
    60 days  of  June  3,  1996  is  as  follows:  Mr.  Carsten  --  2,700;  Mr.
    Ricciardelli  --  500;  Mr.  Hand  --  3,300;  Mr.  Dalnodar  --  3,140; Mr.
    Kolasinski 3,300; and all directors and officers as a group -- 12,740.
 
(2) Greylock  Capital  Limited  Partnership  and  Greylock  Limited  Partnership
    combined  ownership in Pryon is represented by 40,302 shares of Pryon Series
    A Preferred Stock and 16,673 shares  of Pryon Series B Preferred Stock.  Mr.
    Cox,  a director of Pryon, is a  general partner of Greylock Capital Limited
    Partnership  and  Greylock  Limited   Partnership  and  shares  voting   and
    investment  power  with  respect  to  such  shares.  However,  he  disclaims
    beneficial  ownership  of  such  shares  except  as  to  his   proportionate
    partnership interest therein.
 
(3) Frontenac Venture V Limited Partnership ownership in Pryon is represented by
    40,681 shares of Pryon Series B Preferred Stock. Mr. Crawford, a director of
    Pryon,  is a general partner  of the general partner  of Frontenac Venture V
    Limited. Partnership and  may be deemed  to be the  beneficial owner of  the
    Pryon Stock owned by the partnership.
 
(4)  Baird Capital Partners' Limited Partnership  and RWBCO II Partners' Limited
    Partnership combined ownership in Pryon  is represented by 18,573 shares  of
    Pryon Series B Preferred Stock.
 
(5)  Venture Capital Fund Limited Partnership  ownership in Pryon is represented
    by 9,024 shares of Pryon Series A Preferred Stock and 3,095 shares of  Pryon
    Series  B Preferred Stock. Mr. Lubar, a  director of Pryon, is the President
    of Lubar  &  Co.,  the  general partner  of  Venture  Capital  Fund  Limited
    Partnership, and may be deemed to be the beneficial owner of the Pryon Stock
    owned by the partnership.
 
(6) Mr. Sommer's ownership in Pryon is represented by 752 shares of Pryon Series
    A  Preferred Stock,  18,409 shares of  Common Stock and  500 shares issuable
    upon exercise of options.
 
(7) Mr. Troilo's  ownership in  Pryon is represented  by 6,016  shares of  Pryon
    Series A Preferred Stock and 826 shares of Pryon Series B Preferred Stock.
 
(8)  Executive officers of Pryon  as a group own 1,411  shares of Pryon Series A
    Preferred Stock.
 
                                       70
<PAGE>
                         ELECTION OF PROTOCOL DIRECTORS
 
    At the Protocol Annual  Meeting, two directors will  be elected, each for  a
three-year term. Unless otherwise specified on the proxy, it is the intention of
the  persons named in the proxy to  vote the shares represented by each properly
executed proxy  for the  election as  directors of  the persons  named below  as
nominees.  The  Board of  Directors believes  that the  nominees will  stand for
election and  will serve  if elected  as directors.  However, if  either of  the
persons  nominated by the Board  of Directors fails to  stand for election or is
unable to accept election, the  proxies will be voted  for the election of  such
other person as the Board of Directors may recommend.
 
    Under  Protocol's  bylaws,  the  directors are  divided  into  three classes
composed of  two  directors each.  The  term of  office  of only  one  class  of
directors  expires in each year,  and their successors are  elected for terms of
three years and until  their successors are elected  and qualified. There is  no
cumulative voting for election of directors.
 
    If  the Merger is consummated, the Protocol  Board will increase the size of
the Protocol Board of Directors from six to seven members and appoint Daniel  F.
Carsten  to the Protocol Board for a term expiring at the 1997 Annual Meeting of
Protocol Shareholders. See "PRYON MANAGEMENT" for certain information about  Mr.
Carsten.
 
    INFORMATION  AS TO NOMINEES  AND CONTINUING DIRECTORS.   The following table
sets forth the  names of  the Board  of Directors'  nominees for  election as  a
director  and  those directors  who will  continue to  serve after  the Protocol
Annual Meeting. Also set forth is certain other information with respect to each
such person's age at  April 1, 1996, principal  occupation or employment  during
the  past five years,  the periods during which  he has served  as a director of
Protocol and positions currently held with Protocol.
 
<TABLE>
<CAPTION>
                                                                       DIRECTOR    EXPIRATION
                                                             AGE         SINCE       OF TERM    POSITIONS HELD WITH PROTOCOL
                                                             ---      -----------  -----------  ----------------------------
<S>                                                      <C>          <C>          <C>          <C>
NOMINEES:
  Steven E. Wynne......................................          44       --             1999   --
  David F. Bolender....................................          63       --             1999   --
CONTINUING DIRECTORS:
  Ronald S. Newbower, Ph.D.............................          52         1994         1997   Director
  Frank E. Samuel, Jr..................................          56         1994         1997   Director
  William New, Jr., M.D................................          53         1992         1998   Director
  James B. Moon........................................          50         1987         1998   Chairman of the Board,
                                                                                                President, Chief Executive
                                                                                                Officer and Director
</TABLE>
 
    STEVEN E. WYNNE.   Mr.  Wynne has served  as President  and Chief  Executive
Officer of adidas America since 1995. Mr. Wynne was a partner in the law firm of
Ater  Wynne Hewitt  Dodson &  Skerritt, Protocol's  legal counsel,  from 1984 to
1996.
 
    DAVID F. BOLENDER.  Mr.  Bolender is Chairman of  the Board of Directors  of
Electro  Scientific Industries, Inc. and has served in that capacity since 1992.
From January  1989 to  December 1991  Mr. Bolender  served as  President of  the
Electric  Operations Group  of PacifiCorp. Mr.  Bolender serves on  the Board of
Directors of U.S. Bank of Oregon.
 
    RONALD S.  NEWBOWER,  PH.D.   Dr.  Newbower  was  elected to  the  Board  of
Directors  in 1994.  Dr. Newbower has  been Senior Vice  President, Research and
Technology, since  1994  and was  Vice  President for  Research  and  Technology
Affairs  of  the Massachusetts  General Hospital  ("MGH") and  Associate General
Director for  Research and  Technology Affairs  of MGH  from 1990  to 1994.  Dr.
Newbower  has held appointments at MGH since 1973, where he has served as Deputy
Director of the Division of Research Affairs, Director of Technology Development
of the  Office  of  Technology  Affairs,  and  Director  of  the  Department  of
Biomedical Engineering. He is currently also Associate
 
                                       71
<PAGE>
Professor   of  Anaesthesia,   Harvard-MIT  Division  of   Health  Sciences  and
Technology, Associate  Professor of  Anaesthesia,  Harvard Medical  School,  and
Lecturer in Electrical Engineering, Massachusetts Institute of Technology.
 
    FRANK  E. SAMUEL, JR.   Mr. Samuel was elected to  the Board of Directors in
1994. Mr. Samuel has been President of Edison Biotechnology Center, an  economic
development  organization for  the biomedical technology  field in  the state of
Ohio, since February  1995. Prior to  that date, Mr.  Samuel was an  independent
consultant engaged in the business of advising senior management on governmental
policy  and regulation  of health  care and  medical technology  since 1990. Mr.
Samuel was President of the Health Industry Manufacturers Association  ("HIMA"),
a national trade association representing medical technology manufacturers, from
1984  to  1989. Mr.  Samuel also  serves on  the Boards  of Directors  of STERIS
Corporation and Life Technologies, Inc.
 
    WILLIAM NEW, JR., M.D.   Dr. New  was elected to the  Board of Directors  in
1992.  Dr. New was  a founder of  Nellcor, a manufacturer  of electronic patient
monitoring and measurement instruments.  He served as a  member of the Board  of
Directors of Nellcor from 1981 to 1989, and as Chairman from 1981 to 1988. Since
August  1991,  Dr. New  has been  Chairman of  the Board  of Directors  of Natus
Medical,  Inc.,  which  designs  and  manufactures  infant  hearing   assessment
products.  Since August 1991, Dr. New also has served as Chief Executive Officer
of the Novent Group, a medical industry consulting firm.
 
    JAMES B. MOON.  Mr.  Moon joined Protocol in  September 1986 and became  its
President and Chief Executive Officer in 1987. He also serves as Chairman of the
Board  of Directors. Mr. Moon  came to Protocol from  SpaceLabs, Inc., a medical
instrument manufacturer, where he was director of systems architecture for  five
years. Previously, he was an engineering manager for Intel Corporation. Mr. Moon
also serves on the Board of Directors of OrCAD, Inc.
 
    BOARD OF DIRECTORS COMMITTEES AND NOMINATIONS BY SHAREHOLDERS.  The Board of
Directors  acts as a nominating committee for selecting nominees for election as
directors. Protocol's bylaws  also permit shareholders  to make nominations  for
the  election  of directors,  if such  nominations are  made pursuant  to timely
notice in  writing  to  Protocol's  Secretary. To  be  timely,  notice  must  be
delivered  to, or mailed to and received  at, the principal executive offices of
Protocol not less than 60 days  nor more than 90 days  prior to the date of  the
meeting,  provided that at least  60 days' notice or  prior public disclosure of
the date of the meeting is given or made to shareholders. If less than 60  days'
notice or prior public disclosure of the date of the meeting is given or made to
shareholders,  notice  by  the shareholder  to  be  timely must  be  received by
Protocol not later than  the close of  business on the  tenth day following  the
date  on which such notice of the date  of the meeting was mailed or such public
disclosure was made. A  shareholder's notice of nomination  must also set  forth
certain  information specified in Article III, Section 3.15 of Protocol's bylaws
concerning each person the shareholder proposes to nominate for election and the
nominating shareholder.
 
    The Board  of Directors  has  appointed a  standing Audit  Committee  which,
during  the fiscal  year ended December  31, 1995, conducted  four meetings. The
members of the  Audit Committee currently  are Messrs. Larson  and Dishlip.  The
Audit  Committee  reviews  the  scope  of  the  independent  annual  audit,  the
independent public accountants' letter to the Board of Directors concerning  the
effectiveness  of Protocol's internal financial  and accounting controls and the
Board of Directors' response to that  letter, if deemed necessary. The Board  of
Directors  also has appointed  a Compensation Committee  which reviews executive
compensation and makes recommendations  to the full  Board regarding changes  in
compensation,  and also  administers Protocol's  stock option  plans. During the
fiscal year  ended  December  31,  1995, the  Compensation  Committee  held  one
meeting. The members of the Compensation Committee currently are Messrs. Larson,
Samuel and Dr. New.
 
    During  1995 Protocol's Board of Directors held six meetings. Each incumbent
director attended more than 75% of the aggregate of the total number of meetings
held by the  Board of Directors  and the total  number of meetings  held by  all
committees of the Board on which he served during the period that he served.
 
                                       72
<PAGE>
    See "Management -- Executive Compensation" for certain information regarding
compensation of directors.
 
    THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS THAT SHAREHOLDERS VOTE FOR THE
ELECTION OF ITS NOMINEES FOR DIRECTOR. If a quorum is present, Protocol's bylaws
provide  that directors  are elected  by a  plurality of  the votes  cast by the
shares entitled  to  vote. Abstentions  and  broker non-votes  are  counted  for
purposes  of determining whether a quorum exists at the Protocol Annual Meeting,
but are  not counted  and  have no  effect on  the  determination of  whether  a
plurality exists with respect to a given nominee.
 
          APPROVAL OF AMENDMENT TO PROTOCOL 1992 STOCK INCENTIVE PLAN
 
    A  total of 875,000 shares  of Common Stock have  been reserved for issuance
under Protocol's 1992 Stock Incentive Plan (the "1992 Plan"). As of May 6, 1996,
only 121,276 shares remained available for grant under the 1992 Plan. The  Board
of  Directors believes that the availability of stock incentives is an important
factor in Protocol's  ability to  attract and retain  experienced and  competent
employees  and to provide  an incentive to  them to exert  their best efforts on
behalf of Protocol. The Board of Directors believes that additional shares  will
be needed under the 1992 Plan to provide appropriate incentives. Accordingly, on
March  7, 1996, the Board  of Directors approved an  amendment to the 1992 Plan,
subject to  shareholder approval,  to reserve  an additional  461,422 shares  of
Common  Stock under the 1992 Plan, thereby increasing the total number of shares
reserved for issuance under the Plan from 875,000 shares to 1,336,422 shares.
 
    Protocol  has  utilized  stock  option  grants  broadly  to  recognize   key
performers  at every  level throughout the  organization. Grants  have also been
used to  provide a  link  between employees  and  the performance  of  Protocol.
Protocol  believes it is  critical in developing the  organization to provide an
opportunity for employees to be equity holders and to understand the part  their
contributions  can  have in  the success  of the  organization. Of  the proposed
461,422 additional shares, approximately  211,422 shares (subject to  adjustment
based  upon the exchange ratio determined according to the Merger Agreement) are
to be used for the replacement of outstanding Pryon employee stock options,  and
the  balance,  approximately  250,000  shares, is  targeted  for  recruitment of
employees and future incentives  for employees of  Protocol and Pryon  following
the Merger. The shares specified here for Pryon option replacements are included
in the additional shares being requested as part of the Merger Agreement.
 
    The  following is a  summary of the  basic terms and  provisions of the 1992
Plan.
 
    The 1992 Plan, which was approved by Protocol's shareholders on January  21,
1992,  provides for grants of both  "incentive stock options" within the meaning
of Section 422 of the Internal Revenue Code of 1986, as amended (the "Code") and
"non-qualified stock  options"  which  are not  qualified  for  treatment  under
Section  422 of the Code, and for direct  stock grants and sales to employees or
consultants of Protocol. The purposes of the 1992 Plan are to attract and retain
the best available  personnel for  positions of  substantial responsibility,  to
provide  additional incentives to the employees  and consultants of Protocol and
to promote business. The 1992 Plan is administered by the Compensation Committee
of the Board of Directors.
 
    The term of each option granted under  the 1992 Plan will be ten years  from
the  date of grant, or such shorter period  as may be established at the time of
the grant. An option granted under the 1992 Plan may be exercised at such  times
and  under such  conditions as  determined by  the Compensation  Committee. If a
person who has been granted an option ceases to be an employee or consultant  of
Protocol,  such  person may  exercise that  option only  during the  three month
period after the date of termination, and only to the extent that the option was
exercisable on the date of termination. No option granted under the 1992 Plan is
transferable other than at death, and each option is exercisable during the life
of the optionee only by the optionee. In the event of the death of a person  who
has
 
                                       73
<PAGE>
received  an  option, the  option generally  may  be exercised  by a  person who
acquired the option  by bequest or  inheritance during the  twelve month  period
after  the date of death  to the extent that such  option was exercisable at the
date of death.
 
    The exercise price of options  granted under the 1992  Plan may not be  less
than  the fair market value of  a share of Common Stock  on the date of grant of
the option. The consideration to be  paid upon exercise of an option,  including
the  method of payment, will be determined by the Compensation Committee and may
consist entirely of cash, check, promissory note, shares of Common Stock or  any
combination  of  such  methods  of  payment  as  permitted  by  the Compensation
Committee.
 
    Certain options authorized to be granted under the 1992 Plan are intended to
qualify as  incentive  stock options  for  federal income  tax  purposes.  Under
federal  income  tax law  currently in  effect, the  optionee will  recognize no
income upon grant or upon a proper exercise of an incentive stock option. If  an
employee  exercises an incentive stock option and does not dispose of any of the
option shares within two years following the  date of grant and within one  year
following  the  date  of  exercise,  then  any  gain  realized  upon  subsequent
disposition of the shares will be treated as income from the sale or exchange of
a capital asset. If an employee disposes of shares acquired upon exercise of  an
incentive  stock option  before the  expiration of  either the  one-year holding
period or the two-year  waiting period, any amount  realized will be taxable  as
ordinary  compensation income in  the year of  such disqualifying disposition to
the extent  that the  lesser of  the  fair market  value of  the shares  on  the
exercise  date or the fair market value of the shares on the date of disposition
exceeds the  exercise price.  Protocol will  not be  allowed any  deduction  for
federal  income tax purposes at  either the time of the  grant or exercise of an
incentive stock  option.  Upon any  disqualifying  disposition by  an  employee,
Protocol  will be entitled  to a deduction  to the extent  the employee realized
ordinary income.
 
    Certain options authorized to be granted under the 1992 Plan will be treated
as non-qualified stock options  for federal income  tax purposes. Under  federal
income  tax law presently in  effect, no income is realized  by the grantee of a
non-qualified stock  option  pursuant to  the  1992  Plan until  the  option  is
exercised. At the time of exercise of a non-qualified stock option, the optionee
will  realize ordinary compensation  income, and Protocol will  be entitled to a
deduction, in the amount by which the market value of the shares subject to  the
option  at the time of exercise exceeds the exercise price. Protocol's deduction
is conditioned upon withholding  on the income amount.  Upon the sale of  shares
acquired upon exercise of a non-qualified stock option, the excess of the amount
realized  from the  sale over  the market  value of  the shares  on the  date of
exercise will be taxable.
 
    The 1992 Plan will continue in effect until January 1, 2002, unless  earlier
terminated  by the Board of Directors, but  such termination will not affect the
terms of any options outstanding at that time. The Board of Directors may amend,
terminate or  suspend the  1992 Plan  at any  time, provided  that no  amendment
regarding amount, price or timing of the grants may be made more than once every
six months other than to comport with changes in certain Securities Exchange Act
and  Internal  Revenue  Code  requirements.  Amendments  that  would  materially
increase the  number  of  shares  that may  be  issued,  materially  modify  the
requirements  as to eligibility  for Plan participation,  or materially increase
the benefits to Plan participants must be approved by shareholders.
 
                                       74
<PAGE>
    Set forth below is information as to  the number of stock options that  have
been  granted under the  1992 Plan to  the persons and  groups identified in the
table as of May  6, 1996. The closing  price of the Common  Stock on the  Nasdaq
Stock Market was $24.88 on May 31, 1996.
 
<TABLE>
<CAPTION>
                                                                                      NUMBER OF OPTIONS
NAME AND PRINCIPAL POSITION                                                                GRANTED
- ------------------------------------------------------------------------------------  ------------------
<S>                                                                                   <C>
James B. Moon ......................................................................          90,000
 President, Chief Executive Officer and
 Chairman of the Board
Craig M. Swanson ...................................................................          48,000
 Vice President, Finance, Chief Financial Officer
 and Secretary
James P. Fee, Jr. ..................................................................          46,000
 Vice President, Marketing and Sales
Lawrence C. Gray, ..................................................................          22,000
 Vice President, Engineering
Carl P. Hollstein, Jr., ............................................................          40,000
 Vice President, Manufacturing
James P. Welch .....................................................................          21,000
 Vice President, Quality Systems
Executive Officers as a group (7 persons)...........................................         301,000
Directors (other than Executive Officers)
 as a group (5 persons).............................................................          20,000
Employees (other than Executive Officers)
 as a group (219 persons)...........................................................         488,333
</TABLE>
 
    THE  BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE FOR THIS PROPOSAL. The
proposal must be approved by  the affirmative vote of  holders of a majority  of
the  outstanding  shares  of  Protocol  Common  Stock.  Abstentions  and  broker
non-votes are  treated as  "no" votes  in determining  whether the  proposal  is
approved.  The  proxies will  be voted  for or  against the  proposal, or  as an
abstention, in accordance with the instructions specified on the proxy form.  If
no  instructions are given, proxies will be  voted for approval of the amendment
to the 1992 Plan.
 
           APPROVAL OF AMENDMENTS TO PROTOCOL 1993 STOCK OPTION PLAN
                           FOR NONEMPLOYEE DIRECTORS
 
    The Board of Directors has approved, and recommends shareholder adoption of,
amendments to Protocol's 1993 Plan that would (i) increase the size of the stock
option granted to a nonemployee director upon such director's first election  or
appointment  to the Board of  Directors from 3,000 shares  to 10,000 shares, and
provide for vesting  of the option  over a three-year  period and (ii)  increase
from  30,000  to 60,000  the maximum  number of  shares that  may be  covered by
options granted under the 1993 Plan in any fiscal year. The purpose of the  1993
Plan   is  to  promote  the  interests  of  Protocol  and  its  shareholders  by
strengthening  Protocol's  ability  to   attract  and  retain  experienced   and
knowledgeable  nonemployee  directors  and  to  encourage  them  to  acquire  an
increased proprietary interest in Protocol. The Board believes that the proposed
amendments will  further strengthen  Protocol's ability  to attract  and  retain
experienced  and knowledgeable nonemployee directors. The following is a summary
of the Plan and should be read together with the full text of the Plan.
 
    The 1993 Plan is a formula-based  stock option plan that is administered  by
the  Compensation Committee of the Board  of Directors. Only nonemployee members
of the Board  of Directors  are eligible  to participate  in the  1993 Plan.  In
general,  immediately following the annual meeting of shareholders at which such
director  is  first  elected  to   the  Board  of  Directors  each   nonemployee
 
                                       75
<PAGE>
member  of the Board of  Directors receives an initial  option to purchase 3,000
shares of  Protocol Common  Stock  which is  immediately exercisable  (each,  an
"Initial  Grant"). Under  the proposed  amendments, this  would be  increased to
10,000 shares vesting over  a three-year period.  Thereafter, each director  who
has already received an Initial Grant receives an immediately exercisable option
to  purchase an additional 3,000 shares  of Protocol Common Stock annually after
each annual meeting of shareholders. Each nonemployee director who serves on the
Board of Directors before receiving an  Initial Grant also receives at the  time
of  such director's Initial Grant an option in an amount equal to 250 shares for
each month such  director served on  the Board of  Directors before the  Initial
Grant.
 
    Each  option  expires ten  years  from the  date  of its  grant. Outstanding
options will expire  earlier if  an optionee  terminates service  as a  director
before  the end  of the ten  year term. If  an optionee terminates  service as a
director for any reason  other than retirement, total  disability or death,  the
option will expire automatically on the date of termination. If an optionee dies
or  terminates  service  due  to  retirement  or  disability,  the  options then
outstanding will expire one year  after the date of  death or termination or  on
the  stated  grant  expiration  date,  whichever  is  earlier.  Options  are not
assignable during the lifetime  of the optionee except  by a qualified  domestic
relations order.
 
    The  exercise price of options  granted under the 1993  Plan may not be less
than the fair market value of  a share of Common Stock  on the date of grant  of
the  option. Payment  of the  option exercise price  may be  in cash  or, to the
extent permitted by the Compensation Committee, by delivery of previously  owned
Protocol  stock having a fair market value equal to the option exercise price or
a combination of  cash and  stock. The  Compensation Committee  may also  permit
certain  "cashless" option exercises by allowing optionees to surrender portions
of their options in payment for the stock to be received.
 
    The number of  options which  may be  granted under  the 1993  Plan may  not
exceed  30,000 in any year, subject to  stock splits and similar events. A total
of 340,000 shares of Common Stock have been reserved for issuance upon  exercise
of  stock options  granted under  the 1993 Plan.  Options that  are forfeited or
terminated will again be available for grant. If the amendments to the 1993 Plan
are approved at the Protocol Annual Meeting, options to purchase an aggregate of
26,000 shares of  Common Stock will  be granted to  Protocol's five  nonemployee
directors  immediately after the  Protocol Annual Meeting.  If the amendments to
the 1993  Plan are  not approved  at  the Protocol  Annual Meeting,  options  to
purchase  an aggregate of 12,000 shares of Protocol Common Stock will be granted
to Protocol's five nonemployee directors  immediately after the Protocol  Annual
Meeting.  The closing price of Protocol Common  Stock on the Nasdaq Stock Market
was $24.88 on May 31, 1996.
 
    All options granted under the Plan are non-statutory and are not intended to
qualify under  Section 422  of  the Code.  No gain  will  be recognized  by  the
optionee at the time of a grant. Generally, at exercise, ordinary income will be
recognized  by the  optionee in  an amount equal  to the  difference between the
option exercise price and  the fair market  value of the shares  on the date  of
exercise,  and Protocol will receive a tax deduction for the same amount. At the
time the optionee disposes  of the shares, the  appreciation or depreciation  of
the  shares since the option was exercised will  be treated a either a short- or
long-term capital gain or loss, depending on how long the shares have been held.
 
    The Plan continues in effect until  terminated by the Board of Directors  or
by  shareholders, but such termination will not  affect the terms of any options
outstanding at that time. The Board of Directors may amend, terminate or suspend
the 1993 Plan at any time, provided that no amendment regarding amount, price or
timing of the grants may be made more  than once every six months other than  to
comport  with changes  in certain Securities  Exchange Act  and Internal Revenue
Code requirements.  Amendments  that would  materially  increase the  number  of
shares  that may be issued, materially modify the requirements as to eligibility
for Plan participation, or materially increase the benefits to Plan participants
must be approved by shareholders.
 
    THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE FOR THIS PROPOSAL.  The
proposal  must be approved by the  holders of at least a  majority of the of the
shares of Protocol Common Stock  present in person or  by proxy at the  Protocol
Annual    Meeting.   Abstentions   and   broker   non-votes   are   treated   as
 
                                       76
<PAGE>
"no" votes in determining whether the proposal is approved. The proxies will  be
voted  for or against the proposal, or  as an abstention, in accordance with the
instructions specified on the proxy form. If no instructions are given,  proxies
will be voted for approval of the amendments to the 1993 Plan.
 
          RATIFICATION OF APPOINTMENT OF PROTOCOL INDEPENDENT AUDITORS
 
    The  Board  of Directors  has  appointed KPMG  Peat  Marwick LLP  to  act as
independent auditors for Protocol for the fiscal year ending December 31,  1996,
subject to ratification of such appointment by Protocol's shareholders.
 
    Unless otherwise indicated, properly executed proxies will be voted in favor
of  ratifying the appointment  of KPMG Peat  Marwick LLP to  audit the books and
accounts of Protocol for the fiscal year ending December 31, 1996.
 
    A representative of KPMG Peat Marwick LLP  is expected to be present at  the
Protocol  Annual Meeting and will be given an opportunity to make a statement if
he or she  desires to  do so  and will be  available to  respond to  appropriate
questions.
 
    THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE FOR THIS PROPOSAL.
 
                                       77
<PAGE>
                     DESCRIPTION OF PROTOCOL CAPITAL STOCK
 
    The  authorized capital stock  of Protocol consists  of 30,000,000 shares of
Common Stock, par  value $0.01  per share,  and 10,000,000  shares of  Preferred
Stock,  par  value  $0.01  per  share.  The  following  summary  description  of
Protocol's capital stock does not purport to be complete and is qualified in its
entirety  by  the   provisions  of  Protocol's   Fourth  Restated  Articles   of
Incorporation  and Restated  Bylaws, which  have been  filed as  exhibits to the
Registration Statement, of which this Prospectus is a part.
 
    Protocol's charter  documents provide  for  staggered terms  for  directors,
allow  the removal  of directors  only for cause  and authorize  the issuance of
Preferred Stock without  shareholder approval. These  provisions, together  with
Protocol's  Shareholder Rights Plan, may have the effect of lengthening the time
required for a person to acquire control of Protocol through a proxy contest  or
the election of a majority of the Board of Directors and may deter any potential
unfriendly  offers or  other efforts to  obtain control of  Protocol. This could
deprive Protocol's  shareholders  of  opportunities to  realize  a  premium  for
Protocol's  Common  Stock and  could make  removal  of incumbent  directors more
difficult. At the same  time, these provisions may  have the effect of  inducing
any  persons seeking  control of Protocol  to negotiate terms  acceptable to the
Board of Directors.
 
COMMON STOCK
 
    As  of  May  6,  1996,  7,443,223  shares  of  Protocol  Common  Stock  were
outstanding  and held by  approximately 4,000 shareholders.  Holders of Protocol
Common Stock are entitled to receive such dividends as may from time to time  be
declared  by  Protocol's  Board  of Directors  out  of  funds  legally available
therefor. Holders of Protocol's Common Stock are entitled to one vote per  share
on  all matters on which  shareholders are entitled to vote  and do not have any
cumulative voting rights. Holders of  Protocol Common Stock have no  preemptive,
conversion,  redemption or sinking  fund rights. In the  event of a liquidation,
dissolution or winding  up of  Protocol, holders  of Protocol  Common Stock  are
entitled  to  share equally  and  ratably in  the  assets of  Protocol,  if any,
remaining after the payment of all  of Protocol's debts and liabilities and  the
liquidation  preference of any  outstanding class or  series of Preferred Stock.
The  outstanding  shares   of  Protocol   Common  Stock  are   fully  paid   and
nonassessable.  The rights,  preferences and  privileges of  holders of Protocol
Common Stock are  subject to any  series of Preferred  Stock which Protocol  may
issue in the future as described below.
 
PREFERRED STOCK
 
    Protocol  is authorized to issue up to 10,000,000 shares of Preferred Stock.
The Board of Directors has the authority to issue Preferred Stock in one or more
series and to fix the number of shares constituting any such series, the  voting
powers, designations, preferences and relative, participating, optional or other
special   rights  and  qualifications,   limitations  or  restrictions  thereof,
including the dividend  rights, dividend rate,  terms of redemption,  redemption
price or prices, conversion and voting rights and liquidation preferences of the
shares  constituting  any series,  without  any further  vote  or action  by the
shareholder of  Protocol.  The issuance  of  Preferred  Stock by  the  Board  of
Directors could adversely affect the rights of holders of Protocol Common Stock.
For  example, issuance of Preferred Stock could result in a series of securities
outstanding that  would have  preference  over the  Protocol Common  Stock  with
respect  to  dividends and  in liquidation  and that  could (upon  conversion or
otherwise) enjoy all of the rights appurtenant to the Protocol Common Stock.
 
    The authority possessed by the Board  of Directors to issue Preferred  Stock
could  potentially be used to discourage attempts by others to obtain control of
Protocol  through  merger,  tender  offer,  proxy  or  consent  solicitation  or
otherwise  by making such attempts more difficult to achieve or more costly. The
Board of Directors may  issue Preferred Stock  without shareholder approval  and
with  voting rights that could  adversely affect the voting  power of holders of
Protocol Common Stock. Other than as provided in the Protocol Rights  Agreement,
there  are no agreements or understandings  for the issuance of Preferred Stock,
and the Board of  Directors has no  present intention of  issuing any shares  of
Preferred  Stock.  See "Description  of  Protocol Capital  Stock  -- Shareholder
Rights Plan."
 
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<PAGE>
OREGON CONTROL SHARE AND BUSINESS COMBINATION STATUTES
 
    Protocol is  subject  to  the  Oregon Control  Share  Act  (Oregon  Business
Corporation Act ("OBCA") SectionSection60.801-60.816) (the "Control Share Act").
The  Control Share Act generally provides that a person (the "Acquiring Person")
who acquires  voting stock  of  an Oregon  corporation  in a  transaction  which
results  in such Acquiring Person holding more than 20%, 33% or 50% of the total
voting power of such corporation (a "Control Share Acquisition") cannot vote the
shares it acquires in  the Control Share  Acquisition ("control shares")  unless
voting  rights are accorded to such control  shares by the holders of a majority
of the  outstanding voting  shares, excluding  the control  shares held  by  the
Acquiring  Person  and  shares held  by  the  officers and  inside  directors of
Protocol ("interested  shares"),  and  by  the holders  of  a  majority  of  the
outstanding  voting  shares, including  interested  shares. The  term "Acquiring
Person" is broadly defined to include persons acting as a group.
 
    The Acquiring Person  may, but  is not required  to, submit  to Protocol  an
"Acquiring  Person  Statement"  setting  forth  certain  information  about  the
Acquiring Person and its plans for  acquiring the Protocol stock. The  Statement
may  also  request  that Protocol  call  a  special meeting  of  shareholders to
determine whether the control shares will be allowed to retain voting rights. If
the Acquiring Person  does not request  a special meeting  of shareholders,  the
issue  of voting rights of control shares  will be considered at the next annual
or special meeting of shareholders. If the Acquiring Person's control shares are
accorded voting rights  and represent a  majority or more  of all voting  power,
shareholders  who do not vote in favor  of the restoration of such voting rights
will have the right to receive the appraised "fair value" of their shares, which
may not be less than  the highest price paid per  share by the Acquiring  Person
for the control shares.
 
    Protocol  is  also  subject to  the  Oregon Business  Combination  Act (OBCA
SectionSection60.825-60.845) (the  "Business  Combination  Act").  The  Business
Combination Act generally provides that in the event a person or entity acquires
15%  or  more of  the  voting stock  of  an Oregon  corporation  (an "Interested
Shareholder"), the corporation and the Interested Shareholder, or any affiliated
entity, may not engage in certain business combination transactions for a period
of three years following the date  the person became an Interested  Shareholder.
Business  combination transactions for this purpose include (a) a merger or plan
of share exchange,  (b) any sale,  lease, mortgage or  other disposition of  the
assets  of the corporation where the assets have an aggregate market value equal
to 10% or  more of the  aggregate market  value of the  corporation's assets  or
outstanding  capital  stock  and (c)  certain  transactions that  result  in the
issuance of  capital stock  of the  corporation to  the Interested  Shareholder.
These  restrictions do not apply if (i)  the Interested Shareholder, as a result
of the transaction in which such  person became an Interested Shareholder,  owns
at  least 85% of  the outstanding voting stock  of the corporation (disregarding
shares owned by directors  who are also officers,  and certain employee  benefit
plans),  (ii) the Board of Directors  approves the share acquisition or business
combination before  the  Interested Shareholder  acquires  15% or  more  of  the
corporation's voting stock or (iii) the Board of Directors and the holders of at
least   two-thirds  of   the  outstanding   voting  stock   of  the  corporation
(disregarding  shares  owned   by  the  Interested   Shareholder)  approve   the
transaction  after  the  Interested  Shareholder acquires  15%  or  more  of the
corporation's voting stock.
 
SHAREHOLDER RIGHTS PLAN
 
    In March 1992, the Protocol Board of Directors approved a shareholder rights
plan and declared a dividend of  one preferred share purchase right (a  "Right")
for  each  outstanding  share  of  Common Stock.  The  Board  of  Directors also
authorized the issuance of one Right with respect to each share of Common  Stock
issued  between the record date  of the Rights dividend  (the "Record Date") and
the earliest of the Distribution Date, the Final Expiration Date (as such  terms
are  hereinafter defined) or the date, if any, on which the Rights are redeemed.
Each Right  entitles  the  registered  holder  to  purchase  from  Protocol  one
one-hundredth  of a share of Series  D Junior Participating Preferred Stock, par
value $.01 per share,  of Protocol (the "Preferred  Shares"), at a price  $40.00
per  one one-hundredth of  a Preferred Share (the  "Purchase Price"), subject to
adjustment. The description and terms  of the Rights are  set forth in a  Rights
Agreement  between the  Company and  First Interstate  Bank of  Oregon, N.A., as
Rights Agent, dated March 20, 1992 (the "Rights Agreement").
 
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<PAGE>
    The Rights Agreement  provides that until  the earlier to  occur of (i)  ten
days  following a public  announcement that a  person or group  of affiliated or
associated persons (the "Acquiring Person") has acquired beneficial ownership of
20% or more  of the outstanding  shares of  Protocol Common Stock,  or (ii)  ten
business days (or such later date as may be determined by action of the Protocol
Board  of Directors prior to  such time as any person  or group of affiliated or
associated persons becomes  an Acquiring Person)  following commencement of,  or
announcement  of an  intention to  make, a  tender offer  or exchange  offer the
consummation of which would  result in the beneficial  ownership by a person  or
group  of 20% or more  of such outstanding shares  of Protocol Common Stock (the
earlier of such dates being called the "Distribution Date"), the Rights will  be
evidenced, with respect to any shares of Protocol Common Stock outstanding as of
the Record Date, by the certificate representing such shares of Common Stock.
 
    The  Rights will not  be exercisable until the  Distribution Date. Until the
Distribution Date  (or earlier  redemption  or expiration  of the  Rights),  the
Rights will be transferred with and only with the Protocol Common Stock. As soon
as   practicable  following  the  Distribution   Date,  a  separate  certificate
evidencing the Rights ("Right Certificate") will be mailed to holders of  record
of  the Protocol Common  Stock as of  the close of  business on the Distribution
Date, and such separate Right Certificate alone will evidence the Rights.
 
    In the  event  that Protocol  is  acquired in  a  merger or  other  business
combination  transaction or  50% or more  of its consolidated  assets or earning
power is sold, proper provision will be made so that each holder of a Right will
thereafter have the  right to  receive, upon the  exercise thereof  at the  then
current  exercise price of the  Right, that number of  shares of common stock of
the acquiring company which at the time  of such transaction will have a  market
value of two times the exercise price of the Right. In the event that any person
or group of affiliated or associated persons becomes an Acquiring Person, proper
provision  will  be made  so  that each  holder of  a  Right, other  than Rights
beneficially owned by the Acquiring Person (which will thereafter be void), will
thereafter have the  right to  receive upon exercise  that number  of shares  of
Protocol  Common Stock having a market value  of two times the exercise price of
the Right.
 
    The Rights Agreement  provides that at  any time after  any person or  group
becomes an Acquiring Person and prior to the acquisition by such person or group
of  50% or more of the outstanding shares of Common Stock, the Protocol Board of
Directors may exchange  the Rights (other  than Rights owned  by such person  or
group  which have become void), in whole or in part, at an exchange ratio of one
share of Protocol Common Stock, or  one one-hundredth of a Preferred Share,  per
Right  (subject  to adjustment).  At any  time  prior to  the expiration  of two
business days following notice to Protocol and to the Acquiring Person or  group
of  the acquisition by  such person or  group of beneficial  ownership of 20% or
more of the outstanding shares of Protocol Common Stock (provided that the Board
may extend such two-day period prior to its expiration), the Board of  Directors
would be able to redeem the Rights in whole, but not in part, at a price of $.01
per  Right (the "Redemption  Price"). The redemption  of the Rights  may be made
effective at such time, on such basis  and with such conditions as the Board  of
Directors in its sole discretion establishes. Immediately upon any redemption of
the  Rights, the right to exercise the Rights would terminate and the only right
of the holders of Rights would be to receive the Redemption Price.
 
    The Rights Agreement may  be amended by the  Board of Directors without  the
consent  of the holders of  the Rights, including an  amendment to lower the 20%
threshold described above to not less than 10%, except that from and after  such
time  as any  person or  group of  affiliated or  associated persons  becomes an
Acquiring Person, no such  amendment may adversely affect  the interests of  the
holders of the Rights.
 
    Until  a Right is exercised, the holder thereof, as such, has no rights as a
shareholder of Protocol, including, without limitation, the right to vote or  to
receive dividends. The Rights will expire ten years
 
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<PAGE>
after the date of the Rights Agreement (the "Final Expiration Date"), unless the
Final  Expiration Date is extended or unless  the Rights are earlier redeemed by
the Company, in each case, as described above.
 
TRANSFER AGENT
 
    The transfer  agent  and  registrar  for  Protocol  Common  Stock  is  First
Interstate Bank of Oregon, N.A.
 
                    COMPARATIVE RIGHTS OF PRYON SHAREHOLDERS
                           AND PROTOCOL SHAREHOLDERS
 
    If  the Merger  is consummated,  holders of  Pryon Common  Stock will become
holders of Protocol Common Stock and the rights of the former Pryon shareholders
will be governed by the  OBCA and by the  Articles of Incorporation of  Protocol
(the  "Protocol Articles")  and the Bylaws  of Protocol. The  rights of Protocol
shareholders under  the OBCA  and the  Protocol Articles  and Bylaws  differ  in
certain  limited  respects  from  the rights  of  Pryon  shareholders  under the
Wisconsin  Business  Corporation   Law  (the   "WBCL")  and   the  Articles   of
Incorporation  of Pryon (the  "Pryon Articles") and  Bylaws. Certain differences
between  the  rights  of  Protocol  shareholders  and  Pryon  shareholders   are
summarized below.
 
CLASSES OF STOCK
 
    The  WBCL authorizes a corporation to have one or more classes of stock. All
rights of shares  of a  class must  have preferences,  limitations and  relative
rights  identical with those of other shares of the same class, unless the class
is divided into series.
 
    Pryon's Articles  of Incorporation  provide for  two classes:  Pryon  Common
Stock  and Pryon Preferred Stock. The Pryon  Preferred Stock is divided into two
series: Series A Preferred Stock and Series B Preferred Stock.
 
    The following is a description of the preferences, limitations and  relative
rights of the Pryon Stock.
 
    DIVIDENDS.   Dividends on Pryon Common Stock may be declared as, if and when
declared by the Board.
 
    Pryon Preferred Stock is entitled to participate with the Pryon Common Stock
in any  dividends declared,  with such  participation on  a  "common-equivalent"
basis.  That is, if a dividend on Pryon  Common Stock is declared, each share of
Pryon Series A or Pryon Series B Preferred Stock is entitled to a dividend equal
to the product of (i) the dividend  declared on the Pryon Common Stock and  (ii)
the  number of shares of Pryon Common Stock into which the Pryon Preferred Stock
is then convertible.  Because Pryon  Preferred Stock is  convertible into  Pryon
Common  Stock on a 1:1 basis, the net  effect is that all the Pryon Common Stock
and Pryon Preferred Stock is ratably entitled to the same dividend per share  if
any is declared.
 
    CONVERSION  RIGHTS.   Pryon  Series  A Preferred  Stock  and Pryon  Series B
Preferred Stock are convertible into shares  of Pryon Common Stock based upon  a
formula  at the option of  the holder and, automatically,  upon the closing of a
designated-sized public offering. Application of the conversion formula  results
in  each share of  Pryon Series A  and Series B  Preferred Stock presently being
convertible into one share of Pryon Common Stock.
 
    LIQUIDATION PREFERENCES AND  PARTICIPATION RIGHTS.   Upon the occurrence  of
certain  "Liquidation  Events," which  include  the liquidation,  dissolution or
winding up of Pryon and certain  mergers (including the Merger) involving  Pryon
(unless the holders of 2/3 of the Preferred Stock otherwise decide), the holders
of Pryon Preferred Stock have priority claims on Pryon's assets, as follows:
 
    First,  the holders  of Pryon  Series B  Preferred Stock,  as a  series, are
entitled to receive, prior to  all other classes or  series, an amount equal  to
$61.23 (plus accrued but unpaid dividends) per share
 
                                       81
<PAGE>
("Tier 1 Preference"). Second, the holders of Pryon Series A Preferred Stock, as
a series, are next entitled to receive, prior to all other classes or series, an
amount  equal to $33.24 (plus  accrued but unpaid dividends)  per share ("Tier 2
Preference"). Third, the holders of Pryon Common Stock, as a class, are entitled
to receive  a  priority distribution  of  $2,000,000  (or an  amount  per  share
determined  by dividing $2,000,000 by the number of shares of Pryon Common Stock
at the time  outstanding) ("Tier 3  Preference"). Fourth, if  any assets  remain
after  the Tier  1, Tier  2 and Tier  3 Preferences,  all shares  of Pryon Stock
participate equally in a distribution of  the remaining assets, with each  share
of  Pryon Preferred Stock deemed for this purpose to be equivalent to the number
of shares of Pryon Common Stock into  which it is then convertible (the "Tier  4
Participation  Preference"). However,  subject to the  next paragraph,  if, as a
result of the  Tier 1 Preference  and their  share of the  Tier 4  Participation
Preference,  the holders of Pryon Series B Preferred Stock would receive $122.46
(plus any  accrued but  unpaid dividends)  per  share in  total (the  "Series  B
Initial  Amount"), then the holders  of Pryon Series B  Preferred Stock would no
longer participate  in a  distribution  of the  remaining assets  (although  the
holders of Pryon Common Stock and Pryon Series A Preferred Stock would).
 
    If  the assets available for distribution  were distributed to all shares of
Pryon Stock (with each share  of Preferred Stock deemed  for this purpose to  be
equivalent  to the number of shares of Pryon  Common Stock into which it is then
convertible), and  if  under such  a  distribution  holders of  Pryon  Series  B
Preferred  Stock would  receive the  Series B  Initial Amount,  then all  of the
foregoing preferences  become inapplicable,  and the  assets of  Pryon would  be
distributed to the holders of Pryon Stock pro rata, with each share of Preferred
Stock  deemed for this purpose to be equivalent to the number of shares of Pryon
Common Stock into which it is then convertible. The provisions of this paragraph
will apply if the Protocol Market Value equals or exceeds $12.45 per share.
 
    VOTING RIGHTS.  Each share of Pryon Common Stock is entitled to one vote per
share. Each share of Pryon  Preferred Stock is entitled  to the number of  votes
equal  to the  number of  shares of  Pryon Common  Stock into  which it  is then
convertible.  As  noted,  both  Pryon  Series  A  and  Series  B  are  presently
convertible  into Pryon Common Stock on a one-for-one basis. Except as otherwise
provided, holders of Pryon Common Stock and Pryon Preferred Stock vote  together
as a single voting group.
 
    Pryon's  Articles also provide for special  class voting rights in the event
Pryon proposes to  effect certain actions,  such as altering  the rights of  the
Pryon  Preferred Stock, creating certain new classes or series of stock, certain
reclassifications,  merger   or   consolidation,  certain   sales   of   assets,
liquidation,  payment  of  dividends,  redemption  of  stock  and  changing  the
conversion rights of  Pryon Preferred  Stock. Depending upon  the action,  these
class  voting rights would require either (i) a majority vote of the outstanding
Pryon Series B  Preferred Stock and  a majority  of the sum  of the  outstanding
Pryon Series A Preferred Stock and Pryon Series B Preferred Stock, or (ii) a 2/3
vote  of the sum of the outstanding Pryon Series A and Series B Preferred Stock,
in each case voting as a separate voting group.
 
    In addition,  if  certain "Events  of  Noncompliance" specified  in  Pryon's
Articles  occur, the holders of Pryon Preferred  Stock (acting by a 2/3 vote and
voting as a separate  voting group) have  the right to elect  a majority of  the
corporation's   Board  of  Directors,   who  may  serve   until  such  Event  of
Noncompliance is cured.
 
    REDEMPTION PROVISIONS.  Pryon Common Stock is not subject to any  redemption
provisions.
 
    Pryon Preferred Stock is subject to the following provisions:
 
        (a)  MANDATORY.  On December 31, 1997, Pryon is obliged to redeem all of
    the  Pryon Series A and Series B Preferred  Stock at a price equal to $61.23
    and $33.24 (plus accrued but  unpaid dividends) per share, respectively.  If
    the  assets of the corporation are insufficient, such asset as are available
    will first be distributed to the  holder of Pryon Series B Preferred  Stock,
    then to the holders of Pryon Series A Preferred Stock.
 
       There is no sinking fund.
 
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<PAGE>
        (a)    OPTIONAL.   Pryon  Preferred  Stock  is also  subject  to special
    optional  redemption  provisions.  If  a  "Change  of  Control"  transaction
    specified  in Pryon's Articles  occurs, those holders of  Pryon Series A and
    Series B Preferred Stock  not participating in the  Change of Control  event
    (acting  by the decision of holders of  2/3 of such shares not participating
    in the Change of Control event) may  elect to require Pryon to redeem  their
    Preferred  Stock.  The redemption  price, in  such case,  is the  "Change of
    Control Redemption Price," which generally means the amounts per share which
    the holders of Pryon  Preferred Stock would have  received as a  liquidation
    preference  or participation right if a  Liquidation Event occurred and, if,
    under such provisions, the total assets of Pryon available for  distribution
    were  calculated by multiplying (x) the  price per share paid or transferred
    for the shares of Pryon Common Stock participating in the Change of  Control
    (assuming  the conversion  of all  Pryon Preferred  Stock) by  (y) the total
    number of shares of Pryon Common Stock outstanding at the time of the Change
    of Control (assuming the conversion of all Pryon Preferred Stock).
 
        Furthermore, upon an Event of Noncompliance, upon the request of holders
    of 70% of the Pryon Preferred Stock, the holders thereof may compel Pryon to
    redeem the Pryon Series A Preferred Stock and Pryon Series B Preferred Stock
    at $61.23  and  $33.24  (plus  accrued  but  unpaid  dividends)  per  share,
    respectively.
 
    The  OBCA authorizes  a corporation  to have one  or more  classes of stock.
Protocol's Articles authorize common stock and preferred stock. See "DESCRIPTION
OF PROTOCOL CAPITAL STOCK."
 
AMENDMENTS TO ARTICLES OF INCORPORATION AND BYLAWS
 
    The WBCL  authorizes a  corporation's Board  of Directors  to adopt  certain
amendments  to the  corporation's Articles of  Incorporation without shareholder
action, including, without limitation, deleting  the names and addresses of  the
initial  directors and making  specified changes to  the corporation's name. The
Board of Directors may propose other amendments to the shareholders. Unless  the
WBCL, the corporation's Articles of Incorporation or the Board of Directors as a
condition   to  its  recommendation  to  the  shareholders  requires  a  greater
proportion, the amendment must be approved  by a majority of the votes  entitled
to  be cast  by each  voting group  entitled to  vote thereon,  as well  as by a
majority of the votes entitled  to be cast by any  voting group with respect  to
which the amendment would create dissenters' rights.
 
    The Pryon Articles require separate votes of not less than a majority of the
outstanding  Pryon Series  B Preferred Stock  and a majority  of the outstanding
Pryon Preferred Stock in order to  (i) materially and adversely alter or  change
the  rights, preferences or privileges of the Pryon Preferred Stock, (ii) create
any new class or series of shares  having certain preferences over or on  parity
with  the Pryon  Preferred Stock,  (iii) reclassify  any shares  of Pryon Common
Stock into shares having certain preferences  superior to or on parity with  the
Pryon  Preferred Stock,  or (iv) otherwise  amend the Pryon  Articles or Section
6.04 of Pryon's Bylaws (dealing with restrictions or transfer of stock).
 
    The WBCL authorizes a corporation's Board  of Directors to amend, repeal  or
adopt  new Bylaws, unless (i) the corporation's Articles of Incorporation or the
WBCL  reserves  such  power  exclusively  to  the  shareholders,  or  (ii)   the
shareholders,  in adopting, amending or  repealing a particular bylaw, expressly
provide that the Board of Directors may not amend, repeal or readopt such bylaw.
 
    OBCA  authorizes  a  corporation's  Board  of  Directors  to  adopt  certain
amendments  to the  corporation's Articles of  Incorporation without shareholder
action, including without limitation,  deleting the names  and addresses of  the
initial  directors and making  specified changes to  the corporation's name. The
Board of Directors may propose other amendments to the shareholders. Unless  the
OBCA, the corporation's Articles of Incorporation or the Board of Directors as a
condition   to  its  recommendation  to  the  shareholders  requires  a  greater
proportion, the amendment must be approved  by a majority of the votes  entitled
to  be cast  by each  voting group  entitled to  vote thereon,  as well  as by a
majority of the votes entitled  to be cast by any  voting group with respect  to
which the amendment would create
 
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<PAGE>
dissenters' rights. The Protocol Articles require a vote of not less than 75% of
the  votes  entitled to  be  cast for  the election  of  directors to  amend any
provision of Article V. Article V sets the number of directors, provides for the
classification  of  directors,  and  prescribes  a  means  for  the  removal  of
directors.  The OBCA  authorizes a  corporation's Board  of Directors  to amend,
repeal  or  adopt  new  Bylaws,   unless  (i)  the  corporation's  Articles   of
Incorporation or the OBCA reserve such power exclusively to the shareholders, or
(ii)  the shareholders, in  amending or repealing  a particular bylaw, expressly
provide that the Board of Directors may not amend or repeal such bylaw.
 
SHAREHOLDER POWER TO CALL SPECIAL SHAREHOLDERS' MEETING
 
    The WBCL provides that a special meeting of shareholders may be called by  a
corporation's  Board of Directors, the holders of  at least 10% of all the votes
entitled to be  cast on  any issue  proposed to  be considered  at the  proposed
special meeting, or such other persons as are authorized under the corporation's
Articles  of  Incorporation  or  Bylaws.  The  Bylaws  of  Pryon  authorize  the
President, the Board of Directors or the Chairman of the Board of Directors  (if
the Board designates one) to call a special meeting of shareholders.
 
    The  OBCA provides that a special meeting of shareholders may be called by a
corporation's Board of Directors, the holders of  at least 10% of all the  votes
entitled  to be  cast on  any issue  proposed to  be considered  at the proposed
special meeting, or such other persons as are authorized under the corporation's
Articles of  Incorporation  or Bylaws.  The  Bylaws of  Protocol  authorize  the
President to call a special meeting of shareholders.
 
APPROVAL OF CERTAIN CORPORATE TRANSACTIONS
 
    Under  the WBCL, a merger or share exchange must be recommended by the Board
of Directors to the shareholders, and  the shareholders must approve the  merger
or  share exchange by a  majority of the votes of  each voting group entitled to
vote thereon, unless the  WBCL, the corporation's  Articles of Incorporation  or
the  corporation's Bylaws adopted  under authority granted  by the corporation's
Articles of Incorporation require a  greater proportion. Under Pryon's  Articles
of  Incorporation,  all Pryon  Stock votes  together as  a single  voting group.
Pryon's Articles also require  that a merger or  consolidation of Pryon must  be
approved  by the  vote of  not less  than a  two-thirds vote  of the outstanding
Preferred Stock voting as a separate voting group.
 
    The  WBCL  also  provides  that  a  merger  need  not  be  approved  by  the
shareholders  of the surviving corporation if  (i) the Articles of Incorporation
of the  surviving corporation  will  not differ  after  the merger,  except  for
certain  specified changes, (ii)  no change occurs  in the number, designations,
preferences,  limitations  and   relative  rights  of   shares  held  by   those
shareholders  who  are shareholders  prior to  the merger,  (iii) the  number of
voting shares outstanding immediately after  the merger, plus the voting  shares
issuable  as a result of the merger, will  not exceed by more than 20% the total
number of voting  shares of  the surviving  corporation outstanding  immediately
prior  to the  merger, and (iv)  the number of  participating shares outstanding
immediately after the merger, plus  the number of participating shares  issuable
as  a result of the merger, will not exceed by more than 20% the total number of
participating shares outstanding immediately prior to the merger.  Participating
shares  are  those  shares that  entitle  their holders  to  participate without
limitation in distributions.
 
    The WBCL provides that, in general, a corporation may sell, lease,  exchange
or otherwise dispose of all, or substantially all, of its property or assets, or
dissolve,  if the Board of Directors  recommends the proposed transaction to the
shareholders and the shareholders approve the  transaction by a majority of  the
votes of each voting group entitled to vote thereon, unless a greater proportion
is  specified by the  WBCL, the corporation's Articles  of Incorporation, or the
corporation's Bylaws  adopted  under  authority  granted  by  the  corporation's
Articles of Incorporation. Pryon's Articles of Incorporation require that such a
sale of assets or dissolution must also be approved by the vote of not less than
two-thirds  of the outstanding Pryon Preferred Stock voting as a separate voting
group.
 
    Under the OBCA, a merger or share exchange must be recommended by the  Board
of  Directors to the shareholders, and  the shareholders must approve the merger
or share exchange by a majority of
 
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the votes of each voting  group entitled to vote  thereon, unless the OBCA,  the
corporation's  Articles of  Incorporation or  the Board  of Directors  require a
greater proportion. The Protocol Articles  do not specify a greater  proportion.
The OBCA also provides that a merger need not be approved by the shareholders of
the  surviving corporation if (i) the Articles of Incorporation of the surviving
corporation will  not differ  after  the merger,  except for  certain  specified
changes,  (ii)  no  change  occurs  in  the  number,  designations, preferences,
limitations, and relative rights  of shares held by  those shareholders who  are
shareholders  prior to the merger, (iii) the number of voting shares outstanding
immediately after the merger, plus the voting shares issuable as a result of the
merger, will not exceed by  more than 20% the total  number of voting shares  of
the  surviving corporation outstanding immediately prior to the merger, and (iv)
the number of  participating shares  outstanding immediately  after the  merger,
plus the number of participating shares issuable as a result of the merger, will
not exceed by more than 20% the total number of participating shares outstanding
immediately  prior to  the merger.  Participating shares  are those  shares that
entitle their holders to participate without limitation in distributions.
 
    The OBCA provides that, in general, a corporation may sell, lease,  exchange
or otherwise dispose of all, or substantially all, of its property or assets, or
dissolve,  if the Board of Directors  recommends the proposed transaction to the
shareholders and the shareholders approve the  transaction by a majority of  the
votes of each voting group entitled to vote thereon, unless a greater proportion
is  specified in the corporation's Articles of  Incorporation or by the Board of
Directors. The Protocol Articles do not specify a greater proportion.
 
DISSENTERS' RIGHTS
 
    Under the WBCL,  a shareholder  is entitled to  dissent from  and to  obtain
payment  of  the fair  value of  his shares  in the  event of  certain corporate
actions. The actions which trigger a shareholder's dissenter rights include  (i)
certain  mergers and share exchanges, (ii) certain sales of all or substantially
all of the corporation's assets,  and (iii) other corporate actions  (including,
if the corporation's Articles of Incorporation so provide, certain amendments to
the Articles of Incorporation if such amendment materially and adversely affects
certain  rights of the dissenter's shares)  taken pursuant to a shareholder vote
to  the  extent  the  corporation's  Articles  of  Incorporation,  Bylaws  or  a
resolution  of the Board  of Directors provides that  a shareholder may dissent.
Neither Pryon's Articles of Incorporation or Bylaws, nor any resolutions of  its
Board of Directors, make any such provision.
 
    Under  the OBCA,  a shareholder  is entitled to  dissent from  and to obtain
payment of  the fair  value of  his shares  in the  event of  certain  corporate
actions.  The  actions which  trigger a  shareholder's dissenter  rights include
certain mergers and share exchanges, certain  sales of all or substantially  all
of  the corporation's assets, and an  amendment to the corporation's Articles of
Incorporation that materially and adversely affects the shareholder by  altering
or  abolishing a preemptive right to acquire other securities or by reducing the
number of shares owned by the shareholder to a fraction of a share.
 
    Under the OBCA, dissenters'  rights are not available  to shareholders of  a
corporation  if  the  shares  of  such  corporation  are  listed  on  a national
securities exchange  or quoted  on the  NASDAQ National  Market System.  Because
Protocol's  shares are  quoted on  the NASDAQ  National Market  System, Protocol
shareholders are  not entitled  to dissenters'  rights with  respect to  certain
corporate transactions.
 
ANTI-TAKEOVER PROVISIONS
 
    The WBCL contains several "anti-takeover" provisions.
 
    The  WBCL provides for a "fair price" provision which generally applies only
to issuing public corporations. Under  such provision, restrictions are  imposed
upon  merger and share exchange transactions with, or sales of substantially all
of a corporation's assets to, a 10% shareholder. Such
 
                                       85
<PAGE>
transactions must meet  one of  two requirements:  (i) the  transaction must  be
approved  by a  shareholder vote  of 80% of  all shareholders  and two-thirds of
"disinterested" shareholders (which generally excludes the 10% shareholder);  or
(ii)  the payment of a statutory fair price in a two-step merger, share exchange
or asset sale.
 
    The WBCL restricts business combinations with a 10% shareholder.  Generally,
unless  a  10%  shareholder  received approval  of  the  corporation's  Board of
Directors of either an acquisition of 10% or more of the corporation's shares or
a statutorily-defined  "business combination"  before the  shareholder  acquires
such  10% interest, then (i)  the proposed business combination  is barred for a
period of three years, and (ii)  after three years the business combination  may
proceed  if  it  meets certain  shareholder  voting requirements  or  fair price
standards. The WBCL's business  combination provisions are generally  applicable
only  to corporations  having a class  of voting stock  registered under Section
12(g) of  the  Securities  Exchange Act  of  1934  if the  corporation  has  its
principal  place of business or significant business operations in Wisconsin and
more than 10% of its shares are held by Wisconsin residents.
 
    The WBCL contains a "control share" law. Under the WBCL, subject to  various
exceptions,  the voting rights  of a shareholder  owning in excess  of 20% of an
issuing public corporation's stock are reduced  to one-tenth vote per share  for
the  excess  unless the  full  voting rights  of  such shareholder  are restored
pursuant to a shareholder vote.
 
    The  provisions  of  the  WBCL  relating  to  its  "fair  price,"  "business
combination" and "control share" provisions are not applicable to Pryon.
 
    The  OBCA  contains  an  anti-takeover statute  commonly  referred  to  as a
"control share  law." Oregon's  control share  law provides  that a  person  who
acquires  control shares acquires the voting rights with respect to such control
shares only upon receipt of a majority vote of shares held by the  pre-existing,
disinterested  shareholders  of  the target  corporation.  "Control  shares" are
shares acquired within  a 90  day period  that would,  when added  to all  other
shares held by the acquiring person, cause such person's total voting power (but
for  the  control share  law)  to exceed  any  of three  threshold  levels: 20%,
33 1/3%, or 50% of the total outstanding voting shares. As each threshold  level
is  exceeded a new vote is required.  The provisions of the Oregon control share
law  apply  equally  to   transactions  approved  or   opposed  by  the   target
corporation's Board of Directors.
 
    Upon exceeding any of the statutory thresholds, the acquiring person has the
right to require that the shareholders consider within 50 days of his demand his
right  to vote the control shares (provided that the acquiring person undertakes
to pay the cost  of such shareholders' meeting).  At the shareholders'  meeting,
the  acquiring person may not vote any shares held by him on the issue of voting
rights with respect to the control shares,  and may not vote his control  shares
on  any other  matter brought  before the meeting.  Shares held  by officers and
employee directors of the target corporation are also prohibited from voting  on
the  issue  of  the  acquiring  person's  voting  rights.  The  only significant
exception to the control share law's restriction on voting rights is for  shares
acquired pursuant to a merger.
 
    In  order to be covered by Oregon's control share law, a corporation must be
an Oregon corporation and satisfy certain other tests. Protocol believes that it
currently satisfies such tests and, as a result, is covered by the control share
law.
 
    Both Protocol and Pryon believe that Oregon's control share law could  have,
in  certain circumstances,  a deterrent  effect on  potential takeovers. Because
Oregon's control  share  law effectively  limits  the ability  for  a  potential
acquiror  to  gain  control  of  a  corporation,  it  may  have  the  effect  of
discouraging potential  acquirors  from making  offers  to purchase  the  target
corporation's  shares, which  offers some shareholders  might feel  are in their
best interests.
 
    The OBCA  contains a  statute commonly  known as  the "Business  Combination
Act,"  which provides that in the event a  person or entity acquires 15% or more
of the voting shares of an Oregon corporation (an "Interested Shareholder"), the
corporation and the Interested Shareholder, or any
 
                                       86
<PAGE>
affiliated entity, may not engage  in certain business combination  transactions
for  a period of three years following  the date the person became an Interested
Shareholder. Business combination transactions include, among other things,  (i)
merger  or consolidation with, disposition of assets  to or with, or issuance or
redemption of stock  to or from,  the Acquiring Person,  or (iii) the  Acquiring
Person's  receipt  of  any  disproportionate  benefit  as  a  shareholder. These
restrictions do not apply if (i) the Interested Shareholder, as a result of  the
transaction in which such person became an Interested Shareholder, owns at least
85%  of the  outstanding voting shares  of the  corporation (disregarding shares
owned by directors who are also  officers, and certain employee benefit  plans),
(ii)  the  Board  of  Directors  approves  the  share  acquisition  or  business
combination before  the  Interested Shareholder  acquired  15% or  more  of  the
corporation's  voting shares, or (iii) the Board of Directors and the holders of
a  least  two-thirds  of  the  outstanding  voting  shares  of  the  corporation
(disregarding   shares  owned   by  the  Interested   Shareholder)  approve  the
transaction after  the  Interested  Shareholder  acquires 15%  or  more  of  the
corporation's voting shares.
 
    Both  Protocol and Pryon believe that the Business Combination Act will have
the effect of encouraging  any potential acquiror  to negotiate with  Protocol's
Board  of  Directors  and  will  also  discourage  certain  potential  acquirors
unwilling to comply with its requirements.
 
"BLANK CHECK" PREFERRED STOCK
 
    The Pryon Articles permit  the Board of Directors  to determine the  rights,
preferences,  privileges and  restrictions of authorized  but unissued Preferred
Stock, commonly referred to  as "Blank Check" Preferred  Stock. The issuance  of
Preferred  Stock with extraordinary rights may be used to deter hostile takeover
attempts.
 
    The Protocol Articles permit the Board of Directors to determine the rights,
preferences, privileges and  restrictions of authorized  but unissued  Preferred
Stock,  commonly referred to  as "Blank Check" Preferred  Stock. The issuance of
preferred stock with extraordinary rights may be used to deter hostile  takeover
attempts.
 
REMOVAL OF DIRECTORS
 
    Under  the  WBCL,  shareholders  may  remove  one  or  more  directors  of a
corporation  with  or  without  cause,  unless  the  corporation's  Articles  of
Incorporation  or Bylaws provide  that directors may be  removed only for cause.
The Pryon Articles make no such provision.
 
    Under the  OBCA,  shareholders  may  remove  one  or  more  directors  of  a
corporation  with  or  without  cause,  unless  the  corporation's  Articles  of
Incorporation provide that directors may be removed only for cause. The Protocol
Articles provide that all or any number of the directors may be removed only for
cause, and at a meeting of  the shareholders called expressly for that  purpose,
by  the vote of 75%  of the votes then  entitled to be cast  for the election of
directors.
 
CLASSIFIED BOARD OF DIRECTORS
 
    The  WBCL  permits  the  establishment  in  the  corporation's  Articles  of
Incorporation  or, if the  Articles of Incorporation so  authorize, Bylaws, of a
classified board under  which directors  can be divided  into as  many as  three
classes  having staggered terms of office, with one class of directors coming up
for election each year. The Pryon Articles do not provide for a classified Board
of Directors.
 
    The  OBCA  permits,  if  a  corporation  has  six  or  more  directors,  the
establishment  in the  corporation's Articles  of Incorporation  or Bylaws  of a
classified board under  which directors  can be divided  into as  many as  three
classes  having staggered terms of office, with one class of directors coming up
for election each year. The Protocol Articles and the Bylaws of Protocol provide
for a classified Board of Directors, with three classes and staggered terms.
 
SIZE OF BOARD OF DIRECTORS
 
    Both the WBCA and the OBCA provide that the size of a corporation's Board of
Directors may be specified  in, or fixed in  accordance with, the  corporation's
Articles of Incorporation or Bylaws. The
 
                                       87
<PAGE>
Bylaws  of Pryon provide that  the number of directors may  be set or changed by
the vote of the  Board of Directors or  the shareholders. The Protocol  Articles
and  the Bylaws of Protocol  provide that the number of  directors may be set or
changed by the vote of the Board of Directors or the shareholders.
 
DIVIDENDS AND REPURCHASE OF SHARES
 
    The  WBCL  permits  a  corporation,  unless  otherwise  restricted  by   the
corporation's   Articles  of  Incorporation,  to  make  a  distribution  to  its
shareholders,  unless,  after  giving  effect  to  such  distribution,  (i)  the
corporation  would be unable  to pay its debts  as they became  due in the usual
course of business, or  (ii) the corporation's total  assets would be less  than
the  sum of  its total  liabilities plus,  unless the  corporation's Articles of
Incorporation provide  otherwise,  the  amount  that would  be  needed,  if  the
corporation  were to be  dissolved at the  time of distribution,  to satisfy the
preferential rights upon dissolution  of shareholders whose preferential  rights
are superior to those shareholders receiving the distribution.
 
    The   OBCA  permits  a  corporation,  unless  otherwise  restricted  by  the
corporation's  Articles  of  Incorporation,  to  make  a  distribution  to   its
shareholders,  unless,  after  giving  effect  to  such  distribution,  (i)  the
corporation would be unable  to pay its  debts as they became  due in the  usual
course  of business, or (ii)  the corporation's total assets  would be less than
the sum of  its total  liabilities plus,  unless the  corporation's Articles  of
Incorporation  provide  otherwise,  the  amount that  would  be  needed,  if the
corporation were to  be dissolved at  the time of  distribution, to satisfy  the
preferential  rights upon dissolution of  shareholders whose preferential rights
are superior  to those  shareholders receiving  the distribution.  The  Protocol
Articles   do   not  contain   any   restrictions  regarding   distributions  to
shareholders. In addition,  the OBCA permits  a corporation to  acquire its  own
shares.
 
CLASS VOTING
 
    The  WBCL provides  that the  holders of outstanding  shares of  a class are
entitled to vote as a  separate voting group with  respect to amendments to  the
corporation's  Articles of Incorporation that would affect such class in certain
ways, including, without limitation, changing the aggregate number of authorized
shares of such class, affecting an  exchange or reclassification of all or  part
of  the  shares  of  such  class into  shares  of  another  class,  changing the
designation, rights or preferences of all or  part of the shares of such  class,
or limiting or denying an existing preemptive right of all or part of the shares
of  such class. In addition, the WBCL  requires separate voting by voting groups
with respect to a Plan of Merger  that contains one or more proposed  amendments
to  the Articles of Incorporation, which  amendments would require voting by the
holders of outstanding shares of a class as a separate voting group.
 
    The OBCA provides  that the  holders of outstanding  shares of  a class  are
entitled  to vote as a  separate voting group with  respect to amendments to the
corporation's Articles of Incorporation that would affect such class in  certain
ways,  including without limitation, changing the aggregate number of authorized
shares of such class, affecting an  exchange or reclassification of all or  part
of  the  shares  of  such  class into  shares  of  another  class,  changing the
designation, rights or preferences of all or  part of the shares of such  class,
or limiting or denying an existing preemptive right of all or part of the shares
of  such class. In addition, the OBCA  requires separate voting by voting groups
with respect to a Plan of Merger  that contains one or more proposed  amendments
to  the Articles of Incorporation, which  amendments would require voting by the
holders of outstanding shares of a class as a separate voting group.
 
                                 LEGAL OPINION
 
    The legality of the  Protocol Common Stock to  be issued in connection  with
the  Merger is  being passed  upon for  Protocol by  Ater Wynne  Hewitt Dodson &
Skerritt, LLP, Portland, Oregon.
 
                                       88
<PAGE>
                  DATE FOR SUBMISSION OF SHAREHOLDER PROPOSALS
 
    Any shareholder proposal intended for  inclusion in the proxy statement  and
form of proxy relating to Protocol's 1997 annual meeting of shareholders must be
received  by Protocol  not later  than December 9,  1996, pursuant  to the proxy
soliciting regulations of the Securities and Exchange Commission (the "SEC"). In
addition, Protocol's Bylaws  require that  notice of  shareholder proposals  and
nominations for director be delivered to the Secretary of Protocol not less than
60  days nor more  than 90 days prior  to the date of  an annual meeting, unless
notice or public disclosure of the date of the meeting occurs less than 60  days
prior to the date of such meeting, in which event, shareholders may deliver such
notice not later than the 10th day following the day on which notice of the date
of the meeting was mailed or public disclosure thereof was made. Nothing in this
paragraph  shall be deemed to require Protocol to include in its proxy statement
and form of proxy for such meeting any shareholder proposal which does not  meet
the requirements of the SEC in effect at the time.
 
                                    EXPERTS
 
    The  consolidated financial statements  and consolidated financial statement
schedules of Protocol and its subsidiaries as of December 31, 1995 and 1994  and
for  each  of  the years  in  the three  year  period ended  December  31, 1995,
incorporated by reference in this Joint Proxy Statement/Prospectus have been  so
incorporated  in reliance upon the report  of KPMG Peat Marwick LLP, independent
certified public accountants, and given on the authority of said firm as experts
in auditing and  accounting. The report  of KPMG Peat  Marwick LLP covering  the
December 31, 1995 and 1994 Financial Statements refers to a change in accounting
for  income taxes to adopt the  provisions of the Financial Accounting Standards
Board's Statement of Financial  Accounting Standards (SFAS) No.109,  "Accounting
for  Income  Taxes"  and  a  change in  the  method  of  accounting  for certain
investments in  debt  and equity  securities  to  adopt the  provisions  of  the
Financial   Accounting  Standards  Board's  Statement  of  Financial  Accounting
Standards (SFAS) No. 115, "Accounting for Certain Investments in Debt and Equity
Securities."
 
    The financial statements of Pryon as of December 31, 1995 and 1994, and  for
each  of the three years in the period ended December 31, 1995, included in this
Joint Proxy  Statement/Prospectus have  been so  included in  reliance upon  the
report  of  Price  Waterhouse LLP,  independent  accountants, and  given  on the
authority of said firm as experts in auditing and accounting.
 
                                       89
<PAGE>
                        PRYON CORPORATION AND SUBSIDIARY
 
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                                          PAGE
                                                                                                      ------------
<S>                                                                                                   <C>
Report of Independent Accountants...................................................................      F-1
Consolidated Financial Statements:
  Consolidated Balance Sheets.......................................................................      F-2
  Consolidated Statements of Operations.............................................................      F-3
  Consolidated Statements of Shareholders' (Deficit) Equity.........................................      F-4
  Consolidated Statements of Cash Flows.............................................................      F-5
  Notes to Consolidated Financial Statements........................................................   F-6 - F-11
</TABLE>
 
<PAGE>
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Board of Directors of
Pryon Corporation
 
    In our opinion, the accompanying consolidated balance sheets and the related
consolidated  statements of operations and shareholders' (deficit) equity and of
cash flows present fairly, in all  material respects, the financial position  of
Pryon  Corporation and  its subsidiary  at December 31,  1995 and  1994, and the
results of their operations and their cash flows for each of the three years  in
the  period  ended  December 31,  1995,  in conformity  with  generally accepted
accounting principles. These financial statements are the responsibility of  the
Company's  management;  our responsibility  is to  express  an opinion  on these
financial statements  based on  our audits.  We conducted  our audits  of  these
statements  in  accordance  with  generally  accepted  auditing  standards which
require that we plan and perform the audit to obtain reasonable assurance  about
whether  the financial  statements are free  of material  misstatement. An audit
includes examining,  on  a  test  basis, evidence  supporting  the  amounts  and
disclosures  in the  financial statements,  assessing the  accounting principles
used and significant estimates  made by management,  and evaluating the  overall
financial   statement  presentation.  We  believe  that  our  audits  provide  a
reasonable basis for the opinion expressed above.
 
PRICE WATERHOUSE LLP
 
Milwaukee, Wisconsin
March 11, 1996
 
                                      F-1
<PAGE>
                        PRYON CORPORATION AND SUBSIDIARY
 
                          CONSOLIDATED BALANCE SHEETS
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                                                DECEMBER 31,
                                                                                        ----------------------------
                                                                                            1995           1994
                                                                           MARCH 31,    -------------  -------------
                                                                         -------------
                                                                             1996
                                                                         -------------
                                                                          (UNAUDITED)
<S>                                                                      <C>            <C>            <C>
CURRENT ASSETS
  Cash and cash equivalents............................................  $      10,064  $      45,230  $     166,640
  Accounts receivable, less allowance for doubtful accounts of $52,000,
   $52,000 and $40,000 in 1996, 1995 and 1994, respectively............      1,777,536      1,613,282      1,352,823
  Inventories..........................................................      3,844,325      3,769,428      3,252,710
  Other current assets.................................................        221,179        196,558         57,766
                                                                         -------------  -------------  -------------
    Total current assets...............................................      5,853,104      5,624,498      4,829,939
                                                                         -------------  -------------  -------------
PROPERTY AND EQUIPMENT
  Machinery and equipment..............................................      2,112,410      1,777,310      1,457,829
  Office furniture and equipment.......................................        942,986        889,886        629,822
  Leasehold improvements...............................................        403,601        392,092        365,855
  Construction in progress.............................................       --              273,856       --
                                                                         -------------  -------------  -------------
                                                                             3,458,997      3,333,144      2,453,506
  Less: accumulated depreciation.......................................     (1,696,077)    (1,512,651)      (942,262)
                                                                         -------------  -------------  -------------
                                                                             1,762,920      1,820,493      1,511,244
                                                                         -------------  -------------  -------------
OTHER ASSETS
  Capitalized software development costs -- net........................        251,397        255,397        196,001
  Other................................................................       --                9,493         75,079
                                                                         -------------  -------------  -------------
                                                                               251,397        264,890        271,080
                                                                         -------------  -------------  -------------
                                                                         $   7,867,421  $   7,709,881  $   6,612,263
                                                                         -------------  -------------  -------------
                                                                         -------------  -------------  -------------
                           LIABILITIES AND SHAREHOLDERS' (DEFICIT) EQUITY
CURRENT LIABILITIES
  Line of credit.......................................................  $    --        $    --        $   1,150,000
  Notes payable -- Shareholders........................................                      --              226,287
  Current maturities of long-term debt.................................         50,000         50,000         57,000
  Current maturities of capital lease obligation.......................         37,851         49,816         44,816
  Accounts payable.....................................................        824,161        776,544        946,638
  Accrued compensation and employee benefits...........................         33,660        358,008        115,043
  Accrued warranties...................................................        155,081        145,081        145,475
  Other current liabilities............................................        126,067         69,337        122,917
                                                                         -------------  -------------  -------------
    Total current liabilities..........................................      1,226,820      1,448,786      2,808,176
                                                                         -------------  -------------  -------------
LONG-TERM DEBT
  Line of credit.......................................................      1,571,038      1,381,035       --
  Notes payable -- Shareholders........................................        226,287        226,287       --
  Notes payable -- Bank................................................        175,000        187,500        106,652
  Capital lease obligation.............................................       --             --               49,816
                                                                         -------------  -------------  -------------
                                                                             1,972,325      1,794,822        156,468
                                                                         -------------  -------------  -------------
SERIES A REDEEMABLE PREFERRED STOCK, $.10 stated value; 60,000 shares
 authorized, 58,505 shares issued and outstanding......................      1,887,998      1,887,998      1,887,998
                                                                         -------------  -------------  -------------
SERIES B REDEEMABLE PREFERRED STOCK, $.10 stated value; 80,599 shares
 authorized, issued and outstanding....................................      4,848,514      4,848,514      4,848,514
                                                                         -------------  -------------  -------------
SHAREHOLDERS' (DEFICIT) EQUITY
  Common stock, $.10 par value; 419,401 shares authorized, 101,920,
   101,920 and 101,880 shares issued and outstanding at March 31, 1996,
   December 31, 1995 and 1994, respectively............................         10,192         10,192         10,188
  Additional paid-in capital...........................................            918            918            722
  Accumulated deficit..................................................     (1,571,743)    (1,773,746)    (2,592,200)
                                                                         -------------  -------------  -------------
                                                                            (1,560,633)    (1,762,636)    (2,581,290)
                                                                         -------------  -------------  -------------
  Less -- Treasury stock, 26,512 shares at cost........................       (507,603)      (507,603)      (507,603)
                                                                         -------------  -------------  -------------
                                                                            (2,068,236)    (2,270,239)    (3,088,893)
                                                                         -------------  -------------  -------------
                                                                         $   7,867,421  $   7,709,881  $   6,612,263
                                                                         -------------  -------------  -------------
                                                                         -------------  -------------  -------------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements.
 
                                      F-2
<PAGE>
                        PRYON CORPORATION AND SUBSIDIARY
                     CONSOLIDATED STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                    FOR THE YEAR ENDED                FOR THE THREE MONTHS ENDED
                                                       DECEMBER 31,                           MARCH 31,
                                       --------------------------------------------  ----------------------------
                                            1995           1994           1993           1996           1995
                                       --------------  -------------  -------------  -------------  -------------
                                                                                             (UNAUDITED)
<S>                                    <C>             <C>            <C>            <C>            <C>
NET SALES............................  $   12,276,320  $   7,892,059  $   7,203,276  $   3,135,084  $   3,058,643
OTHER REVENUES.......................        --              108,880         37,000       --             --
                                       --------------  -------------  -------------  -------------  -------------
                                           12,276,320      8,000,939      7,240,276      3,135,084      3,058,643
COST OF GOODS SOLD...................       7,242,545      5,435,324      5,213,142      1,754,838      1,790,728
                                       --------------  -------------  -------------  -------------  -------------
GROSS PROFIT.........................       5,033,775      2,565,615      2,027,134      1,380,246      1,267,915
OPERATING EXPENSES:
  Research and development...........       1,528,823      1,352,831      1,139,776        459,489        369,348
  General and administrative.........       1,240,060      1,009,158        850,916        343,974        260,884
  Marketing and selling..............       1,252,315        846,846        265,627        321,946        267,177
                                       --------------  -------------  -------------  -------------  -------------
                                            4,021,198      3,208,835      2,256,319      1,125,409        897,409
                                       --------------  -------------  -------------  -------------  -------------
INCOME (LOSS) FROM OPERATIONS........       1,012,577       (643,220)      (229,185)       254,837        370,506
OTHER INCOME (EXPENSE):
  Interest income....................           5,010          5,236         16,529          2,060          1,259
  Interest expense...................        (185,380)      (146,071)       (50,927)       (49,927)       (42,599)
  Other..............................         (13,753)        (9,880)          (230)        (4,967)         8,499
                                       --------------  -------------  -------------  -------------  -------------
                                             (194,123)      (150,715)       (34,628)       (52,834)       (32,841)
                                       --------------  -------------  -------------  -------------  -------------
INCOME (LOSS) BEFORE INCOME TAXES....         818,454       (793,935)      (263,813)       202,003        337,665
PROVISION FOR INCOME TAXES...........        --             --             --             --             --
                                       --------------  -------------  -------------  -------------  -------------
NET INCOME (LOSS)....................  $      818,454  $    (793,935) $    (263,813) $     202,003  $     337,665
                                       --------------  -------------  -------------  -------------  -------------
                                       --------------  -------------  -------------  -------------  -------------
NET INCOME (LOSS) PER SHARE..........  $         3.65  $      (10.55) $       (3.51) $         .89  $        1.49
                                       --------------  -------------  -------------  -------------  -------------
                                       --------------  -------------  -------------  -------------  -------------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements.
 
                                      F-3
<PAGE>
                        PRYON CORPORATION AND SUBSIDIARY
           CONSOLIDATED STATEMENTS OF SHAREHOLDERS' (DEFICIT) EQUITY
 
<TABLE>
<CAPTION>
                                              COMMON STOCK          TREASURY STOCK       ADDITIONAL
                                          --------------------  ----------------------     PAID-IN     ACCUMULATED
                                           SHARES     AMOUNT     SHARES      AMOUNT        CAPITAL       DEFICIT        TOTAL
                                          ---------  ---------  ---------  -----------  -------------  ------------  ------------
<S>                                       <C>        <C>        <C>        <C>          <C>            <C>           <C>
Balance at December 31, 1992............    101,500  $  10,150    (26,512) $  (507,603)   $      --    $ (1,534,452) $ (2,031,905)
  Net (loss)............................     --         --         --          --            --            (263,813)     (263,813)
  Issuance of common stock..............        200         20     --          --               380         --                400
                                          ---------  ---------  ---------  -----------        -----    ------------  ------------
Balance at December 31, 1993............    101,700     10,170    (26,512)    (507,603)         380      (1,798,265)   (2,295,318)
  Net (loss)............................     --         --         --          --            --            (793,935)     (793,935)
  Issuance of common stock..............        180         18     --          --               342         --                360
                                          ---------  ---------  ---------  -----------        -----    ------------  ------------
Balance at December 31, 1994............    101,880     10,188    (26,512)    (507,603)         722      (2,592,200)   (3,088,893)
  Net income............................     --         --         --          --            --             818,454       818,454
  Issuance of common stock..............         40          4     --          --               196         --                200
                                          ---------  ---------  ---------  -----------        -----    ------------  ------------
Balance at December 31, 1995............    101,920     10,192    (26,512)    (507,603)         918      (1,773,746)   (2,270,239)
  Net income............................     --         --         --          --            --             202,003       202,003
                                          ---------  ---------  ---------  -----------        -----    ------------  ------------
Balance at March 31, 1996 (Unaudited)...    101,920  $  10,192    (26,512) $  (507,603)   $     918    $ (1,571,743) $ (2,068,236)
                                          ---------  ---------  ---------  -----------        -----    ------------  ------------
                                          ---------  ---------  ---------  -----------        -----    ------------  ------------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements.
 
                                      F-4
<PAGE>
                        PRYON CORPORATION AND SUBSIDIARY
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                       FOR THE YEAR ENDED                 FOR THE THREE MONTHS
                                                          DECEMBER 31,                      ENDED MARCH 31,
                                           -------------------------------------------  ------------------------
                                               1995           1994           1993          1996         1995
                                           -------------  -------------  -------------  -----------  -----------
                                                                                              (UNAUDITED)
<S>                                        <C>            <C>            <C>            <C>          <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net income (loss)......................  $     818,454  $    (793,935) $    (263,813) $   202,003  $   337,665
  Adjustments to reconcile net income
   (loss) to net cash provided by (used
   for) operating activities:
    Depreciation and amortization........        642,389        478,366        328,979      187,426      152,780
    (Decrease) increase in cash due to
     changes in:
      Accounts receivable................       (260,459)      (367,600)        78,173     (164,254)    (325,790)
      Inventory..........................       (516,718)      (651,213)      (625,669)     (74,897)      14,993
      Other current assets...............        (73,301)       (25,553)       129,318      (24,621)     (31,810)
      Other assets.......................             95           (132)       (74,947)       9,493      --
      Accounts payable...................       (170,094)       434,750         (1,693)      47,617     (121,624)
      Deferred revenue...................       --             (183,150)      (758,350)     --           --
      Other current liabilities..........        188,992         97,064        113,263     (257,618)     (81,882)
                                           -------------  -------------  -------------  -----------  -----------
Net cash provided by (used for) operating
 activities..............................        629,358     (1,011,403)    (1,074,739)     (74,851)     (55,668)
                                           -------------  -------------  -------------  -----------  -----------
CASH FLOWS FROM INVESTMENT ACTIVITIES:
  Additions to property and equipment....       (879,638)      (567,106)      (804,172)    (125,853)    (185,967)
  Additions to capitalized software
   development costs.....................       (131,397)      (100,000)       (96,000)     --           --
                                           -------------  -------------  -------------  -----------  -----------
Net cash used for investing activities...     (1,011,035)      (667,106)      (900,172)    (125,853)    (185,967)
                                           -------------  -------------  -------------  -----------  -----------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Issuance of Series B redeemable
   preferred stock -- net................       --              995,902         10,042      --           --
  Issuance of common stock...............            200            360            400      --               200
  Capital lease obligation...............        (44,816)      --             --            (11,965)     (10,764)
  Net proceeds (payments) of notes
   payable...............................         73,848        (94,261)        83,329      (12,500)     (13,448)
  Proceeds from line of credit...........        231,035        800,000        350,000      190,003      200,000
                                           -------------  -------------  -------------  -----------  -----------
Net cash provided by financing
 activities..............................        260,267      1,702,001        443,771      165,538      175,988
                                           -------------  -------------  -------------  -----------  -----------
NET (DECREASE) INCREASE IN CASH AND CASH
 EQUIVALENTS.............................       (121,410)        23,492     (1,531,140)     (35,166)     (65,647)
CASH AND CASH EQUIVALENTS, BEGINNING OF
 PERIOD..................................        166,640        143,148      1,674,288       45,230      166,640
                                           -------------  -------------  -------------  -----------  -----------
END OF PERIOD............................  $      45,230  $     166,640  $     143,148  $    10,064  $   100,993
                                           -------------  -------------  -------------  -----------  -----------
                                           -------------  -------------  -------------  -----------  -----------
SUPPLEMENTAL DISCLOSURE
  Cash paid during the period:
    Interest.............................  $     178,827  $     135,009  $      51,267  $    51,716  $    52,334
                                           -------------  -------------  -------------  -----------  -----------
                                           -------------  -------------  -------------  -----------  -----------
NON-CASH TRANSACTIONS
  Equipment capitalized under capital
   leases................................  $    --        $     134,951  $    --        $   --       $   --
                                           -------------  -------------  -------------  -----------  -----------
                                           -------------  -------------  -------------  -----------  -----------
</TABLE>
 
    The accompanying notes are an integral part of the financial statements.
 
                                      F-5
<PAGE>
                        PRYON CORPORATION AND SUBSIDIARY
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
NOTE 1 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
    NATURE  OF BUSINESS   --  Pryon  Corporation (the "Company")  is a Wisconsin
corporation located in Menomonee  Falls, Wisconsin. The  Company was founded  in
1988  and  is engaged  in the  design,  manufacture and  sale of  carbon dioxide
monitoring devices for  medical applications. Distribution  of these devices  is
made  on a world-wide basis through  original equipment manufacturers and direct
distribution channels.  International sales  totalled $1,701,000,  $951,000  and
$929,000 for the years ended December 31, 1995, 1994 and 1993, respectively.
 
    QUARTERLY  INFORMATION  --   The financial statements at  March 31, 1996 and
for the  three  month periods  ended  March 31,  1996  and 1995  are  unaudited,
however,  in the  opinion of management,  all adjustments,  consisting solely of
normal recurring adjustments, necessary for a fair presentation of the financial
position at these dates and the results  of operations and cash flows for  these
periods  have been included. The results for  the three month period ended March
31, 1996 are not necessarily indicative of the results that may be expected  for
the full year or any other interim period.
 
    PRINCIPLES  OF  CONSOLIDATION   --   The  consolidated  financial statements
include the  accounts of  the  Company and  its wholly-owned  subsidiary,  Pryon
World-Wide  Corporation, a foreign sales  corporation, which was incorporated in
July 1993. All intercompany transactions and balances have been eliminated.
 
    CASH AND CASH EQUIVALENTS   --  Cash equivalents  are stated at cost,  which
approximates  market. The Company  considers all highly  liquid debt instruments
with a maturity  of three  months or less  at the  date of purchase  to be  cash
equivalents.   At  December  31,  1995  and  1994,  money  market  mutual  funds
approximating $500 and $10,200, respectively, are included as cash equivalents.
 
    INVENTORIES  --  Inventories are valued at the lower of cost, determined  by
the first-in, first-out method or market.
 
    PROPERTY  AND  EQUIPMENT   --   Property  and equipment  is stated  at cost.
Properties  are  depreciated  using  the  straight-line  method  for   financial
reporting  purposes and accelerated methods  for income tax purposes. Properties
are depreciated over their estimated useful lives which range from three to five
years for  machinery,  equipment  and  office furniture  and  eleven  years  for
leasehold  improvements.  Expenditures  which  substantially  increase  value or
extend useful lives  are capitalized. Expenditures  for maintenance and  repairs
are  charged against income as incurred. Depreciation expense totalled $570,388,
$418,866 and $254,443  for the  years ended December  31, 1995,  1994 and  1993,
respectively.
 
    RESEARCH  AND DEVELOPMENT  --   Research and development costs are primarily
expensed as  incurred.  Development  costs  related  to  software  used  in  the
Company's  products are charged to research and development expense as incurred.
Subsequent software development costs incurred  to develop a product master  are
capitalized.  Costs totalling $131,000 and $100,000 were capitalized during 1995
and 1994,  respectively.  Amortization of  these  costs is  computed  using  the
straight-line  method over the estimated period  of benefit. The Company reviews
the carrying value of these costs  for impairment whenever events or changes  in
circumstances indicate that the carrying amount may not be recoverable.
 
    DEFERRED  AND  OTHER REVENUES    --   The  Company often  receives one-time,
non-refundable  fees  for  engineering  services  and  advanced  payments   from
customers  under sales agreements. The fees for engineering charges are deferred
and recognized ratably as income over  the period that the engineering  services
are  performed. Income recognized from engineering  services for the years ended
December 31,  1994  and  1993  has  been  included  as  other  revenues  on  the
accompanying statements of operations ($0 in 1995). Advanced payments for future
delivery of products are deferred
 
                                      F-6
<PAGE>
                        PRYON CORPORATION AND SUBSIDIARY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
NOTE 1 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
and  recognized as sales in  accordance with actual delivery  terms of the sales
agreements. In all other  cases, the Company recognizes  revenue at the time  of
shipment  of products. Additionally, the  Company provides for estimated product
warranty costs and returns at the time of shipment.
 
    INCOME TAXES  --  Deferred tax assets and liabilities are recognized for the
expected future tax consequences of temporary differences between the  financial
reporting  and tax  bases of  assets and  liabilities. A  valuation allowance is
recorded against all deferred tax assets, including net operating loss and other
tax basis  carryforwards, for  the  amount which  management considers  it  will
likely not realize.
 
    EARNINGS  PER SHARE  --  Earnings  per share amounts are computed based upon
the weighted average number of shares actually outstanding plus the shares  that
would  be  outstanding  assuming  exercise of  dilutive  stock  options  and the
conversion of the Series A and  Series B redeemable preferred stock. The  number
of  common  and common  stock  equivalent shares  used  in the  computation were
227,045 and 226,645 for the periods ended March 31, 1996 and 1995, respectively,
and 224,520, 75,278 and 75,088 for the  years ended December 31, 1995, 1994  and
1993,  respectively.  Dilutive  stock options  and  the  Series A  and  Series B
redeemable preferred stock were  antidilutive for the  years ended December  31,
1994 and 1993.
 
    USE  OF ESTIMATES  --  The preparation of financial statements in conformity
with generally  accepted  accounting  principles  requires  management  to  make
estimates  and  assumptions  that  affect the  reported  amounts  of  assets and
liabilities and disclosure of contingent assets  and liabilities at the date  of
the  financial statements,  and the  reported amounts  of revenues  and expenses
during the reporting period. Actual results could differ from those estimates.
 
NOTE 2 -- INVENTORIES
    Inventories consist of the following:
 
<TABLE>
<CAPTION>
                                                               MARCH 31,            DECEMBER 31,
                                                             -------------  ----------------------------
                                                                 1996           1995           1994
                                                             -------------  -------------  -------------
<S>                                                          <C>            <C>            <C>
                                                              (UNAUDITED)
Raw materials..............................................  $   1,250,260  $   1,324,411  $   1,121,012
Work in process............................................      2,206,378      2,184,903      2,000,809
Finished goods.............................................        387,687        260,114        130,889
                                                             -------------  -------------  -------------
                                                             $   3,844,325  $   3,769,428  $   3,252,710
                                                             -------------  -------------  -------------
                                                             -------------  -------------  -------------
</TABLE>
 
NOTE 3 -- LINE OF CREDIT
    During 1995 the Company  entered into a $2,250,000  line of credit and  term
notes  agreement  with a  bank. Available  borrowings under  the line  of credit
agreement are  limited  by  certain  calculations that  are  based  on  eligible
accounts  receivable and  inventories of the  Company. The line  of credit bears
interest at the  bank's prime  rate plus  1% (9.5%  at December  31, 1995).  The
interest  rate  on the  line  of credit  may be  reduced  by .25%  subsequent to
December 31, 1995,  provided the Company  attains certain financial  milestones.
The  line of credit  is due in 1998  and is secured by  substantially all of the
assets of  the  Company. Borrowings  outstanding  on  the line  of  credit  were
$1,381,000  at December 31,  1995. The line  of credit and  term notes agreement
contains certain financial covenants and other restrictions.
 
    In 1994 the  Company maintained a  $2,000,000 line of  credit and term  note
agreement  with a bank. Available borrowings  under the line of credit agreement
were limited  by certain  calculations that  were based  on the  assets and  net
income of the Company. The line of credit bore interest at the bank's prime rate
plus  .5%  (9.0%  at December  31,  1994) and  required  the Company  to  pay an
additional annual facility fee of $10,000. The line of credit was due on  demand
and  was secured by substantially  all of the assets  of the Company. Borrowings
outstanding on the  line of  credit and  term note  agreement contained  certain
restrictions   and   requirements  with   regard   to  significant   changes  in
 
                                      F-7
<PAGE>
                        PRYON CORPORATION AND SUBSIDIARY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
NOTE 3 -- LINE OF CREDIT (CONTINUED)
ownership or management of the Company and dividend distributions without  prior
bank approval. In addition, the Company was required to maintain certain minimum
net  worth levels. In 1995, the Company repaid the amount outstanding under this
agreement.
 
NOTE 4 -- LONG-TERM DEBT
    During 1995 the Company entered into a  $250,000 term note with a bank.  The
note  bears interest at the bank's prime  rate plus 1.25% (9.75% at December 31,
1995) and is secured by substantially all of the assets of the Company. The note
is for  a  four year  term,  with monthly  payments  of principal  and  interest
commencing  October 31, 1995.  The monthly principal  payments total $4,167 with
the remaining unpaid balance due on July 31, 1998. Borrowings outstanding  under
the term note were $237,500 at December 31, 1995.
 
    During  1995 the Company  entered into a  $250,000 term note  with a bank to
finance capital expenditures. The Company may take advances against the note for
80% of capital expenditures  approved by the bank.  Borrowings against the  note
bear  interest at the bank's prime rate  plus 1.25% (9.75% at December 31, 1995)
and are secured by substantially all of the assets of the Company. Advances  are
to be repaid in equal monthly installments over a four year period commencing on
the  month subsequent to the  advance, with the remaining  unpaid balance due on
July 31, 1998. No advances were outstanding under the term note at December  31,
1995.
 
    In  1994 the  Company had a  $240,000 term note  with a bank.  The note bore
interest at the bank's prime  rate plus 1% (9.5% at  December 31, 1994) and  was
secured  by substantially all of  the assets of the Company.  The note was for a
four year term, with monthly payments  of principal and interest due  commencing
July  31, 1993 in the  amount of $5,800 and the  remaining unpaid balance due on
June 30,  1997. Borrowings  outstanding under  the term  note were  $163,652  at
December 31, 1994. In 1995, the Company repaid the amounts outstanding under the
term note.
 
    In  August 1990, in accordance with the Stock Purchase Agreement relating to
the issuance  of the  Series A  redeemable  preferred stock  (see Note  5),  the
Company issued $226,287 of notes payable to certain officers and shareholders of
the  Company. On July 2, 1995, the  existing notes payable were canceled and new
notes were  issued which  extended the  maturity date  of the  unpaid  principal
balance to June 30, 1997 and modified the quarterly prepayment formula. Interest
on  the outstanding balance is payable monthly and is computed based on a bank's
prime rate, plus 2%  (10.5% at December  31, 1995). The  Company is required  to
make  quarterly prepayments of  principal based on a  formula which is dependent
upon the Company's reported quarterly earnings. No payments have been made as of
December 31, 1995  by the Company.  The notes  are subordinated to  the line  of
credit  and term  notes with a  bank. Accordingly, all  quarterly prepayments of
principal are subject to prior approval of the bank.
 
    The  Company  leases  certain  computer  equipment  under  a  capital  lease
agreement. See Note 6.
 
    Future obligations under long-term debt agreements in effect at December 31,
1995 are as follows:
 
<TABLE>
<S>                                                      <C>
1996...................................................  $   50,000
1997...................................................     276,287
1998...................................................   1,518,535
                                                         ----------
                                                         $1,844,822
                                                         ----------
                                                         ----------
</TABLE>
 
NOTE 5 -- SERIES A AND SERIES B REDEEMABLE PREFERRED STOCK
    The  Company  has authorized  60,000 shares  of $.10  stated value  Series A
redeemable preferred  stock. At  December 31,  1995, 1994  and 1993  there  were
58,505 shares of Series A redeemable preferred stock outstanding.
 
                                      F-8
<PAGE>
                        PRYON CORPORATION AND SUBSIDIARY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
NOTE 5 -- SERIES A AND SERIES B REDEEMABLE PREFERRED STOCK (CONTINUED)
    At  December 31, 1995, 1994  and 1993, there were  80,599, 80,599 and 64,267
shares of  $.10 stated  value Series  B redeemable  preferred stock  authorized,
respectively, and 80,599, 80,599 and 64,104 shares outstanding, respectively. In
December 1994, the Company issued 16,495 of these shares. In connection with the
1994  issuance, the  Company incurred  $14,087 of  legal fees  which were offset
against the related  proceeds of the  issuance. During March  1993, the  Company
issued 164 shares of Series B redeemable preferred stock. The issuance price for
each of these transactions was $61.23 per share.
 
    Each  share  of  Series  A  and  Series  B  redeemable  preferred  stock  is
convertible, at any time, into the number of shares of common stock based upon a
conversion ratio, as defined  in the Stock  Purchase Agreements. The  Conversion
Price  is  equal to  the initial  issuance  price for  each share  of redeemable
preferred stock. The Conversion Price is subject to adjustment upon the issuance
of common  stock or  other  convertible securities.  Based upon  the  Conversion
Price,  at December  31, 1995 the  holders of  Series A and  Series B redeemable
preferred stock may convert  their shares into 139,104  shares of common  stock.
The preferred shareholders are entitled to one vote per common share which would
be  issuable upon conversion of the  preferred stock. The preferred shareholders
are entitled  to  participate  with the  holders  of  the common  stock  in  any
dividends  declared, paid or  accrued. The Series  B redeemable preferred shares
have priority over Series  A redeemable preferred shares  and common stock  upon
liquidation  of the Company.  In addition, Series  A redeemable preferred shares
have priority over common stock upon liquidation.
 
    The Company is required to redeem all of the shares of Series A and Series B
redeemable preferred shares on December 31, 1997. The redemption price shall  be
an  amount equal to the original issuance  price per share plus any declared but
unpaid dividends.  If the  assets of  the Company  are insufficient  to pay  the
holders of the preferred shares the full amounts to which they shall be entitled
at  the  date of  redemption, funds  to  the extent  legally available  shall be
distributed according to the liquidation preference of the preferred shares. The
Series A  and  Series B  redeemable  preferred shares  require  compliance  with
certain  nonfinancial covenants  concerning continuity  of operations, corporate
existence and management and certain other  items. If an event of  noncompliance
has  occurred and is continuing, the Company  shall, upon the written request of
70% of the preferred shareholders, redeem the preferred shares then  outstanding
at the original issuance price.
 
NOTE 6 -- LEASES
    The  Company has  secured agreements for  $750,000 of  operating leases with
certain leasing companies  to provide  for capital  equipment requirements.  The
various lease terms of the agreements expire in January 1996 through July 1997.
 
    The  Company  leases  certain  computer  equipment  under  a  capital  lease
agreement. Equipment  under  capital  leases  are  included  within  the  office
furniture and equipment caption in the accompanying balance sheets.
 
    Future minimum lease payments required under long-term operating and capital
lease agreements in effect at December 31, 1995 are as follows:
 
<TABLE>
<CAPTION>
                                                                     CAPITAL    OPERATING      TOTAL
                                                                    ---------  -----------  -----------
<S>                                                                 <C>        <C>          <C>
1996..............................................................  $  52,728  $   231,090  $   283,818
1997..............................................................     --          121,614      121,614
1998..............................................................     --            6,392        6,392
1999..............................................................     --            2,664        2,664
                                                                    ---------  -----------  -----------
                                                                       52,728  $   361,760  $   414,488
                                                                               -----------  -----------
                                                                               -----------  -----------
Less imputed interest.............................................     (2,912)
                                                                    ---------
                                                                    $  49,816
                                                                    ---------
                                                                    ---------
</TABLE>
 
                                      F-9
<PAGE>
                        PRYON CORPORATION AND SUBSIDIARY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
NOTE 6 -- LEASES (CONTINUED)
    Total  rentals  charged to  operations  approximated $341,000,  $284,000 and
$192,000 for the  years ended December  31, 1995, 1994  and 1993,  respectively.
Total  depreciation charged  to operations  for items  under capital  leases was
approximately $38,000,  $21,000  and  $0,  respectively,  for  the  years  ended
December 31, 1995, 1994 and 1993.
 
NOTE 7 -- INCOME TAXES
    The  provision (benefit)  for income  taxes for  the year  ended December 31
consisted of the following:
 
<TABLE>
<CAPTION>
                                                                            1995
                                                                        ------------
<S>                                                                     <C>
Current...............................................................
  Federal.............................................................  $    278,399
  State...............................................................        64,687
Deferred..............................................................      (343,086)
                                                                        ------------
                                                                        $    --
                                                                        ------------
                                                                        ------------
</TABLE>
 
    The Company had no current or deferred provision for income taxes in 1994 or
1993.
 
    Deferred tax assets at December 31 are comprised of the following:
 
<TABLE>
<CAPTION>
                                                                                1995           1994
                                                                            ------------  --------------
<S>                                                                         <C>           <C>
Net operating loss carryforwards..........................................  $    521,711  $      843,976
Research and development credit carryforwards.............................       300,075         244,729
Other deferred tax assets -- net..........................................        91,951         101,936
                                                                            ------------  --------------
Gross deferred tax asset..................................................       913,737       1,190,641
Deferred tax asset valuation reserve......................................      (913,737)     (1,190,641)
                                                                            ------------  --------------
Net deferred tax asset....................................................  $    --       $     --
                                                                            ------------  --------------
                                                                            ------------  --------------
</TABLE>
 
    Other deferred  tax  items  consist  primarily  of  depreciation,  inventory
capitalization  and other  accrued liabilities  which will  be deducted  for tax
purposes in future periods.
 
    Effective January 1, 1993,  the Company adopted  the Statement of  Financial
Accounting  Standards No. 109,  "Accounting for Income  Taxes", on a prospective
basis and recorded a  deferred tax valuation reserve  of ($825,240) at  December
31, 1993.
 
    At  December  31, 1995,  the Company  has the  following net  operating loss
carryforwards to offset future taxable income:
 
<TABLE>
<CAPTION>
                                                                             INCOME TAX
                                                                              REPORTING      EXPIRES
                                                                            -------------  ------------
<S>                                                                         <C>            <C>
Federal net operating loss................................................  $   1,315,121     2003-2009
State net business loss...................................................      1,431,284     2003-2009
</TABLE>
 
    The net operating loss carryforwards may be limited upon a future change  in
ownership.
 
    Based   on  the  Company's  recent  history  of  operating  losses  and  the
uncertainty  surrounding  its  ability  to  maintain  a  distribution   network,
therefore  its  future  revenue  sources  (See  Note  10  --  Subsequent Event),
management has determined that taxable income sufficient to fully recognize  all
deferred tax assets is not likely.
 
NOTE 8 -- SHAREHOLDERS' EQUITY
 
    COMMON  STOCK  --  At December 31,  1995, 1994 and 1993, there were 419,401,
419,401  and  435,733  shares  of  $.10  par  value  common  stock   authorized,
respectively.
 
                                      F-10
<PAGE>
                        PRYON CORPORATION AND SUBSIDIARY
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
NOTE 8 -- SHAREHOLDERS' EQUITY (CONTINUED)
    STOCK  OPTION PLANS  --   On January 21, 1992 and  on September 1, 1994, the
Company's Board of Directors approved and adopted the 1991 Stock Option Plan and
the 1994 Stock Option Plan (the "Plans"), respectively. Under the provisions  of
the  Plans, the Company  may grant to key  employees, directors and consultants,
either nonqualified or incentive stock options  to purchase up to 24,000  shares
of  its common stock. The  Board of Directors of  the Company, which administers
the Plans may, at its discretion,  grant stock appreciation rights with  respect
to  these options.  All stock  options and  stock appreciation  rights expire at
specified intervals ranging from five to ten  years from the date of grant.  The
vesting period for the stock options and stock appreciation rights issued varies
by  Plan participant in  accordance with the individual  terms of employment and
cumulative length of service to the Company.
 
    The Company granted options under the Plans to certain employees to purchase
6,250, 5,050 and 1,200 shares of common stock during fiscal 1995, 1994 and 1993,
respectively. Exercise prices ranged from $6.00 to $8.00 per share in 1995, were
$5.00 per share  during 1994 and  ranged from  $4.00 to $5.00  per share  during
1993.  These stock options expire in the  period January, 1997 to October, 2004.
During 1995, options were exercised to purchase 40 shares of common stock at  an
exercise  price of $5.00 per share.  During 1994 and 1993, respectively, options
were exercised to purchase  180 and 200  shares of common  stock at an  exercise
price  of $2.00 per  share. Options forfeited  in 1995, 1994  and 1993 under the
Plans totalled 2,880. In accordance with the Plans provisions, forfeited  shares
revert  back to the Plans and are eligible to be regranted. At December 31, 1995
and 1994 there were 21,500 and 15,210 options outstanding and 13,645 and  12,420
options exercisable, respectively.
 
NOTE 9 -- SALES TO MAJOR CUSTOMERS
    Sales  to  three customers  accounted for  approximately  39%, 15%  and 14%,
respectively, of the Company's total sales for the year ended December 31,  1995
and  approximately 42%, 10%  and 13%, respectively, for  the year ended December
31, 1994.  Sales to  two  customers accounted  for  approximately 58%  and  14%,
respectively, of the Company's total sales for the year ended December 31, 1993.
 
    At December 31, 1995, 23%, 20% and 10% of the Company's accounts receivables
relate  to the accounts of three  customers, respectively. At December 31, 1994,
24%, 17% and 11% of the Company's accounts receivables relate to the accounts of
three customers, respectively.
 
NOTE 10 -- SUBSEQUENT EVENT
    On February 20, 1996, the Company entered into a definitive agreement to  be
acquired  by  Protocol Systems,  Inc.  ("Protocol"), a  manufacturer  of patient
monitoring instruments and  systems based  in Beaverton,  Oregon. In  accordance
with  the agreement, the Company's shareholders will receive 2,320,843 shares of
Protocol's common stock in exchange for all of the outstanding capital stock  of
the  Company, subject  to adjustment  under certain  circumstances based  on the
market price of Protocol's common stock  during a specified period prior to  the
closing  of the transaction. The acquisition,  which is expected to be accounted
for as a pooling of interests, is not expected to be completed before June, 1996
and is subject  to the  approval of  the shareholders  of both  the Company  and
Protocol  in addition to the completion  and/or achievement of certain specified
actions or operating result benchmarks. Protocol may waive any of the stipulated
conditions during final negotiations. Protocol intends to operate the Company as
a  wholly-owned  subsidiary  and  to  continue  engineering,  manufacturing  and
original  equipment  manufacturers  sales activities  at  the  Company's current
facility.
 
                                      F-11
<PAGE>
                                                                      APPENDIX A
 
                          AGREEMENT AND PLAN OF MERGER
                                  DATED AS OF
                               FEBRUARY 20, 1996
                                     AMONG
                            PROTOCOL SYSTEMS, INC.,
                          PROTOCOL MERGER CORPORATION
                                      AND
                               PRYON CORPORATION
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                          PAGE NO.
                                                                                                         -----------
<C>        <S>                                                                                           <C>
                                                                                           ARTICLE 1
DEFINITIONS............................................................................................         A-1
     1.1   Defined Terms...............................................................................         A-5
     1.2   Other Defined Terms.........................................................................         A-5
     1.3   Usage of Terms..............................................................................         A-6
                                                                                           ARTICLE 2
THE MERGER; EFFECTIVE TIME; CLOSING.................................................................            A-6
      2.1  The Merger..................................................................................         A-6
      2.2  Effective Time..............................................................................         A-6
      2.3  Closing.....................................................................................         A-6
ARTICLE 3
TERMS OF MERGER........................................................................................         A-6
      3.1  Articles of Incorporation...................................................................         A-6
      3.2  Bylaws......................................................................................         A-6
      3.3  Directors...................................................................................         A-6
      3.4  Officers....................................................................................         A-7
      3.5  Effects of Merger...........................................................................         A-7
ARTICLE 4
MERGER CONSIDERATION; EXCHANGE OR CANCELLATION OF SHARES IN THE MERGER.................................         A-7
      4.1  Merger Consideration; Conversion or Cancellation of Shares in the Merger....................         A-7
      4.2  Stock Options...............................................................................         A-8
      4.3  Payment for Shares..........................................................................         A-9
      4.4  Fractional Shares...........................................................................         A-9
      4.5  Closing of the Company's Transfer Books.....................................................        A-10
      4.6  Escrow of Shares............................................................................        A-10
ARTICLE 5
REPRESENTATIONS AND WARRANTIES OF THE COMPANY..........................................................        A-10
      5.1  Organization and Qualification..............................................................        A-10
      5.2  Capitalization..............................................................................        A-10
      5.3  Subsidiaries................................................................................        A-10
      5.4  Authority Relative to this Agreement........................................................        A-11
      5.5  Company Action..............................................................................        A-11
      5.6  Financial Statements........................................................................        A-11
      5.7  Absence of Certain Changes or Events........................................................        A-12
      5.8  Litigation..................................................................................        A-12
      5.9  Taxes.......................................................................................        A-13
      5.10 Compliance with Permits, Applicable Laws and Agreements.....................................        A-13
      5.11 Employee Plans and Benefit Arrangements.....................................................        A-14
      5.12 Employee Contracts and Non-Disclosure Agreements............................................        A-16
      5.13 Real Property...............................................................................        A-16
      5.14 Tangible Personal Property..................................................................        A-16
      5.15 Intangible Property.........................................................................        A-17
      5.16 Title to Assets.............................................................................        A-18
      5.17 Inventories and Receivables.................................................................        A-18
      5.18 Contracts...................................................................................        A-18
      5.19 Suppliers and Customers.....................................................................        A-19
</TABLE>
 
                                      (i)
<PAGE>
<TABLE>
<C>        <S>                                                                                           <C>
      5.20 Products; Product Warranties................................................................        A-19
      5.21 Environmental Matters.......................................................................        A-19
      5.22 Transactions with Certain Persons...........................................................        A-20
      5.23 Absence of Certain Payments.................................................................        A-20
      5.24 Records.....................................................................................        A-21
      5.25 Insurance...................................................................................        A-21
      5.26 Bank Accounts, Directors and Officers.......................................................        A-21
      5.27 Takeover Provisions Inapplicable............................................................        A-22
      5.28 Financial Advisor...........................................................................        A-22
      5.29 Accounting Matters..........................................................................        A-22
      5.30 Other Negotiations..........................................................................        A-22
      5.31 Investment Company Act......................................................................        A-22
      5.32 No Company Material Adverse Effect..........................................................        A-22
      5.33 Information in Disclosure Documents.........................................................        A-22
      5.34 Disposition of Protocol Common Shares.......................................................        A-23
ARTICLE 6
REPRESENTATIONS AND WARRANTIES OF PROTOCOL.............................................................        A-23
      6.1  Organization and Qualification..............................................................        A-23
      6.2  Capitalization..............................................................................        A-23
      6.3  Subsidiaries................................................................................        A-24
      6.4  Authority Relative to this Agreement........................................................        A-24
      6.5  Protocol Action.............................................................................        A-25
      6.6  Reports and Financial Statements............................................................        A-25
      6.7  Absence of Certain Changes or Events........................................................        A-25
      6.8  Litigation..................................................................................        A-26
      6.9  Fairness Opinion............................................................................        A-26
      6.10 Compliance with Permits, Applicable Laws and Agreements.....................................        A-26
      6.11 Suppliers and Customers.....................................................................        A-26
      6.12 Products....................................................................................        A-26
      6.13 Financial Advisor...........................................................................        A-27
      6.14 Accounting Matters..........................................................................        A-27
      6.15 Investment Company Act......................................................................        A-27
      6.16 Information in Disclosure Documents.........................................................        A-27
ARTICLE 7
REPRESENTATIONS AND WARRANTIES OF MERGER SUB...........................................................        A-28
      7.1  Organization................................................................................        A-28
      7.2  Capitalization..............................................................................        A-28
      7.3  Authority Relative to this Agreement........................................................        A-28
      7.4  Merger Sub Action...........................................................................        A-28
      7.5  Interim Operations of Merger Sub............................................................        A-28
ARTICLE 8
CONDUCT OF BUSINESS PENDING THE MERGER.................................................................        A-29
      8.1  Conduct of Business of the Company..........................................................        A-30
      8.2  Conduct of Business of Protocol.............................................................        A-30
      8.3  Conduct of Business of Merger Sub...........................................................        A-30
      8.4  Notice of Breach............................................................................        A-30
ARTICLE 9
ADDITIONAL AGREEMENTS..................................................................................        A-30
      9.1  Meetings of Shareholders....................................................................        A-30
      9.2  Registration Statement/Proxy Materials......................................................        A-31
      9.3  Affiliates of Protocol and the Company......................................................        A-32
</TABLE>
 
                                      (ii)
<PAGE>
<TABLE>
<C>        <S>                                                                                           <C>
      9.4  Registration and Quotation of Protocol Common Shares........................................        A-32
      9.5  Tax Treatment of Merger.....................................................................        A-32
      9.6  Reasonable Efforts..........................................................................        A-32
      9.7  Other Transactions..........................................................................        A-33
      9.8  Access to Information.......................................................................        A-33
      9.9  Employee Matters............................................................................        A-33
      9.10 Payment of Shareholder Notes Payable........................................................        A-34
      9.11 Indemnification of Officers and Directors...................................................        A-34
ARTICLE 10
CONDITIONS PRECEDENT...................................................................................        A-34
     10.1  Conditions to Each Party's Obligations......................................................        A-34
     10.2  Conditions to Obligations of Protocol and Merger Sub........................................        A-35
     10.3  Conditions to Obligations of the Company....................................................        A-36
ARTICLE 11
TERMINATION, AMENDMENT AND WAIVER......................................................................        A-38
     11.1  Termination.................................................................................        A-38
     11.2  Effect of Termination.......................................................................        A-38
     11.3  Amendment...................................................................................        A-38
     11.4  Waiver......................................................................................        A-39
ARTICLE 12
SURVIVAL AND INDEMNIFICATION...........................................................................        A-39
     12.1  Indemnification by the Company..............................................................        A-39
     12.2  Indemnification by Protocol.................................................................        A-39
     12.3  Survival....................................................................................        A-39
     12.4  Limitations Upon Indemnification............................................................        A-40
ARTICLE 13
GENERAL PROVISIONS.....................................................................................        A-40
     13.1  Expenses....................................................................................        A-40
     13.2  Public Announcements........................................................................        A-40
     13.3  Notices, Etc................................................................................        A-41
     13.4  Attorneys' Fees.............................................................................        A-41
     13.5  Severability................................................................................        A-41
     13.6  Remedies Cumulative.........................................................................        A-41
     13.7  No Third-Party Beneficiaries................................................................        A-41
     13.8  Jurisdiction................................................................................        A-41
     13.9  Governing Law...............................................................................        A-42
     13.10 Assignment..................................................................................        A-42
     13.11 Names, Captions, Etc........................................................................        A-42
     13.12 Schedules...................................................................................        A-42
     13.13 Exhibits....................................................................................        A-42
     13.14 Entire Agreement............................................................................        A-42
     13.15 Counterparts................................................................................        A-42
  Signature Page.......................................................................................        A-44
</TABLE>
 
                                     (iii)
<PAGE>
                          AGREEMENT AND PLAN OF MERGER
 
    AGREEMENT AND PLAN OF MERGER (hereinafter called this "Agreement"), dated as
of  February  20,  1996, among  PROTOCOL  SYSTEMS, INC.,  an  Oregon corporation
("Protocol"), PROTOCOL  MERGER  CORPORATION, a  Wisconsin  corporation  ("Merger
Sub"), and PRYON CORPORATION, a Wisconsin corporation (the "Company"):
 
                                    RECITALS
 
    A.   Protocol  and the  Company desire to  effect a  business combination by
means of the merger of Merger Sub with and into the Company.
 
    B.  The Boards  of Directors of  Protocol, Merger Sub  and the Company  each
have determined that it is in the best interest of their respective shareholders
for Merger Sub to merge with and into the Company, upon the terms and subject to
the conditions of this Agreement.
 
    C.   For federal income  tax purposes, it is  intended that the Merger shall
qualify as a reorganization within the meaning of Section 368(a) of the Code.
 
    D.  The parties intend that  the Merger be recorded for accounting  purposes
as a pooling of interests.
 
    E.     Protocol,  Merger  Sub  and   the  Company  desire  to  make  certain
representations, warranties,  covenants and  agreements in  connection with  the
Merger.
 
    NOW,  THEREFORE, in consideration of the mutual representations, warranties,
covenants and agreements set forth herein, the parties hereby agree as follows:
 
                                   ARTICLE 1
 
                                  DEFINITIONS
 
1.1  DEFINED TERMS
 
    As used in  this Agreement, the  following terms shall  have the  respective
meanings set forth below:
 
    "Affiliate": As defined in Rule 12b-2 under the Exchange Act.
 
    "Aggregate Ceiling Price": $31,300,000.
 
    "Aggregate Floor Price": $24,700,000.
 
    "Aggregate Merger Consideration": 2,320,843 Protocol Common Shares.
 
    "Articles  of Merger": The articles of merger  with respect to the merger of
Merger Sub with and into the Company, containing the provisions required by, and
executed in accordance with, Section 180.1105 of the WBCL.
 
    "Authorization": Any consent,  approval or authorization  of, expiration  or
termination  of  any waiting  period  requirement by,  or  filing, registration,
qualification, declaration or  designation with, any  Governmental Authority  or
other Person.
 
    "Business  Records":  All originals  and copies  of  all operating  data and
records of the Company including, without limitation, financial, accounting  and
bookkeeping  books and records, Device Master Records, customer complaint files,
product quality documentation, purchase and sale orders and invoices, sales  and
sales  promotional  data, advertising  materials,  marketing analyses,  past and
present price  lists, past  and present  customer service  files, credit  files,
warranty  files,  batch and  product serial  number  records and  files, written
operating methods and procedures, specifications,
 
                                      A-1
<PAGE>
operating records  and  other  information  related  to  the  Tangible  Personal
Property,  reference catalogues,  insurance files,  personnel records  and other
records, on  whatever media,  pertaining  to the  Company,  or to  customers  or
suppliers   of,  or  any  other  parties  having  contracts  or  other  business
relationships with, the Company.
 
    "Closing": The closing of the Merger as described in Article 2.
 
    "Closing Date": The date on which the Closing occurs.
 
    "Code": The Internal Revenue Code of  1986, as amended, and all  regulations
promulgated thereunder, as in effect from time to time.
 
    "Company": Pryon Corporation, a Wisconsin corporation.
 
    "Company  Common Stock":  Common Stock,  $0.10 par  value per  share, of the
Company.
 
    "Company Disclosure Schedule":  The disclosure  schedule dated  the date  of
this Agreement, delivered by the Company to Protocol and attached hereto.
 
    "Company's  Knowledge" or its like: That which any Company Senior Management
Member actually knows or with reasonable diligence should know.
 
    "Company  Senior  Management   Members":  Daniel  F.   Carsten,  Edward   M.
Kolasinski,  Robert H.  Ricciardelli, William  Hand, Anthony  Dalnodar, Kathleen
Slater, Gunter Frey, Lisa Henke and Robert M. Sommer.
 
    "Company Series  A Preferred  Stock": Series  A Preferred  Stock, $0.10  par
value per share, of the Company.
 
    "Company  Series B  Preferred Stock":  Series B  Preferred Stock,  $0.10 par
value per share, of the Company.
 
    "Confidentiality Agreement": The  letter agreement between  the Company  and
Protocol dated January 26, 1996.
 
    "Contract":  Any  written  or oral  contract,  open order,  lease  and other
agreement in which  the Company  is a  party or by  which the  Company is  bound
(other  than the Employee Contracts and  the Minor Contracts) including, without
limitation,  all  distributor,  sales  representative  and  dealer   agreements,
purchase  and  supply  contracts,  leases,  maintenance  contracts,  license and
royalty agreements,  government contracts,  partnering agreements,  indebtedness
instruments,   letters  of   credit,  performance   bonds,  currency  contracts,
agreements with respect  to guaranties, suretyships,  covenants not to  compete,
confidentiality  or indemnification by or  for the benefit of  the Company or by
which the Company is bound, purchase and sale orders and all other contracts and
agreements whatsoever, and all amendments relating to any of the foregoing.
 
    "Corporate Records": The Company's articles of incorporation (including  all
amendments   thereto),  bylaws  (including  all  amendments  thereto),  minutes,
unanimous written consents, resolutions,  stock records, stock transfer  ledger,
cancelled   certificates  and  other  documents  customarily  contained  in  the
corporate minute book for such an entity.
 
    "Employee Contract": Any written  or oral contract, agreement,  arrangement,
policy,  program,  plan or  practice (exclusive  of any  such contract  which is
terminable within thirty (30) days without liability to the Company) directly or
indirectly  providing   for  or   relating   to  any   employment,   consulting,
remuneration,  compensation or benefit, severance  or other similar arrangement,
insurance coverage (including any self-insured arrangements),
medical-surgical-hospital  or  other  health  benefits,  workers'  compensation,
disability  benefits,  supplemental employment  benefits, vacation  benefits and
other forms of paid or unpaid leave, retirement benefits, tuition reimbursement,
deferred compensation, savings  or bonus plans,  profit-sharing, stock  options,
stock   appreciation  rights,  or  other  forms  of  incentive  compensation  or
post-retirement compensation or benefit, employment guarantee
 
                                      A-2
<PAGE>
or security, or limitation on right  to discipline or discharge, or relating  to
confidentiality,  noncompetition or the like which  (i) is not an Employee Plan,
(ii) has been entered into or maintained, as the case may be, by the Company and
(iii) covers any one or more Employee.
 
    "Environmental Laws": All  present federal,  state and  local laws  (whether
under  common law, statute,  rule, regulation or  otherwise), Permits, and other
requirements of Governmental  Authorities relating  to the  protection of  human
health  or the environment or to any Environmental Materials. Such laws include,
without limitation, the Comprehensive  Environmental Response, Compensation  and
Liability  Act; Resource Conservation  and Recovery Act;  Clean Water Act; Clean
Air Act; Hazardous Materials Transportation  Act; Toxic Substances Control  Act;
Occupational Safety and Health Act; and their state and local counterparts.
 
    "Environmental  Materials":  Materials  that,  because  of  their  quantity,
concentration or physical, chemical or infectious characteristics, may cause  or
pose  a present  or potential  hazard to  human health  or the  environment when
improperly  used,  treated,  stored,   disposed  of,  generated,   manufactured,
transported  or otherwise handled.  "Hazardous Materials" shall  include, but is
not limited to, any and all  hazardous or toxic substances, materials or  wastes
as defined or listed under the Resource Conservation and Recovery Act, the Toxic
Substances  Control Act, the  Comprehensive Environmental Response, Compensation
and Liability Act, the Hazardous  Materials Transportation Act, the Clean  Water
Act,  the Clean Air Act  or any other of  the Environmental Laws. "Environmental
Materials" shall  specifically include,  but  not be  limited to,  petroleum  or
petroleum products, including crude oil and any fraction thereof.
 
    "ERISA":  The Employee Retirement  Income Security Act  of 1974, as amended,
and all regulations promulgated thereunder.
 
    "ERISA Affiliates": Any trade or business, whether or not incorporated, that
is now or has at any time in the past been treated as a single employer with the
Company or its Subsidiaries, if any, under Section 414(b) or (c) of the Code and
the Treasury Regulations thereunder.
 
    "Exchange Act": The Securities Exchange Act of 1934, as amended.
 
    "GAAP": Generally  accepted accounting  principles in  effect from  time  to
time.
 
    "Governmental   Authority":   Any  federal,   state,   municipal,  political
subdivision or other governmental department, commission, board, bureau,  agency
or instrumentality, domestic or foreign.
 
    "Intangible  Property": All intellectual property rights, including, but not
limited to, patents, patent applications, trademarks, trademark applications and
registrations, service  marks,  service  mark  applications  and  registrations,
copyrights,  licenses  and  customer  lists,  proprietary  processes,  formulae,
inventions, trade  secrets, know-how,  development tools  and other  proprietary
rights  used  by the  Company  pertaining to  any  product, software  or service
manufactured, marketed, licensed or  sold by the Company  in the conduct of  its
business  or  used,  employed  or  exploited,  or  available  for  use,  in  the
development, license, sale, marketing, distribution or maintenance thereof,  and
all  documentation and media constituting, describing  or relating to the above,
including,  but  not  limited  to,  manuals,  memoranda,  know-how,   notebooks,
software, records and disclosures.
 
    "Lien":  Any mortgage, pledge, lien,  charge, encumbrance, security interest
or claim.
 
    "Merger": The merger of Merger Sub with and into the Company as contemplated
by Section 2.1.
 
    "Merger Sub": Protocol  Merger Corporation,  a Wisconsin  corporation and  a
direct wholly owned Subsidiary of Protocol.
 
    "Minor  Contracts":  Any blanket  inventory purchase  order in  an aggregate
amount of less than $25,000  annually and of a duration  of less than one  year,
any other purchase and sale order under
 
                                      A-3
<PAGE>
$10,000,  or  any agreements  relating to  office equipment,  production support
equipment, maintenance, security or utilities, or other contracts and agreements
which, in the aggregate for all contracts and/or agreement with any one  Person,
result in the incurrence of annual expenditures of less than $10,000.
 
    "NASD": The National Association of Securities Dealers, Inc.
 
    "Nasdaq/NMS": The NASD Automated Quotations/National Market System.
 
    "Order":  Any judgment, writ, injunction, order, directive, ruling or decree
of any arbitrator or any court or other Governmental Authority.
 
    "Peat Marwick": KPMG Peat Marwick, LLP.
 
    "Permits":  All   permits,   licenses,  franchises,   consents,   variances,
exemptions, Authorizations and the like issued by Governmental Authorities to or
for the benefit of the Company or Protocol (as the case may be).
 
    "Person":  Any  individual  or  corporation,  company,  general partnership,
limited partnership, limited liability  company, limited liability  partnership,
trust, incorporated or unincorporated association, joint venture or other entity
of any kind.
 
    "Proceeding":   Any  claim,  suit,  action,  arbitration,  investigation  or
proceeding.
 
    "Protocol": Protocol Systems, Inc., an Oregon corporation.
 
    "Protocol Common Shares": Shares of Common Stock, $.01 par value per  share,
of Protocol.
 
    "Protocol  Disclosure Schedule": The  disclosure schedule dated  the date of
this Agreement, delivered by Protocol to the Company and attached hereto.
 
    "Protocol Financial Statements":  The financial statements  included in  the
Protocol SEC Reports.
 
    "Protocol  Market  Value": The  average  of the  closing  sale price  of one
Protocol Common  Share, as  reported  on the  Nasdaq/NMS,  for the  thirty  (30)
consecutive trading days ending on June 14, 1996.
 
    "Protocol  Option Plans": The stock option plans for employees, officers and
directors of Protocol identified in the Protocol SEC Reports.
 
    "Real Property": All real property now or in the past owned or leased by the
Company or  any other  Person to  which the  Company is  or is  deemed to  be  a
successor  in  interest,  whether  directly  or  indirectly  (including, without
limitation, by merger, under applicable Environmental Laws or otherwise), or  in
which  the Company  or any  such other  Person has  now or  in the  past had any
interest, together with (i) all  buildings and improvements located thereon  and
(ii)   all   rights,   privileges,  interests,   easements,   hereditaments  and
appurtenances relating thereto.
 
    "Release": Any  spilling,  leaking, pumping,  pouring,  emitting,  emptying,
discharging, injecting, escaping, leaching, migration, dumping or disposing into
the environment.
 
    "Relevant  Company Insider": Any holder of  more than 10% of the outstanding
Shares, and/or  any executive  officer, director,  sales manager  or  purchasing
agent of the Company.
 
    "SEC": The Securities and Exchange Commission.
 
    "Securities Act": The Securities Act of 1933, as amended.
 
    "Shares": Collectively, the shares of Company Common Stock, Company Series A
Preferred Stock and Company Series B Preferred Stock.
 
    "Subsidiary":  As to any Person,  any other Person of  which at least 50% of
the equity or voting interests are owned, directly or indirectly, by such  first
Person.
 
                                      A-4
<PAGE>
    "Surviving Corporation": The surviving corporation in the Merger.
 
    "Tangible  Personal Property":  All tangible  personal property  (other than
inventory) used to conduct the Company's business including, without limitation,
production and  processing equipment,  warehouse equipment,  computer  hardware,
furniture   and  fixtures,  transportation  equipment,  leasehold  improvements,
supplies and other tangible assets, together with any transferable  manufacturer
or vendor warranties related thereto.
 
    "WBCL":  Wisconsin Statutes Annotated, Chapter  180, known as the "Wisconsin
Business Corporation Law."
 
1.2  OTHER DEFINED TERMS
 
<TABLE>
<CAPTION>
            TERM                                           SECTION
            ----------------------------------------      ----------
            <S>                                           <C>
            Affected Employees                            9.9
            Applicable Merger Consideration               4.1.1
            Authorized Representatives                    9.8
            Benefit Arrangement                           5.11.1
            Budget                                        10.2.7
            Certificates                                  4.3.1.
            COBRA                                         5.11.10.
            Company Fairness Opinion                      5.28
            Company Financial Statements                  5.6.1
            Company Material Adverse Effect               5.1
            Company Option Plans                          4.2.1
            Company Permits                               5.10.1
            Company Shareholders Meeting                  9.1.1
            Company Voting Debt                           5.2
            Cowen                                         5.28
            Disclosing Party                              12.4
            Effective Time                                2.2
            Employee Plan                                 5.11.1
            Employees                                     5.11.1
            Escrow Agent                                  4.6
            Escrow Agreement                              4.6
            Escrow Shares                                 4.6
            Exchange Ratio Certificate                    4.1.1
            Existing Option                               4.2.1
            Indemnifiable Damages                         12.4
            Insurance                                     5.25
            Issuance                                      9.1.2
            Protocol Fairness Opinion                     6.9
            Protocol Material Adverse Effect              6.1
            Protocol Permits                              6.10
            Protocol SEC Reports                          6.6.1
            Protocol Shareholders Meeting                 9.1.2
            Protocol Voting Debt                          6.2
            Proxy Statement/Prospectus                    9.2.2
            Registered Intangible Property                5.15.1
            Registration Statement                        9.2.1
            Related Person                                5.22
            Replacement Option                            4.2.1
            Rule 145 Affiliates                           9.3.1
            Shareholder Notes Payable                     5.22
</TABLE>
 
                                      A-5
<PAGE>
<TABLE>
<CAPTION>
            TERM                                           SECTION
            ----------------------------------------      ----------
            <S>                                           <C>
            Significant Subsidiaries                      6.3
            Tax                                           5.9.10
            Tax Return                                    5.9.10
            Transfer Agent                                4.3.1
            Voting Agreement                              9.1.1
            Wessels                                       6.9
</TABLE>
 
1.3  USAGE OF TERMS
 
    Except where the  context otherwise requires,  words importing the  singular
number shall include the plural number and vice versa.
 
                                   ARTICLE 2
 
                      THE MERGER; EFFECTIVE TIME; CLOSING
2.1  THE MERGER
 
    Subject  to the  terms and  conditions of  this Agreement,  at the Effective
Time, Merger Sub shall be  merged with and into  the Company in accordance  with
the  provisions of the WBCL and with  the effect provided in Section 180.1106 of
the WBCL. The separate corporate existence  of Merger Sub shall thereupon  cease
and  the Company  shall be  the Surviving Corporation  and shall  continue to be
governed by the laws of the State of Wisconsin.
 
2.2  EFFECTIVE TIME
 
    The Merger  shall  become  effective  on  the date  and  at  the  time  (the
"Effective Time") that the Articles of Merger, properly executed, are duly filed
with  the Secretary of State  of the State of Wisconsin  (or such later date and
time as may be specified in the Articles of Merger), which shall be the  Closing
Date or as soon as practicable thereafter.
 
2.3  CLOSING
 
    Subject  to the fulfillment or waiver of the conditions set forth in Article
10, the Closing shall take place (a) at the offices of Ater Wynne Hewitt  Dodson
& Skerritt, 222 S.W. Columbia, Suite 1800, Portland, Oregon 97201, at 10:00 a.m.
within  three business days of the date of  receipt of the last of the approvals
required by Sections 10.1.1 and 10.1.2 but not earlier than June 2, 1996, or (b)
at such other place and/or  time and/or on such other  date as Protocol and  the
Company  may agree or as may be necessary to permit the fulfillment or waiver of
the conditions set forth in Article 10.
 
                                   ARTICLE 3
 
                                TERMS OF MERGER
3.1  ARTICLES OF INCORPORATION
 
    The articles of incorporation of Merger  Sub as in effect immediately  prior
to  the Effective Time shall  be the articles of  incorporation of the Surviving
Corporation, except that Article 1 thereof shall be amended to read as follows:
 
    "The name of this corporation is Pryon Corporation."
 
3.2  BYLAWS
 
    The bylaws of  Merger Sub as  in effect immediately  prior to the  Effective
Time shall be the bylaws of the Surviving Corporation.
 
3.3  DIRECTORS
 
    Subject  to the next sentence, the directors of Merger Sub immediately prior
to the Effective Time shall, from and after the Effective Time, be the directors
of the Surviving Corporation  until their successors have  been duly elected  or
appointed  and qualified or until their earlier death, resignation or removal in
accordance with  the  Surviving  Corporation's  articles  of  incorporation  and
bylaws.
 
                                      A-6
<PAGE>
Promptly  after the Effective  Time, Protocol shall  take such action  as may be
necessary to cause Daniel F. Carsten to be elected to the board of directors  of
the Surviving Corporation, to serve until his successor has been duly elected or
appointed  and qualified or  until his earlier death,  resignation or removal in
accordance with  the  Surviving  Corporation's  articles  of  incorporation  and
bylaws.  Promptly after the  Effective Time, Protocol shall  take such action as
may be  necessary to  cause Daniel  F. Carsten  to be  elected to  the board  of
directors  of Protocol, to  serve until his  successor has been  duly elected or
appointed and qualified or  until his earlier death,  resignation or removal  in
accordance with Protocol's articles of incorporation and bylaws.
 
3.4  OFFICERS
 
    Subject  to the next sentence, the officers of the Company immediately prior
to the Effective Time shall, from and after the Effective Time, be the  officers
of  the Surviving Corporation  until their successors have  been duly elected or
appointed and qualified or until their earlier death, resignation or removal  in
accordance  with  the  Surviving  Corporation's  articles  of  incorporation and
bylaws. Promptly after the  Effective Time, Protocol shall  take such action  as
may  be necessary to cause  Daniel F. Carsten to be  elected as the President of
the Surviving Corporation, to serve until his successor has been duly elected or
appointed and qualified or  until his earlier death,  resignation or removal  in
accordance  with  the  Surviving  Corporation's  articles  of  incorporation and
bylaws.
 
3.5  EFFECTS OF MERGER
 
    The Merger shall have the effects set forth in Section 180.1106 of the WBCL.
The corporate  existence of  the  Company, with  all  its purposes,  powers  and
objects,  shall continue  unaffected and  unimpaired by  the Merger  and, as the
Surviving Corporation, the Company shall be governed by the laws of the State of
Wisconsin and  succeed to  all rights,  assets, liabilities  and obligations  of
Merger Sub in accordance with Section 180.1106 of the WBCL.
 
                                   ARTICLE 4
 
     MERGER CONSIDERATION; EXCHANGE OR CANCELLATION OF SHARES IN THE MERGER
 
4.1  MERGER CONSIDERATION; CONVERSION OR CANCELLATION OF SHARES IN THE MERGER
 
    Subject  to the  provisions of  this Article  4, at  the Effective  Time, by
virtue of the Merger and  without any action by  holders thereof, the shares  of
the constituent corporations shall be converted as follows:
 
    4.1.1  (a)  All Company Common Shares, Company Series A Preferred Shares and
Company Series B Preferred  Shares issued and  outstanding immediately prior  to
the  Effective  Time  (other  than  Shares as  to  which  dissenters'  rights of
appraisal have been  duly sought  and are  not subsequently  withdrawn) and  all
Shares issuable upon exercise of Existing Options under the Company Option Plans
shall,  collectively,  be  exchanged  for  the  Aggregate  Merger  Consideration
(subject to adjustment as provided in Section 4.1.1 (b) below), to be  allocated
among  such Shares in accordance with the rights of each such class or series as
set forth in the Company's Articles of Incorporation, as conclusively  certified
by  an instrument signed by the  Company's Chief Financial Officer and delivered
to Protocol on the Closing Date (the "Exchange Ratio Certificate").
 
    (b) The Aggregate Merger Consideration shall be adjusted in accordance  with
the provisions of this paragraph (b) of Section 4.1.1.
 
        (i)  Notwithstanding Section 4.1.1 (a), if  the Protocol Market Value is
    less  than  $10.643,  then  the  Aggregate  Merger  Consideration  shall  be
    increased  to that number  of Protocol Common  Shares which is  equal to the
    number obtained by dividing the Aggregate Floor Price by the Protocol Market
    Value.
 
                                      A-7
<PAGE>
        (ii) Notwithstanding Section 4.1.1 (a), if the Protocol Market Value  is
    more  than  $13.486,  then  the  Aggregate  Merger  Consideration  shall  be
    decreased to that  number of Protocol  Common Shares which  is equal to  the
    number  obtained by  dividing the  Aggregate Ceiling  Price by  the Protocol
    Market Value.
 
    (c) The term  "Applicable Merger Consideration"  means the Aggregate  Merger
Consideration set forth in Section 4.1.1 (a), as adjusted, if at all pursuant to
Section 4.1.1 (b).
 
    4.1.2  If, prior to the Effective Time, Protocol should split or combine the
Protocol  Common Shares, or pay a stock  dividend or other stock distribution in
Protocol Common Shares, or otherwise change the Protocol Common Shares into  any
other  securities, or  make any other  dividend or distribution  on the Protocol
Common Shares, then  the Applicable Merger  Consideration will be  appropriately
adjusted  to reflect such split, combination,  dividend or other distribution or
change.
 
    4.1.3  All  Shares to be  exchanged for Protocol  Common Shares pursuant  to
Section  4.1.1 shall cease to be outstanding, shall be cancelled and retired and
shall cease to  exist, and each  holder of a  certificate representing any  such
Shares  shall thereafter cease to  have any rights with  respect to such Shares,
except the right to receive for each  of the Shares, upon the surrender of  such
certificate in accordance with Section 4.3, the number of Protocol Common Shares
specified  above,  as  adjusted for  any  fractional Protocol  Common  Shares as
contemplated by Section 4.4.
 
    4.1.4  Each share of Common Stock, $0.01 par value per share, of Merger  Sub
issued  and  outstanding  immediately  prior  to  the  Effective  Time  shall be
converted into  and become  one fully  paid and  nonassessable share  of  Common
Stock, $0.01 par value per share, of the Surviving Corporation.
 
4.2  STOCK OPTIONS
 
    4.2.1   On  or before  the Closing Date,  the Company  shall make reasonable
efforts  to  obtain  a  written  agreement  (in  form  and  substance   mutually
satisfactory  to Protocol  and the Company)  from each holder  of an outstanding
option to purchase Shares  (each, an "Existing Option")  issued pursuant to  the
Pryon  Corporation 1991 Stock  Option Plan and the  Pryon Corporation 1994 Stock
Option Plan,  as applicable  (the "Company  Option Plans"),  that each  Existing
Option  held by  such holder,  whether or  not vested  or exercisable,  which is
outstanding at the Effective Time shall be replaced by an option (a "Replacement
Option") to acquire, on the same  terms and conditions as were applicable  under
the  Existing Option, a number of Protocol  Common Shares (rounded up or down to
the nearest whole  share) equal to  the product  of (a) the  exchange ratio  for
Company Common Shares as set forth in the Exchange Ratio Certificate and (b) the
number  of Shares which the  holder would have been  entitled to receive had the
holder exercised the Existing Option in full immediately prior to the  Effective
Time  (whether or not the Existing Option shall then have been exercisable). The
price per share  under the Replacement  Option shall be  equal to the  aggregate
exercise  price for  the Shares  subject to the  Existing Option  divided by the
number of full Protocol Common Shares  deemed to be purchasable pursuant to  the
Existing Option. Regardless of whether such written agreements are obtained from
the holders of Existing Options, each of the Existing Options shall be converted
without  any action on the part of  the holder thereof into a Replacement Option
on the terms set forth in this Section.
 
    4.2.2  Promptly after the Effective Time, option agreements for  Replacement
Options  shall be delivered to holders  of Existing Options. Replacement Options
shall have terms which are substantially identical to the terms of the  Existing
Options  they  replace, including,  without limitation,  substantially identical
vesting schedules. A list of all persons who are holders of Existing Options  as
of  the date of this Agreement, the number of Shares under option to each holder
as of such date and  the exercise price per share  under those options has  been
delivered to Protocol as part of Section 5.2 of the Company Disclosure Schedule.
 
    4.2.3   Protocol  shall take all  corporate action necessary  to reserve for
issuance a  sufficient  number  of  Protocol Common  Shares  for  delivery  upon
exercise of the Replacement Options. Promptly after the Effective Time, Protocol
shall  file a registration statement or registration statements on Form S-8 with
respect to  Protocol  Common Shares  subject  to such  Replacement  Options  and
maintain
 
                                      A-8
<PAGE>
the  effectiveness of any such registration statement or registration statements
(and shall  maintain  the  current  status of  the  prospectus  or  prospectuses
contained therein) for so long as such Replacement Options remain outstanding.
 
4.3  PAYMENT FOR SHARES
 
    4.3.1   Prior to the Closing, Protocol shall select First Interstate Bank of
Oregon, N.A. or  such other  person or  persons reasonably  satisfactory to  the
Company  to act as Exchange Agent for the Merger (the "Transfer Agent"). Subject
to Section 4.6, as soon as practicable after the Effective Time, Protocol  shall
make  available, and  each holder  of Shares will  be entitled  to receive, upon
surrender to  the Transfer  Agent of  one or  more instruments  or  certificates
representing  the  Shares  ("Certificates")  for  cancellation  and  such  other
documents reasonably requested by the Transfer Agent, certificates  representing
the number of Protocol Common Shares into which such Shares are converted in the
Merger. Any Fractional Protocol Common Shares to be withheld shall be rounded to
the nearest whole share.
 
    4.3.2   Protocol Common  Shares for which  Shares shall be  exchanged in the
Merger shall be  deemed to have  been issued  at the Effective  Time. After  the
Effective  Time, Certificates representing the Shares shall represent solely the
right to receive Protocol Common Shares.
 
    4.3.3   Any  holder  of  Shares  who  has  not  exchanged  the  Certificates
representing  the Shares for  Protocol Common Shares  in accordance with Section
4.3.1 within six  months after the  Effective Time shall  have no further  claim
upon  the Transfer Agent and shall thereafter  look only to Protocol for payment
in respect of such Shares. If  any Certificates representing Shares entitled  to
payment pursuant to Section 4.1 shall not have been surrendered for such payment
prior  to such  date on  which any  payment in  respect thereof  would otherwise
escheat  to  or  become  the   property  of  any  Governmental  Authority,   the
Certificates evidencing such Shares shall, to the extent permitted by applicable
law,  be deemed to be canceled and no money or other property will be due to the
holder thereof.
 
    4.3.4  No  dividends or  other distributions that  are declared  or made  on
Protocol  Common Shares will be paid to Persons entitled to receive certificates
representing Protocol  Common  Shares  pursuant to  this  Agreement  until  such
Persons  surrender their Certificates representing  Shares. Upon such surrender,
there shall be paid  to the Person in  whose name the certificates  representing
such Protocol Common Shares shall be issued any dividends or other distributions
which  shall have become payable with respect  to such Protocol Common Shares in
respect of a record date after the Effective Time. In no event shall the  Person
entitled  to  receive such  dividends be  entitled to  receive interest  on such
dividends.
 
    4.3.5  In the event that any certificates for Protocol Common Shares are  to
be  issued in  a name  other than  that in  which the  Certificates representing
Shares surrendered in exchange therefor are registered, it shall be a  condition
of  such exchange that  the Certificate or Certificates  so surrendered shall be
properly endorsed  or be  otherwise in  proper form  for transfer  and that  the
Person  requesting such exchange shall pay to the Transfer Agent any transfer or
other taxes required by reason of  the issuance of Certificates for such  shares
of  Protocol Common Shares in a name other than that of the registered holder of
the Certificate  surrendered, or  shall  establish to  the satisfaction  of  the
Transfer Agent that such tax has been paid or is not applicable.
 
    4.3.6   Notwithstanding  the foregoing, neither  the Transfer  Agent nor any
party hereto shall  be liable  to a  holder of  Shares for  any Protocol  Common
Shares  or  dividends thereon  delivered to  a public  official pursuant  to any
applicable escheat laws.
 
4.4  FRACTIONAL SHARES
 
    No fractional Protocol  Common Shares  shall be  issued in  the Merger.  Any
fractional  amount  resulting  from the  exchange  as described  above  shall be
rounded up if in excess of one-half a Protocol Common Share, or down if one-half
a Protocol Common Share or less, to the nearest full share.
 
                                      A-9
<PAGE>
4.5  CLOSING OF THE COMPANY'S TRANSFER BOOKS
 
    At the Effective  Time, the  stock transfer books  of the  Company shall  be
closed  and no transfer of  Shares shall be made  thereafter. In the event that,
after  the  Effective  Time,  Certificates   are  presented  to  the   Surviving
Corporation,  they shall be canceled and exchanged for Protocol Common Shares as
provided in Sections 4.1 and 4.4.
 
4.6  ESCROW OF SHARES
 
    At or immediately subsequent to the Closing, Protocol shall deliver to First
Interstate Bank of Oregon, N.A. (the "Escrow Agent"), as escrow agent,  Protocol
Common Shares into which the Shares are exchanged under Section 4.1 but withheld
by  Protocol as provided in  the next sentence ("Escrow  Shares"), to be held by
Escrow Agent as collateral  for the indemnification  obligations of the  Company
under  Article 12 hereof and  pursuant to the provisions  of an escrow agreement
("Escrow Agreement") in substantially the form  attached as Exhibit 4.6 to  this
Agreement.  Protocol shall withhold on a pro rata basis ten percent (10%) of the
Protocol Common Shares to be received  by each holder of outstanding Shares  and
such  Escrow Shares shall be represented by a certificate or certificates issued
in the name of First Interstate Bank of Oregon, N.A., as Escrow Agent.
 
                                   ARTICLE 5
 
                 REPRESENTATIONS AND WARRANTIES OF THE COMPANY
 
    The Company represents and warrants to Protocol and Merger Sub that,  except
as set forth in the Company Disclosure Schedule:
 
5.1  ORGANIZATION AND QUALIFICATION
 
    The  Company is a corporation duly  organized and validly existing under the
laws of the  State of  Wisconsin and  has the corporate  power to  carry on  its
business  as it is now  being conducted and currently  proposed to be conducted.
The Company has, during its most  recently completed reporting year, filed  with
the  Wisconsin Secretary  of State  an annual report  required by  the WBCL. The
Company has  not  filed articles  of  dissolution  and no  corporate  action  to
dissolve  the Company has been taken. The Company is duly qualified as a foreign
corporation to do business, and is in good standing, in each jurisdiction  where
the  character of its properties owned or held  under lease or the nature of its
activities makes such qualification necessary, except where the failure to be so
qualified will not have an effect on the business, properties, assets, condition
(financial or otherwise),  liabilities, operations or  prospects of the  Company
taken  as a whole in an amount in excess of $25,000 (a "Company Material Adverse
Effect").
 
5.2  CAPITALIZATION
 
    The authorized capital stock  of the Company consists  of 419,401 shares  of
Company  Common Stock,  of which  75,408 shares are  outstanding as  of the date
hereof; 60,000 shares of  Series A Preferred Stock,  of which 58,505 shares  are
outstanding  as of  the date  hereof; and  80,599 shares  of Series  B Preferred
Stock, of  which  80,599 shares  are  outstanding as  of  the date  hereof.  All
outstanding  Shares  were  duly  authorized,  validly  issued,  fully  paid  and
nonassessable (subject  to Section  180.0622(2)(b) of  the WBCL,  as  judicially
interpreted).  No Shares  are held  in the  Company's treasury.  As of  the date
hereof, there are no bonds, debentures, notes or other evidences of indebtedness
having the right to vote on any matters on which the Company's shareholders  may
vote  ("Company  Voting  Debt") issued  or  outstanding. There  are  no options,
warrants, calls or  other rights,  agreements or  commitments outstanding  which
obligate  the Company to issue,  deliver or sell shares  of its capital stock or
debt securities, or which  obligate the Company to  grant, extend or enter  into
any such option, warrant, call or other such right, agreement or commitment.
 
5.3  SUBSIDIARIES
 
    The  Company has no Subsidiaries and does not directly or indirectly own any
interest in any other Person.
 
                                      A-10
<PAGE>
5.4  AUTHORITY RELATIVE TO THIS AGREEMENT
 
    5.4.1  The Company has the corporate power to enter into this Agreement and,
subject to approval of this Agreement by the holders of the Shares, to carry out
its obligations hereunder.
 
    5.4.2  The execution and delivery of this Agreement and the consummation  of
the  transactions contemplated hereby have been duly authorized by the Company's
Board of Directors. Except for the  approval of the holders of Shares  described
in  Section 9.1.1, no other corporate proceedings on the part of the Company are
necessary to authorize this Agreement and the transactions contemplated hereby.
 
    5.4.3  This  Agreement constitutes  a valid  and binding  obligation of  the
Company,  enforceable against the Company in accordance with its terms except as
enforcement may  be limited  by  bankruptcy, insolvency  or other  similar  laws
affecting  the enforcement  of creditors' rights  generally and  except that the
availability of equitable remedies,  including specific performance, is  subject
to  the discretion  of the  court before  which any  proceeding therefor  may be
brought.
 
    5.4.4  Except  for the  approval of  the holders  of Shares  as provided  in
Section 9.1.1, the Company is not subject to or obligated under (i) any charter,
by-law,  indenture or other loan document  provision or (ii) any other Contract,
Permit, Order, lease,  instrument, statute, law,  ordinance, rule or  regulation
applicable to the Company or its properties or assets which would be breached or
violated,  or under which  there would be  a default (with  or without notice or
lapse of  time,  or  both),  or  under  which  there  would  arise  a  right  of
termination,  cancellation or  acceleration of any  obligation or the  loss of a
material benefit, by its executing and carrying out this Agreement.
 
    5.4.5  Except in  connection, or in compliance,  with the provisions of  the
Securities  Act, the Exchange  Act, and the corporation,  securities or blue sky
laws or  regulations  of the  various  states,  no Permit  or  Authorization  is
necessary  for  the consummation  by  the Company  of  the Merger  or  the other
transactions contemplated hereby.
 
5.5  COMPANY ACTION
 
    The Board of Directors of the Company (at a meeting duly called and held  or
pursuant  to a unanimous written consent to action) has by the requisite vote of
all directors present  (i) determined that  the Merger is  advisable and in  the
best  interests of the Company and its shareholders, (ii) approved the Merger in
accordance with  the provisions  of  Section 180.1103  of  the WBCL,  and  (iii)
recommended  the approval of this Agreement and the Merger by the holders of the
Shares and  directed that  the  Merger be  submitted  for consideration  by  the
Company's shareholders at the Company Shareholders Meeting.
 
5.6  FINANCIAL STATEMENTS
 
    5.6.1   The Company has previously furnished Protocol with true and complete
copies of its (i) audited balance sheets as of December 31, 1993 and 1994,  (ii)
related  audited statements of  income, stockholders' equity  and cash flows for
the periods ending December 31, 1993 and 1994 (including all audit opinions  and
all  notes accompanying such  statements), (iii) unaudited  balance sheets as of
December 31, 1995 and January 31, 1996, and (iv) unaudited statements of  income
and cash flows for the year-ended December 31, 1995 and month ending January 31,
1996.  All such balance  sheets and statements  covered by (i)  through (iv) are
collectively  referred  to   in  this  Agreement   as  the  "Company   Financial
Statements."
 
    5.6.2  The Company Financial Statements are in accordance with the books and
records  of  the  Company and  fairly  present,  in all  material  respects, the
financial position, results of  operations and cash flows  of the Company as  of
the  dates and for the  periods indicated, in each  case in conformity with GAAP
consistently  applied,  except  (i)  as  otherwise  indicated  in  such  Company
Financial  Statements  and,  (ii) in  the  case of  unaudited  Company Financial
Statements, subject to normal year-end adjustments, the absence of footnotes and
other disclosures  associated  with  an  audited  report.  The  audited  Company
Financial  Statements provide  fully for  all material  fixed and non-contingent
liabilities of  the Company  and  disclose or  provide  fully for  all  material
contingent  liabilities of a  type required to  be disclosed or  provided for in
financial statements in accordance with GAAP.
 
                                      A-11
<PAGE>
    5.6.3  To the Company's Knowledge, the Company does not have any liabilities
or obligations (absolute, accrued, contingent or otherwise), which are  material
to  the  Company and  which are  not disclosed  or provided  for in  the Company
Financial Statements, other  than liabilities and  obligations incurred  between
January  31, 1996 and the date hereof in  the ordinary course of the business of
the Company, consistent with past practice and except as otherwise disclosed  in
this  Agreement,  including the  Company Disclosure  Schedule. To  the Company's
Knowledge, there is no basis for any such liability against the Company, whether
absolute, accrued, contingent  or otherwise, which  is or would  have a  Company
Material Adverse Effect, not reflected in the Company Financial Statements.
 
5.7  ABSENCE OF CERTAIN CHANGES OR EVENTS
 
    Since December 31, 1995, there has not been:
 
    5.7.1   any  material adverse change  in the  business, financial condition,
liabilities (net of any corresponding increase in assets), results of operations
or, to the Company's Knowledge, prospects  of the Company other than changes  in
laws or regulations of general applicability;
 
    5.7.2  any damage, destruction or loss, whether covered by insurance or not,
materially   and  adversely   affecting  the   financial  condition,  prospects,
properties or businesses of the Company;
 
    5.7.3  any declaration, payment or setting aside for payment of any dividend
or other distribution (whether in cash,  stock or property) with respect to  the
capital  stock of the Company or any  direct or indirect redemption, purchase or
other acquisition of any shares of capital stock of the Company;
 
    5.7.4  any increase in the compensation of or granting of bonuses payable or
to become  payable  by  the  Company  to any  officer  or  employee  whose  1995
calendar-year  compensation  (salary plus  bonus)  exceeded $50,000,  other than
annual increases  or bonuses  consistent with  the Company's  past practices  or
pursuant  to  the  terms  and  provisions  of  the  Employee  Contracts  and not
exceeding, for any such officer or employee, ten percent (10%) of such officer's
or employee's 1995 calendar-year compensation;
 
    5.7.5  any  sale or  transfer by  the Company  of any  material tangible  or
intangible  asset, any lease of real  property or equipment, or any cancellation
of any debt or claim, except in the ordinary course of business;
 
    5.7.6   any material  change  in accounting  methods  or principles  or  any
revaluation  of any of its assets  (including, without limitation, any change in
depreciation or amortization policies or rates);
 
    5.7.7  any amendment or termination  of any contract, agreement, or  license
to which the Company is a party, except in the ordinary course of business;
 
    5.7.8   any loan by the Company to  any Person or guaranty by the Company of
any loan;
 
    5.7.9  any waiver or release of any material right or claim of the  Company,
except in the ordinary course of business;
 
    5.7.10  any commencement or notice or, to the Company's Knowledge, threat of
commencement  of any civil litigation or  any governmental proceeding against or
investigation of the Company or the affairs; or
 
    5.7.11  to the Company's Knowledge,  any labor trouble or claim of  wrongful
discharge or other unlawful labor practice or action.
 
5.8  LITIGATION
 
    There  is no Proceeding  pending or, to  the Company's Knowledge, threatened
against the Company which, either alone or in the aggregate, could reasonably be
expected to  have a  Company Material  Adverse Effect,  nor is  there any  Order
outstanding  against the Company having, or which in the future could reasonably
be expected to  have, either  alone or in  the aggregate,  any Company  Material
Adverse Effect.
 
                                      A-12
<PAGE>
5.9  TAXES
 
    5.9.1  The Company has duly filed all Tax Returns required to be filed since
the Company's date of incorporation with any Governmental Authority and all such
Tax Returns were correct and complete in all material respects.
 
    5.9.2   The Company  has paid in full  all Taxes required to  be paid by the
Company for periods occurring since  the Company's date of incorporation  before
such  payment  became  delinquent  and  no deficiencies  have  been  or,  to the
knowledge of the  Company, will be  assessed with respect  thereto for any  such
period through December 31, 1995.
 
    5.9.3   All Taxes which the Company has been required to collect or withhold
since the Company's date of incorporation  have been duly collected or  withheld
and,  to the extent  required when due,  have been or  will be duly  paid to the
proper Governmental Authority.
 
    5.9.4   The  Tax Returns  of  the Company  have  not been  examined  by  any
Governmental Authority for any period since the Company's date of incorporation,
there  are no  audits known by  the Company to  be pending of  the Company's Tax
Returns, and there are no claims which have been or, to the Company's Knowledge,
or may be  asserted relating to  the Company's  Tax Returns filed  for any  year
since the Company's date of incorporation.
 
    5.9.5   The Company is  not a party to  any tax-sharing agreement or similar
arrangement with any other party.
 
    5.9.6  There are no federal, state,  local or foreign tax liens upon any  of
the  properties or assets of the Company and there are no unpaid Taxes which are
or could become a Lien  on the properties or assets  of the Company, except  for
current Taxes not yet due and payable.
 
    5.9.7   There have been no waivers of statutes of limitations by the Company
with  respect  to  any  Governmental  Authority  responsible  for  assessing  or
collecting Taxes.
 
    5.9.8   Correct and complete copies of  all Tax Returns of the Company since
the Company's  date of  incorporation requested  by Protocol  or any  Authorized
Representative have been, or will be, provided to Protocol.
 
    5.9.9   The Company has  not agreed or been  required to make any adjustment
under Section 481(a) of the Code by  reason of a change in accounting method  or
otherwise,  except for  adjustments under Section  481(a) which  have been fully
recognized on or before the Closing Date.
 
    5.9.10  For the  purpose of this Agreement,  any income, excise,  franchise,
sales,  use, transfer, payroll,  personal property, real  property, occupancy or
other tax, levy, impost, fee, imposition, assessment or similar charge, together
with  any  related  addition  to  tax,  interest  or  penalty  thereon,  of  any
Governmental  Authority,  is  referred  to  as a  "Tax."  For  purposes  of this
Agreement, "Tax Return" refers to  any type of return  or report required to  be
filed  as a result of any Tax and any return or informational report required to
be filed under  the Internal  Revenue Code including,  but not  limited to,  IRS
forms 941, 1099 and 5500.
 
5.10  COMPLIANCE WITH PERMITS, APPLICABLE LAWS AND AGREEMENTS
 
    5.10.1    To the  Company's Knowledge,  the Company  holds all  Permits, the
failure of  which to  hold would  have a  Company Material  Adverse Effect  (the
"Company  Permits"). To  the Company's Knowledge,  the Company  is in compliance
with the terms of the Company Permits, except for such failures to comply which,
individually or in  the aggregate,  would not  have a  Company Material  Adverse
Effect.
 
    5.10.2  To the Company's Knowledge, the business of the Company is not being
conducted  in violation of any law,  ordinance or regulation of any Governmental
Authority, except for possible violations which individually or in the aggregate
do not and would not have a Company Material Adverse Effect.
 
                                      A-13
<PAGE>
    5.10.3  To the Company's Knowledge, the  Company is not in default (and  not
in a circumstance which, with notice or lapse of time, or both, would constitute
a  default) under any agreement or instrument to which it is a party, whether or
not such default has been waived, except for any such default which, alone or in
the aggregate  with other  such  defaults, would  not  have a  Company  Material
Adverse Effect.
 
    5.10.4    The provisions  of this  Section  5.10 shall  not be  construed or
applied to narrow or otherwise restrict  the scope of any other  representations
and warranties in this Article 5.
 
5.11  EMPLOYEE PLANS AND BENEFIT ARRANGEMENTS
 
    5.11.1   Section 5.11 of the Company  Disclosure Statement sets forth a true
and complete list  of all the  following: (i) each  "employee benefit plan,"  as
such  term is defined in Section 3(3)  of ERISA (each, together with the Company
Option Plan, an  "Employee Plan"), and  (ii) each other  plan, program,  policy,
contract  or arrangement providing for bonuses, pensions, deferred compensation,
stock or stock-related  awards, severance  pay, salary  continuation or  similar
benefits,   hospitalization,  medical,  dental   or  disability  benefits,  life
insurance or other employee benefits, or  compensation to or for any current  or
former officers, directors, employees, agents, or independent contractors of the
Company  ("Employees")  or  any  beneficiaries or  dependents  of  any Employee,
whether or not  insured or funded,  (A) pursuant  to which the  Company has  any
material  liability or (B) constituting an  employment or severance agreement or
arrangement with  any officer  or  director of  the  Company (each,  a  "Benefit
Arrangement").  The  Company  has  used its  reasonable  efforts  to  provide to
Protocol with respect to each Employee Plan and Benefit Arrangement: (i) a  true
and  complete copy  of all  written documents,  including amendments, comprising
such Employee  Plan or  Benefit Arrangement  or,  if there  is no  such  written
document,  an accurate and complete description of such Employee Plan or Benefit
Arrangement; (ii)  All  Form 5500s  or  Form 5500-Cs  (including  all  schedules
thereto),  if  applicable;  (iii)  the  most  recent  financial  statements  and
actuarial reports, if any; (iv) the summary plan description currently in effect
and all material modifications thereof, if any; and (v) the most recent Internal
Revenue Service  determination  letter,  if  any;  and  (vi)  filings  with  the
Department  of  Labor,  including, but  not  necessarily limited  to,  "top hat"
filings pursuant to Department of Labor Regulation Section 2520.104-23, if  any.
Any  such Employee Plans and Benefit Arrangements not so provided are not in the
aggregate material to the Company.
 
    5.11.2   (i) The  Company has  established and  maintained in  all  material
respects each Employee Plan and Benefit Arrangement in accordance with its terms
and  in material compliance with all applicable laws, including, but not limited
to, ERISA and the  Code; and (ii)  to the Company's  Knowledge, any third  party
trustee  has  complied  in all  material  respects  in the  maintenance  of each
Employee Plan and Benefit Arrangement with all applicable laws and requirements.
Neither the Company nor any of its Employees, nor, to the best knowledge of  the
Company,  any other disqualified Person or party-in-interest with respect to any
Employee  Plan,  have  engaged  directly   or  indirectly  in  any   "prohibited
transaction," as such term is defined in Section 4975 of the Code or Section 406
of  ERISA, with  respect to  which the  Company could  have or  has any material
liability.
 
    5.11.3  The  Company has no  Employee Plan that  is subject to  Title IV  of
ERISA  and  has had  no  ERISA Affiliate  at  any time  since  the later  of the
Company's incorporation or September 2, 1974.
 
    5.11.4  There  are no  pending or,  to the  Company's Knowledge,  threatened
Proceedings  by any Employees or plan participants or the beneficiaries, spouses
or representatives  of  any  of  them, against  any  Employee  Plan  or  Benefit
Arrangement,  the assets held thereunder, the trustee of any such assets, or the
Company relating to  any of the  Employee Plans, other  than ordinary and  usual
claims  for benefits by participants or beneficiaries. Furthermore, there are no
pending,  or  to  the  Company's   Knowledge,  threatened  Proceedings  by   any
Governmental  Authority of or against any  Employee Plan or Benefit Arrangement,
the trustee of any assets held thereunder, or the Company relating to any of the
Employee Plans or Benefit Arrangements.
 
                                      A-14
<PAGE>
    5.11.5  No Employee  Plan has been  the subject of an  IRS or Department  of
Labor  audit. There are  no pending Proceedings or,  to the Company's Knowledge,
threatened Proceedings in which the "qualified"  status of any Employee Plan  is
at  issue  and  in  which  revocation  of  the  determination  letter  has  been
threatened. Each such Employee Plan has not been amended or operated, since  the
receipt  of  the  most  recent  determination letter,  in  a  manner  that would
materially adversely  affect the  "qualified" status  of the  Employee Plan.  No
distributions  have been made from any of  the Employee Plans that would violate
in  any   material  respect   the  restrictions   under  Treas.   Reg.   Section
1.401(a)(4)-5(b),  and none will  have been made  by the Effective  Time. To the
Company's Knowledge, there  has been  no termination, partial  or otherwise,  as
defined  in Section 411(d)  of the Code  and the regulations  thereunder, of any
Employee Plan.
 
    5.11.6  The Company has made all required contributions under each  Employee
Plan on a timely basis or, if not yet due, adequate accruals therefore have been
provided for in the Company Financial Statements.
 
    5.11.7   Except  for the  acceleration of  Existing Options  pursuant to the
Company Option Plan, neither the execution or delivery of this Agreement nor the
consummation of the transactions contemplated  hereby (either alone or  together
with  any  additional  or  subsequent events)  constitutes  an  event  under any
Employee Plan,  Benefit  Arrangement or  loan  to, or  individual  agreement  or
contract  with, an Employee that may result in any payment (whether of severance
pay or otherwise),  restriction or limitation  upon the assets  of any  Employee
Plan  or  Benefit Agreement,  acceleration of  payment  or vesting,  increase in
benefits or compensation, or required funding, with respect to any Employee,  or
the forgiveness of any loan or other commitment of any Employees.
 
    5.11.8    To the  Company's Knowledge,  no  amounts paid  or payable  by the
Company to  or with  respect to  any Employee  will fail  to be  deductible  for
federal income tax purposes by reason of Section 280G of the Code.
 
    5.11.9   No Employees and no beneficiaries or dependents of Employees are or
may  become  entitled  under  any  Employee  Plan  or  Benefit  Arrangement   to
post-employment  welfare benefits  of any  kind, including,  without limitation,
death or medical benefits, other than coverage mandated by Section 4980B of  the
Code.
 
    5.11.10   The Employee Plans that are group health plans (as defined for the
purposes of Section 4980B  of the Code and  Part 6 of Subtitle  B of Title I  of
ERISA,  and all regulations thereunder, (such  provisions of law and regulations
are hereinafter referred to as "COBRA")) have complied in all material  respects
at all times during the past three (3) years, and will continue to comply in all
material  respects through  the Effective  Time, with  requirements of  COBRA to
provide health care  continuation coverage to  qualified beneficiaries who  have
elected,  or may  elect to have,  such coverage.  The Company or  its agents who
administer any of the Employee Plans  or Benefit Arrangements, have complied  in
all  material respects  at all times  during the  past three (3)  years and will
continue to comply in all material respects through the Effective Time, with the
notification and written notice requirements of  COBRA. There are no pending  or
to  the  Company's Knowledge,  threatened Proceedings  by any  current Employee,
former Employee, participants or by the beneficiary, dependent or representative
of any  such person,  involving the  failure  of any  Employee Plan  or  Benefit
Arrangement  or of any other group health plan ever maintained by the Company to
comply with the health care continuation coverage requirements of COBRA.
 
    5.11.11  There are no agreements with, or pending petitions for  recognition
of, a labor union or an association as the exclusive bargaining agent for any of
the  Employees of the Company;  no such petitions have  been pending at any time
within two years of the date of this Agreement, and, to the Company's Knowledge,
there has not been any organizing effort by any union or other group seeking  to
represent  any Employees of  the Company as their  exclusive bargaining agent at
any time within  two years of  the date of  this Agreement. There  are no  labor
strikes,  work stoppages or,  to the Company's  Knowledge, other labor troubles,
other than routine grievance  matters, now pending,  or threatened, against  the
Company.
 
                                      A-15
<PAGE>
5.12  EMPLOYEE CONTRACTS AND NON-DISCLOSURE AGREEMENTS
 
    The  Company has provided Protocol with copies of all Employee Contracts for
its current Employees. All of the  Company's current salaried Employees who  are
considered  appropriate by the  Company and, to the  Company's Knowledge, all of
its former Employees who  were considered appropriate at  the time and who  have
terminated  employment since February 20,  1995, have executed a confidentiality
agreement substantially in  the form set  forth in Section  5.12 of the  Company
Disclosure  Schedules.  All of  the Employees  are  "at-will" employees,  and no
Employees have oral or written employment agreements with the Company.
 
5.13  REAL PROPERTY
 
    5.13.1  Section  5.13 of the  Company Disclosure Schedule  contains a  true,
complete  and correct list  of the Real  Property. (i) The  Company owns no Real
Property, (ii) the  Company enjoys  peaceful and undisturbed  possession of  the
Real  Property  leased by  the Company,  (iii) to  the Company's  Knowledge, the
Company's interest in  the Real Property  is not subject  to any commitment  for
sale or use by any Person other than the Company, (iv) the Company's interest in
the Real Property is not subject to any Lien (other than the Lien of the owner's
mortgagee,  if any) which in any material respect interferes with or impairs the
value, transferability or  present and continued  use thereof in  the usual  and
normal  conduct of the  Company's business, (v)  no labor has  been performed or
material furnished on behalf of  or at the request of  the Company for the  Real
Property  for which a  mechanic's or materialman's  lien or liens,  or any other
lien, has been or could  be claimed by any Person  on the Company's interest  in
the  Real Property, (vi) the Company's use of the Real Property presently leased
by the Company  is in compliance  in all material  respects with all  applicable
zoning  laws, and (vii) to the  Company's Knowledge, the Real Property presently
leased by  the Company,  is in  compliance  in all  material respects  with  all
applicable building code and other laws (other than zoning laws).
 
    5.13.2   To  the Company's Knowledge,  there are no  condemnation or eminent
domain Proceedings  pending  or contemplated  or  threatened, against  the  Real
Property  presently leased by the  Company or any part  thereof, and the Company
has no knowledge of any desire of any Governmental Authority to take or use  the
Real  Property or  any part  thereof. To the  Company's Knowledge,  there are no
existing  or,  contemplated  or  threatened,  general  or  special   assessments
affecting  the Company's interest  in the Real Property  presently leased by the
Company or  any portion  thereof. The  Company has  not received  notice of  any
pending or threatened Proceeding before any Governmental Authority which relates
to the ownership, maintenance, use or operation of the Company's interest in the
Real Property presently leased by the Company.
 
    5.13.3   The  buildings and  improvements on  the Real  Property (including,
without limitation, the  heating, air conditioning,  mechanical, electrical  and
other  systems used in connection therewith)  are in a condition deemed adequate
by the  Company for  the  intended use,  ordinary  wear, tear  and  obsolescence
excepted  and to the Company's Knowledge are reasonably free from infestation by
termites, other wood destroying  insects, vermin and other  pests. There are  no
repairs or replacements exceeding $50,000 in the aggregate for all Real Property
presently  leased by the Company or $10,000 for any single repair or replacement
which are  currently contemplated  by the  Company or  which, in  the  Company's
reasonable  judgment, should  be made  in order  to maintain  said buildings and
improvements in a reasonable state of repair.
 
5.14  TANGIBLE PERSONAL PROPERTY
 
    5.14.1  Section 5.14 of the  Company Disclosure Schedule lists each item  of
Tangible Personal Property owned by the Company having an original book value in
excess of $5,000, and Section 5.14 of the Company Disclosure Schedule lists each
item  of Tangible Personal Property leased by the Company (other than individual
leases of office equipment having an annual rental of less than $5,000).
 
                                      A-16
<PAGE>
    5.14.2    The  Tangible  Personal  Property  constitutes  substantially  all
tangible  personal property necessary, in  the Company's reasonable judgment, to
conduct the business of the Company as presently conducted. All of the  Tangible
Personal  Property is  located at  the Real  Property and  there is  no Tangible
Personal Property located  at any of  the Real  Property which is  not owned  or
leased by the Company.
 
    5.14.3  In the Company's reasonable judgment, the Tangible Personal Property
is,  in all  material respects,  in a condition  adequate for  its intended use,
ordinary wear  and tear  and  obsolescence excepted.  There  are no  repairs  or
replacements  exceeding  $50,000  in  the aggregate  for  all  Tangible Personal
Property or $10,000 for any single item of Tangible Personal Property which  are
currently  contemplated by  the Company  or which,  in the  Company's reasonable
judgment, should be made in order to maintain the Tangible Personal Property  in
reasonable working order.
 
5.15  INTANGIBLE PROPERTY
 
    5.15.1   Section  5.15 of the  Company Disclosure Schedule  contains a true,
correct and  complete list  of: (i)  United States  federal, state  and  foreign
grants,  registrations and applications existing  or outstanding with respect to
any Intangible Property owned by the Company, including, without limitation, all
applicable grants, registration, application or serial numbers and other  filing
or  recording  information  and  all expiration  dates  pertaining  thereto (the
"Registered Intangible  Property");  (ii)  all license  agreements  relating  to
Intangible  Property  to which  the  Company is  a  party; and  (iii)  all other
trademarks, tradenames and service marks which constitute Intangible Property.
 
    5.15.2  (i) The Registered Intangible  Property is owned exclusively by  the
Company  and,  to the  knowledge  of the  Company,  is used  exclusively  by the
Company, (ii) the Registered  Intangible Property owned by  the Company is  free
and  clear  of  all  Liens, (iii)  there  is  no pending  or,  to  the Company's
Knowledge,  threatened  Proceeding  by  or  before  any  Governmental  Authority
alleging,  any infringement or other violation of  any right of any third Person
in or to the Intangible Property, (iv) there is not now, and there has not  been
during  the  past  five  years,  any asserted  claim  of  infringement  or other
violation of any other intellectual property right of any third Person resulting
from the conduct of the Company, and the Company has no Knowledge that any  such
infringement  or violation  exists or  will be alleged,  (v) the  Company has no
Knowledge of any activity by any third Person which does or might constitute  an
infringement  or other violation of the Company's rights in or to any Intangible
Property,  (vi)  the  Company  has  not  entered  into  any  license,   consent,
indemnification,  forbearance  to sue,  settlement agreement  or cross-licensing
arrangement  with  any  Person  relating  to  the  Intangible  Property  or  any
intellectual  property right of any third  Person, (vii) there are no agreements
relating to and materially affecting any  Intangible Property of the Company  or
the use or ownership thereof, including, without limitation, license agreements,
confidentiality  and  non-disclosure  agreements, assignments  or  agreements to
assign,  development  agreements,  settlement   agreements  and  other   related
agreements;  and (viii) the Company is unaware of any information which would or
might materially adversely affect any of  the Intangible Property or render  any
of the Intangible Property invalid or unenforceable.
 
    5.15.3    The  Intangible  Property  identified  in  the  Company Disclosure
Schedule constitutes,  in  the  Company's reasonable  judgment,  all  Intangible
Property  necessary  and  sufficient  to  operate  the  Company's  business. The
consummation of the transactions contemplated hereby will not result in the loss
or impairment of  any of  the Company's rights  in the  Intangible Property.  No
shareholder or Employee of the Company owns, directly or indirectly, in whole or
in part, any rights in any of the Intangible Property. The Company has the right
to  use its corporate  name and, each  tradename or assumed  name under which it
conducts its  business.  No  Person has  asserted  to  the Company  or,  to  the
Company's  Knowledge, threatened to assert to the Company, any claim or made any
demand to the right  to the Company's  corporate name or  any such tradename  or
assumed  name or the right to use any such name, and no Proceeding is pending or
threatened, which challenges the right of  the Company with respect thereto.  To
the  Company's Knowledge, no other Person is using any such names as a corporate
name, tradename or assumed name.
 
                                      A-17
<PAGE>
5.16  TITLE TO ASSETS
 
    The  Company has good and marketable title to all of its assets as described
in the most recent balance sheet  contained in the Company Financial  Statements
and  in  Sections 5.13,  5.14, 5.15,  5.17  and 5.18  of the  Company Disclosure
Schedule, free and clear of all Liens.
 
5.17  INVENTORIES AND RECEIVABLES
 
    5.17.1  The inventories of the Company at December 31, 1995 are shown on the
balance sheet at December 31, 1995 referred to in Section 5.6. Such  inventories
and  the inventories  acquired by  the Company  subsequent to  the date  of such
balance sheet  consist of  items of  a  quality and  quantity, in  all  material
respects,  usable and salable in the normal course of its business over a period
of one  year from  the date  of  this Agreement,  subject to  recorded  reserves
reflected  on the Company Financial Statements. The values of obsolete materials
and materials below  standard quality  have been written  down on  its books  of
account  to realizable  market value,  or adequate  reserves have  been provided
therefor in accordance  with GAAP. All  items included in  such inventories  are
owned  by the  Company, except  for sales  made subsequent  to the  date of such
balance sheet in the ordinary  course of business, for  all of which either  the
purchaser  has made full payment  or the purchaser is  obligated to make payment
and such obligation  is an asset  of the  Company in accordance  with GAAP.  All
inventories  of raw materials and finished goods are carried on the December 31,
1995 balance sheet referred to  in Section 5.6 and are  carried on the books  at
the lower of cost (first in-first out) or market.
 
    5.17.2    All receivables  of  the Company  shown  on the  balance  sheet at
December 31, 1995, referred to  in Section 5.6 arose  in the ordinary course  of
business  at  the aggregate  amounts thereof  are,  to the  Company's Knowledge,
collectible at  the net  recorded  amount thereof,  and  are carried  at  values
determined  in  accordance  with  GAAP  consistently  applied.  The  Company has
established reserves for doubtful  accounts in accordance with  GAAP and to  the
extent reflected in the Company Financial Statements. None of the receivables of
the  Company is  subject to  any stated claim  of offset,  recoupment, setoff or
counterclaim and the Company has no knowledge of any facts or circumstances that
would give  rise to  any such  claim.  No receivables  are contingent  upon  the
performance by the Company of any obligation or contract. No Person has any Lien
on  any of such receivables, and no agreement for deduction or discount has been
made with respect to any of such receivables.
 
5.18  CONTRACTS
 
    5.18.1  Schedule 5.18 of the Company Disclosure Schedule contains a true and
correct list of the Contracts. True and  correct copies of all of the  Contracts
have  been delivered to  Protocol. Each of  the Contracts is  valid, binding and
enforceable by the Company in accordance  with its terms. Each of the  Contracts
was  entered  into in  the ordinary  course of  business and  is not  subject to
termination except  in  accordance with  its  terms  or except  as  provided  by
applicable law.
 
    5.18.2   To the Company's Knowledge, each  of the Contracts is in full force
and effect, all  fees, rents, royalties  and other payments  due thereunder  are
current,  neither  the  Company  nor  any other  party  is  in  material default
thereunder or in  material breach thereof,  and the Company  has not during  the
past  five years sought or obtained any waiver  of or under any provision of any
Contract (including, without  limitation, any  waiver from any  lender or  other
creditor  of any  term, condition  or default  under any  Contract), (other than
waivers obtained which have no  continuing Company Material Adverse Effect).  To
the  Company's Knowledge, there exists no  event or occurrence, condition or act
which constitutes  or, with  the giving  of notice,  the lapse  of time  or  the
happening  of any future event or condition, would become, a material default by
the Company or any other  party under any of the  Contracts. The Company has  no
Knowledge of any threatened default under any of the Contracts.
 
    5.18.3  The Company is not a party to any Contract:(i) which was not entered
into in the ordinary course of business; (ii) which requires the Company to make
any  capital expenditure  in excess  of $25,000;  or (iii)  which has  a term of
greater than one year (other than Contracts which are cancelable without penalty
in sixty (60) days or less).
 
                                      A-18
<PAGE>
5.19  SUPPLIERS AND CUSTOMERS
 
    To the  Company's  Knowledge,  no  substantial  supplier  or  customer  (who
accounted for more than 2% of aggregate 1995 annual purchases or more than 2% of
aggregate  1995  annual  revenues, as  the  case  may be,  of  the  Company) has
indicated to the Company that it intends to terminate its relationship with  the
Company;  nor does the Company have Knowledge that any such supplier or customer
intends to terminate such relationship or  that any material problem or  dispute
with  any such supplier or  customer exists. In the  opinion of the Company, the
Company has good business  relationships with each  such supplier and  customer.
The Company has received no information from any Person that the consummation of
the  Merger would or might disrupt the Company's existing relationships with any
such supplier or customer,  but Protocol recognizes that  the Persons listed  in
Section  5.19 of  the Company Disclosure  Schedule are  competitors or potential
competitors of Protocol and, consequently, may threaten to curtail, terminate or
adversely modify, or may  in fact curtail, terminate  or modify, their  business
with   the  Company  as  a  result  of  the  consummation  of  the  transactions
contemplated hereby. In the event of any such threatened or actual  curtailment,
termination or modification, notwithstanding any representation other than those
contained above in this Section 5.19 and notwithstanding any agreement, covenant
or condition (including, without limitation, Sections 10.2.7 and 10.2.8) in this
Agreement to the contrary, Protocol acknowledges that it will (i) not assert any
such  event or the  financial consequences thereof as  a condition to Protocol's
obligation to consummate the  transactions contemplated hereby  or (ii) have  no
claim for breach of representation or warranty, indemnification or otherwise for
any damages or loss of any kind sustained or suffered by Protocol or the Company
as  a  result  of any  such  curtailment,  termination or  modification  of such
business with such customers.
 
5.20  PRODUCTS; PRODUCT WARRANTIES
 
    5.20.1  A form of each product warranty relating to products manufactured or
sold by  the Company  (other than  products manufactured  and sold  to  original
equipment  manufacturers for which  negotiated product warranties  may have been
given) at  any time  during the  five-year  period preceding  the date  of  this
Agreement  is  attached  to  or  set forth  on  Section  5.20.1  of  the Company
Disclosure Schedule.
 
    5.20.2  Section 5.20.2 of the Company Disclosure Schedule sets forth a  true
and  complete list, of  (i) all products  manufactured, marketed or  sold by the
Company that have been recalled or withdrawn (whether voluntarily or  otherwise)
at  any time during the  past five (5) years (for  purposes of this paragraph, a
product shall have been recalled or withdrawn if all or a significant number  of
products in a product line were recalled or withdrawn) and (ii) to the Company's
Knowledge, all Proceedings (whether completed or pending) at any time during the
past five (5) years seeking the recall, withdrawal, suspension or seizure of any
product sold by the Company.
 
    5.20.3   Except  as set  forth on Section  5.20.3 of  the Company Disclosure
Schedule, the  Company  has no  Knowledge  of  any material  defect  in  design,
materials, manufacture or otherwise in any products manufactured, distributed or
sold  by the Company during the past five  (5) years or any defect in repair to,
or replacement  of, any  such products  which  could give  rise to  any  Company
Material Adverse Effect.
 
    5.20.4   The  average annual  cost of  all product  repairs and replacements
performed by the Company during the past five (5) years did not exceed $500,000.
 
    5.20.5   Except  as provided  in  any  of the  standard  product  warranties
described  in paragraph  5.20.1 of  this Section, the  Company has  not sold any
products or services which  are subject to an  extended warranty of the  Company
beyond 18 months and which warranty has not yet expired.
 
5.21  ENVIRONMENTAL MATTERS
 
    5.21.1   To the Company's Knowledge, the Company, and its assets, properties
and operations are now and, at all times prior to the date hereof, have been  in
compliance  in all material respects with  all applicable Environmental Laws. To
the   Company's   Knowledge,   there   has   been   and   is   no   Release   or
 
                                      A-19
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threatened  Release of any Environmental Material at,  on, under, in, to or from
any of the Real Property occupied by the Company which relates to the  Company's
operations and activities at the Real Property. The Company has not received any
notice  of alleged,  actual or potential  responsibility for,  or any Proceeding
regarding, the  presence, Release  or threatened  Release of  any  Environmental
Material  at  any location,  whether at  the Real  Property or  otherwise, which
Environmental Materials were allegedly manufactured, used, generated, processed,
treated, stored, disposed or otherwise handled  at or transported from the  Real
Property occupied by the Company.
 
    5.21.2   The Company has not received  any notice of any other Proceeding by
any Person alleging  any actual or  threatened injury or  damage to any  Person,
property,  natural resource or  the environment arising from  or relating to the
presence, Release or threatened Release  of any Environmental Materials at,  on,
under,  in, to or from the Real Property or in connection with any operations or
activities thereat. To the  Company's Knowledge, neither  the Real Property  nor
any  operations or activities thereat is or  has been subject to any judicial or
administrative proceeding, order, consent, agreement or any lien relating to any
applicable Environmental Laws.
 
    5.21.3  To the Company's Knowledge,  there are no underground storage  tanks
presently  located at the Real  Property and there have  been no Releases of any
Environmental Materials from any underground storage tanks or related piping  at
the Real Property occupied by the Company. To the Company's Knowledge, there are
no   PCBs  located   at,  on   or  in  the   Real  Property,   nor  asbestos  or
asbestos-containing material located at, on or in the Real Property.
 
5.22  TRANSACTIONS WITH CERTAIN PERSONS
 
    Except as disclosed in  this Agreement, to the  Company's Knowledge, (i)  no
Relevant Company Insider, nor any Person related to any Relevant Company Insider
by blood or marriage, nor any corporation, partnership, trust or other entity in
which  any such  Person has  a substantial  interest as  a shareholder, officer,
director, trustee,  partner  or  otherwise,  or any  Affiliate  of  any  of  the
foregoing  (each, a "Related  Person"), is presently  or at any  time during the
past five years has been a party to any material transaction (other than  normal
compensation  arrangements for  Employees) with the  Company, including, without
limitation, any contact, agreement  or other arrangement  (A) providing for  the
furnishing  of material services to or by,  (B) providing for the rental or sale
of real or personal property to or from, or (C) otherwise requiring payments  of
an  amount in  excess of $500  annually to or  from (other than  for services as
Employees) such Related Person and (ii)  no Relevant Company Insider is  related
to  any  other  Relevant Company  Insider  by  blood or  marriage.  There  is no
outstanding amount  in  excess of  $500  owing (including,  without  limitation,
pursuant to any advance, note or other indebtedness instrument) from the Company
to  any Related  Person or from  any Related  Person to the  Company, other than
three Promissory  Notes, each  dated July  1, 1995  in the  principal amount  of
$75,429, payable to each of Daniel F. Carsten, Robert H. Ricciardelli and Robert
M.  Sommer  (the  "Shareholder  Notes  Payable").  Each  of  the  Related Person
transactions set forth in  Section 5.22 of the  Company Disclosure Schedule,  if
any,  was entered  into between the  Company and  the Related Person  on an arms
length basis on terms no  less favorable to the  Company than could be  obtained
from an unrelated third party.
 
5.23  ABSENCE OF CERTAIN PAYMENTS
 
    To  the Company's Knowledge, neither the Company nor any of its Employees or
other Persons acting on behalf  of any of them, or  any Affiliate of any of  the
foregoing,  have  with respect  to  the Company's  business  (i) engaged  in any
activity, prohibited by the United States Foreign Corrupt Practices Act of  1977
or  any other similar law, regulation or  Order of any Governmental Authority or
(ii) without  limiting the  generality of  the preceding  clause (i),  used  any
corporate  or  other  funds  for  unlawful  contributions,  payments,  gifts  or
entertainment, or made any unlawful expenditures relating to political  activity
to  officials of any Governmental Authority. To the Company's Knowledge, none of
the Company or  any of its  shareholders, Employees or  other Persons acting  on
behalf of any of them, or any Affiliate of any of the foregoing, has accepted or
received any unlawful contributions, payments, gifts or expenditures.
 
                                      A-20
<PAGE>
5.24  RECORDS
 
    5.24.1   To the Company's  Knowledge, no Business Records  for the past five
years relating to the Company have been destroyed and all such Business  Records
are  available  upon  request,  subject to  applicable  laws  and/or contractual
prohibitions or  limitations.  In  addition,  to  the  Company's  Knowledge,  no
Business  Records relating to  periods prior to such  five-year period which the
Company is  required  to  maintain  (including,  without  limitation,  personnel
records and information relevant to current or future tax filings) have not been
destroyed  and all such Business Records  are available upon request, subject to
applicable laws and/or contractual prohibitions or limitations.
 
    5.24.2  Complete and correct copies of the Corporate Records of the  Company
have  been delivered to Protocol as part of the Company Disclosure Schedule. The
minutes of the Company contain a complete and accurate record of those  meetings
and  significant actions  of shareholders  and directors,  and of  any executive
committee or other  committee of  the shareholders  or board  of directors,  for
which  minutes were  prepared or  for which  actions were  approved by unanimous
written consent and for which  no meetings were held.  The stock records of  the
Company are complete and accurate and contains a complete and accurate record of
all share transactions for the Company from the date of its incorporation.
 
5.25  INSURANCE
 
    5.25.1   Section 5.25 of the Company Disclosure Schedule contains a complete
and accurate  list of  (i) all  current  policies or  binders of  fire,  product
liability,  automobile liability,  general liability,  worker's compensation and
other forms  of insurance  (showing as  to each  policy or  binder the  carrier,
policy  number, coverage limits, expiration dates, annual premiums, deductibles,
whether coverage is "occurrence" or "claims  made" and a general description  of
the  type of coverage provided and  policy exclusions) maintained by the Company
and relating to the Company's properties and assets or personnel  (collectively,
the  "Insurance")  and  (ii)  all other  "occurrence"  basis  insurance policies
maintained by  the Company  at any  time during  the past  five (5)  years  with
respect to the business.
 
    5.25.2   To the knowledge of the Company,  all of the Insurance is, and from
the date  of  this Agreement  to  the Effective  Time  will be,  sufficient  for
compliance  in all material respects with all requirements of applicable law and
of all contracts to which the Company is a party. The Company is not in  default
in  any material  respect under any  of the  Insurance, and the  Company has not
failed, to the Company's Knowledge, to give  any notice or to present any  claim
under  any  of  the  Insurance  in  a  due  and  timely  fashion.  No  notice of
cancellation, termination, reduction in coverage  or increase in premium  (other
than reductions in coverage or increases in premiums in the ordinary course) has
been  received  with respect  to any  of  the Insurance,  and all  premiums with
respect to  any of  the Insurance  have been,  and will  from the  date of  this
Agreement through the Effective Time be, timely paid.
 
    5.25.3    The  Company  has  not experienced  claims  in  excess  of current
Insurance coverage and the  Insurance is in full  force and effect. The  Company
will  use its best efforts to keep the Insurance in full force and effect by the
Company through the Effective Time. To the Company's Knowledge, there will be no
retrospective insurance premiums  or charges on  or with respect  to any of  the
Insurance for any period or occurrence through the Effective Time.
 
5.26  BANK ACCOUNTS, DIRECTORS AND OFFICERS
 
    Section  5.26  of  the  Company Disclosure  Schedule  contains  (i)  a true,
complete and correct list of all bank accounts and safe deposit boxes maintained
by the Company and all persons  entitled to draw thereon, to withdraw  therefrom
or  with access thereto, (ii) a description of all lock box arrangements for the
Company, (iii) the names of all the  directors and officers of the Company  and,
(iv) a true, complete and correct list of all powers of attorney executed by the
Company.
 
                                      A-21
<PAGE>
5.27  TAKEOVER PROVISIONS INAPPLICABLE
 
    As  of the date hereof and  at all times on or  prior to the Effective Time,
Sections 180.1130  to and  including 180.1150  of the  WBCL are,  and shall  be,
inapplicable to the Merger and the transactions contemplated by this Agreement.
 
5.28  FINANCIAL ADVISOR
 
    Except for Cowen & Company ("Cowen"), no broker, finder or investment banker
is  entitled to any brokerage, finder's or other fee or commission in connection
with the Merger or  the transactions contemplated by  this Agreement based  upon
arrangements  made  by  or on  behalf  of the  Company,  and (ii)  the  fees and
commissions payable to Cowen as contemplated by this Section will not exceed the
aggregate amount set forth in that certain letter, dated November 9, 1995,  from
Cowen to the Company.
 
5.29  ACCOUNTING MATTERS
 
    To  the Company's Knowledge,  the Company has not,  through the date hereof,
taken or agreed to take  any action that would  prevent Protocol or the  Company
from  accounting for the business combination to  be effected by the Merger as a
"pooling of interests."
 
5.30  OTHER NEGOTIATIONS
 
    Except for  the transactions  contemplated by  this Agreement,  there is  no
existing  commitment by the Company or any of  its shareholders to sell all or a
significant part  of  the assets  or  the stock  of  the Company,  there  is  no
outstanding  offer by the  Company or any of  its shareholders to  sell all or a
substantial part of the  assets or the  stock of the Company,  and there are  no
pending  negotiations involving the  Company or any of  its shareholders for the
sale of all or a substantial part of the assets or stock of the Company.
 
5.31  INVESTMENT COMPANY ACT
 
    The Company  is  not an  "investment  company"  within the  meaning  of  the
Investment Company Act of 1940.
 
5.32  NO COMPANY MATERIAL ADVERSE EFFECT
 
    Except  as disclosed  in the Company  Disclosure Schedule,  to the Company's
Knowledge there does not exist any fact or circumstance which, alone or together
with another  fact or  circumstance,  could reasonably  be  expected to  have  a
material   adverse  effect  on  the   business,  properties,  assets,  condition
(financial or otherwise), liabilities, operations or prospects of the Company.
 
5.33  INFORMATION IN DISCLOSURE DOCUMENTS
 
    5.33.1  None of the information with  respect to the Company supplied by  or
on  behalf  of the  Company for  the  purpose of  inclusion or  incorporation by
reference in the Registration Statement or the Proxy Statement/Prospectus  will,
(a)  in the case of the Registration Statement, at the time it becomes effective
and at the Effective Time,  contain any untrue statement  of a material fact  or
omit  to state any material  fact required to be  stated therein or necessary in
order to make the statements therein, in light of the circumstances under  which
they  are  made, not  misleading; or  (b) in  the case  of the  Proxy Statement/
Prospectus, at the time of mailing the Proxy Statement/ Prospectus, at the  time
of the Protocol Shareholders Meeting and at the time of the Company Shareholders
Meeting,  contain any untrue statement  of a material fact  or omit to state any
material fact required to be  stated therein or necessary  in order to make  the
statements therein, in light of the circumstances under which they are made, not
misleading; provided, however, that this provision shall not apply to statements
or  omissions in  the Registration  Statement or  the Proxy Statement/Prospectus
based upon information furnished by or on  behalf of Protocol or Merger Sub  for
use therein.
 
    5.33.2  If at any time prior to the Effective Time any event with respect to
the  Company or its  officers and directors  shall occur that  is required to be
described in the Proxy Statement/Prospectus  or the Registration Statement,  the
Company   shall   notify   Protocol   by   reference   to   this   Section   and
 
                                      A-22
<PAGE>
cooperate with Protocol in preparing and filing with the SEC and, as required by
law,  disseminating  to  the  shareholders  of  the  Company,  an  amendment  or
supplement which accurately describes such event or events.
 
    5.33.3  The information with respect to the Company supplied by or on behalf
of  the  Company  for  inclusion  or incorporation  by  reference  in  the Proxy
Statement/Prospectus will comply as  to form in all  material respects with  the
provisions  of  the  Exchange  Act and  the  rules  and  regulations thereunder;
provided, however,  that  this  provision  shall not  apply  as  to  information
furnished by or on behalf of Protocol or Merger Sub for use therein.
 
    5.33.4   No representation or warranty made by the Company contained in this
Agreement and no statement contained in any certificate, list, exhibit or  other
instrument specified in this Agreement, including without limitation the Company
Disclosure  Schedule, contains (or will contain  when made) any untrue statement
of a material fact or,  to the Company's Knowledge  omits (or, to the  Company's
Knowledge,  will omit when made) to state  a material fact necessary to make the
statements contained therein,  in light  of the circumstances  under which  they
were (or will be made), not misleading.
 
5.34  DISPOSITION OF PROTOCOL COMMON SHARES
 
    To  the Company's Knowledge,  there is no  present plan or  intention by the
shareholders of  the Company  who own  one percent  or more  of the  outstanding
Shares, and to the Company's Knowledge, there is no present plan or intention on
the  part of  the remaining  shareholders of the  Company to  sell, exchange, or
otherwise dispose of a number of  Protocol Common Shares received in the  Merger
that  would  reduce the  Company's  shareholders' ownership  of  Protocol Common
Shares to a number  having a value, as  of the Effective Time,  of less than  50
percent of the value of all of the formerly outstanding Shares of the Company as
of the same date. For purposes of this representation, Shares exchanged for cash
or  other property, surrendered by  dissenters or exchanged for  cash in lieu of
fractional Protocol Common Shares  will be treated as  outstanding Shares as  of
the Effective Time. Moreover, outstanding Shares and Protocol Common Shares held
by  the Company's shareholders and otherwise sold, redeemed or disposed of prior
or  subsequent  to  the  Effective  Time  will  be  considered  in  making  this
representation.
 
                                   ARTICLE 6
 
                   REPRESENTATIONS AND WARRANTIES OF PROTOCOL
 
    Protocol represents and warrants to the Company that, except as set forth in
the Protocol Disclosure Schedule:
 
6.1  ORGANIZATION AND QUALIFICATION
 
    Protocol is a corporation duly organized and validly existing under the laws
of  the State of Oregon and has the  corporate power to carry on its business as
it is now being  conducted and currently proposed  to be conducted. Protocol  is
duly qualified as a foreign corporation to do business, and is in good standing,
in  each jurisdiction where the character of  its properties owned or held under
lease or the nature of its activities make such qualification necessary,  except
where the failure to be so qualified will not, individually or in the aggregate,
have  a material adverse  effect on the  business, properties, assets, condition
(financial or otherwise), liabilities, operations  or prospects of Protocol  and
its  Subsidiaries  taken  as a  whole  in an  amount  in excess  of  $300,000 (a
"Protocol Material Adverse Effect"). Complete and correct copies as of the  date
hereof  of the  articles of  incorporation and  bylaws of  each of  Protocol and
Merger Sub have been delivered to the Company as part of the Protocol Disclosure
Schedule.
 
6.2  CAPITALIZATION
 
    The authorized capital  stock of  Protocol consists  of 30,000,000  Protocol
Common  Shares and  10,000,000 Shares  of Preferred  Stock, par  value $0.01 per
share. As of December  31, 1995, 7,400,838 Protocol  Common Shares were  validly
issued    and   outstanding,    fully   paid,    and   nonassessable    and   no
 
                                      A-23
<PAGE>
shares of preferred stock  were issued and outstanding,  and there have been  no
material changes in such numbers through the date hereof. As of the date hereof,
there  are no bonds, debentures, notes or other evidences of indebtedness having
the right to vote on any matters  on which the Protocol's shareholders may  vote
("Protocol  Voting Debt") issued or outstanding. As of December 31, 1995, except
for options to acquire 954,952 Protocol Common Shares or as otherwise set  forth
in  the Protocol  SEC Reports,  there are no  options, warrants,  calls or other
rights, agreements  or commitments  outstanding  obligating Protocol  to  issue,
deliver  or sell shares of  its capital stock or  debt securities, or obligating
Protocol to grant, extend or enter into any such option, warrant, call or  other
such  right, agreement or commitment and there  have been no material changes in
such numbers through the date hereof. All of the Protocol Common Shares issuable
in exchange for Shares at the  Effective Time in accordance with this  Agreement
will  be,  when  so issued,  duly  authorized,  validly issued,  fully  paid and
nonassessable, and shall be  registered under the  Securities Act, Exchange  Act
and  all applicable  state securities  laws governing  the issuance  and trading
thereof, and shall be delivered free and clear of all liens, claims, charges and
encumbrances of any kind or nature whatsoever.
 
6.3  SUBSIDIARIES
 
    There are no  "Significant Subsidiaries" (as  such term is  defined in  Rule
1-02  of Regulation  S-X of  the SEC  ("Significant Subsidiaries")  of Protocol.
Except for Merger Sub, Protocol does not directly or indirectly own any interest
in any other Person.
 
6.4  AUTHORITY RELATIVE TO THIS AGREEMENT
 
    6.4.1  Protocol has  the corporate power to  enter into this Agreement  and,
subject  to  approval of  the Issuance  by  its shareholders,  to carry  out its
obligations hereunder.
 
    6.4.2  The execution and delivery of this Agreement and the consummation  of
the  transactions contemplated  hereby have  been duly  authorized by Protocol's
Board of Directors. Except for the approval of Protocol's shareholders described
in Section 9.1.2,  no other corporate  proceedings on the  part of Protocol  are
necessary to authorize this Agreement and the transactions contemplated hereby.
 
    6.4.3    This  Agreement  constitutes  a  valid  and  binding  obligation of
Protocol, enforceable against Protocol  in accordance with  its terms except  as
enforcement  may  be limited  by bankruptcy,  insolvency  or other  similar laws
affecting the enforcement  of creditors'  rights generally and  except that  the
availability  of equitable remedies, including  specific performance, is subject
to the discretion of the court in which any such proceeding may be brought.
 
    6.4.4   Except for  the  approval of  Protocol's shareholders  described  in
Section  9.1.2, Protocol is not  subject to or obligated  under (i) any charter,
by-law, indenture or other loan document  provision or (ii) any other  contract,
Permit,  Order, lease, instrument,  statute, law, ordinance,  rule or regulation
applicable to Protocol or any of its Subsidiaries or their respective properties
or assets, which would be breached or violated, or under which there would be  a
default (with or without notice or lapse of time, or both), or under which there
would  arise  a  right  of  termination,  cancellation  or  acceleration  of any
obligation or the loss of a material benefit, by its executing and carrying  out
this  Agreement other than, in  the case of clause  (ii) only, (A) any breaches,
violations,  defaults,  terminations,  cancellations,  accelerations  or  losses
which,  either singly  or in  the aggregate, will  not have  a Protocol Material
Adverse Effect  or prevent  the consummation  of the  transactions  contemplated
hereby and (B) the laws and regulations referred to in Section 6.4.5.
 
    6.4.5   Except in connection,  or in compliance, with  the provisions of the
Exchange Act, the regulations of the Nasdaq/NMS, and the corporation, securities
or  blue  sky  laws  or  regulations  of  the  various  states,  no  Permit   or
Authorization is necessary for the consummation by Protocol of the Merger or the
other  transactions contemplated  by this Agreement,  other than Authorizations,
the failure  of which  to make  or obtain  would not  have a  Protocol  Material
Adverse  Effect  or prevent  the consummation  of the  transactions contemplated
hereby.
 
                                      A-24
<PAGE>
6.5  PROTOCOL ACTION
 
    The Board of Directors of Protocol (at  a meeting duly called and held)  has
by the requisite vote of all directors present (i) determined that the Merger is
advisable  and  in the  best interests  of Protocol  and its  shareholders, (ii)
approved the Merger in accordance with  the provisions of ORS 60.481, and  (iii)
recommended  the  approval of  the Issuance  and directed  that the  Issuance be
submitted  for  consideration  by   Protocol's  shareholders  at  the   Protocol
Shareholders Meeting.
 
6.6  REPORTS AND FINANCIAL STATEMENTS
 
    6.6.1   Protocol has previously furnished the Company with true and complete
copies of its (i) Annual Report on Form 10-K for the fiscal years ended December
31, 1992, December 31, 1993, and December 31, 1994, as filed with the SEC,  (ii)
Quarterly  Reports on Form 10-Q for the  quarters ended March 31, 1995, June 30,
1995, and  September 30,  1995 as  filed with  the SEC,  (iii) proxy  statements
related  to all meetings  of its shareholders (whether  annual or special) since
March 24, 1992 and  (iv) all other reports  or registration statements  declared
effective  by  the SEC  since March  24,  1992 (clauses  (i) through  (iv) being
referred to herein collectively as the "Protocol SEC Reports").
 
    6.6.2  As of  their respective dates, the  Protocol SEC Reports complied  in
all  material  respects  with the  requirements  of  the Securities  Act  or the
Exchange Act, as  the case  may be,  and the rules  and regulations  of the  SEC
thereunder applicable to such Protocol SEC Reports.
 
    6.6.3    As of  their respective  dates,  the Protocol  SEC Reports  did not
contain any untrue statement of a material fact or omit to state a material fact
required to be stated  therein or necessary to  make the statements therein,  in
light  of  the circumstances  under which  they were  made, not  misleading. The
audited  consolidated  financial  statements  and  unaudited  interim  financial
statements of Protocol included in the Protocol SEC Reports comply as to form in
all  material respects with applicable accounting requirements of the Securities
Act and with the published rules and regulations of the Commission with  respect
thereto.
 
    6.6.4   The  financial statements included  in the Protocol  SEC Reports and
Protocol's audited financial  statement (including balance  sheet, statement  of
income and statement of cash flows) as of and for the period ending December 31,
1995  (i) have  been prepared  in accordance with  GAAP applied  on a consistent
basis (except as may be indicated therein or in the notes thereto), (ii) present
fairly, in all  material respects, the  financial position of  Protocol and  its
subsidiaries  as at the  dates thereof and  the results of  their operations and
cash flows for  the periods then  ended subject,  in the case  of the  unaudited
interim  financial statements, to  normal year-end audit  adjustments, any other
adjustments described therein and  the fact that  certain information and  notes
have been condensed or omitted in accordance with the Exchange Act and the rules
promulgated  thereunder, and (iii)  are in accordance with  the books of account
and records of Protocol.
 
    6.6.5   To  the knowledge  of  Protocol, neither  Protocol  nor any  of  its
Subsidiaries  has any liabilities or  obligations (absolute, accrued, contingent
or otherwise), which are  material to Protocol and  its Subsidiaries taken as  a
whole  and which are not  disclosed or provided for  in the most recent Protocol
SEC Reports, other than liabilities and obligations incurred between the date of
the most recent Protocol SEC Report and  the date hereof in the ordinary  course
of  Protocol's business, consistent  with past practice  and except as otherwise
disclosed in this Agreement, including the Protocol Disclosure Schedule. To  the
best  knowledge of Protocol,  there is no  basis for any  such liability against
Protocol  or  its  Subsidiaries,   whether  absolute,  accrued,  contingent   or
otherwise,  which  is or  would  have a  Protocol  Material Adverse  Effect, not
reflected in the Protocol SEC Reports.
 
6.7  ABSENCE OF CERTAIN CHANGES OR EVENTS
 
    Since  September  30,  1995,  there  has  not  been  (i)  any   transaction,
commitment,  dispute or other event or condition (financial or otherwise) of any
character (whether or not in the ordinary course of business) individually or in
the aggregate having, or which could reasonably be expected to have, a  Protocol
Material  Adverse  Effect  (other  than  as  a  result  of  changes  in  laws or
regulations of general  applicability), (ii)  any damage,  destruction or  loss,
whether or not covered by insurance, which, insofar
 
                                      A-25
<PAGE>
as  reasonably can  be foreseen,  in the future  would have  a Protocol Material
Adverse Effect, (iii) any entry into  any commitment or transaction material  to
Protocol  and its subsidiaries taken as  a whole (including, without limitation,
any borrowing  or sale  of assets)  except in  the ordinary  course of  business
consistent  with  past  practice, or  (iv)  any  commencement or  notice,  or to
Protocol's knowledge,  threat  of  commencement,  of  any  Proceeding  involving
Protocol or its Subsidiaries or the affairs of any of them.
 
6.8  LITIGATION
 
    Except  as disclosed  in the  Protocol SEC  Reports, there  is no Proceeding
pending or, to the knowledge of Protocol, threatened against Protocol or any  of
its  Subsidiaries which, either  alone or in the  aggregate, could reasonably be
expected to have  a Protocol  Material Adverse Effect,  nor is  there any  Order
outstanding  against Protocol or any of its Subsidiaries having, or which in the
future could reasonably be expected to  have, either alone or in the  aggregate,
any Protocol Material Adverse Effect.
 
6.9  FAIRNESS OPINION
 
    Protocol  has received  the written opinion  of Wessels,  Arnold & Henderson
("Wessels"), financial  advisors to  Protocol,  dated the  date hereof,  to  the
effect  that the Applicable Merger Consideration  is fair to the shareholders of
Protocol from a financial point of view ("Protocol Fairness Opinion").
 
6.10  COMPLIANCE WITH PERMITS, APPLICABLE LAWS AND AGREEMENTS
 
    6.10.1   To the  knowledge  of Protocol,  Protocol  holds all  Permits,  the
failure  of which  to hold  would have a  Protocol Material  Adverse Effect (the
"Protocol Permits"). To  the knowledge  of Protocol, Protocol  is in  compliance
with  the terms  of the  Protocol Permits,  except for  such failures  to comply
which, individually or  in the  aggregate, would  not have  a Protocol  Material
Adverse Effect.
 
    6.10.2    To the  knowledge of  Protocol, Protocol's  business is  not being
conducted in violation of any law,  ordinance or regulation of any  Governmental
Authority, except for possible violations which individually or in the aggregate
do not and would not have a Protocol Material Adverse Effect.
 
    6.10.3  To the knowledge of Protocol, Protocol is not in default (and not in
a  circumstance which, with notice or lapse of time, or both, would constitute a
default) under any agreement or  instrument to which it  is a party, whether  or
not such default has been waived, except for any such default which, alone or in
the  aggregate  with other  such defaults,  would not  have a  Protocol Material
Adverse Effect.
 
    6.10.4   The provisions  of this  Section  6.10 shall  not be  construed  or
applied  to narrow or otherwise restrict  the scope of any other representations
and warranties in this Article 6.
 
6.11  SUPPLIERS AND CUSTOMERS
 
    To Protocol's knowledge, no substantial supplier or customer (who  accounted
for more than 2% of aggregate 1995 annual purchases or more than 2% of aggregate
1995 annual revenues, as the case may be, of Protocol) has indicated to Protocol
that  it intends to terminate its  relationship with Protocol; nor does Protocol
have knowledge that  any such  supplier or  customer intends  to terminate  such
relationship  or that any material problem or  dispute with any such supplier or
customer exists. In the opinion of Protocol, it has good business  relationships
with each such supplier and customer. Protocol has no reason to believe that the
consummation   of  the  Merger  would   or  might  disrupt  Protocol's  existing
relationships with any such supplier or customer.
 
6.12  PRODUCTS
 
    Protocol has  no knowledge  of  any material  defect in  design,  materials,
manufacture  or otherwise in  any products manufactured,  distributed or sold by
Protocol during  the  past  five (5)  years  or  any defect  in  repair  to,  or
replacement of, any such products which could give rise to any Protocol Material
Adverse Effect.
 
                                      A-26
<PAGE>
6.13  FINANCIAL ADVISOR
 
    Except  for Wessels, no  broker, finder or investment  banker is entitled to
any brokerage, finder's or other fee or commission in connection with the Merger
or the transactions contemplated by this Agreement based upon arrangements  made
by or on behalf of Protocol.
 
6.14  ACCOUNTING MATTERS
 
    To  Protocol's knowledge,  neither Protocol nor  any of  its Affiliates has,
through the date hereof, taken or agreed  to take any action that would  prevent
Protocol  or  the Company  from accounting  for the  business combination  to be
effected by the Merger as a "pooling of interests."
 
6.15  INVESTMENT COMPANY ACT
 
    Protocol is not an "investment company" within the meaning of the Investment
Company Act of 1940.
 
6.16  INFORMATION IN DISCLOSURE DOCUMENTS
 
    6.16.1  None of the information with  respect to Protocol supplied by or  on
behalf   of  Protocol  for  inclusion  or  incorporation  by  reference  in  the
Registration Statement or the Proxy  Statement/Prospectus will, (a) in the  case
of  the Registration  Statement, at  the time  it becomes  effective and  at the
Effective Time, contain any untrue statement of a material fact or omit to state
any material fact required to  be stated therein or  necessary in order to  make
the statements therein, in light of the circumstances under which they are made,
not  misleading; or (b) in  the case of the  Proxy Statement/ Prospectus, at the
time of mailing  the Proxy  Statement/Prospectus, at  the time  of the  Protocol
Shareholders  Meeting  and  at the  time  of the  Company  Shareholders Meeting,
contain any untrue statement of  a material fact or  omit to state any  material
fact  required to be stated therein or necessary in order to make the statements
therein,  in  light  of  the  circumstances  under  which  they  are  made,  not
misleading; provided, however, that this provision shall not apply to statements
or  omissions in  the Registration  Statement or  the Proxy Statement/Prospectus
based upon information furnished by or on behalf of the Company for use therein.
 
    6.16.2  If at any time prior to the Effective Time any event with respect to
Protocol or  its officers  and directors  shall  occur that  is required  to  be
described  in  the  Proxy Statement/Prospectus  or  the  Registration Statement,
Protocol shall notify  the Company by  reference to this  Section and  cooperate
with  the Company in preparing and filing with  the SEC and, as required by law,
disseminating to the shareholders of Protocol, an amendment or supplement  which
accurately describes such event or events.
 
    6.16.3   The Registration Statement  will comply as to  form in all material
respects with the provisions of the Securities Act and the rules and resolutions
promulgated thereunder. The Proxy Statement/Prospectus will comply as to form in
all material respects with the provisions of the Exchange Act and the rules  and
regulations promulgated thereunder; provided, however, that this provision shall
not  apply as to  information furnished by or  on behalf of  the Company for use
therein.
 
    6.16.4  No  representation or warranty  made by Protocol  contained in  this
Agreement  and no statement contained in any certificate, list, exhibit or other
instrument  specified  in  this  Agreement,  including  without  limitation  the
Protocol  Disclosure Schedule, contains  (or will contain  when made) any untrue
statement of  a material  fact or  omits (or  will omit  when made)  to state  a
material  fact necessary to  make the statements contained  therein, in light of
the circumstances under which they were (or will be made), not misleading.
 
                                      A-27
<PAGE>
                                   ARTICLE 7
 
                  REPRESENTATIONS AND WARRANTIES OF MERGER SUB
 
    Protocol and Merger Sub jointly and  severally represent and warrant to  the
Company as follows:
 
7.1  ORGANIZATION
 
    Merger  Sub is a  corporation duly organized and  validly existing under the
laws of the State of Wisconsin. Merger Sub has not filed articles of dissolution
and no corporate  action to  dissolve Merger Sub  has been  taken. Complete  and
correct copies as of the date hereof of the articles of incorporation and bylaws
of  Merger  Sub have  been  delivered to  the Company  as  part of  the Protocol
Disclosure Schedule.
 
7.2  CAPITALIZATION
 
    The authorized  capital stock  of Merger  Sub consists  of 9,000  shares  of
Common  Stock, par value $1.00 per share,  1,000 of which are validly issued and
outstanding, fully paid and nonassessable (subject to Section 180.0622(2)(b)  of
the WBCL, as judicially interpreted) and are owned by Protocol free and clear of
all Liens.
 
7.3  AUTHORITY RELATIVE TO THIS AGREEMENT
 
    7.3.1   Merger Sub has the corporate  power to enter into this Agreement and
to carry out its obligations hereunder.
 
    7.3.2  The execution and delivery of this Agreement and the consummation  of
the  transactions contemplated hereby have been  duly authorized by its Board of
Directors and sole shareholder, and no  other corporate proceedings on the  part
of  Merger Sub  are necessary to  authorize this Agreement  and the transactions
contemplated hereby.
 
    7.3.3  This Agreement constitutes a  valid and binding obligation of  Merger
Sub,  enforceable  against Merger  Sub in  accordance with  its terms  except as
enforcement may  be limited  to  bankruptcy, insolvency  or other  similar  laws
affecting  the enforcement  of creditors' rights  generally and  except that the
availability of equitable remedies,  including specific performance, is  subject
to  the discretion  of the  court before  which any  proceeding therefor  may be
brought.
 
    7.3.4  Merger Sub is not subject to or obligated under any charter or  bylaw
provision  which would be breached or violated by its executing and carrying out
this Agreement.
 
    7.3.5  Except as referred to herein or in connection, or in compliance, with
the provisions of  the Securities  Act, the  Exchange Act  and the  corporation,
securities   or  blue  sky  laws  or  regulations  of  the  various  states,  no
Authorization is necessary for the consummation  by Merger Sub of the Merger  or
the transactions contemplated by this Agreement.
 
7.4  MERGER SUB ACTION
 
    The Board of Directors of Merger Sub (at a meeting duly called and held) has
by the requisite vote of all directors present (i) determined that the Merger is
advisable  and in the best interests of  Merger Sub and (ii) approved the Merger
in accordance with the provisions of Section 180.1101 of the WBCL.
 
7.5  INTERIM OPERATIONS OF MERGER SUB
 
    Merger Sub was formed solely for the purpose of engaging in the transactions
contemplated hereby,  has  engaged  in  no other  business  activities  and  has
conducted its operations only as contemplated hereby.
 
                                      A-28
<PAGE>
                                   ARTICLE 8
 
                     CONDUCT OF BUSINESS PENDING THE MERGER
 
8.1  CONDUCT OF BUSINESS OF THE COMPANY
 
    Except  as contemplated  by this  Agreement or as  set forth  in the Company
Disclosure Schedule, during the  period from the date  of this Agreement to  the
Effective  Time, (a)  the Company will  conduct its operations  according to its
ordinary course of business consistent with past practice, (b) the Company  will
not  enter into any  material transaction other  than in the  ordinary course of
business consistent with past practice and (c) to the extent consistent with the
foregoing, with  no less  diligence and  effort  than would  be applied  in  the
absence  of this Agreement, the Company will seek to preserve intact its current
business organizations, keep available the  service of its current officers  and
employees  and preserve its  relationships with customers,  suppliers and others
having business dealings  with it  with the  objective that  their goodwill  and
ongoing  businesses shall be unimpaired at  the Effective Time. Without limiting
the generality  of the  foregoing, and  except as  otherwise permitted  in  this
Agreement,  prior to the Effective Time, the  Company will not without the prior
written consent of Protocol:
 
    8.1.1  Except for Shares issued  upon exercise of options outstanding as  of
the  date hereof under  the Company Option Plans,  issue, deliver, sell, dispose
or, pledge  or  otherwise  encumber,  or  authorize  or  propose  the  issuance,
delivery, sale, disposition or pledge or other encumbrance of (i) any additional
shares  of  its  capital stock  of  any  class (including  the  Shares),  or any
securities or rights convertible into, exchangeable for or evidencing the  right
to  subscribe for  any shares  of its  capital stock,  or any  rights, warrants,
options, calls, commitments or any other agreements of any character to purchase
or acquire  any  shares  of  its  capital stock  or  any  securities  or  rights
convertible, into, exchangeable for or evidencing the right to subscribe for any
shares  of its capital stock or (ii) any other securities in respect of, in lieu
of or in substitution for Shares outstanding on the date hereof;
 
    8.1.2  Redeem, purchase or otherwise acquire, or propose to redeem, purchase
or otherwise acquire, any of its outstanding securities (including the Shares);
 
    8.1.3  Split,  combine, subdivide or  reclassify any shares  of its  capital
stock  or declare, set aside for payment or  pay any dividend, or make any other
actual, constructive or  deemed distribution  in respect  of any  shares of  its
capital stock or otherwise may any payments to shareholders in their capacity as
such;
 
    8.1.4   (i) Grant any  material increases in the  compensation of any of its
directors, officers or key employees, except in the ordinary course of  business
consistent  with past practice, (ii) pay or agree to pay any pension, retirement
allowance or other material employee benefit not required or contemplated by any
Employee Plan or Benefit Arrangement as in effect on the date hereof to any such
director, officer or key employee, whether past or present, (iii) enter into any
new or  materially  amend  any  existing  employment  agreement  with  any  such
director,  officer or key employee, (iv) enter  into any new or materially amend
any existing severance agreement with any such director, officer or key employee
or (v)  except as  may be  required to  comply with  applicable law,  amend  any
existing,   or  become  obligated  under  any  new,  Employee  Plan  or  Benefit
Arrangement;
 
    8.1.5  Adopt a plan of complete or partial liquidation, dissolution, merger,
consolidation, restructuring, recapitalization  or other  reorganization of  the
Company (other than the Merger);
 
    8.1.6  Make any acquisition, by means of merger, consolidation or otherwise,
of  (i) any direct  or indirect ownership  interest in or  assets comprising any
business enterprise  or operation  or (ii)  except in  the ordinary  course  and
consistent with past practice, any other assets;
 
    8.1.7   Adopt  any amendments  to its  articles of  incorporation or bylaws,
other than to render  inapplicable to the  transactions contemplated hereby  the
rights of refusal contained in Section 6.04 of the Company's bylaws;
 
                                      A-29
<PAGE>
    8.1.8   (a) Other than borrowings in the ordinary course under the Company's
existing bank line of credit which, together with existing borrowings, do not in
the aggregate  exceed the  current  maximum borrowing  availability  thereunder,
incur  any indebtedness  for borrowed money  or guarantee  any such indebtedness
(the Company specifically acknowledging and agreeing that the Company shall  not
borrow money under its term loan and equipment purchase credit facilities, other
than  what it has already borrowed under  such credit facilities), or (b) except
in the  ordinary course  of business  consistent with  past practice,  make  any
loans,  advances  or  capital contributions  to,  or investments  in,  any other
Person;
 
    8.1.9   Engage  in the  conduct  of any  business  the nature  of  which  is
materially different than the business the Company is currently engaged in;
 
    8.1.10   Enter into  any agreement providing for  acceleration of payment or
performance or other  consequence as  a result  of a  change of  control of  the
Company;
 
    8.1.11   Enter into any contract, arrangement or understanding requiring the
purchase of equipment,  materials, supplies  or services over  a period  greater
than  12 months and for the expenditure  of greater than $25,000 per year, which
is not cancellable without  penalty on 30  days' or less  notice, except in  the
ordinary  course of business for the  distribution of products or the production
of inventory; or
 
    8.1.12  Authorize or announce  an intention to do  any of the foregoing,  or
enter  into any contract, agreement, commitment or  arrangement to do any of the
foregoing.
 
8.2  CONDUCT OF BUSINESS OF PROTOCOL
 
    Prior to the Effective Time, Protocol will carry on its business  consistent
with  its past practices, will notify the Company of the occurrence of any event
having a  material  adverse effect  upon  its business  prospects  or  financial
condition  and without the prior written consent of the Company, will not do any
of the following:
 
    8.2.1  Take any action  or permit any action to  be taken other than in  the
ordinary  course of business which is  inconsistent with preserving its existing
business organization  and relations  with employees,  customers, suppliers  and
others  with whom it has a business  relationship and with protecting its rights
and properties; or
 
    8.2.2  Conduct  its business other  than in compliance  with all  applicable
laws and regulations in all material respects.
 
8.3  CONDUCT OF BUSINESS OF MERGER SUB
 
    During  the period from  the date of  this Agreement to  the Effective Time,
Merger Sub shall not engage in any  activities of any nature except as  provided
in or contemplated by this Agreement.
 
8.4  NOTICE OF BREACH
 
    Each  party  shall promptly  give  written notice  to  the other  party upon
becoming aware of the occurrence or,  to its knowledge, impending or  threatened
occurrence,  of  any  event which  would  cause  any of  its  representations or
warranties to be untrue on the Effective Time or cause a breach of any  covenant
contained  or  referenced in  this Agreement  and will  use its  best reasonable
efforts to prevent or promptly remedy the same. Any such notification shall  not
be  deemed  an amendment  of  the Company  Disclosure  Schedule or  the Protocol
Disclosure Schedule.
 
                                   ARTICLE 9
 
                             ADDITIONAL AGREEMENTS
9.1  MEETINGS OF SHAREHOLDERS
 
    9.1.1   The  Company will  take  all  action necessary  in  accordance  with
applicable law and its articles of incorporation and bylaws to convene a meeting
of  its  shareholders  (the  "Company  Shareholders  Meeting")  as  promptly  as
practicable  to   consider  and   vote  upon   the  approval   of  the   Merger.
 
                                      A-30
<PAGE>
Subject  to  the fiduciary  duties  of the  Company's  Board of  Directors under
applicable law as  advised by  counsel, the Board  of Directors  of the  Company
shall  recommend and declare advisable such  approval and the Company shall take
all lawful action  to solicit, and  use all reasonable  efforts to obtain,  such
approval. By agreement dated the date hereof (the "Voting Agreement"), a copy of
which  is attached hereto as Exhibit 9.1.1 the shareholders owning the requisite
number of Shares necessary to approve the Merger each have agreed to vote in the
manner specified in  the Voting Agreement.  A correct and  complete copy of  the
Voting Agreement has been delivered to Protocol.
 
    9.1.2  Protocol will take all action necessary in accordance with applicable
law,  Section 1(c) of Schedule D to  the Bylaws of NASD, and Protocol's articles
of incorporation  and bylaws  to  convene a  meeting  of its  shareholders  (the
"Protocol Shareholders Meeting") as promptly as practicable to consider and vote
upon  (a) the approval of  the issuance of Protocol  Common Shares in the Merger
and (b)  the amendment  to Protocol's  1992 Stock  Option Plan  to increase  the
number  of Protocol Common Shares reserved  for issuance thereunder to an amount
sufficient to enable Protocol to issue Protocol Common Shares to all holders  of
options  under such Plan,  including the Replacement  Options (collectively, the
"Issuance"). Subject to the  fiduciary duties of  Protocol's Board of  Directors
under  applicable law as advised by counsel,  the Board of Directors of Protocol
shall recommend and declare advisable such approval and Protocol shall take  all
lawful  action  to  solicit, and  use  all  reasonable efforts  to  obtain, such
approval.
 
    9.1.3  Protocol, as the sole shareholder of Merger Sub, has acted by written
consent to approve the Merger and the adoption of this Agreement by Merger  Sub,
which  consent Protocol  and Merger  Sub represent  and warrant  constitutes the
requisite approval of the Merger and this Agreement by Merger Sub.
 
9.2  REGISTRATION STATEMENT/PROXY MATERIALS
 
    9.2.1  The Company shall cooperate with Protocol and Protocol shall use  all
reasonable  efforts to promptly  prepare and file  with the SEC  and cause to be
made effective a Registration  Statement (on such  appropriate form therefor  as
Protocol  shall select, including  a prospectus which  shall be in  such form as
permitted in the  form of such  Registration Statement so  selected and a  proxy
statement complying with the Exchange Act) under the Securities Act covering the
Protocol  Common Shares to be  issued in the Merger.  As used in this Agreement,
the term Registration Statement refers to and means said Registration  Statement
when  it  becomes  effective  under  the Securities  Act,  and  the  term "Proxy
Statement/Prospectus" refers to and  means the proxy  statement included in  the
Registration  Statement when  it becomes  effective. The  Registration Statement
will be effective on the date on which  the Company mails to the holders of  its
Shares  the Proxy Statement/Prospectus with respect to the Company Shareholders'
meeting, on the date  such meeting is  held, and on  the Closing Date.  Protocol
shall  also  take  any action  required  to be  taken  under state  blue  sky or
securities  laws,  statutes,  codes,   ordinances,  rules  and  regulations   in
connection  with the issuance  of shares of  Protocol Common Shares contemplated
hereunder.
 
    9.2.2  Protocol and the Company will use all reasonable efforts to have  the
Registration  Statement, or  cause it to  be, declared effective  as promptly as
practicable, and also  will take  any other action  required to  be taken  under
federal  or state securities laws, and will  use all reasonable efforts to cause
the Proxy Statement/Prospectus to be mailed to shareholders of Protocol and  the
shareholders of the Company at the earliest practicable date or dates. If at any
time  prior to the Effective Time any event relating to or affecting the Company
or Protocol shall occur as a result of which it is necessary, in the opinion  of
counsel  for the Company or of counsel  for Protocol, to supplement or amend the
Registration Statement in order to make such document not misleading in light of
the circumstances existing  at the  time approvals  of the  shareholders of  the
Company  and Protocol, respectively,  are sought, the  Company and Protocol will
forthwith prepare  and file  with the  SEC  an amendment  or supplement  to  the
Registration  Statement so  that each document,  as so  supplemented or amended,
will not contain any untrue  statement of a material fact  or omit to state  any
material fact necessary in order to make the statements therein, in light of the
circumstances existing at such time, not misleading.
 
                                      A-31
<PAGE>
9.3  AFFILIATES OF PROTOCOL AND THE COMPANY
 
    9.3.1   Set forth  in the Company  Disclosure Schedule are  the names of all
Persons who may be deemed to be "affiliates" of the Company for purposes of Rule
145 under the Securities Act (the "Rule 145 Affiliates") or who may otherwise be
deemed to  be  Affiliates of  the  Company. Each  such  Rule 145  Affiliate  has
delivered  to Protocol a written agreement that such Rule 145 Affiliate will not
sell, pledge, transfer or otherwise dispose of any Protocol Common Shares issued
to such  Rule  145 Affiliate  pursuant  to the  Merger,  except pursuant  to  an
effective  registration statement or in compliance with Rule 145 or an exemption
from the registration requirements of the Securities Act.
 
    9.3.2  Each of Protocol and the Company shall use all reasonable efforts  to
cause  their  respective Affiliates  not to  take any  action that  would impair
Protocol's ability to account for the Merger as a pooling of interests.
 
    9.3.3  In accordance  with the foregoing, each  Rule 145 Affiliate has  also
agreed  in such written agreement  that such Rule 145  Affiliate will not, after
the earlier of  (i) the mailing  of the Proxy  Statement/Prospectus or (ii)  the
thirtieth  (30th) day  prior to  the Effective  Time, sell  or in  any other way
reduce such Rule  145 Affiliate's risk  relative to any  Protocol Common  Shares
received  in  the  Merger  (within  the meaning  of  the  SEC's  Codification of
Financial Reporting  Policies 201.01,  reprinted in  7 Fed.  Sec. L.  Re.  (CCH)
72,951,  until such time as financial  results (including combined sales and net
income) covering at least 30 days of post-merger operations have been  published
(which  financial results  Protocol agrees  to publish  in accordance  with past
practice as  part of  its applicable  Form  10-Q or  10-K filing  covering  such
period),  except as permitted by Staff Accounting  Bulletin No. 76 issued by the
SEC.
 
9.4  REGISTRATION AND QUOTATION OF PROTOCOL COMMON SHARES
 
    9.4.1   Protocol will  register  the Protocol  Common  Shares to  be  issued
pursuant  to this Agreement, and upon exercise of the Replacement Options, under
the applicable provisions of the Securities Act.
 
    9.4.2  Protocol will cause the Protocol Common Shares to be issued  pursuant
to  this Agreement, and upon  exercise of the Replacement  Options, to be quoted
for trading on the Nasdaq/NMS.
 
9.5  TAX TREATMENT OF MERGER
 
    Each party agrees to report the Merger on all tax returns and other  filings
as  a tax-free reorganization under Section 368(a)  of the Code except where, in
the opinion of tax counsel to such party, there is not "substantial  authority,"
as defined in Section 6662 of the Code, to support such a position.
 
9.6  REASONABLE EFFORTS
 
    9.6.1    The Company,  Protocol  and Merger  Sub  shall, and  shall  use all
reasonable efforts to cause their respective Subsidiaries to: (a) promptly  make
all  filings and seek to obtain all Authorizations required under all applicable
laws with respect to the Merger and other transactions contemplated hereby,  and
the  parties will cooperate  with each other  with respect thereto;  (b) use all
reasonable efforts to promptly take, or cause to be taken, all other actions and
do, or cause to be  done, all other things  necessary, proper or appropriate  to
satisfy  the  conditions set  forth in  Article  10 and  to consummate  and make
effective the  transactions contemplated  by  this Agreement  on the  terms  and
conditions  set forth herein as soon  a practicable (including seeking to remove
promptly  any  injunction  or  other   legal  barrier  that  may  prevent   such
consummation);  (c) not  take any action  which might reasonably  be expected to
impair the  ability of  the parties  to consummate  the Merger  at the  earliest
possible time (regardless of whether such action would otherwise be permitted or
not  prohibited hereunder); and  (d) not take any  action (regardless of whether
such action  would otherwise  be  permitted or  not prohibited  hereunder)  that
prevents Protocol from accounting for the Merger as a pooling of interests.
 
    9.6.2   After the time,  if any, that the  Registration Statement shall have
been declared effective, Protocol  shall promptly notify the  Company if at  any
time it has reason to believe that Peat Marwick
 
                                      A-32
<PAGE>
will  not be able  to deliver the opinion  referred to in  Section 10.1.5 at the
Closing, and each of Protocol and the Company shall promptly advise the other of
any fact  or  circumstance  of  which  it  becomes  aware  (and  which  has  not
theretofore  been  disclosed to  the other)  which  it believes  would adversely
impact the ability to satisfy such condition set forth in Section 10.1.5.
 
    9.6.3  During the period of 60 days prior to the Closing, Protocol will  not
repurchase  or otherwise acquire in the public market, or announce any intention
or proposal to repurchase or otherwise acquire in the public market, any  shares
of  its capital stock (other  than immaterial numbers of  shares in the ordinary
course and consistent with past practice and at prevailing market prices).
 
9.7  OTHER TRANSACTIONS
 
    Prior to  the  Closing,  neither  the  Company  nor  any  of  its  officers,
employees,  representatives, agents or Affiliates  will, directly or indirectly,
encourage, solicit or engage in discussions or negotiations with any third party
(other than Protocol)  concerning any merger,  consolidation, share exchange  or
similar  transaction  involving  the  Company,  or  any  purchase  of  all  or a
significant portion of the assets of or  equity interest in the Company, or  any
other  transaction  that would  involve the  transfer  or potential  transfer of
control of the  Company, other  than the transactions  contemplated hereby.  The
Company  will notify  Protocol immediately  of any  inquiries or  proposals with
respect to any such transaction that  are received by, or any such  negotiations
or discussions that are sought to be initiated with, the Company.
 
9.8  ACCESS TO INFORMATION
 
    Subject  to currently existing contractual and legal restrictions applicable
to the Company (which the Company  represents and warrants are not material)  or
to  Protocol (which Protocol represents and warrants are not material), and upon
reasonable notice, each of the Company and Protocol shall during normal business
hours throughout the period prior to the Effective Time or until this  Agreement
is  terminated (a) afford to officers, employees, counsel, accountants and other
authorized representatives  of the  other party  ("Authorized  Representatives")
access  to its properties, books and records (including, without limitation, the
work papers  of  independent accountants);  and  (b) furnish  promptly  to  such
Authorized  Representatives all information  concerning its business, properties
and personnel as  may reasonably  be requested, provided  that no  investigation
pursuant  to  this  Section shall  affect  or be  deemed  to modify  any  of the
respective representations or warranties  made by Protocol  or the Company.  The
use  and  protection of  all  information provided  by  one party  to  the other
pursuant to this Section shall be governed by the Confidentiality Agreement.
 
9.9  EMPLOYEE MATTERS
 
    Protocol intends to review  each Employee Plan  and Benefit Arrangement  for
compatibility  with similar programs  maintained by Protocol  for its employees.
Protocol may decide to have the Surviving Corporation continue in effect, amend,
modify or terminate in their entirety any one or more of the Employee Plans  and
Benefit   Arrangements,  or  merge  any  of   the  Employee  Plans  and  Benefit
Arrangements into a comparable program maintained by Protocol and adopted by the
Surviving Corporation. Any such amendment, modification or termination shall not
deprive any Person  who is  an Employee  of the  Company on  the Effective  Time
("Affected  Employee")  of any  accrued benefit  payment  to which  the Affected
Employee has become entitled prior to  the Effective Time. If Protocol does  not
maintain a program similar to one of the Employee Plans or Benefit Arrangements,
there  shall  be  no  obligation  on  the  part  of  Protocol  or  the Surviving
Corporation to adopt any program upon the discontinuance or termination of  such
Employee  Plan  or  Benefit  Arrangement.  Protocol  will  cause  the  Surviving
Corporation to give  each Affected  Employee full  credit for  service with  the
Company  for purposes of  eligibility to participate in,  vesting and payment of
benefits under, amounts of and  eligibility for any subsidized benefit  provided
under, any Protocol employee benefit plan or program of whatever kind adopted by
the Surviving Corporation.
 
                                      A-33
<PAGE>
9.10  PAYMENT OF SHAREHOLDER NOTES PAYABLE
 
    At the Closing, or within ten (10) days thereafter, Protocol shall cause the
Company to pay in full the Shareholder Notes Payable.
 
9.11  INDEMNIFICATION OF OFFICERS AND DIRECTORS
 
    During  the period beginning  on the Closing  Date and ending  on the second
anniversary thereof,  Protocol  will  cause  the  Company  to  maintain  in  the
Surviving  Corporation's  articles  of incorporation  and  bylaws  the Company's
current provisions regarding indemnification of officers and directors.
 
                                   ARTICLE 10
 
                              CONDITIONS PRECEDENT
10.1  CONDITIONS TO EACH PARTY'S OBLIGATIONS
 
    The respective  obligations of  each party  to consummate  the  transactions
contemplated by this Agreement are subject to the fulfillment at or prior to the
Effective  Time of each of the following conditions,  any or all of which may be
waived in whole or in part by the party being benefitted thereby, to the  extent
permitted by applicable law:
 
    10.1.1  COMPANY SHAREHOLDER APPROVAL
 
    This Agreement and the transactions contemplated hereby shall have been duly
approved  or  ratified by  the requisite  holders of  Shares in  accordance with
applicable provisions  of  the  WBCL  (including,  without  limitation,  Section
180.1103), and the articles of incorporation and bylaws of the Company.
 
    10.1.2  PROTOCOL SHAREHOLDER APPROVAL
 
    The  Issuance  shall have  been duly  approved by  the requisite  holders of
Protocol Common Shares in  accordance with applicable  provisions of the  Oregon
Business  Corporation  Act  (including,  without  limitation,  ORS  60.487), the
articles of incorporation and bylaws of Protocol and Section 1(c) of Schedule  D
to the Bylaws of the NASD.
 
    10.1.3  NO ORDER
 
    There  shall not be in effect any Order of any court or Governmental Body of
competent  jurisdiction   restraining,   enjoining   or   otherwise   preventing
consummation  of  the transactions  unacceptable to  either  of Protocol  or the
Company, each in its reasonable  judgment (which reasonable judgment shall  take
into  account,  without  limitation,  the size  and  scope  of  the transactions
contemplated hereby and the  benefits anticipated to be  derived by Protocol  or
the Company, as the case may be, from its rights and obligations hereunder).
 
    10.1.4  REGISTRATION STATEMENT AND SECURITIES LAWS AUTHORIZATIONS
 
    The  Registration Statement shall have been  declared effective and shall be
effective at  the Effective  Time, and  no Stop  Order suspending  effectiveness
shall  have been issued, no  Proceeding by the SEC  to suspend the effectiveness
thereof  shall  have  been  initiated  and  be  continuing,  and  all  necessary
Authorizations under state securities laws or the Securities Act or Exchange Act
relating  to the issuance  or trading of  the Protocol Common  Shares shall have
been received.
 
    10.1.5  POOLING OPINIONS
 
    On or before the filing of the Registration Statement with the SEC, Protocol
shall have  received an  opinion  of Peat  Marwick,  in substantially  the  form
attached  hereto as Exhibit  10.1.5(a) and a letter  from Price Waterhouse, LLP,
addressed to the Company's Board of Directors in substantially the form attached
hereto as Exhibit 10.1.5 (b).
 
                                      A-34
<PAGE>
    10.1.6  DISSENTERS' RIGHTS
 
    Holders of no  more than  that number of  shares which,  if all  outstanding
shares  of Company Preferred  Stock were converted into  Company Common Stock at
the specified conversion rates, would equal five percent (5%) of all outstanding
Company Common Stock after giving effect  to the conversion, shall have  validly
exercised and not withdrawn appraisal rights under applicable law.
 
10.2  CONDITIONS TO OBLIGATIONS OF PROTOCOL AND MERGER SUB
 
    The  respective obligations  of Protocol  and Merger  Sub to  consummate the
transactions contemplated by this Agreement are subject to the fulfillment at or
prior to the Effective Time of each  of the following conditions, any or all  of
which may be waived in whole or part by Protocol and Merger Sub, as the case may
be, to the extent permitted by applicable law.
 
    10.2.1  REPRESENTATIONS AND WARRANTIES TRUE
 
    The representations and warranties of the Company contained in Article 5 and
Section  9.8 (or otherwise required hereby to be made after the date hereof in a
writing expressly referred to herein by or on behalf of the Company pursuant  to
this  Agreement) shall  have been  true in all  material respects  when made and
shall be true in  all material respects on  and as of the  Effective Time as  if
made  on and as of  such date (except to  the extent they relate  to the date of
this Agreement or any other particular date).
 
    10.2.2  PERFORMANCE
 
    The Company shall have performed or  complied in all material respects  with
all  agreements  and conditions  contained herein  required  to be  performed or
complied with by it prior to or at the time of Closing.
 
    10.2.3  CERTIFICATES
 
    The Company shall have  delivered to Protocol (a)  a certificate, dated  the
date  of the Closing, signed  by the President of  the Company, certifying as to
the fulfillment of the conditions specified  in Sections 10.2.1 and 10.2.2,  and
(b) the Exchange Ratio Certificate.
 
    10.2.4  PERMITS AND AUTHORIZATIONS
 
    All  Permits and  Authorizations described in  Sections 5.4 and  5.10 of the
Company Disclosure Schedule shall have been obtained.
 
    10.2.5  TAX OPINION
 
    On the date hereof, Protocol shall have received an opinion of Peat  Marwick
in substantially the form attached hereto as Exhibit 10.2.5.
 
    10.2.6  CONFIRMATION OF FAIRNESS OPINION
 
    Immediately prior to (a) the date on which the Proxy Statement/Prospectus is
mailed  to the  Protocol shareholders and  (b) the closing  date, Protocol shall
have received  a  letter from  Wessels  confirming and  restating  the  Protocol
Fairness Opinion.
 
    10.2.7  RESULTS OF AUDIT; INTERIM FINANCIAL PERFORMANCE
 
        (a)  The audited results of the  Company's operations for the year ended
    December 31, 1995 shall reflect sales by the Company of not less than  $12.2
    million  and  Company net  income  of not  less  than $775,000.  The audited
    balance sheet amounts  as of  December 31,  1995 shall  be substantially  as
    presented  on  the  unaudited  balance sheet  with  the  exception  of minor
    adjustments and/ or reclassifications.
 
        (b) Protocol will also have had the opportunity to review the  Company's
    most  recent internally prepared,  unaudited financial statements  up to the
    time of  Closing and  shall be  satisfied that  the interim  results of  the
    Company's   operations   are   consistent  with   the   Company's  financial
 
                                      A-35
<PAGE>
    forecasts contained in the 1996 Budget  presented to the Company's Board  of
    Directors  on  December  14,  1995  (the  "Budget").  Without  limiting  the
    foregoing, Protocol shall be satisfied that the Company's interim  unaudited
    results    of   operations   indicate    the   following:   (i)   cumulative
    revenue-year-to-date and net income-year-to-date of not less than eighty-two
    and one-half  percent  (82.5%)  of the  budgeted  1996  operating  statement
    amounts  as reflected in the Budget;  (ii) gross profit margins greater than
    forty percent  (40%);  and (iii)  a  current ratio  in  excess of  1.6.  For
    purposes  of  whether  the  Company's  interim  unaudited  results  meet the
    requirements set forth in this  Section 10.2.7(b) and Section 10.2.8,  there
    shall  not be taken into  account either (i) the  effects of any transaction
    costs  (including  professional  fees)  incurred  in  connection  with   the
    negotiation   and  execution  of  this   Agreement  or  (ii)  the  financial
    consequences, if any, described in Section 5.19.
 
    10.2.8  COMPANY CHIEF FINANCIAL OFFICER LETTER
 
    Protocol shall have received  from the Company's  Chief Financial Officer  a
letter,  dated the Closing Date, stating that on  the basis of his review of the
then most recent  internally prepared,  unaudited financial  statements for  the
Company  and his knowledge of the financial  status and condition of the Company
up to the  Closing Date,  there has  been no  materially adverse  change in  the
financial  condition  or results  of operations  of the  Company since  the last
audited financial  statements.  For purposes  of  this Section  10.2.8  and  the
letter,  "materially adverse" shall be deemed to be (a) a projected shortfall of
the cumulative revenue-to-date or cumulative net income-to-date from the amounts
reflected in the Budget of over  seventeen and one-half percent (17.5%); (b)  if
gross  margins shall have  declined below forty percent  (40%) on a year-to-date
basis; or (c)  a change in  financial position such  that the Company's  current
ratio  is not in excess of 1.6. In  addition, the letter will attest to the fact
that the Company  has adhered  to the  same accounting  policies and  procedures
represented  in the last  audited financial statements,  and that these policies
and procedures have been applied on a consistent basis.
 
    10.2.9  TERMINATION OF ALL SHAREHOLDER AGREEMENTS
 
    All shareholder,  voting or  other agreements  with respect  to the  capital
stock  of  the  Company  shall  have  been  terminated  (other  than  the Voting
Agreement).
 
    10.2.10  CONTINUATION OF EXISTING NONCOMPETITION AGREEMENTS
 
    Protocol shall have  received evidence  reasonably satisfactory  to it  that
each  of Daniel  F. Carsten,  Robert M. Ricciardelli  and Robert  M. Sommer have
agreed in writing that the Merger  will not cause a termination or  modification
of, or otherwise adversely affect, the Company's rights under currently existing
noncompetition agreements executed by such Persons.
 
    10.2.11  ESCROW AGREEMENT
 
    The  Company and each of  the holders of outstanding  Shares shall have duly
executed and delivered to Protocol the Escrow Agreement.
 
    10.2.12  OPINION OF COUNSEL
 
    Protocol shall have received from Michael Best & Friedrich, an opinion dated
the Closing Date, in substantially the form attached hereto as Exhibit 10.2.12.
 
10.3  CONDITIONS TO OBLIGATIONS OF THE COMPANY
 
    The obligations of the Company  to consummate the transactions  contemplated
by  this Agreement are subject  to the fulfillment at  or prior to the Effective
Time of each of the following conditions, any  or all of which may be waived  in
whole or in part by the Company to the extent permitted by applicable law.
 
                                      A-36
<PAGE>
    10.3.1  REPRESENTATIONS AND WARRANTIES TRUE
 
    The  representations and warranties of Protocol  and Merger Sub contained in
Articles 6 and 7 (or otherwise required hereby to be made after the date  hereof
in a writing expressly referred to herein by or on behalf of Protocol and Merger
Sub  pursuant to this Agreement)  shall have been true  in all material respects
when made and shall be true in all material respects on and as of the  Effective
Time  as if made on and as of such date (except to the extent they relate to the
date of this Agreement or any other particular date).
 
    10.3.2  PERFORMANCE
 
    Protocol and Merger  Sub shall have  performed or complied  in all  material
respects  with all  agreements and  conditions contained  herein required  to be
performed or complied  with by  each of  them prior  to or  at the  time of  the
Closing.
 
    10.3.3  COMPLIANCE CERTIFICATE
 
    Protocol  and Merger Sub shall have  delivered to the Company a certificate,
dated the Closing Date, signed by the President of Protocol and the President of
Merger Sub, respectively, certifying as to the fulfillment by each entity of the
conditions specified in Sections 10.3.1 and 10.3.2.
 
    10.3.4  PERMITS AND AUTHORIZATIONS
 
    All Permits  and Authorizations  described in  Section 6.4  of the  Protocol
Disclosure Schedule shall have been obtained.
 
    10.3.5  TAX OPINION
 
    The  Company shall have received an opinion  of Michael Best & Friedrich, or
Price Waterhouse, LLP, to  the effect that  (i) the Merger  will be treated  for
federal  income tax purposes  as a reorganization within  the meaning of Section
368(a) of the Code; (ii) each of Protocol, Merger Sub and the Company will be  a
party  to the reorganization within  the meaning of Section  368(b) of the Code;
(iii) no gain  or loss will  be recognized by  the Company, or  Merger Sub as  a
result of the Merger; (iv) no gain or loss will be recognized by shareholders of
the  Company as  a result  of the  Merger with  respect to  the Shares converted
solely into Protocol Common Shares  or as a result of  the return of the  Escrow
Shares  to Protocol; and  (v) no gain or  loss will be  recognized by holders of
Existing Options upon the exchange of Existing Options for Replacement  Options.
In  rendering such opinions, Michael Best  & Friedrich or Price Waterhouse, LLP,
as the  case may  be, may  receive and  rely upon  representations contained  in
certificates of the Company, Protocol, Merger Sub and others.
 
    10.3.6  OPINION OF COUNSEL
 
    The  Company shall have  received from Ater Wynne  Hewitt Dodson & Skerritt,
counsel to Protocol,  an opinion dated  the Closing Date,  in the form  attached
hereto as Exhibit 10.3.6.
 
                                      A-37
<PAGE>
                                   ARTICLE 11
 
                       TERMINATION, AMENDMENT AND WAIVER
11.1  TERMINATION
 
    This  Agreement may be terminated  at any time prior  to the Effective Time,
whether before or after approval of the matters presented in connection with the
Merger by the shareholders of the Company or the shareholders of Protocol:
 
    11.1.1  By  mutual consent of  the Board  of Directors of  Protocol and  the
Board of Directors of the Company;
 
    11.1.2   By either Protocol or the Company if the Merger shall not have been
consummated on or before  July 12, 1996 (provided  the terminating party is  not
otherwise  in material breach  of its representations,  warranties, covenants or
agreements under this Agreement);
 
    11.1.3  By the Company if any  of the conditions specified in Sections  10.1
or  10.3  have not  been met  or  waived by  the Company  at  such time  as such
condition is no longer capable of satisfaction, including the failure to  obtain
any required approval of its shareholders at a duly held meeting of shareholders
or  at an adjournment thereof (provided the Company is not otherwise in material
breach of its  representations, warranties, covenants  or agreements under  this
Agreement,  which  breach  is  the  direct and  proximate  cause  of  the failed
condition);
 
    11.1.4  By Protocol if any of  the conditions specified in Sections 10.1  or
10.2  have not been met or waived by  Protocol at such time as such condition is
no longer capable of satisfaction, including the failure to obtain any  required
approval  of  the  shareholders  of  the  Company  at  a  duly  held  meeting of
shareholders or at an adjournment thereof (provided Protocol is not otherwise in
material breach of its representations, warranties covenants or agreements under
this Agreement, which  breach is the  direct and proximate  cause of the  failed
condition);
 
    11.1.5   By  either Protocol  or the  Company if  there has  been a material
breach on the  part of the  other of any  representation, warranty, covenant  or
agreement  set forth in this Agreement, which  breach, has not been cured within
fifteen (15) business days following receipt  by the breaching party of  written
notice of such breach;
 
    11.1.6   By either Protocol or the  Company upon written notice to the other
party if any Governmental Authority of competent jurisdiction shall have  issued
a  final permanent Order enjoining or  otherwise prohibiting the consummation of
the transactions contemplated by this Agreement,  and in any such case the  time
for  appeal or  petition for  reconsideration of  such Order  shall have expired
without such appeal or petition being granted; or
 
11.2  EFFECT OF TERMINATION
 
    In the event  of termination  of this Agreement  by either  Protocol or  the
Company  as  provided  above, this  Agreement  shall forthwith  become  void and
(except for  termination of  this Agreement  pursuant to  Section 11.1.5)  there
shall  be no  liability on the  part of either  the Company, Protocol  or Sub or
their respective officers or directors;  provided that Section 5.28 and  Section
6.13,  the last sentence of Section 9.8, this Section 11.2 and the provisions of
Article 13 shall survive the termination.
 
11.3  AMENDMENT
 
    This Agreement  may be  amended by  the parties  hereto, by  or pursuant  to
action  taken by  their respective  Boards of Directors,  at any  time before or
after approval hereof by the shareholders of the Company and the shareholders of
Protocol, but, after such  approvals, no amendment shall  be made which  changes
the  Applicable Merger  Consideration or which  in any  way materially adversely
affects the  rights of  the  shareholders of  either  the Company  or  Protocol,
without  the  further  approval  of the  adversely  affected  shareholders. This
Agreement may not be amended except by an instrument in writing signed on behalf
of each of the parties hereto.
 
                                      A-38
<PAGE>
11.4  WAIVER
 
    At any time prior to the Effective Time, the parties hereto, by or  pursuant
to action taken by their respective Boards of Directors, may (i) extend the time
for the performance of any of the obligations or other acts of the other parties
hereto, (ii) waive any inaccuracies in the representations and warranties of any
other  party contained herein  or in any documents  delivered pursuant hereto by
any other  party  and (iii)  waive  compliance with  any  of the  agreements  or
conditions contained herein; provided, however, that, except as set forth in the
next  sentence, no such  waiver shall materially adversely  affect the rights of
the shareholders of the Company or the shareholders of Protocol, as the case may
be. Notwithstanding the  foregoing, an  election by Protocol  to consummate  the
Merger  contemplated  hereby notwithstanding  Protocol's  actual knowledge  of a
breach or inaccuracy of any representation or warranty made by the Company shall
constitute a  waiver  and  release of  any  claim  against the  Company  or  its
shareholders  which Protocol may have therefor (whether such claim is for breach
of representation or warranty, indemnification or otherwise), unless on the date
of this Agreement the Company also  has Knowledge of such breach or  inaccuracy.
Any  agreement on  the part of  a party hereto  to any such  extension or waiver
shall be valid only if set forth in an instrument in writing signed on behalf of
such party.  Any  such  extension or  waiver  shall  be effective  only  in  the
particular instance in which it is given.
 
                                   ARTICLE 12
 
                          SURVIVAL AND INDEMNIFICATION
12.1  INDEMNIFICATION BY THE COMPANY
 
    The  Company shall indemnify and hold harmless Protocol from and against and
shall reimburse Protocol with respect  to all Indemnifiable Damages incurred  by
Protocol by reason of or arising out of or in connection with the following:
 
    12.1.1   The breach or  inaccuracy of any representation  or warranty of the
Company contained in this Agreement.
 
    12.1.2  The  failure of  the Company to  perform any  agreement or  covenant
required by this Agreement to be performed by it.
 
    Notwithstanding  the  foregoing provisions  of  this Section  12.1,  (a) the
Company shall not be  liable for or  with respect to the  first $200,000 of  the
aggregate  of  Indemnifiable  Damages,  and  (b)  if  the  Merger  closes,  such
Indemnifiable Damages in excess  of such $200,000 amount  shall be recovered  by
Protocol solely in accordance with the provisions of the Escrow Agreement.
 
12.2  INDEMNIFICATION BY PROTOCOL
 
    Protocol  shall indemnify and hold harmless the Company from and against and
shall reimburse the Company  with respect to any  and all Indemnifiable  Damages
incurred by the Company by reason of or arising out of or in connection with the
following:
 
    12.2.1    The breach  or  inaccuracy of  any  representation or  warranty of
Protocol or Merger Sub contained in this Agreement.
 
    12.2.2   The  failure of  Protocol  to  perform any  agreement  or  covenant
required by this Agreement to be performed by it.
 
    Notwithstanding  the  foregoing provisions  of  this Section  12.2, Protocol
shall not be liable for or with  respect to the first $200,000 of the  aggregate
of Indemnifiable Damages.
 
12.3  SURVIVAL
 
    12.3.1    All  representations  and  warranties  made  by  Protocol  in this
Agreement and  any  liability  with  respect  thereto  shall  terminate  at  the
Effective Time.
 
                                      A-39
<PAGE>
    12.3.2   The representations and warranties of the Company and the indemnity
of the  Company under  Section 12.1  with respect  to such  representations  and
warranties  shall  survive  the Closing  as  obligations of  the  former Company
shareholders to be satisfied solely out of the Escrow Shares in accordance  with
the  Escrow Agreement (subject to the limitations  of this Article 12) and shall
terminate in all  respects on  the Termination Date  (as defined  in the  Escrow
Agreement),  as to all representations and  warranties except to the extent that
notice has been delivered  by Protocol in accordance  with the Escrow  Agreement
prior  to  the  Termination  Date  of  a breach  or  inaccuracy  of  any  of the
representations or warranties of  the Company, in which  case such notice  shall
continue  in effect until  such matters have  been resolved by  agreement of the
parties or  by a  final adjudication  of such  matters, not  subject to  further
appeal,  by a court with jurisdiction  over such matters. Under no circumstances
shall the Company or its shareholders have any liability whatsoever to  Protocol
or Merger Sub in excess of the Escrow Shares.
 
12.4  LIMITATIONS UPON INDEMNIFICATION
 
    The  indemnification rights of Protocol and Merger Sub, on the one hand, and
the Company, on the other hand, shall be subject to the following limitations:
 
    12.4.1  The  term "Indemnifiable  Damages" means  and includes  any and  all
losses,  damages  (including lost  profits  and punitive  damages), liabilities,
costs, and expenses (including reasonable attorney fees), but shall in no  event
include  consequential, indirect or speculative damages, or damages based upon a
multiple of lost (or anticipated) earnings, profits, income or the like.
 
    12.4.2   In computing  Indemnifiable Damages,  the amount  thereof shall  be
reduced  to take  into account  the net  tax benefit,  if any,  resulting to the
indemnified party  as a  consequence of  such party's  incurrence of  the  loss,
damage,  liability, cost or expense giving  rise to such claim for Indemnifiable
Damages.
 
    12.4.3   In computing  Indemnifiable Damages,  the amount  thereof shall  be
reduced  to take into account any amounts received by the indemnified party from
third Persons, including, without limitation, insurance proceeds.
 
                                   ARTICLE 13
 
                               GENERAL PROVISIONS
13.1  EXPENSES
 
    Each party shall bear its own  expenses, including the fees and expenses  of
any  attorneys,  accountants,  investment  bankers,  brokers,  finders  or other
intermediaries or other Persons engaged by  it, incurred in connection with  the
preparation,  negotiation and execution  of this Agreement  and the transactions
contemplated hereby. Protocol specifically acknowledges  that, if the Merger  is
consummated,  the Company will pay  all of the foregoing  fees incurred by or on
behalf of the Company,  and that no  portion thereof shall  be allocated to  the
Company's  shareholders,  or (subject  to any  claims by  Protocol based  upon a
breach of Section 5.28) charged in any manner against the Escrow Shares.
 
13.2  PUBLIC ANNOUNCEMENTS
 
    Protocol and  the Company  will agree  upon the  timing and  content of  the
initial  press release to be issued  describing the transactions contemplated by
this Agreement,  and will  not make  any public  announcement thereof  prior  to
reaching  such  agreement  unless  required  to  do  so  by  applicable  law  or
regulations (in  which  event, however,  the  party  so required  to  make  such
announcement  will endeavor in  advance to inform the  other party regarding the
reason and content thereof). To the extent reasonably requested by either party,
each party will hereafter consult with and provide reasonable cooperation to the
other in connection with the issuance of further press releases or other  public
documents describing the transactions contemplated by this Agreement.
 
                                      A-40
<PAGE>
13.3  NOTICES, ETC.
 
    All  notices,  requests,  demands  or other  communications  required  by or
otherwise with respect to this Agreement shall be in writing and shall be deemed
to have  been duly  given to  any party  when delivered  personally (by  courier
service  or  otherwise), when  delivered by  facsimile  and confirmed  by return
facsimile, or seven days after being mailed by first-class mail, postage prepaid
and return receipt requested in each case to the applicable addresses set  forth
below:
 
<TABLE>
<S>                                        <C>
IF TO THE COMPANY:                         WITH A COPY TO:
Daniel F. Carsten                          Robert J. Johannes
President and CEO                          Michael Best & Friedrich
Pryon Corporation                          100 E. Wisconsin Ave.
N93 W14575 Whittaker Way                   Milwaukie, WI 53202-4108
Menomonee Falls, WI 53051                  Telephone: (414) 271-6560
Telephone: (414) 253-2770                  Facsimile: (414) 277-0656
Facsimile: (414) 253-2772
 
IF TO PROTOCOL AND/OR MERGER SUB:          WITH A COPY TO:
James B. Moon                              Gregory E. Struxness
President and CEO                          Ater Wynne Hewitt Dodson & Skerritt
Protocol Systems, Inc.                     222 S.W. Columbia, Suite 1800
8500 S.W. Creekside Place                  Portland, OR 97201
Beaverton, OR 97008-7107                   Telephone: (503) 226-1191
Telephone: (503) 526-8500                  Facsimile: (503) 226-0079
Facsimile: (503) 526-4299
</TABLE>
 
or to such other address as such party shall have designated by notice so given
to each other party.
 
13.4  ATTORNEYS' FEES
 
    If a Proceeding is filed by any party to enforce this Agreement or otherwise
with  respect to the subject  matter of this Agreement,  the prevailing party or
parties shall  be entitled  to recover  reasonable attorneys'  fees incurred  in
connection  with such Proceeding as fixed by  the trial court, and if any appeal
is taken from  the decision of  the trial court,  reasonable attorneys' fees  as
fixed by the appellate court.
 
13.5  SEVERABILITY
 
    In  the  event that  any one  or more  of the  provisions contained  in this
Agreement shall be  invalid, illegal  or unenforceable  in any  respect for  any
reason, the validity, legality and enforceability of any such provision in every
other  respect and of the remaining provisions-of this Agreement shall not be in
any way impaired.
 
13.6  REMEDIES CUMULATIVE
 
    Except as otherwise provided in Article 12, all rights, powers and  remedies
provided under this Agreement or otherwise available in respect hereof at law or
in equity shall be cumulative and not alternative, and the exercise or beginning
of  the exercise of any  right, power of remedy by  any party shall not preclude
the simultaneous or later exercise of any  other such right, power or remedy  by
such party.
 
13.7  NO THIRD-PARTY BENEFICIARIES
 
    This  Agreement is not  intended to be for  the benefit of  and shall not be
enforceable by any Person or entity who or which is not a party hereto.
 
13.8  JURISDICTION
 
    Each party hereby irrevocably submits  to the exclusive jurisdiction of  the
United  States  District Court  for  the District  of  Oregon in  any Proceeding
arising in connection with this Agreement, and
 
                                      A-41
<PAGE>
agrees that any such Proceeding shall be brought only in such court (and  waives
any  objection based  on forum  non conveniens or  any other  objection to venue
therein); provided, however, that such consent to jurisdiction is solely for the
purpose referred to  in this Section  and shall not  be deemed to  be a  general
submission  to the jurisdiction of said courts or the State of Oregon other than
for such purpose.
 
13.9  GOVERNING LAW
 
    This Agreement and all disputes hereunder shall be governed by and construed
and enforced in  accordance with the  internal laws of  the State of  Wisconsin,
without regard to principles of conflict of laws.
 
13.10  ASSIGNMENT
 
    This Agreement shall be binding upon and inure to the benefit solely of each
party hereto, and their respective successors and assigns; provided that, except
as  otherwise expressly set forth in this  Agreement, neither the rights nor the
obligations of any party may be assigned or delegated without the prior  written
consent of the other party. Notwithstanding the foregoing, Merger Sub shall have
the  right to assign its rights and/or delegate its obligations hereunder to any
direct wholly-owned subsidiary of Protocol.
 
13.11  NAMES, CAPTIONS, ETC.
 
    The name assigned to this Agreement and the section captions used herein are
for convenience of  reference only and  shall not affect  the interpretation  or
construction  hereof.  Unless  otherwise  specified,  (a)  the  terms  "hereof,"
"herein" and similar terms refer to this Agreement as a whole and (b) references
herein to  "Articles"  or "Sections"  refer  to  articles or  sections  of  this
Agreement.
 
13.12  SCHEDULES
 
    The schedules referred to in this Agreement shall be the schedules described
as  such and initialed  by the parties  prior to execution  and delivery of this
Agreement.
 
13.13  EXHIBITS
 
    The following Exhibits  which are  attached hereto  are hereby  incorporated
into this Agreement by this reference:
 
<TABLE>
<CAPTION>
  EXHIBIT                        DESCRIPTION
- -----------  ----------------------------------------------------
<S>          <C>
4.6          Escrow Agreement
9.1.1        Voting Agreement
10.1.5(a)    Form of Pooling Opinion of Peat Marwick
10.1.5(b)    Form of Letter from Price Waterhouse, LLP
10.2.5       Form of Tax Opinion of Peat Marwick
10.2.12      Form of Opinion of Company Counsel
10.3.6       Form of Opinion of Protocol Counsel
</TABLE>
 
13.14  ENTIRE AGREEMENT
 
    This  Agreement  (including  the  Exhibits  and  Schedules  hereto  and  the
documents and instruments referred to  herein) constitutes the entire  agreement
and  supersedes all other prior agreements  and understandings, both written and
oral, among the  parties, or any  of them,  with respect to  the subject  matter
hereof (other than as provided in the Confidentiality Agreement).
 
13.15  COUNTERPARTS
 
    This  Agreement may be executed in any number of counterparts, each of which
shall be deemed to be  an original, but all  of which together shall  constitute
one  instrument. Each counterpart may consist of a number of copies, each signed
by less than all, but together signed by all, the parties hereto.
 
                                      A-42
<PAGE>
                           [SIGNATURES ON NEXT PAGE]
 
                                      A-43
<PAGE>
    IN WITNESS WHEREOF, this  Agreement has been executed  and delivered by  the
parties set forth below.
 
                                          PROTOCOL SYSTEMS, INC.
 
                                          By /s/ JAMES B. MOON
 
                                             -----------------------------------
                                             James B. Moon, President and CEO
 
                                          PROTOCOL MERGER CORPORATION
 
                                          By /s/ JAMES B. MOON
 
                                             -----------------------------------
                                             James B. Moon, President and CEO
 
                                          PRYON CORPORATION
 
                                          By /s/ DANIEL F. CARSTEN
 
                                             -----------------------------------
                                             Daniel F. Carsten, President and
                                             CEO
 
                                      A-44
<PAGE>
                                                                      APPENDIX B
 
February 20, 1996
 
Board of Directors
Protocol Systems, Inc.
 
Gentlemen:
 
    Protocol  Systems, Inc.  ("Protocol"), Protocol  Merger Corporation ("Merger
Sub"), a wholly-owned  subsidiary of  Protocol and  Pryon Corporation  ("Pryon")
have  entered  into an  Agreement and  Plan  of Merger  dated February  20, 1996
("Merger Agreement").  Pursuant to  the  Merger Agreement,  Merger Sub  will  be
merged with and into Pryon ("Merger"), which shall be the surviving corporation,
and  the separate existence of the Merger  Sub shall cease. The Merger Agreement
provides that  the shares  of  capital stock  of  Pryon issued  and  outstanding
immediately prior to the effective time of the Merger (the "Effective Time") and
options,  warrants and stock purchase rights to purchase shares of capital stock
of Pryon outstanding immediately prior to the Effective Time shall be  converted
into the right to receive an aggregate of 2,320,843 shares of Common Stock, $.01
par  value per  share ("Common  Stock"), of  Protocol subject  to adjustments as
provided in the Agreement (the  "Merger Consideration"). You have requested  our
opinion  as to whether the Merger Consideration to be paid by Protocol under the
Merger Agreement is fair, from a financial point of view, to Protocol.
 
    Wessels, Arnold & Henderson, L.L.C. ("Wessels"), as a customary part of  its
investment banking business, is engaged in the valuation of businesses and their
securities   in   connection   with   mergers   and   acquisitions,   negotiated
underwritings, private placements and valuations for estate, corporate and other
purposes. We  have acted  as financial  advisor  to the  Board of  Directors  of
Protocol  in connection with the transaction  described above and will receive a
fee for  our services.  We have  also acted  as co-managing  underwriter of  the
initial  public  offering  of  Protocol.  Wessels  regularly  publishes research
reports regarding  the  medical  instruments industry  and  the  businesses  and
securities  of  Protocol  and  other publicly  owned  companies  in  the medical
instruments industry.
 
    In preparing  our opinion,  Wessels  among other  things: (i)  reviewed  and
analyzed the financial terms of the Merger Agreement; (ii) reviewed and analyzed
certain financial and other information relating to Protocol and Pryon furnished
to  it  by  both  companies,  including  certain  internal  financial  and other
information prepared by  management; (iii) reviewed  certain publicly  available
information about Protocol and Pryon; (iv) held discussions with the managements
of  Protocol  and  Pryon  concerning the  business,  past  and  current business
operations,  financial  condition  and  future  prospects  of  both   companies,
including  certain information prepared by the management of Protocol concerning
potential cost savings  and synergies  that could  result from  the Merger;  (v)
reviewed  the financial performance of publicly traded companies which it deemed
comparable to Pryon; (vi) compared the financial terms of the Merger with  those
of  certain  merger transactions,  to the  extent  publicly available,  which it
deemed relevant; (vii) prepared discounted  cash flow analyses of Pryon;  (viii)
analyzed the pro forma earnings per share of the combined company; and (ix) made
such  other studies and  inquiries, and reviewed  such other data,  as it deemed
relevant.
 
    In the course of our  analysis we have, with  your consent, relied upon  the
accuracy  and completeness in  all material respects  and have not independently
verified the publicly available financial information, and non-public  financial
and  other information provided to  us by Protocol and  Pryon. We have not made,
requested or received  any independent  appraisal of the  assets or  liabilities
(contingent  or otherwise) of  Protocol or Pryon. With  respect to the financial
projections, estimates and analyses  provided to us, we  have assumed with  your
permission,  that such information  was reasonably prepared  on bases reflecting
the best currently available estimates and judgements of management as to future
financial performance.  Our opinion  is based  upon market,  economic and  other
circumstances existing and disclosed to us as of the date hereof.
 
                                      B-1
<PAGE>
    Based  upon and subject to the foregoing, it  is our opinion that, as of the
date of this  letter, the  Merger Consideration  to be  paid to  the holders  of
capital  stock  of  Pryon pursuant  to  the  Merger Agreement  is  fair,  from a
financial point of view, to Protocol.
 
Very truly yours,
 
WESSELS, ARNOLD & HENDERSON, L.L.C.
 
                                      B-2
<PAGE>
                                                                      APPENDIX C
 
                               DISSENTERS' RIGHTS
 
180.1301  DEFINITIONS.  In ss. 180.1301 to 180.1331:
 
    (1)  "Beneficial shareholder"  means a person  who is a  beneficial owner of
shares held by a nominee as the shareholder.
 
    (2) "Corporation" means the issuer  corporation or, if the corporate  action
giving  rise  to dissenters'  rights  under s.  180.1302  is a  merger  or share
exchange that  has  been  effectuated, the  surviving  domestic  corporation  or
foreign  corporation  of the  merger or  the  acquiring domestic  corporation or
foreign corporation of the share exchange.
 
    (3) "Dissenter"  means  a  shareholder  or  beneficial  shareholder  who  is
entitled  to dissent from  corporate action under s.  180.1302 and who exercises
that right when and in the manner required by ss. 180.1320 to 180.1328.
 
    (4) "Fair  value",  with respect  to  dissenter's  shares other  than  in  a
business  combination,  means the  value of  the  shares immediately  before the
effectuation of the corporate action  to which the dissenter objects,  excluding
any  appreciate or depreciation  in anticipation of  the corporate action unless
exclusion would  be inequitable.  "Fair value",  with respect  to a  dissenter's
shares  in  a  business  combination,  means  market  value,  as  defined  in s.
180.1130(9)(a) 1 to 4.
 
    (5) "Interest" means interest  from the effectuation  date of the  corporate
action  until the  date of payment,  at the  average rate currently  paid by the
corporation on its principal bank loans or, if none, at a rate that is fair  and
equitable under all of the circumstances.
 
    (6)  "Issuer corporation" means a domestic corporation that is the issuer of
the shares held by a dissenter before the corporate action.
 
180.1302  RIGHT TO DISSENT.
 
    (1) Except as  provided in  sub. (4) and  s. 180.1008(3),  a shareholder  or
beneficial shareholder may dissent from, and obtain payment of the fair value of
his or her shares in the event of, any of the following corporate actions:
 
        (a)  Consummation of a plan of merger to which the issuer corporation is
    a party if any of the following applies:
 
           1.  Shareholder approval is required for the merger by s.180.1103  or
       by the articles of incorporation.
 
           2.   The issuer corporation  is a subsidiary that  is merged with its
       parent under s.180.1104.
 
        (b) Consummation of a plan of share exchange if the issuer corporation's
    shares will  be acquired,  and the  shareholder or  the shareholder  holding
    shares  on behalf of the  beneficial shareholder is entitled  to vote on the
    plan.
 
        (c) Consummation of a sale or exchange of all, or substantially all,  of
    the  property of the issuer corporation other  than in the usual and regular
    course of business, including a sale  of dissolution, but not including  any
    of the following:
 
           1.  A sale pursuant to court order.
 
           2.   A sale for cash pursuant to a plan by which all or substantially
       all of  the  net  proceeds  of  the  sale  will  be  distributed  to  the
       shareholders within one year after the date of sale.
 
                                      C-1
<PAGE>
        (d)  Except as  provided in sub.  (2), any other  corporate action taken
    pursuant  to  a  shareholder  vote  to  the  extent  that  the  articles  of
    incorporation,  bylaws or  a resolution of  the board  of directors provides
    that the  voting  or nonvoting  shareholder  or beneficial  shareholder  may
    dissent and obtain payment for his or her shares.
 
    (2)  Except as  provided in  sub. (4)  and s.  180.1008(3), the  articles of
incorporation may allow a shareholder or beneficial shareholder to dissent  from
an  amendment of the  articles of incorporation  and obtain payment  of the fair
value of his  or her shares  if the amendment  materially and adversely  affects
rights in respect of a dissenter's shares because it does any of the following:
 
        (a) Alters or abolishes a preferential right of the shares.
 
        (b)  Creates,  alters or  abolishes a  right  in respect  of redemption,
    including a  provision  respecting a  sinking  fund for  the  redemption  or
    repurchase, of the shares.
 
        (c)  Alters or abolishes a  preemptive right of the  holder of shares to
    acquire shares or other securities.
 
        (d) Excludes or limits the right of the shares to vote on any matter  or
    to  cumulate votes, other than a  limitation by dilution through issuance of
    shares or other securities with similar voting rights.
 
        (e) Reduces the number of shares owned by the shareholder or  beneficial
    shareholder  to a fraction of a share  if the fractional share so created is
    to be acquired for cash under s. 180.0604.
 
    (3) Notwithstanding  sub. (1)(a)  to (c),  if the  issuer corporation  is  a
statutory close corporation under ss. 180.1801 to 180.1837, a shareholder of the
statutory  close  corporation may  dissent from  a  corporate action  and obtain
payment of the fair value  of his or her shares,  to the extent permitted  under
sub.  (1)(d) or  (2) or  s. 180.1803,  180.1813(1)(d) or  (2)(b), 180.1815(3) or
180.1829(1)(c).
 
    (4) Except in a business combination or unless the articles of incorporation
provide otherwise, subs. (1) and  (2) do not apply to  the holders of shares  of
any  class or series  if the shares of  the class or series  are registered on a
national securities exchange or quoted on the national association of securities
dealers, inc. automated quotations system on the record date fixed to  determine
the  shareholders  entitled  to  notice  of  a  shareholders'  meeting  at which
shareholders are to vote on the proposed corporate action.
 
    (5)  Except  as  provided  in  s.  180.1833,  a  shareholder  or  beneficial
shareholder  entitled to dissent and obtain payment  for his or her shares under
ss. 180.1301 to 180.1331 may not challenge the corporate action creating his  or
her  entitlement unless the action is unlawful or fraudulent with respect to the
shareholder, beneficial shareholder or issuer corporation.
 
180.1303  DISSENT BY SHAREHOLDERS AND BENEFICIAL SHAREHOLDERS.
 
    (1) A shareholder may assert dissenters' rights as to fewer than all of  the
shares  registered in  his or  her name  only if  the shareholder  dissents with
respect to all  shares beneficially  owned by any  one person  and notifies  the
corporation in writing of the name and address of each person on whose behalf he
or  she asserts dissenters' rights.  The rights of a  shareholder who under this
subsection asserts  dissenters'  rights as  to  fewer  than all  of  the  shares
registered  in his or her name are determined as if the shares as to which he or
she dissents  and his  or  her other  shares were  registered  in the  names  of
different shareholders.
 
    (2) A beneficial shareholder may assert dissenters' rights as to shares held
on  his  or  her behalf  only  if the  beneficial  shareholder does  all  of the
following:
 
        (a) Submits to the corporation the shareholder's written consent to  the
    dissent  not later  than the  time that  the beneficial  shareholder asserts
    dissenters' rights.
 
        (b) Submits the  consent under par.  (a) with respect  to all shares  of
    which he or she is the beneficial shareholder.
 
                                      C-2
<PAGE>
180.1320  NOTICE OF DISSENTERS' RIGHTS.
 
    (1)  If  proposed  corporate  action creating  dissenters'  rights  under s.
180.1302 is submitted to a vote  at a shareholders' meeting, the meeting  notice
shall state that shareholders and beneficial shareholders are or may be entitled
to  assert  dissenters'  rights under  ss.  180.1301  to 180.1331  and  shall be
accompanied by a copy of those sections.
 
    (2) If corporate  action creating  dissenters' rights under  s. 180.1302  is
authorized  without a  vote of  shareholders, the  corporation shall  notify, in
writing and in accordance with s. 180.0141, all shareholders entitled to  assert
dissenters'  rights that the action was authorized and send them the dissenters'
notice described in s. 180.1322.
 
180.1321  NOTICE OF INTENT TO DEMAND PAYMENT.
 
        (1) If proposed  corporate action creating  dissenters' rights under  s.
    180.1302 is submitted to a vote at a shareholders' meeting, a shareholder or
    beneficial  shareholder who wishes to assert dissenters' rights shall do all
    of the following:
 
           (a) Deliver  to  the issuer  corporation  before the  vote  is  taken
       written  notice that  complies with s.  180.0141 of  the shareholder's or
       beneficial shareholder's intent to demand  payment for his or her  shares
       if the proposed action is effectuated.
 
           (b) Not vote his or her shares in favor of the proposed action.
 
    (2) A shareholder or beneficial shareholder who fails to satisfy sub. (1) is
not entitled to payment for his or her shares under ss. 180.1301 to 180.1331.
 
180.1322  DISSENTERS NOTICE.
 
    (1)  If  proposed  corporate  action creating  dissenters'  rights  under s.
180.1302 is authorized at a shareholders' meeting, the corporation shall deliver
a written dissenters' notice to all shareholders and beneficial shareholders who
satisfied s. 180.1321.
 
    (2) The dissenters' notice  shall be sent  no later than  10 days after  the
corporate  action is authorized at a shareholders'  meeting or without a vote of
shareholders, whichever is applicable. The dissenters' notice shall comply  with
s. 180.0141 and shall include or have attached all of the following:
 
           (a)  A  statement  indicating  where  the  shareholder  or beneficial
       shareholder must send the payment demand and where and when  certificates
       for certificated shares must be deposited.
 
           (b)  For  holders of  uncertificated  shares, an  explanation  of the
       extent to  which transfer  of the  shares will  be restricted  after  the
       payment demand is received.
 
           (c)  A form for demanding payment that includes the date of the first
       announcement to  news  media or  to  shareholders  of the  terms  of  the
       proposed corporate action and that requires the shareholder or beneficial
       shareholder  asserting dissenters'  rights to  certify whether  he or she
       acquired beneficial ownership of the shares before that date.
 
           (d) A date by which the corporation must receive the payment  demand,
       which  may not be fewer than 30 days nor more than 60 days after the date
       on which the dissenters' notice is delivered.
 
           (e) A copy of ss. 180.1301 to 180.1331.
 
180.1323  DUTY TO DEMAND PAYMENT.
 
    (1) A shareholder or beneficial shareholder who is sent a dissenters' notice
described in s. 180.1322, or a beneficial shareholder whose shares are held by a
nominee who is sent a dissenters'  notice described in s. 180.1322, must  demand
payment in writing and certify whether he or she
 
                                      C-3
<PAGE>
acquired  beneficial ownership  of the shares  before the date  specified in the
dissenters'  notice  under  s.  180.1322(2)(c).  A  shareholder  or   beneficial
shareholder  with certificated shares must also  deposit his or her certificates
in accordance with the terms of the notice.
 
    (2) A shareholder  or beneficial  shareholder with  certificated shares  who
demands  payment  and deposits  his  or her  share  certificates under  sub. (1)
retains all other rights of a shareholder or beneficial shareholder until  these
rights are canceled or modified by the effectuation of the corporation action.
 
    (3)   A  shareholder   or  beneficial   shareholder  with   certificated  or
uncertificated shares  who  does not  demand  payment by  the  date set  in  the
dissenters' notice, or a shareholder or beneficial shareholder with certificated
shares  who does not deposit his or her share certificates where required and by
the date set in the  dissenters' notice, is not entitled  to payment for his  or
her shares under ss. 180.1301 to 180.1331.
 
180.1324  RESTRICTIONS ON UNCERTIFICATED SHARES.
 
    (1)  The  issuer corporation  may  restrict the  transfer  of uncertificated
shares from the date that  the demand for payment  for those shares is  received
until  the corporate action is effectuated or the restrictions released under s.
180.1326.
 
    (2) The shareholder or beneficial shareholder who asserts dissenters' rights
as to uncertificated  shares retains  all of the  rights of  the shareholder  or
beneficial  shareholder, other than those restricted under sub. (1), until these
rights are canceled or modified by the effectuation of the corporation action.
 
180.1325  PAYMENT.
 
    (1) Except as provided in  s. 180.1327, as soon  as the corporate action  is
effectuated  or  upon  receipt of  a  payment  demand, whichever  is  later, the
corporation shall  pay  each  shareholder  or  beneficial  shareholder  who  has
complied  with s. 180.1323 the  amount that the corporation  estimates to be the
fair value of his or her shares, plus accrued interest.
 
    (2) The payment shall be accompanied by all of the following:
 
        (a) The corporation's latest available financial statements, audited and
    including footnote disclosure if  available, but including  not less than  a
    balance  sheet as of the end of a fiscal year ending not more than 16 months
    before the date of payment, an  income statement for that year, a  statement
    of  changes in shareholders'  equity for that year  and the latest available
    interim financial statements, if any.
 
        (b) A statement of the corporation's  estimate of the fair value of  the
    shares.
 
        (c) An explanation of how the interest was calculated.
 
        (d)  A statement  of the  dissenter's right  to demand  payment under s.
    180.1328 if the dissenter is dissatisfied with the payment.
 
        (e) A copy of ss. 180.1301 to 180.1331.
 
180.1326  FAILURE TO TAKE ACTION.
 
    (1) If an issuer corporation does not effectuate the corporate action within
60 days after the date set under  s. 180.1322 for demanding payment, the  issuer
corporation  shall return  the deposited  certificates and  release the transfer
restrictions imposed on uncertificated shares.
 
    (2)  If  after  returning  deposited  certificates  and  releasing  transfer
restrictions  the  issuer  corporation  effectuates  the  corporate  action, the
corporation shall deliver a new dissenters' notice under s. 180.1322 and  repeat
the payment demand procedure.
 
                                      C-4
<PAGE>
180.1327  AFTER-ACQUIRED SHARES.
 
    (1) A corporation may elect to withhold payment required by s. 180.1325 from
a  dissenter unless the dissenter was the  beneficial owner of the shares before
the date specified in the dissenters' notice under s. 180.1322(2)(c) as the date
of the first announcement to news media  or to shareholders of the terms of  the
proposed corporate action.
 
    (2) To the extent that the corporation elects to withhold payment under sub.
(1) after effectuating the corporate action, it shall estimate the fair value of
the  shares, plus accrued interest, and shall  pay this amount to each dissenter
who agrees  to  accept  it in  full  satisfaction  of his  or  her  demand.  The
corporation  shall send with its  offer a statement of  its estimate of the fair
value of the shares, an  explanation of how the  interest was calculated, and  a
statement  of the dissenter's right  to demand payment under  s. 180.1328 if the
dissenter is dissatisfied with the offer.
 
180.1328  PROCEDURE IF DISSENTER DISSATISFIED WITH PAYMENT OF OFFER.
 
    (1) A  dissenter  may,  in the  manner  provided  in sub.  (2),  notify  the
corporation  of the dissenter's estimate of the  fair value of his or her shares
and amount of interest due, and demand payment of his or her estimate, less  any
payment  received under s. 180.1325,  or reject the offer  under s. 180.1327 and
demand payment of the fair value of his  or her shares and interest due, if  any
of the following applies:
 
        (a)  The dissenter  believes that the  amount paid under  s. 180.1325 or
    offered under s. 180.1327 is less than  the fair value of his or her  shares
    or that the interest due is incorrectly calculated.
 
        (b)  The corporation fails  to make payment under  s. 180.1325 within 60
    days after the date set under s. 180.1322 for demanding payment.
 
        (c) The issuer  corporation, having failed  to effectuate the  corporate
    action,  does not return the deposited  certificates or release the transfer
    restrictions imposed on uncertificated shares within 60 days after the  date
    set under s. 180.1322 for demanding payment.
 
    (2) A dissenter waives his or her right to demand payment under this section
unless  the dissenter notifies the  corporation of his or  her demand under sub.
(1) in writing within 30 days after the corporation made or offered payment  for
his or her shares. The notice shall comply with s. 180.0141.
 
180.1330  COURT ACTION.
 
    (1)  If  a  demand for  payment  under  s. 180.1328  remains  unsettled, the
corporation shall bring a special proceeding within 60 days after receiving  the
payment  demand under s. 180.1328  and petition the court  to determine the fair
value of the shares and accrued interest. If the corporation does not bring  the
special  proceeding within the 60-day period,  it shall pay each dissenter whose
demand remains unsettled the amount demanded.
 
    (2) The corporation shall bring the special proceeding in the circuit  court
for  the  county where  its  principal office  or, if  none  in this  state, its
registered office  is  located. If  the  corporation is  a  foreign  corporation
without a registered office in this state, it shall bring the special proceeding
in  the county in this  state in which was located  the registered office of the
issuer corporation that merged with or whose shares were acquired by the foreign
corporation.
 
    (3) The corporation shall make all  dissenters, whether or not residents  of
this  state, whose demands  remain unsettled parties  to the special proceeding.
Each party to the special proceeding shall be served with a copy of the petition
as provided in s. 801.14.
 
    (4) The jurisdiction of the court in which the special proceeding is brought
under sub. (2)  is plenary  and exclusive.  The court  may appoint  one or  more
persons as appraisers to receive evidence and recommend decision on the question
of  fair value. An appraiser has the power described in the order appointing him
or her or in any amendment to the order. The dissenters are entitled to the same
discovery rights as parties in other civil proceedings.
 
                                      C-5
<PAGE>
    (5) Each dissenter  made a party  to the special  proceeding is entitled  to
judgment for any of the following:
 
        (a)  The amount, if any, by which the  court finds the fair value of his
    or her shares, plus interest, exceeds the amount paid by the corporation.
 
        (b) The fair value, plus accrued interest, of his or her shares acquired
    on  or  after   the  date   specified  in  the   dissenter's  notice   under
    s.180.1322(2)(c),  for  which the  corporation  elected to  withhold payment
    under s. 180.1327.
 
180.1331  COURT COSTS AND COUNSEL FEES.
 
    (1) (a)  Notwithstanding ss.  814.01  to  814.04, the  court  in  a  special
             proceeding  brought under s. 180.1330  shall determine all costs of
             the proceeding, including the reasonable compensation and  expenses
             of  appraisers appointed  by the court  and shall  assess the costs
             against the corporation, except as provided in par. (b).
 
        (b) Notwithstanding ss. 814.01  and 814.04, the  court may assess  costs
    against all or some of the dissenters, in amounts that the court finds to be
    equitable,  to  the  extent  that  the  court  finds  the  dissenters  acted
    arbitrarily, vexatiously or not in good faith in demanding payment under  s.
    180.1328.
 
    (2)  The parties  shall bear  their own  expenses of  the proceeding, except
that, notwithstanding ss. 814.01 to 814.04,  the court may also assess the  fees
and  expenses of counsel and experts for the respective parties, in amounts that
the court finds to be equitable, as follows:
 
        (a) Against the corporation and in  favor of any dissenter if the  court
    finds that the corporation did not substantially comply with ss. 180.1320 to
    180.1328.
 
        (b)  Against the  corporation or  against a  dissenter, in  favor of any
    other party, if the  court finds that  the party against  whom the fees  and
    expenses  are assessed acted  arbitrarily, vexatiously or  not in good faith
    with respect to the rights provided by this chapter.
 
    (3) Notwithstanding  ss. 814.01  to  814.04, if  the  court finds  that  the
services of counsel and experts for any dissenter were of substantial benefit to
other  dissenters similarly situated,  the court may award  to these counsel and
experts reasonable fees to be paid out of the amounts awarded the dissenters who
were benefited.
 
                                      C-6


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