NATURAL MICROSYSTEMS CORP
8-K, EX-1.1, 2000-10-12
TELEPHONE & TELEGRAPH APPARATUS
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                                                                   Exhibit 1.1

                                                                EXECUTION COPY


                                  $175,000,000

                        NATURAL MICROSYSTEMS CORPORATION

                   5% Convertible Subordinated Notes due 2005

                     CONVERTIBLE DEBT UNDERWRITING AGREEMENT


                                                               October 5, 2000



DEUTSCHE BANK SECURITIES INC.
U.S. BANCORP PIPER JAFFRAY INC.
DAIN RAUSCHER INCORPORATED
As Representatives of the Several Underwriters
c/o Deutsche Bank Securities Inc.
One South Street
Baltimore, Maryland 21202

Ladies and Gentlemen:

         Natural MicroSystems Corporation, a Delaware corporation (the
"Company"), proposes to sell to the several underwriters (the "Underwriters")
named in Schedule I hereto for whom you are acting as representatives (the
"Representatives") an aggregate of $175,000,000 principal amount of the
Company's 5% Convertible Subordinated Notes due 2005 (the "Firm Securities").
The respective amounts of the Firm Securities to be so purchased by the several
Underwriters are set forth opposite their names in Schedule I hereto. The
Company also proposes to sell at the Underwriters' option an aggregate of up to
$26,250,000 additional principal amount of such Notes (the "Option Securities")
as set forth below. The Firm Securities and the Option Securities (to the extent
the aforementioned option is exercised) are herein collectively called the
"Securities."

         The Securities are convertible into shares of the Company's Common
Stock, par value $0.01 per share (the "Common Stock"). The Securities are to be
issued pursuant to the terms of an Indenture to be dated on or about October 11,
2000 (the "Initial Indenture") and the Supplemental Indenture thereto to be
dated on or about October 11, 2000 (the "Supplemental Indenture" and, together
with the Initial Indenture, the "Indenture"), between the Company

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and State Street Bank and Trust Company, as Trustee (the "Trustee"). If you are
the only Underwriters, all references herein to the Representatives shall be
deemed to be references to the Underwriters.

         As the Representatives, you have advised the Company (a) that you are
authorized to enter into this Agreement on behalf of the several Underwriters,
and (b) that the several Underwriters are willing, acting severally and not
jointly, to purchase the numbers of Firm Securities set forth opposite their
respective names in Schedule I, plus their pro rata portion of the Option
Securities if you elect to exercise the over-allotment option in whole or in
part for the accounts of the several Underwriters.

         In consideration of the mutual agreements contained herein and of the
interests of the parties in the transactions contemplated hereby, the parties
hereto agree as follows:

1.       REPRESENTATIONS AND WARRANTIES OF THE COMPANY. The Company represents
         and warrants to each of the Underwriters as follows:

         (a)      A registration statement on Form S-3 (File No. 333-44128) with
                  respect to the Securities and certain other securities of the
                  Company has been prepared by the Company in conformity with
                  the requirements of the Securities Act of 1933, as amended
                  (the "Act") and the Trust Indenture Act of 1939, as amended
                  (the "Trust Indenture Act"), and the Rules and Regulations
                  (the "Rules and Regulations") of the Securities and Exchange
                  Commission (the "Commission") thereunder and has been filed
                  with the Commission. The Company has complied with the
                  conditions for the use of Form S-3 and Rule 415 under the Act
                  and the registration statement filed by electronic
                  transmission pursuant to the Commission's Electronic Data
                  Gathering, Analysis and Retrieval System ("EDGAR") (except as
                  may be permitted by Regulation S-T under the Act) was
                  identical to the copy thereof delivered to you. Copies of such
                  registration statement, including any amendments thereto, the
                  preliminary prospectuses (meeting the requirements of the
                  Rules and Regulations) contained therein and the exhibits,
                  financial statements and schedules, as finally amended,
                  supplemented and revised, have heretofore been delivered by
                  the Company to you. Such registration statement, together with
                  any registration statement filed by the Company pursuant to
                  Rule 462(b) of the Act, herein referred to as the
                  "Registration Statement," has become effective under the Act
                  and no post-effective amendment to the Registration Statement
                  has been filed as of the date of this Agreement. The
                  prospectus included in the Registration Statement at the time
                  it became effective, as thereafter amended and supplemented,
                  is herein referred to as the "Base Prospectus." Each
                  preliminary prospectus supplement specifically relating to the
                  Securities filed with or transmitted for filing to, the
                  Commission pursuant to Rule 424(b) under the Act, which shall
                  include the Base Prospectus, is herein referred to as a
                  "Preliminary

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                  Prospectus." The prospectus supplement specifically relating
                  to the Securities and containing pricing information filed
                  with or transmitted for filing to, the Commission pursuant to
                  Rule 424(b) under the Act, which shall include the Base
                  Prospectus, is herein referred to as the "Prospectus." Any
                  reference herein to the Registration Statement, the Prospectus
                  or any Preliminary Prospectus shall be deemed to refer to and
                  include any documents incorporated by reference therein, and,
                  in the case of any reference herein to the Prospectus or any
                  Preliminary Prospectus, also shall be deemed to include any
                  documents incorporated by reference therein, and any
                  supplements or amendments thereto, filed with the Commission
                  after the date of filing of the Prospectus or Preliminary
                  Prospectus, as the case may be, under Rule 424(b) and prior to
                  the termination of the offering of the Securities by the
                  Underwriters.

         (b)      The Company has not distributed and will not distribute, prior
                  to the later of the Option Closing Date (as defined below) and
                  the completion of the Underwriters' distribution of the
                  Securities, any offering material in connection with the
                  offering and sale of the Securities other than the Preliminary
                  Prospectus, the Prospectus or the Registration Statement.

         (c)      This Agreement has been duly authorized, executed and
                  delivered by, and is a valid and binding agreement of, the
                  Company, enforceable against the Company in accordance with
                  its terms, except as rights to indemnification hereunder may
                  be limited by applicable law and except as the enforcement
                  hereof may be limited by bankruptcy, insolvency,
                  reorganization, moratorium or other similar laws relating to
                  or affecting the rights and remedies of creditors or by
                  general equitable principles.

         (d)      Each of the Initial Indenture and the Supplemental Indenture
                  has been duly authorized and on the Closing Date, each of the
                  Initial Indenture and Supplemental Indenture will be duly
                  executed and delivered by the Company and duly qualified under
                  the Trust Indenture Act and will constitute a valid and
                  legally binding instrument, enforceable against the Company in
                  accordance with its terms, except as the enforcement thereof
                  may be limited by bankruptcy, insolvency, reorganization,
                  moratorium or other similar laws relating to or affecting the
                  rights and remedies of creditors or by general equitable
                  principles.

         (e)      The Company has been duly organized and is validly existing as
                  a corporation in good standing under the laws of the State of
                  Delaware, with corporate power and authority to own or lease
                  its properties and conduct its business as described in the
                  Registration Statement and the Prospectus and to enter into
                  and perform its obligations under this Agreement, the
                  Indenture and Securities. Each of the subsidiaries of the
                  Company listed in Exhibit A hereto (collectively, the
                  "Subsidiaries") has been duly organized and is validly
                  existing as a corporation

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                  in good standing under the laws of the jurisdiction of its
                  incorporation, with corporate power and authority to own or
                  lease its properties and conduct its business as described in
                  the Registration Statement and the Prospectus. The
                  Subsidiaries are the only subsidiaries, direct or indirect, of
                  the Company and the Company does not own or control, directly
                  or indirectly, any corporation, association or other entity
                  other than the Subsidiaries. The Subsidiaries listed on
                  Exhibit B hereto (collectively, the "Significant
                  Subsidiaries") and the Company collectively generated more
                  than 98% of the pro forma combined consolidated revenue of the
                  Company and the Subsidiaries during the six months ended June
                  30, 2000, and currently own more than 98% of the consolidated
                  assets of the Company and the Subsidiaries. The Company and
                  each of the Subsidiaries are duly qualified to
                  transact business in all jurisdictions in which the conduct of
                  their business requires such qualification. The outstanding
                  shares of capital stock of each of the Subsidiaries have been
                  duly authorized and validly issued, are fully paid and
                  non-assessable and are owned by the Company or another
                  Subsidiary free and clear of all liens, encumbrances and
                  equities and claims; and no options, warrants or other rights
                  to purchase, agreements or other obligations to issue or other
                  rights to convert any obligations into shares of capital stock
                  or ownership interests in the Subsidiaries are outstanding.

         (f)      The outstanding shares of Common Stock of the Company have
                  been duly authorized and validly issued and are fully paid and
                  non-assessable. The shares of Common Stock initially issuable
                  upon conversion of the Securities (the "Conversion Shares")
                  have been duly authorized and reserved for issuance upon
                  conversion by all necessary corporate action of the Company
                  and, when issued upon conversion, will be validly issued,
                  fully paid and nonassessable. None of the outstanding shares
                  of Common Stock were issued in violation of any preemptive
                  rights, rights of first refusal or other rights to subscribe
                  for or purchase securities of the Company. There are no
                  authorized or outstanding options, warrants, preemptive
                  rights, rights of first refusal or other rights to purchase,
                  or equity or debt securities convertible into or exchangeable
                  or exercisable for, any capital stock of the Company or any of
                  the Subsidiaries other than those described in the
                  Registration Statement and the Prospectus. Neither the filing
                  of the Registration Statement nor the offering or sale of the
                  Securities as contemplated by this Agreement gives rise to any
                  rights, other than those which have been waived or satisfied,
                  for or relating to the registration of any shares of Common
                  Stock.

         (g)      The issuance and sale of the Securities by the Company have
                  been duly authorized and when executed, authenticated and
                  delivered to and paid for by the Underwriters in accordance
                  with the terms of this Agreement and the Indenture, the
                  Securities will be valid and legally binding obligations of
                  the

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                  Company, enforceable in accordance with their terms, and
                  entitled to the benefits provided by the Indenture; and no
                  preemptive rights of stockholders exist with respect to any of
                  the Securities or the Conversion Shares or the issue and sale
                  thereof.

         (h)      The Conversion Shares have been duly authorized and accepted
                  for listing on the Nasdaq National Market, subject to official
                  notice of issuance.

         (i)      The information set forth under the caption "Capitalization"
                  in the Prospectus is true and correct. The Securities and the
                  Conversion Shares conform to the description thereof contained
                  in the Registration Statement and the Prospectus. The form of
                  certificates for the Common Stock conforms to the corporate
                  law of the jurisdiction of the Company's incorporation.

         (j)      The Commission has not issued an order preventing or
                  suspending the use of any Prospectus relating to the proposed
                  offering of the Securities nor instituted proceedings for that
                  purpose. The Registration Statement contains, and the
                  Prospectus and any amendments or supplements thereto will
                  contain, all statements which are required to be stated
                  therein by, and will conform, to the requirements of the Act,
                  the Trust Indenture Act and the Rules and Regulations. The
                  documents incorporated by reference in the Registration
                  Statement and the Prospectus, at the time filed with the
                  Commission, conformed in all material respects to the
                  requirements of the Securities Exchange Act of 1934, as
                  amended (the "Exchange Act"), or the Act, as applicable, and
                  the rules and regulations of the Commission thereunder. The
                  Registration Statement and any amendments thereto do not
                  contain, and will not contain, any untrue statement of a
                  material fact and do not omit, and will not omit, to state any
                  material fact required to be stated therein or necessary to
                  make the statements therein not misleading. The Prospectus and
                  any amendments and supplements thereto do not contain, and
                  will not contain, any untrue statement of material fact; and
                  do not omit, and will not omit, to state any material fact
                  required to be stated therein or necessary to make the
                  statements therein, in the light of the circumstances under
                  which they were made, not misleading; provided, however, that
                  the Company makes no representations or warranties as (A) to
                  information contained in or omitted from the Prospectus, or
                  any such amendment or supplement thereto, in reliance upon,
                  and in conformity with, written information furnished to the
                  Company by or on behalf of any Underwriter through the
                  Representatives, specifically for use in the preparation
                  thereof or (B) to that part of the Registration Statement that
                  constitutes the Statement of Eligibility (Form T-1) under the
                  Trust Indenture Act.

         (k)      The consolidated financial statements of the Company and the
                  Subsidiaries, together with related notes and schedules as set
                  forth or incorporated by


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                  reference in the Registration Statement and the Prospectus,
                  present fairly the financial position and the results of
                  operations and cash flows of the Company and the consolidated
                  Subsidiaries, at the indicated dates and for the indicated
                  periods. The consolidated financial statements of
                  InnoMediaLogic (IML) Inc. ("IML") and its subsidiaries,
                  together with related notes and schedules as set forth or
                  incorporated by reference in the Registration Statement and
                  the Prospectus, present fairly the financial position and the
                  results of operations and cash flows of IML and its
                  subsidiaries at the indicated dates and for the indicated
                  periods. In each case, such financial statements and related
                  schedules have been prepared in accordance with generally
                  accepted accounting principles, consistently applied
                  throughout the periods involved, except as disclosed therein,
                  and all adjustments necessary for a fair presentation of
                  results for such periods have been made. The pro forma
                  financial statements and other pro forma financial information
                  included in the Registration Statement and the Prospectus
                  present fairly the information shown therein, have been
                  prepared in accordance with the Commission's rules and
                  guidelines with respect to pro forma financial statements,
                  have been properly compiled on the pro forma bases described
                  therein, and, in the opinion of the Company, the assumptions
                  used in the preparation thereof are reasonable and the
                  adjustments used therein are appropriate to give effect to the
                  transactions or circumstances referred to therein. No other
                  financial statements or supporting schedules are required to
                  be included in the Registration Statement or the Prospectus.
                  The summary financial and statistical data included or
                  incorporated by reference in the Registration Statement and
                  Prospectus presents fairly the information shown therein and
                  such data has been compiled on a basis consistent with the
                  financial statements presented therein and the books and
                  records of the Company.

         (l)      Each of PricewaterhouseCoopers LLP, Ernst & Young LLP and
                  Rochon Legault, who have certified certain of the financial
                  statements filed with the Commission as part of, or
                  incorporated by reference in, the Registration Statement and
                  the Prospectus, are independent public accountants as required
                  by the Act and the Rules and Regulations.

         (m)      Except as disclosed in the Prospectus, there is no action,
                  suit, claim or proceeding pending or, to the knowledge of the
                  Company, threatened against the Company or any of the
                  Subsidiaries before any court or administrative agency or
                  otherwise which if determined adversely to the Company or any
                  of its Subsidiaries might result in any material adverse
                  change in the earnings, business, management, properties,
                  assets, rights, operations, condition (financial or otherwise)
                  or prospects of the Company and of the Subsidiaries taken as a
                  whole or the Company's ability to perform its obligations
                  under this Agreement, the Securities or the Indenture.

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         (n)      The Company and the Subsidiaries have good and marketable
                  title to all of the properties and assets reflected in the
                  financial statements hereinabove described (or as described in
                  the Registration Statement and the Prospectus), and such
                  properties and assets are not subject to any lien, mortgage,
                  pledge, charge or encumbrance of any kind except those
                  reflected in such financial statements (or as described in the
                  Registration Statement and the Prospectus) or which are not
                  material, individually or in the aggregate, in amount. The
                  Company and the Subsidiaries occupy their leased properties
                  under valid and binding leases.

         (o)      The Company and the Subsidiaries have filed all federal,
                  state, local and foreign tax returns which have been required
                  to be filed and have paid all taxes indicated by said returns
                  and all assessments received by them or any of them to the
                  extent that such taxes have become due. All tax liabilities
                  have been adequately provided for in the financial statements
                  of the Company, and the Company does not know of any actual or
                  proposed additional material tax assessments.

         (p)      Since the respective dates as of which information is given in
                  the Registration Statement and the Prospectus, as they may be
                  amended or supplemented, there has not been any material
                  adverse change or any development involving a prospective
                  material adverse change in or affecting the earnings,
                  business, management, properties, assets, rights, operations,
                  condition (financial or otherwise), or prospects of the
                  Company and its Subsidiaries taken as a whole, whether or not
                  occurring in the ordinary course of business, and there has
                  not been any material transaction entered into or any material
                  transaction that is probable of being entered into by the
                  Company or any Subsidiary, other than transactions in the
                  ordinary course of business and changes and transactions
                  described in the Registration Statement and the Prospectus, as
                  they may be amended or supplemented. The Company and the
                  Subsidiaries have no material contingent obligations which are
                  not disclosed in the Company's financial statements and
                  described in the Registration Statement and the Prospectus.

         (q)      Neither the Company nor any of the Subsidiaries is or with the
                  giving of notice or lapse of time or both, will be, in
                  violation of or in default under its charter or by-laws or
                  under any agreement, lease, contract, indenture or other
                  instrument or obligation to which it is a party or by which
                  it, or any of its properties or assets, is bound and which
                  default is of material significance in respect of the
                  business, management, properties, assets, rights, operations,
                  condition (financial or otherwise) or prospects of the Company
                  and the Subsidiaries taken as a whole. The execution and
                  delivery of this Agreement, the Indenture and the Securities
                  and the consummation of the transactions herein and therein
                  contemplated and the fulfillment of the terms hereof and
                  thereof will not conflict with or result in a breach of any of
                  the terms or provisions of, or constitute a

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                  default under, any indenture, mortgage, deed of trust or other
                  agreement or instrument to which the Company or any Subsidiary
                  is a party or by which its properties or assets are bound, or
                  of the charter or by-laws of the Company or any order, rule or
                  regulation applicable to the Company or any Subsidiary of any
                  court or of any regulatory body or administrative agency or
                  other governmental body having jurisdiction.

         (r)      Each approval, consent, order, authorization, designation,
                  declaration or filing by or with any regulatory,
                  administrative or other governmental body necessary in
                  connection with the issue and sale of the Securities and the
                  execution and delivery by the Company of, and the performance
                  by the Company of its obligations under, this Agreement, the
                  Indenture and the Securities and the consummation of the
                  transactions herein and therein contemplated (except such
                  additional steps as may be required by the Commission, the
                  National Association of Securities Dealers, Inc. (the "NASD")
                  or such additional steps as may be necessary to qualify the
                  Securities for public offering by the Underwriters under state
                  securities or blue sky laws) has been obtained or made and is
                  in full force and effect.

         (s)      The Company and each of the Subsidiaries holds all material
                  licenses, certificates and permits from governmental
                  authorities which are necessary to the conduct of their
                  respective businesses and are in compliance with the terms
                  thereof, and all such licenses, certificates and permits are
                  in full force and effect.

         (t)      The Company and each of the Subsidiaries are conducting their
                  business in compliance with all the local, state, federal and
                  foreign laws, rules and regulations of the jurisdictions in
                  which the Company and each of the Subsidiaries are conducting
                  their respective businesses.

         (u)      The Company and the Subsidiaries own or possess sufficient
                  trademarks, trade names, service marks, patents, patent
                  rights, copyrights, licenses, approvals, inventions, know-how
                  (including trade secrets and other unpatented and/or
                  unpatentable proprietary or confidential information, systems
                  or procedures) and other similar rights and intellectual
                  property necessary to conduct their businesses as now
                  conducted and proposed to be conducted as described in the
                  Prospectus and have taken all steps reasonably necessary to
                  secure assignments of such intellectual property from their
                  employees and contractors; to the knowledge of the Company
                  none of the technology employed by the Company or its
                  Subsidiaries has been obtained or is being used by the Company
                  or its Subsidiaries in violation of any contractual or
                  fiduciary obligation binding on the Company, its Subsidiaries
                  or any of their respective directors or executive officers or,
                  to the Company's knowledge, any of their respective employees
                  or

<PAGE>

                  consultants; and the Company and its Subsidiaries have
                  taken and will maintain reasonable measures to prevent the
                  unauthorized dissemination or publication of its confidential
                  information.

                  The Company knows of no material infringement by others of
                  patents, patent rights, trade names, trademarks or copyrights
                  owned by or licensed to the Company. The Company has good and
                  marketable title to the patents and patent applications
                  referred to in the Registration Statement and the Prospectus.

                  Neither the Company nor any of the Subsidiaries has infringed,
                  interfered with or misappropriated any patents, patent rights,
                  trade names, trademarks, copyrights or other intellectual
                  property rights of others, which infringement, if the subject
                  of any unfavorable decision, ruling or finding would,
                  individually or in the aggregate, be reasonably likely to
                  result in a material adverse change in the earnings, business,
                  management, properties, assets, rights, operations, condition
                  (financial or otherwise) or prospects of the Company and the
                  Subsidiaries taken as a whole.

                  Except as disclosed in the Prospectus, to the Company's
                  knowledge, there are no legal or governmental proceedings
                  pending relating to trademarks, trade names, patent rights,
                  mask works, copyrights, licenses, trade secrets or other
                  intellectual property rights of the Company or any of the
                  Subsidiaries other than the prosecution by the Company and the
                  Subsidiaries of their patent applications before the United
                  States Patent Office and appropriate foreign government
                  agencies, and no proceedings are threatened or contemplated by
                  governmental authorities or others relating to trademarks,
                  trade names, patent rights, mask works, copyrights, licenses
                  or other intellectual property rights of the Company or the
                  Subsidiaries.

         (v)      Neither the Company nor, to the Company's knowledge, any of
                  its affiliates, has taken, directly or indirectly, any action
                  designed to cause or result in, or which has constituted or
                  which might reasonably be expected to constitute, the
                  stabilization or manipulation of the price of the shares of
                  Common Stock to facilitate the sale or resale of the
                  Securities. The Company acknowledges that the Underwriters may
                  engage in stabilizing and passive market making transactions
                  in the Common Stock on the Nasdaq National Market and in the
                  Securities in the open market and other activities in
                  accordance with Regulation M under the Exchange Act.

         (w)      Neither the Company nor any Subsidiary is, or after the
                  issuance and sale of, and the receipt of payment for, the
                  Securities and the application of the net proceeds therefrom
                  as described in the Registration Statement and the Prospectus
                  will be, an "investment company" or an entity "controlled" by
                  an

<PAGE>

                  "investment company" within the meaning of the Investment
                  Company Act of 1940, as amended (the "1940 Act"), and the
                  rules and regulations of the Commission thereunder.

         (x)      The Company maintains a system of internal accounting controls
                  sufficient to provide reasonable assurances that (i)
                  transactions are executed in accordance with management's
                  general or specific authorization; (ii) transactions are
                  recorded as necessary to permit preparation of financial
                  statements in conformity with generally accepted accounting
                  principles and to maintain accountability for assets; (iii)
                  access to assets is permitted only in accordance with
                  management's general or specific authorization; and (iv) the
                  recorded accountability for assets is compared with existing
                  assets at reasonable intervals and appropriate action is taken
                  with respect to any differences.

         (y)      The Company and its Subsidiaries, taken as a whole, carry, or
                  are covered by, insurance from recognized, financially sound
                  and reputable institutions in such amounts and covering such
                  risks as is adequate for the conduct of their businesses and
                  the value of their properties and as is customary for
                  companies engaged in similar industries.

         (z)      The Company is in compliance in all material respects with all
                  presently applicable provisions of the Employee Retirement
                  Income Security Act of 1974, as amended, including the
                  regulations and published interpretations thereunder
                  ("ERISA"); no "reportable event" (as defined in ERISA) has
                  occurred with respect to any "pension plan" (as defined in
                  ERISA) for which the Company would have any liability; the
                  Company has not incurred and does not expect to incur
                  liability under (i) Title IV of ERISA with respect to
                  termination of, or withdrawal from, any "pension plan" or (ii)
                  Sections 412 or 4971 of the Internal Revenue Code of 1986, as
                  amended, including the regulations and published
                  interpretations thereunder (the "Code"); and each "pension
                  plan" for which the Company would have any liability that is
                  intended to be qualified under Section 401(a) of the Code is
                  so qualified in all material respects and nothing has
                  occurred, whether by action or by failure to act, which would
                  cause the loss of such qualification.

         (aa)     To the Company's knowledge, there are no affiliations or
                  associations between any member of the NASD and any of the
                  Company's officers or directors.

         (bb)     Neither the Company nor any of its Subsidiaries nor, to the
                  Company's knowledge, any employee or agent of the Company or
                  any Subsidiary, has made any contribution or other payment to
                  any official of, or candidate for, any federal, state or
                  foreign office in violation of any law or of a character
                  required to be disclosed in the Prospectus.

<PAGE>

         (cc)     There are no costs or liabilities associated with applicable
                  foreign, federal, state and local laws and regulations
                  relating to the protection of human health and safety, the
                  environment or hazardous or toxic substances or wastes,
                  pollutants or contaminants ("Environmental Laws"), including,
                  without limitation, any capital or operating expenditures
                  required for clean-up, closure of properties or compliance
                  with Environmental Laws or any permit, license or approval,
                  any related constraints on operating activities and any
                  potential liabilities to third parties, which would be
                  reasonably expected, singly or in the aggregate, to have a
                  material adverse effect on the Company and the Subsidiaries,
                  taken as a whole.

         (dd)     The Company has reviewed its operations and that of its
                  Subsidiaries and any third parties with which the Company or
                  any of its Subsidiaries has a material relationship to
                  evaluate the extent to which the business or operations of the
                  Company or any of its Subsidiaries will be affected by the
                  Year 2000 Problem. As a result of such review, the Company has
                  no reason to believe, and does not believe, that the Year 2000
                  Problem will result in a material adverse change in the
                  earnings, business, management, properties, assets, rights,
                  operations, condition (financial or otherwise) or prospects of
                  the Company and of the Subsidiaries taken as a whole or result
                  in any material loss or interference with the Company's
                  business or operations. The "Year 2000 Problem" as used herein
                  means any significant risk that computer hardware or software
                  used in the receipt, transmission, processing, manipulation,
                  storage, retrieval, retransmission or other utilization of
                  data or in the operation of mechanical or electrical systems
                  of any kind will not, in the case of dates or time periods
                  occurring after December 31, 1999, function at least as
                  effectively as in the case of dates or time periods occurring
                  prior to January 1, 2000.

         (ee)     No event has occurred or is continuing which constitutes, or
                  with notice or lapse of time would constitute, an Event of
                  Default (as defined in the Indenture and the Securities).

         (ff)     Any certificate signed by an officer of the Company or any of
                  its Subsidiaries delivered to the Representatives or to
                  counsel for the Underwriters shall be deemed to be a
                  representation and warranty hereunder by the Company to each
                  Underwriter as to the matters covered thereby.

2.       PURCHASE, SALE AND DELIVERY OF THE FIRM SECURITIES.

         (a)      On the basis of the representations, warranties and covenants
                  herein contained and subject to the conditions herein set
                  forth, the Company agrees to sell to the Underwriters, and
                  each Underwriter agrees, severally and not jointly, to

<PAGE>

                  purchase, at a price of 97% of the principal amount thereof,
                  plus accrued interest, if any, from October 11, 2000 to the
                  Closing Date (as defined below), the principal amount of Firm
                  Securities set forth opposite the name of each Underwriter in
                  Schedule I hereof, subject to adjustments in accordance with
                  Section 9 hereof. The Securities will be convertible at the
                  option of the holder into shares of Common Stock at the
                  conversion price set forth in the Securities (the "Conversion
                  Price"), which Conversion Price is subject to adjustment in
                  certain events as provided in the Securities and the
                  Indenture. A global security representing the Firm Securities
                  shall be registered in the name of the nominee of the
                  Depository Trust Company ("DTC"), Cede & Co., credited to the
                  accounts of such of its participants as the Representatives
                  shall request, upon notice to the Company at least 48 hours
                  prior to the Closing Date, with any transfer taxes payable in
                  connection with the transfer of the Securities to the
                  Underwriters duly paid, and deposited with the Trustee as
                  custodian for DTC on the Closing Date, against payment by or
                  on behalf of the Underwriters to the account of the Company of
                  the aggregate purchase price therefor by wire transfer in
                  federal (same day) funds. Such payment and delivery are to be
                  made at 10:00 A.M., New York time, on the third business day
                  after the date of this Agreement, or at such other time and
                  date not later than five business days thereafter as you and
                  the Company shall agree upon, such time and date being
                  referred to as the "Closing Date." As used herein, "business
                  day" means a day on which the New York Stock Exchange is open
                  for trading and on which banks in New York are open for
                  business and are not permitted by law or executive order to be
                  closed.

         (b)      In addition, on the basis of the representations and
                  warranties herein contained and subject to the terms and
                  conditions herein set forth, the Company hereby grants an
                  option to the several Underwriters to purchase the Option
                  Securities at the same price as set forth in the first
                  paragraph of this Section 2 plus, if the purchase and sale of
                  any Option Securities takes place after the Closing Date, any
                  accrued interest from October 11, 2000. The option granted
                  hereby may be exercised in whole or in part by giving written
                  notice (i) at any time before the Closing Date and (ii) only
                  once thereafter within 30 days after the date of this
                  Agreement, by you, as Representatives of the several
                  Underwriters, to the Company setting forth the aggregate
                  principal amount of Option Securities as to which the several
                  Underwriters are exercising the option and the time and date
                  at which the Option Securities are to be delivered. The time
                  and date at which the Option Securities are to be delivered
                  shall be determined by the Representatives but shall not be
                  earlier than three nor later than ten full business days after
                  the exercise of such option, nor in any event prior to the
                  Closing Date (such time and date being herein referred to as
                  the "Option Closing Date"). If the date of exercise of the
                  option is three or more days before the Closing Date, the
                  notice of exercise shall set the Closing Date as the Option

<PAGE>

                  Closing Date. The principal amount of Option Securities to be
                  purchased by each Underwriter shall be in the same proportion
                  to the aggregate principal amount of Option Securities being
                  purchased as the principal amount of Firm Securities being
                  purchased by such Underwriter bears to the aggregate principal
                  amount of Firm Securities being sold hereunder, adjusted by
                  you in such manner as to avoid fractional interests. The
                  option with respect to the Option Securities granted hereunder
                  may be exercised to cover over-allotments in the sale of the
                  Firm Securities by the Underwriters and other transactions by
                  the Underwriters made in connection with the Securities. You,
                  as Representatives of the several Underwriters, may cancel
                  such option at any time prior to its expiration by giving
                  written notice of such cancellation to the Company. To the
                  extent, if any, that the option is exercised, payment and
                  delivery of the Option Securities shall be made in the same
                  manner, and upon the same terms and conditions, set forth in
                  paragraph (a) of this Section 2, except that reference therein
                  to the Firm Securities and the Closing Date shall be deemed,
                  for purposes of paragraph (b), to refer to such Option
                  Securities and Option Closing Date, respectively.

3. OFFERING BY THE UNDERWRITERS.

         It is understood that the several Underwriters are to make a public
offering of the Firm Securities as soon as the Representatives deem it advisable
to do so. The Firm Securities are to be initially offered to the public at the
initial public offering price set forth in the Prospectus. The Representatives
may from time to time thereafter change the public offering price and other
selling terms. To the extent, if at all, that any Option Securities are
purchased pursuant to Section 2 hereof, the Underwriters will offer them to the
public on the foregoing terms.

         It is further understood that you will act as the Representatives for
the Underwriters in the offering and sale of the Securities in accordance with a
Master Agreement Among Underwriters entered into by you and the several other
Underwriters.

4.       COVENANTS OF THE COMPANY. The Company covenants and agrees with the
         several Underwriters that:

         (a)      The Company will (A) use its best efforts to prepare and
                  timely file with the Commission under Rule 424(b) of the Rules
                  and Regulations a Prospectus that includes a prospectus
                  supplement specifically relating to the Securities and
                  containing pricing information in a form approved by the
                  Representatives, (B) not file any amendment to the
                  Registration Statement or supplement to the Prospectus of
                  which the Representatives shall not previously have been
                  advised and furnished with a copy or to which the
                  Representatives shall have reasonably objected in writing or
                  which is not in compliance with the Rules and

<PAGE>

                  Regulations, and (C) file on a timely basis all reports and
                  any definitive proxy or information statements required to be
                  filed by the Company with the Commission subsequent to the
                  date of the Prospectus and prior to the termination of the
                  offering of the Securities by the Underwriters.

         (b)      The Company will advise the Representatives promptly (A) of
                  any amendment or supplement to the Registration Statement or
                  the Prospectus and furnish the Representatives with copies
                  thereof, (B) of receipt of any comments from the Commission
                  relating to the Registration Statement or the Prospectus or
                  documents incorporated by reference therein, (C) of any
                  request of the Commission for amendment of the Registration
                  Statement or for supplement to the Prospectus or for any
                  additional information, and (D) of the issuance by the
                  Commission of any stop order suspending the effectiveness of
                  the Registration Statement or the use of the Prospectus or of
                  the institution of any proceedings for that purpose. The
                  Company will use its best efforts to prevent the issuance of
                  any such stop order preventing or suspending the use of the
                  Prospectus and to obtain as soon as possible the lifting
                  thereof, if issued.

         (c)      The Company will cooperate with the Representatives in
                  endeavoring to qualify the Securities for sale under the
                  securities laws of such jurisdictions as the Representatives
                  may reasonably have designated in writing and will make such
                  applications, file such documents, and furnish such
                  information as may be reasonably required for that purpose,
                  provided the Company shall not be required to qualify as a
                  foreign corporation or to file a general consent to service of
                  process in any jurisdiction where it is not now so qualified
                  or required to file such a consent. The Company will, from
                  time to time, prepare and file such statements, reports, and
                  other documents, as are or may be required to continue such
                  qualifications in effect for so long a period as the
                  Representatives may reasonably request for distribution of the
                  Securities.

         (d)      The Company will deliver to, or upon the order of, the
                  Representatives, from time to time, as many copies of any
                  Preliminary Prospectus as the Representatives may reasonably
                  request. The Company will deliver to, or upon the order of,
                  the Representatives during the period when delivery of a
                  Prospectus is required under the Act, as many copies of the
                  Prospectus in final form, or as thereafter amended or
                  supplemented, as the Representatives may reasonably request.
                  The Company will deliver to the Representatives at or before
                  the Closing Date, four signed copies of the Registration
                  Statement and all amendments thereto including all exhibits
                  filed therewith, and will deliver to the Representatives such
                  number of copies of the Registration Statement (including such
                  number of copies of the exhibits filed therewith that may
                  reasonably be requested), including documents incorporated by
                  reference therein, and of all amendments thereto, as the
                  Representatives may reasonably request.

<PAGE>

         (e)      The Company will comply with the Act and the Rules and
                  Regulations, the Exchange Act, and the rules and regulations
                  of the Commission thereunder, and the Trust Indenture Act and
                  the rules and regulations thereunder so as to permit the
                  completion of the distribution of the Securities as
                  contemplated in this Agreement, the Indenture and the
                  Prospectus. If during the period in which a prospectus is
                  required by law to be delivered by an Underwriter or dealer,
                  any event shall occur as a result of which, in the judgment of
                  the Company or in the reasonable opinion of the Underwriters,
                  it becomes necessary to amend or supplement the Prospectus in
                  order to make the statements therein, in the light of the
                  circumstances existing at the time the Prospectus is delivered
                  to a purchaser, not misleading, or, if it is necessary at any
                  time to amend or supplement the Prospectus to comply with any
                  law, the Company promptly will either (i) prepare and file
                  with the Commission an appropriate amendment to the
                  Registration Statement or supplement to the Prospectus or (ii)
                  prepare and file with the Commission an appropriate filing
                  under the Exchange Act which shall be incorporated by
                  reference in the Prospectus so that the Prospectus as so
                  amended or supplemented will not, in the light of the
                  circumstances when it is so delivered, be misleading, or so
                  that the Prospectus will comply with the law.

         (f)      The Company will make generally available to its security
                  holders, as soon as it is practicable to do so, but in any
                  event not later than 15 months after the effective date of the
                  Registration Statement, an earning statement (which need not
                  be audited) in reasonable detail, covering a period of at
                  least 12 consecutive months beginning after the effective date
                  of the Registration Statement, which earning statement shall
                  satisfy the requirements of Section 11(a) of the Act and Rule
                  158 of the Rules and Regulations and will advise you in
                  writing when such statement has been so made available.

         (g)      Prior to the Closing Date, the Company will furnish to the
                  Underwriters, as soon as they have been prepared by or are
                  available to the Company, a copy of any unaudited interim
                  financial statements of the Company for any period subsequent
                  to the period covered by the most recent financial statements
                  appearing in the Registration Statement and the Prospectus.

         (h)      No offering, sale, short sale or other disposition of any
                  shares of Common Stock of the Company or other securities
                  convertible into or exchangeable or exercisable for shares of
                  Common Stock or derivative of Common Stock (or agreement for
                  such) will be made for a period of 90 days after the date of
                  this Agreement, directly or indirectly, by the Company
                  otherwise than hereunder or with the prior written consent of
                  Deutsche Bank Securities Inc.; provided, however, that this
                  Section 4(h) shall not apply to (I) the sale of the Securities
                  to the Underwriters hereunder; (II) the issuance by the
                  Company of shares of

<PAGE>

                  Common Stock upon the exercise of an option or warrant or the
                  conversion of a security outstanding on the date hereof of
                  which Deutsche Bank Securities Inc. has been advised in
                  writing; or (III) the issuance of additional options under the
                  Company's existing stock option plans, provided that such
                  stock options are not exercisable during such 90 day period,
                  or additional shares of Common Stock under the Company's
                  existing employee stock purchase plan.

         (i)      The Company has caused the persons listed on Exhibit C hereto
                  to furnish to you, on or prior to the date of this Agreement,
                  a letter or letters, in substantially the form set forth in
                  Exhibit D hereto, pursuant to which each such person shall
                  agree not to offer, sell, sell short or otherwise dispose of
                  certain of the shares of Common Stock of the Company or other
                  capital stock of the Company, or other securities convertible,
                  exchangeable or exercisable for Common Stock or derivative of
                  Common Stock owned by such person or request the registration
                  for the offer or sale of any of the foregoing (or as to which
                  such person has the right to direct the disposition of) for
                  certain periods after the date of this Agreement, directly or
                  indirectly, except with the prior written consent of Deutsche
                  Bank Securities Inc. (the "Lockup Agreements").

         (j)      The Company shall apply the net proceeds of its sale of the
                  Securities as set forth in the Prospectus.

         (k)      The Company shall not invest, or otherwise use the proceeds
                  received by the Company from its sale of the Securities in
                  such a manner as would require the Company or any of the
                  Subsidiaries to register as an investment company under the
                  1940 Act.

         (l)      The Company will maintain a transfer agent and, if necessary
                  under the jurisdiction of incorporation of the Company, a
                  registrar for the Common Stock.

         (m)      The Company will reserve and keep available at all times, free
                  of preemptive rights, shares of Common Stock for the purpose
                  of enabling the Company to satisfy any obligations to issue
                  shares of its Common Stock upon conversion of the Securities.

         (n)      The Company will cause the shares of Common Stock issuable
                  upon conversion of the Securities to be duly included for
                  quotation on the Nasdaq National Market on or prior to the
                  Closing Date and ensure that the shares of Common Stock
                  issuable upon conversion of the Securities remain included for
                  quotation on the Nasdaq National Market following the Closing
                  Date.

         (o)      The Company will not take, and will use its best efforts to
                  cause its affiliates

<PAGE>

                  not to take, directly or indirectly, any action designed to
                  cause or result in, or that has constituted or might
                  reasonably be expected to constitute, the stabilization or
                  manipulation of the price of any securities of the Company.

5.       COSTS AND EXPENSES.

         The Company will pay all costs, expenses and fees incident to the
performance of the obligations of the Company under this Agreement, including,
without limiting the generality of the foregoing, the following: accounting fees
of the Company; the fees and disbursements of counsel for the Company; the cost
of printing and delivering to, or as requested by, the Underwriters copies of
the Registration Statement, Preliminary Prospectuses, the Prospectus, this
Agreement, the Underwriters' Selling Memorandum, if any, the Underwriters'
Invitation Letter, the Blue Sky Survey and any supplements or amendments
thereto; the filing fees of the Commission; the filing fees and expenses
(including legal fees and disbursements) incident to securing any required
review by the NASD of the terms of the sale of the Securities; all expenses
arising from the listing of the shares of Common Stock issuable upon conversion
of the Securities on the Nasdaq National Market; the fees and expenses of any
Trustee and any agent of any Trustee and the fees and disbursements of counsel
for any Trustee in connection with the Indenture and the Securities; the Listing
Fee of the Nasdaq National Market; and the expenses, including the fees and
disbursements of counsel for the Underwriters, incurred in connection with the
qualification of the Securities under state securities or blue sky laws. Any
transfer taxes imposed on the sale of the Securities to the several Underwriters
will be paid by the Company. The Company shall not, however, be required to pay
for any of the Underwriters expenses (other than those related to qualification
under NASD regulation and state securities or blue sky laws) except that, if
this Agreement shall not be consummated because the conditions in Section 6
hereof are not satisfied, or because this Agreement is terminated by the
Representatives pursuant to Section 11 hereof, or by reason of any failure,
refusal or inability on the part of the Company to perform any undertaking or
satisfy any condition of this Agreement or to comply with any of the terms
hereof on its part to be performed, unless such failure to satisfy said
condition or to comply with said terms be due to the default or omission of any
Underwriter, then the Company shall reimburse the several Underwriters for
reasonable out-of-pocket expenses, including fees and disbursements of counsel,
reasonably incurred in connection with investigating, marketing and proposing to
market the Securities or in contemplation of performing their obligations
hereunder; but the Company shall not in any event be liable to any of the
several Underwriters for damages on account of loss of anticipated profits from
the sale by them of the Securities.

6. CONDITIONS OF OBLIGATIONS OF THE UNDERWRITERS.

         The several obligations of the Underwriters to purchase the Firm
Securities on the Closing Date and the Option Securities, if any, on the Option
Closing Date are subject to the accuracy, as of the Closing Date or the Option
Closing Date, as the case may be, of the representations and warranties of the
Company contained herein, and to the performance by

<PAGE>

the Company of its covenants and obligations hereunder and to the following
additional conditions:

         (a)      The Registration Statement and all post-effective amendments
                  thereto shall have become effective and any and all filings
                  required by Rule 424 of the Rules and Regulations shall have
                  been made, and any request of the Commission for additional
                  information (to be included in the Registration Statement or
                  otherwise) shall have been disclosed to the Representatives
                  and complied with to their reasonable satisfaction. No stop
                  order suspending the effectiveness of the Registration
                  Statement, as amended from time to time, shall have been
                  issued and no proceedings for that purpose shall have been
                  taken or, to the knowledge of the Company, shall be
                  contemplated by the Commission and no injunction, restraining
                  order, or order of any nature by a federal or state court of
                  competent jurisdiction shall have been issued as of the
                  Closing Date or the Option Closing Date, as the case may be,
                  which would prevent the issuance of the Securities.

         (b)      The Representatives shall have received on the Closing Date or
                  the Option Closing Date, as the case may be, the opinion of
                  Choate, Hall & Stewart, counsel for the Company, dated the
                  Closing Date or the Option Closing Date, as the case may be,
                  addressed to the Underwriters (and stating that it may be
                  relied upon by counsel to the Underwriters) to the effect
                  that:

                  (i)   The Company has been duly organized and is validly
                        existing as a corporation in good standing under the
                        laws of the State of Delaware, with corporate power and
                        authority to own or lease its properties and conduct its
                        business as described in the Registration Statement and
                        the Prospectus; each of the Significant Subsidiaries has
                        been duly organized and is validly existing as a
                        corporation in good standing under the laws of the
                        jurisdiction of its incorporation, with corporate power
                        and authority to own or lease its properties and conduct
                        its business as described in the Registration Statement
                        and the Prospectus; the Company and each of the
                        Significant Subsidiaries are duly qualified to transact
                        business in all jurisdictions in which the conduct of
                        their business requires such qualification, or in which
                        the failure to qualify would have a materially adverse
                        effect upon the business of the Company and the
                        Subsidiaries taken as a whole; and the outstanding
                        shares of capital stock of each of the Significant
                        Subsidiaries have been duly authorized and validly
                        issued and are fully paid and non-assessable and are
                        owned of record and, to the knowledge of such counsel,
                        beneficially by the Company or a Subsidiary; and, to
                        such counsel's knowledge (A) the outstanding shares of
                        capital stock of each of the Significant Subsidiaries is
                        owned free and clear of all liens, encumbrances and
                        equities and claims, (B) there are no outstanding
                        securities convertible or

<PAGE>

                        exchangeable into or evidencing the right to purchase or
                        subscribe for any shares of capital stock of the
                        Significant Subsidiaries, and (C) there are no
                        outstanding or authorized options, warrants or rights of
                        any character obligating the Company or the Significant
                        Subsidiaries to issue any shares of any Significant
                        Subsidiary's capital stock or any securities convertible
                        or exchangeable into or evidencing the right to purchase
                        or subscribe for any shares of such stock.

                  (ii)  The Company has authorized and outstanding capital stock
                        as set forth in the column entitled "Historical" under
                        the caption "Capitalization" in the Prospectus; the
                        authorized shares of the Company's Common Stock have
                        been duly authorized; the outstanding shares of the
                        Company's Common Stock have been duly authorized and
                        validly issued and are fully paid and non-assessable;
                        the Conversion Shares have been duly and validly
                        authorized and reserved for issuance upon such
                        conversion and, when issued upon conversion, in
                        accordance with the terms of the Supplemental Indenture
                        will be validly issued, fully paid and nonassessable; no
                        preemptive rights of stockholders exist with respect to
                        any of the Securities or the Conversion Shares or the
                        issue or sale thereof.

                  (iii) The Securities have been duly authorized, executed,
                        issued and delivered by the Company authenticated by the
                        Trustee and, when paid for in accordance with the terms
                        thereof, will constitute valid and legally binding
                        obligations of the Company entitled to the benefits
                        provided by the Indenture, subject, as to enforcement,
                        to bankruptcy, insolvency, fraudulent transfer,
                        moratorium, reorganization and similar laws of general
                        applicability relating to or affecting creditors' rights
                        and general equity principles; and the Securities, the
                        Conversion Shares and the Indenture conform in all
                        material respects to the descriptions thereof in the
                        Prospectus;

                  (iv)  The Indenture has been duly authorized, executed and
                        delivered by the Company and, assuming the due
                        authorization, execution and delivery thereof by the
                        Trustee, constitutes a valid and legally binding
                        obligation of the Company, enforceable against the
                        Company in accordance with its terms, subject, as to its
                        binding nature and enforceability, to bankruptcy,
                        insolvency, fraudulent transfer, moratorium,
                        reorganization and similar laws of general applicability
                        relating to or affecting creditors' rights and to
                        general equity principles; and the Indenture has been
                        duly qualified under the Trust Indenture Act;

                  (v)   Except as described in or contemplated by the
                        Prospectus, to the knowledge of such counsel, there are
                        no outstanding securities of the

<PAGE>

                        Company convertible or exchangeable into or evidencing
                        the right to purchase or subscribe for any shares of
                        capital stock of the Company and there are no
                        outstanding or authorized options, warrants or rights of
                        any character obligating the Company to issue any shares
                        of its capital stock or any securities convertible or
                        exchangeable into or evidencing the right to purchase or
                        subscribe for any shares of such stock; and except as
                        described in the Prospectus, to the knowledge of such
                        counsel, no holder of any securities of the Company or
                        any other person has the right, contractual or
                        otherwise, which has not been satisfied or effectively
                        waived, to cause the Company to sell or otherwise issue
                        to them, or to permit them to underwrite the sale of,
                        any of the Securities or the right to have any Common
                        Stock or other securities of the Company included in the
                        Registration Statement or the right, as a result of the
                        filing of the Registration Statement, to require
                        registration under the Act of any shares of Common Stock
                        or other securities of the Company.

                  (vi)  The Registration Statement has become effective under
                        the Act and, to the knowledge of such counsel, no stop
                        order proceedings with respect thereto have been
                        instituted or are pending or threatened under the Act
                        and any required filing of any Preliminary Prospectus
                        and the Prospectus pursuant to Rule 424(b) has been made
                        in accordance Rule 424(b).

                  (vii) The Registration Statement, the Prospectus and each
                        amendment or supplement thereto and document
                        incorporated by reference therein comply as to form in
                        all material respects with the requirements of the Act,
                        the Exchange Act and the Trust Indenture Act, as
                        applicable, and the applicable rules and regulations
                        thereunder (except that such counsel need express no
                        opinion as to the financial statements and related
                        schedules included or incorporated by reference therein
                        or as to the part of the Registration Statement that
                        constitutes Form T-1). The conditions for use of Form
                        S-3 set forth in the General Instructions thereto and
                        for use of Rule 415 under the Act have been satisfied.

                 (viii) The statements (i) in the Company's Registration
                        Statement on Form 8- A dated February 17, 1994,
                        describing the Common Stock, (ii) in the Company's
                        Registration Statement on Form 8-A dated January 19,
                        1999, as amended on June 15, 1999, describing the
                        Company's preferred share purchase rights, and (iii) in
                        Item 15 of the Registration Statement, insofar as such
                        statements constitute a summary of documents referred to
                        therein or matters of law, fairly summarize in all
                        material respects the information called for with
                        respect to such documents and matters.

<PAGE>

                  (ix)  Such counsel does not know of any contracts or documents
                        required to be filed as exhibits to or incorporated by
                        reference in the Registration Statement or described in
                        the Registration Statement or the Prospectus which are
                        not so filed, incorporated by reference or described as
                        required, and such contracts and documents as are
                        summarized in the Registration Statement or the
                        Prospectus are fairly summarized in all material
                        respects.

                  (x)   Such counsel knows of no material legal or governmental
                        proceedings pending or threatened against the Company or
                        any of the Subsidiaries except as set forth in the
                        Prospectus.

                  (xi)  The execution and delivery of this Agreement, the
                        Indenture and the Securities and the consummation of the
                        transactions herein and therein contemplated do not and
                        will not conflict with or result in a breach of any of
                        the terms or provisions of, or constitute a default
                        under, the charter or by-laws of the Company, or any
                        agreement or instrument known to such counsel to which
                        the Company or any of the Subsidiaries is a party or by
                        which the Company or any of the Subsidiaries may be
                        bound.

                  (xii) This Agreement has been duly authorized, executed and
                        delivered by the Company.

                 (xiii) No approval, consent, order, authorization,
                        designation, declaration or filing by or with any
                        regulatory, administrative or other governmental body is
                        necessary in connection with the execution and delivery
                        of this Agreement, the Indenture and the Securities and
                        the consummation of the transactions herein and therein
                        contemplated (other than as may be required by the NASD
                        or as required by state securities and blue sky laws as
                        to which such counsel need express no opinion) except
                        such as have been obtained or made, specifying the same.

                  (xiv) The Company is not, and will not become, as a result of
                        the consummation of the transactions contemplated by
                        this Agreement and application of the net proceeds
                        therefrom as described in the Registration Statement and
                        the Prospectus, required to register as an investment
                        company under the 1940 Act.

                           In rendering such opinion Choate, Hall & Stewart may
                  rely as to matters governed by the laws of states other than
                  The Commonwealth of Massachusetts, the General Corporation Law
                  of the State of Delaware or federal laws on local counsel in
                  such jurisdictions, provided that in each case Choate, Hall &
                  Stewart

<PAGE>

                  shall state that they believe that they and the Underwriters
                  are justified in relying on such other counsel. In addition to
                  the matters set forth above, such opinion shall also include a
                  statement to the effect that nothing has come to the attention
                  of such counsel which leads them to believe that (i) the
                  Registration Statement, at the time it became effective under
                  the Act and as of the Closing Date or the Option Closing Date,
                  as the case may be, contained an untrue statement of a
                  material fact or omitted to state a material fact required to
                  be stated therein or necessary to make the statements therein
                  not misleading, and (ii) the Prospectus, or any supplement
                  thereto, as of its date and as of the Closing Date or the
                  Option Closing Date, as the case may be, contained an untrue
                  statement of a material fact or omitted to state a material
                  fact necessary in order to make the statements, in the light
                  of the circumstances under which they are made, not misleading
                  (except that such counsel need express no view as to financial
                  statements, schedules and statistical information included or
                  incorporated by reference therein or as to the part of the
                  Registration Statement that constitutes Form T-1). With
                  respect to such statement, Choate, Hall & Stewart may state
                  that their belief is based upon the procedures set forth
                  therein, but is without independent check and verification.

         (c)      The Representatives shall have received on the Closing Date or
                  the Option Closing Date, as the case may be, the opinion of
                  Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C.,
                  intellectual property counsel for the Company, dated the
                  Closing Date or the Option Closing Date, as the case may be,
                  addressed to the Underwriters (and stating that it may be
                  relied upon by counsel to the Underwriters) to the effect
                  that:

                  (i)   The statements in the portions of the Registration
                        Statement and the Prospectus headed: "Risk Factors -- We
                        may not be able to adequately protect our intellectual
                        property, which may facilitate the development of
                        competing products by others", "Risk Factors -- Our
                        products may infringe on the intellectual property
                        rights of third parties, which may result in lawsuits
                        and prohibit us from selling our products", "Business -
                        Intellectual Property and Proprietary Rights", and
                        "Legal Proceedings" (collectively, the "Intellectual
                        Property Portion"), insofar as such statements
                        constitute a summary of documents or proceedings
                        referred to therein or matters of law, are accurate
                        summaries and fairly and correctly present, in all
                        material respects, the information called for with
                        respect to such documents, proceedings and matters.

                  (ii)  Such counsel has no knowledge of any facts which would
                        preclude the Company from having clear title to its
                        patents or patent applications referenced in the
                        Intellectual Property Portion. To such counsel's
                        knowledge, the Company owns or possesses sufficient
                        licenses or other

<PAGE>

                        rights to use all trademarks, trade names, patents,
                        copyrights, licenses, trade secrets, know-how and other
                        intellectual property necessary to conduct the business
                        now conducted or proposed to be conducted by the Company
                        as described in the Prospectus and, to such counsel's
                        knowledge, the Company is in compliance in all material
                        respects with the terms of any such licenses or rights
                        and no claims, assertions or allegations with respect to
                        such licenses or rights have been made to the contrary,
                        except as disclosed in the Prospectus.

                  (iii) Except as disclosed in the Prospectus, to such counsel's
                        knowledge, there are no legal or governmental
                        proceedings pending relating to trademarks, trade names,
                        patents, patent applications, mask works, copyrights,
                        licenses, trade secrets or other intellectual property
                        rights which could result in any material adverse effect
                        upon the Company other than the prosecution by the
                        Company of its patent applications before the United
                        States Patent and Trademark Office and appropriate
                        foreign government agencies, and to such counsel's
                        knowledge no such proceedings have been threatened by
                        governmental authorities or others.

                  (iv)  Such counsel does not know of any contract or other
                        document relating to the Company's intellectual property
                        of a character required to be filed as an exhibit to the
                        Registration Statement or required to be described in
                        the Registration Statement or the Prospectus that has
                        not been filed or described as required.

                           In addition to the matters set forth above, such
                  opinion shall also include a statement to the effect that
                  nothing has come to the attention of such counsel which leads
                  them to believe that (i) the Intellectual Property Portion of
                  the Registration Statement, at the time the Registration
                  Statement became effective under the Act and as of the Closing
                  Date or the Option Closing Date, as the case may be, contained
                  an untrue statement of a material fact or omitted to state a
                  material fact required to be stated therein or necessary to
                  make the statements therein not misleading, and (ii) the
                  Intellectual Property Portion of the Prospectus, or any
                  supplement to the Prospectus, on the date such Prospectus or
                  supplement was filed pursuant to the Rules and Regulations and
                  as of the Closing Date or the Option Closing Date, as the case
                  may be, contained an untrue statement of a material fact or
                  omitted to state a material fact necessary in order to make
                  the statements, in the light of the circumstances under which
                  they are made, not misleading. With respect to such statement,
                  Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C. may state
                  that their belief is based upon the procedures set forth
                  therein, but is without independent check and verification.

<PAGE>

         (d)      The Representatives shall have received from Ropes & Gray,
                  counsel for the Underwriters, an opinion dated the Closing
                  Date or the Option Closing Date, as the case may be, with
                  respect to the incorporation of the Company, the validity of
                  the Securities delivered on the Closing Date or the Option
                  Closing Date, as the case may be, the Registration Statement,
                  the Prospectus and other related matters as the
                  Representatives may require, and the Company shall have
                  furnished to such counsel such documents as they request for
                  the purpose of enabling them to pass upon such matters. In
                  rendering such opinion, Ropes & Gray may rely as to all
                  matters governed other than by the laws of The Commonwealth of
                  Massachusetts, the General Corporation Law of the State of
                  Delaware, or federal laws on the opinions of counsel referred
                  to in Paragraph (b) and (c) of this Section 6. In addition to
                  the matters set forth above, such opinion shall also include a
                  statement to the effect that nothing has come to the attention
                  of such counsel which leads them to believe that (i) the
                  Registration Statement, or any amendment thereto, as of the
                  time it became effective under the Act as of the Closing Date
                  or the Option Closing Date, as the case may be, contained an
                  untrue statement of a material fact or omitted to state a
                  material fact required to be stated therein or necessary to
                  make the statements therein not misleading, and (ii) the
                  Prospectus, or any supplement thereto, on the date it was
                  filed pursuant to the Rules and Regulations and as of the
                  Closing Date or the Option Closing Date, as the case may be,
                  contained an untrue statement of a material fact or omitted to
                  state a material fact, necessary in order to make the
                  statements, in the light of the circumstances under which they
                  are made, not misleading (except that such counsel need
                  express no view as to financial statements, schedules and
                  statistical information included or incorporated by reference
                  therein or as to the part of the Registration Statement that
                  constitutes Form T-1). With respect to such statement, Ropes &
                  Gray may state that their belief is based upon the procedures
                  set forth therein, but is without independent check and
                  verification.

         (e)      The Representatives shall have received at or prior to the
                  Closing Date from Ropes & Gray a memorandum or summary, in
                  form and substance satisfactory to the Representatives, with
                  respect to the qualification for offering and sale by the
                  Underwriters of the Securities under the state securities or
                  blue sky laws of such jurisdictions as the Representatives may
                  reasonably have designated to the Company.

         (f)      You shall have received, (A) a letter of
                  PricewaterhouseCoopers LLP on each of the date hereof, the
                  Closing Date and the Option Closing Date, as the case may be,
                  dated the date hereof, the Closing Date or the Option Closing
                  Date, as the case may be, and (B) letters of Ernst & Young LLP
                  on the Closing Date, dated the date hereof and the Closing
                  Date, and a letter on the Option Closing Date dated the Option
                  Closing Date, in each case in form and substance

<PAGE>

                  satisfactory to you, confirming that they are independent
                  public accountants within the meaning of the Act and the
                  applicable Rules and Regulations thereunder and stating that
                  in their opinion the respective financial statements and
                  schedules examined by them and included in the Registration
                  Statement and the Prospectus comply as to form in all material
                  respects with the applicable accounting requirements of the
                  Act and the related published Rules and Regulations; and
                  containing such other statements and information as is
                  ordinarily included in accountants' "comfort letters" to
                  Underwriters with respect to the financial statements and
                  certain financial and statistical information contained in the
                  Registration Statement and the Prospectus.

         (g)      The Representatives shall have received on the Closing Date or
                  the Option Closing Date, as the case may be, a certificate or
                  certificates of the Chief Executive Officer and the Chief
                  Financial Officer of the Company to the effect that, as of the
                  Closing Date or the Option Closing Date, as the case may be,
                  each of them severally represents as follows:

                  (i)      The Registration Statement has become effective under
                           the Act and no stop order suspending the
                           effectiveness of the Registration Statement or the
                           use of the Prospectus has been issued, and no
                           proceedings for such purpose have been taken or are,
                           to his knowledge, contemplated by the Commission;

                  (ii)     The representations and warranties of the Company
                           contained in Section 1 hereof are true and correct as
                           of the Closing Date or the Option Closing Date, as
                           the case may be;

                  (iii)    All filings required to have been made pursuant to
                           Rule 424 under the Act have been made;

                  (iv)     The Company has complied with all the agreements and
                           satisfied all the conditions on its part to be
                           performed or satisfied at or prior to such closing
                           date;

                  (v)      He has carefully examined the Registration Statement
                           and the Prospectus and, in his opinion, as of the
                           effective date of the Registration Statement and the
                           date of the Prospectus, the statements contained in
                           the Registration Statement and the Prospectus,
                           respectively, were true and correct, and such
                           Registration Statement and Prospectus did not omit to
                           state a material fact required to be stated therein
                           or necessary in order to make the statements therein
                           not misleading, and since the effective date of the
                           Registration Statement and the date of the
                           Prospectus, no event has occurred which should have
                           been set forth in a post-effective

<PAGE>

                           amendment to the Registration Statement or in a
                           supplement to or an amendment of the Prospectus which
                           has not been so set forth in such post-effective
                           amendment or supplement or amendment, as the case may
                           be; and

                  (vi)     Since the respective dates as of which information is
                           given in the Registration Statement and the
                           Prospectus, there has not been any material adverse
                           change or any development involving a prospective
                           material adverse change in or affecting the
                           condition, financial or otherwise, of the Company and
                           its Subsidiaries taken as a whole or the earnings,
                           business, management, properties, assets, rights,
                           operations, condition (financial or otherwise) or
                           prospects of the Company and the Subsidiaries taken
                           as a whole, whether or not arising in the ordinary
                           course of business.

         (h)      On each of the Closing Date and the Option Closing Date, if
                  any, the Representatives shall have received a certificate or
                  certificates of the Secretary of the Company in form and
                  substance reasonably satisfactory to the Representatives.

         (i)      The Company shall have furnished to the Representatives such
                  further certificates and documents confirming the
                  representations and warranties, covenants and conditions
                  contained herein and related matters as the Representatives
                  may reasonably have requested.

         (j)      The Lockup Agreements described in Section 4(i) shall be in
                  full force and effect.

         (k)      The Company and the Trustee shall have executed (i) the
                  Initial Indenture in a form substantially similar to the form
                  filed as an exhibit to the Registration Statement and (ii) the
                  Supplemental Indenture in the form previously furnished to the
                  Representatives, with such changes as are reasonably requested
                  by the Representatives and otherwise in form and substance
                  reasonably satisfactory to the Representatives.

         The opinions and certificates mentioned in this Agreement shall be
deemed to be in compliance with the provisions hereof only if they are in all
material respects satisfactory to the Representatives and to Ropes & Gray,
counsel for the Underwriters.

         If any of the conditions hereinabove provided for in this Section 6
shall not have been fulfilled when and as required by this Agreement to be
fulfilled, the obligations of the Underwriters hereunder may be terminated by
the Representatives by notifying the Company of such termination in writing, by
telecopy or by telegram at or prior to the Closing Date or

<PAGE>

the Option Closing Date, as the case may be.

         In such event, the Company and the Underwriters shall not be under any
obligation to each other (except to the extent provided in Sections 5 and 8
hereof).

7. CONDITIONS OF THE OBLIGATIONS OF THE COMPANY.

         The obligations of the Company to sell and deliver the portion of the
Securities required to be delivered as and when specified in this Agreement are
subject to the conditions that at the Closing Date or the Option Closing Date,
as the case may be, no stop order suspending the effectiveness of the
Registration Statement or the use of the Prospectus, shall have been issued and
in effect or proceedings therefor initiated or threatened.

8.       INDEMNIFICATION.

         (a)      The Company agrees:

                  (i)      to indemnify and hold harmless each Underwriter and
                           each person, if any, who controls any Underwriter
                           within the meaning of the Act, against any losses,
                           claims, damages or liabilities to which such
                           Underwriter or any such controlling person may become
                           subject under the Act or otherwise, insofar as such
                           losses, claims, damages or liabilities (or actions or
                           proceedings in respect thereof) arise out of or are
                           based upon (A) any untrue statement or alleged untrue
                           statement of any material fact contained in the
                           Registration Statement, any Preliminary Prospectus,
                           the Prospectus or any amendment or supplement
                           thereto, (B) the omission or alleged omission to
                           state therein a material fact required to be stated
                           therein or necessary to make the statements therein
                           not misleading, or (C) any act or failure to act or
                           any alleged act or failure to act by any Underwriter
                           in connection with, or relating in any manner to, the
                           Securities or the offering contemplated hereby, and
                           which is included as part of or referred to in any
                           loss, claim, damage, liability or action arising out
                           of or based upon matters covered by clause (A) or (B)
                           above (PROVIDED, that the Company shall not be liable
                           under this clause (C) to the extent that it is
                           determined in a final judgment by a court of
                           competent jurisdiction that such loss, claim, damage,
                           liability or action resulted directly from any such
                           acts or failures to act undertaken or omitted to be
                           taken by such Underwriter through its gross
                           negligence or willful misconduct); provided, however,
                           that the Company will not be liable in any such case
                           to the extent that any such loss, claim, damage or
                           liability arises out of or is based upon an untrue
                           statement or alleged untrue statement, or omission or
                           alleged omission made in any Preliminary Prospectus,
                           the Prospectus, or such amendment or

<PAGE>

                           supplement thereto, in reliance upon and in
                           conformity with written information furnished to the
                           Company by or through the Representatives
                           specifically for use in the preparation thereof.

                  (ii)     to reimburse each Underwriter and each such
                           controlling person upon demand for any legal or other
                           out-of-pocket expenses reasonably incurred by such
                           Underwriter or such controlling person in connection
                           with investigating or defending any such loss, claim,
                           damage or liability, action or proceeding or in
                           responding to a subpoena or governmental inquiry
                           related to the offering of the Securities, whether or
                           not such Underwriter or controlling person is a party
                           to any action or proceeding. In the event that it is
                           finally judicially determined that the Underwriters
                           were not entitled to receive payments for legal and
                           other expenses pursuant to this subparagraph, the
                           Underwriters will promptly return all sums that had
                           been advanced pursuant hereto.

         (b)      Each Underwriter severally and not jointly will indemnify and
                  hold harmless the Company, each of its directors, each of its
                  officers who have signed the Registration Statement and each
                  person, if any, who controls the Company within the meaning of
                  the Act, against any losses, claims, damages or liabilities to
                  which the Company or any such director, officer, or
                  controlling person may become subject under the Act or
                  otherwise, insofar as such losses, claims, damages or
                  liabilities (or actions or proceedings in respect thereof)
                  arise out of or are based upon (i) any untrue statement or
                  alleged untrue statement of any material fact contained in any
                  Preliminary Prospectus, the Prospectus or any amendment or
                  supplement thereto, or (ii) the omission or the alleged
                  omission to state therein a material fact required to be
                  stated therein or necessary to make the statements therein not
                  misleading in the light of the circumstances under which they
                  were made; and will reimburse any legal or other expenses
                  reasonably incurred by the Company or any such director,
                  officer, or controlling person in connection with
                  investigating or defending any such loss, claim, damage,
                  liability, action or proceeding; provided, however, that each
                  Underwriter will be liable in each case to the extent, but
                  only to the extent, that such untrue statement or alleged
                  untrue statement or omission or alleged omission has been made
                  in any Preliminary Prospectus, the Prospectus or such
                  amendment or supplement, in reliance upon and in conformity
                  with written information furnished to the Company by or
                  through the Representatives specifically for use in the
                  preparation thereof. This indemnity agreement will be in
                  addition to any liability which such Underwriter may otherwise
                  have.

         (c)      In case any proceeding (including any governmental
                  investigation) shall be instituted involving any person in
                  respect of which indemnity may be sought pursuant to this
                  Section 8, such person (the "indemnified party") shall
                  promptly

<PAGE>

                  notify the person against whom such indemnity may be sought
                  (the "indemnifying party") in writing. No indemnification
                  provided for in Section 8(a) or (b) shall be available to any
                  party who shall fail to give notice as provided in this
                  Section 8(c) if the party to whom notice was not given was
                  unaware of the proceeding to which such notice would have
                  related and was materially prejudiced by the failure to give
                  such notice, but the failure to give such notice shall not
                  relieve the indemnifying party or parties from any liability
                  which it or they may have to the indemnified party for
                  contribution or otherwise than on account of the provisions of
                  Section 8(a) or (b). In case any such proceeding shall be
                  brought against any indemnified party and it shall notify the
                  indemnifying party of the commencement thereof, the
                  indemnifying party shall be entitled to participate therein
                  and, to the extent that it shall wish, jointly with any other
                  indemnifying party similarly notified, to assume the defense
                  thereof, with counsel satisfactory to such indemnified party
                  and shall pay as incurred the fees and disbursements of such
                  counsel related to such proceeding. In any such proceeding,
                  any indemnified party shall have the right to retain its own
                  counsel at its own expense. Notwithstanding the foregoing, the
                  indemnifying party shall pay as incurred (or within 30 days of
                  presentation) the fees and expenses of the counsel retained by
                  the indemnified party in the event (i) the indemnifying party
                  and the indemnified party shall have mutually agreed to the
                  retention of such counsel, (ii) the named parties to any such
                  proceeding (including any impleaded parties) include both the
                  indemnifying party and the indemnified party and
                  representation of both parties by the same counsel would be
                  inappropriate due to actual or potential differing interests
                  between them, or (iii) the indemnifying party shall have
                  failed to assume the defense and employ counsel acceptable to
                  the indemnified party within a reasonable period of time after
                  notice of commencement of the action. It is understood that
                  the indemnifying party shall not, in connection with any
                  proceeding or related proceedings in the same jurisdiction, be
                  liable for the reasonable fees and expenses of more than one
                  separate firm for all such indemnified parties. Such firm
                  shall be designated in writing by you in the case of parties
                  indemnified pursuant to Section 8(a) and by the Company in the
                  case of parties indemnified pursuant to Section 8(b). The
                  indemnifying party shall not be liable for any settlement of
                  any proceeding effected without its written consent but if
                  settled with such consent or if there be a final judgment for
                  the plaintiff, the indemnifying party agrees to indemnify the
                  indemnified party from and against any loss or liability by
                  reason of such settlement or judgment. In addition, the
                  indemnifying party will not, without the prior written consent
                  of the indemnified party, settle or compromise or consent to
                  the entry of any judgment in any pending or threatened claim,
                  action or proceeding of which indemnification may be sought
                  hereunder (whether or not any indemnified party is an actual
                  or potential party to such claim, action or proceeding) unless
                  such settlement, compromise or consent includes an
                  unconditional release of each

<PAGE>

                  indemnified party from all liability arising out of such
                  claim, action or proceeding and does not include a statement
                  as to or an admission of fault, culpability or a failure to
                  act by or on behalf of any indemnified party.

         (d)      If the indemnification provided for in this Section 8 is
                  unavailable to or insufficient to hold harmless an indemnified
                  party under Section 8(a) or (b) above in respect of any
                  losses, claims, damages or liabilities (or actions or
                  proceedings in respect thereof) referred to therein, then each
                  indemnifying party shall contribute to the amount paid or
                  payable by such indemnified party as a result of such losses,
                  claims, damages or liabilities (or actions or proceedings in
                  respect thereof) in such proportion as is appropriate to
                  reflect the relative benefits received by the Company on the
                  one hand and the Underwriters on the other from the offering
                  of the Securities. If, however, the allocation provided by the
                  immediately preceding sentence is not permitted by applicable
                  law then each indemnifying party shall contribute to such
                  amount paid or payable by such indemnified party in such
                  proportion as is appropriate to reflect not only such relative
                  benefits but also the relative fault of the Company on the one
                  hand and the Underwriters on the other in connection with the
                  statements or omissions which resulted in such losses, claims,
                  damages or liabilities, (or actions or proceedings in respect
                  thereof), as well as any other relevant equitable
                  considerations. The relative benefits received by the Company
                  on the one hand and the Underwriters on the other shall be
                  deemed to be in the same proportion as the total net proceeds
                  from the offering (before deducting expenses) received by the
                  Company bear to the total underwriting discounts and
                  commissions received by the Underwriters, in each case as set
                  forth in the table on the cover page of the Prospectus. The
                  relative fault shall be determined by reference to, among
                  other things, whether the untrue or alleged untrue statement
                  of a material fact or the omission or alleged omission to
                  state a material fact relates to information supplied by the
                  Company on the one hand or the Underwriters on the other and
                  the parties' relative intent, knowledge, access to information
                  and opportunity to correct or prevent such statement or
                  omission.

                  The Company and the Underwriters agree that it would not be
                  just and equitable if contributions pursuant to this Section
                  8(d) were determined by pro rata allocation (even if the
                  Underwriters were treated as one entity for such purpose) or
                  by any other method of allocation which does not take account
                  of the equitable considerations referred to above in this
                  Section 8(d). The amount paid or payable by an indemnified
                  party as a result of the losses, claims, damages or
                  liabilities (or actions or proceedings in respect thereof)
                  referred to above in this Section 8(d) shall be deemed to
                  include any legal or other expenses reasonably incurred by
                  such indemnified party in connection with investigating or
                  defending any such action or claim. Notwithstanding the
                  provisions of this subsection (d), (i) no Underwriter shall be
                  required to contribute any amount in

<PAGE>

                  excess of the underwriting discounts and commissions
                  applicable to the Securities purchased by such Underwriter,
                  and (ii) no person guilty of fraudulent misrepresentation
                  (within the meaning of Section 11(f) of the Act) shall be
                  entitled to contribution from any person who was not guilty of
                  such fraudulent misrepresentation. The Underwriters'
                  obligations in this Section 8(d) to contribute are several in
                  proportion to their respective underwriting obligations and
                  not joint.

         (e)      In any proceeding relating to the Registration Statement, any
                  Preliminary Prospectus, the Prospectus or any supplement or
                  amendment thereto, each party against whom contribution may be
                  sought under this Section 8 hereby consents to the
                  jurisdiction of any court having jurisdiction over any other
                  contributing party, agrees that process issuing from such
                  court may be served upon him or it by any other contributing
                  party and consents to the service of such process and agrees
                  that any other contributing party may join him or it as an
                  additional defendant in any such proceeding in which such
                  other contributing party is a party.

         (f)      Any losses, claims, damages, liabilities or expenses for which
                  an indemnified party is entitled to indemnification or
                  contribution under this Section 8 shall be paid by the
                  indemnifying party to the indemnified party as such losses,
                  claims, damages, liabilities or expenses are incurred. The
                  indemnity and contribution agreements contained in this
                  Section 8 and the representations and warranties of the
                  Company set forth in this Agreement shall remain operative and
                  in full force and effect, regardless of (i) any investigation
                  made by or on behalf of any Underwriter or any person
                  controlling any Underwriter, the Company, its directors or
                  officers or any persons controlling the Company, (ii)
                  acceptance of any Securities and payment therefor hereunder,
                  and (iii) any termination of this Agreement. A successor to
                  any Underwriter, or to the Company, its directors or officers,
                  or any person controlling the Company, shall be entitled to
                  the benefits of the indemnity, contribution and reimbursement
                  agreements contained in this Section 8.

9.       DEFAULT BY UNDERWRITERS.

         If on the Closing Date or the Option Closing Date, as the case may be,
any Underwriter shall fail to purchase and pay for the portion of the Securities
which such Underwriter has agreed to purchase and pay for on such date
(otherwise than by reason of any default on the part of the Company), you, as
Representatives of the Underwriters, shall use your reasonable efforts to
procure within 36 hours thereafter one or more of the other Underwriters, or any
others, to purchase from the Company such amounts as may be agreed upon and upon
the terms set forth herein, the Firm Securities or Option Securities, as the
case may be, which the defaulting Underwriter or Underwriters failed to
purchase. If during such

<PAGE>

36 hours you, as such Representatives, shall not have procured such other
Underwriters, or any others, to purchase the Firm Securities or Option
Securities, as the case may be, agreed to be purchased by the defaulting
Underwriter or Underwriters, then (a) if the aggregate principal amount of
Securities with respect to which such default shall occur does not exceed 10% of
aggregate principal amount of the Firm Securities or Option Securities, as the
case may be, covered hereby, the other Underwriters shall be obligated,
severally, in proportion to the respective principal amounts of Firm Securities
or Option Securities, as the case may be, which they are obligated to purchase
hereunder, to purchase the Firm Securities or Option Securities, as the case may
be, which such defaulting Underwriter or Underwriters failed to purchase, or (b)
if the aggregate principal amount of Firm Securities or Option Securities, as
the case may be, with respect to which such default shall occur exceeds 10% of
the aggregate principal amount of Firm Securities or Option Securities, as the
case may be, covered hereby, the Company or you, as the Representatives of the
Underwriters, will have the right, by written notice given within the next
36-hour period to the parties to this Agreement, to terminate this Agreement
without liability on the part of the non-defaulting Underwriters or of the
Company except to the extent provided in Section 8 hereof. In the event of a
default by any Underwriter or Underwriters, as set forth in this Section 9, the
Closing Date or Option Closing Date, as the case may be, may be postponed for
such period, not exceeding seven days, as you, as Representatives, may determine
in order that the required changes in the Registration Statement or in the
Prospectus or in any other documents or arrangements may be effected. The term
"Underwriter" includes any person substituted for a defaulting Underwriter. Any
action taken under this Section 9 shall not relieve any defaulting Underwriter
from liability in respect of any default of such Underwriter under this
Agreement.

10.      NOTICES.

         All communications hereunder shall be in writing and, except as
otherwise provided herein, will be mailed, delivered, telecopied or telegraphed
and confirmed as follows: if to the Underwriters, to Deutsche Bank Securities
Inc., One South Street, Baltimore, Maryland 21202, Attention: Jay S. Eastman;
with a copy to Deutsche Bank Securities Inc., One Bankers Trust Plaza, 130
Liberty Street, New York, New York 10006, Attention: General Counsel; if to the
Company, to Natural MicroSystems Corporation, 100 Crossing Boulevard,
Framingham, Massachusetts 01702, Attention: President, with a copy to Choate,
Hall & Stewart, Exchange Place, 53 State Street, Boston, Massachusetts 02109,
Attention: Richard N. Hoehn, Esq.

11.      TERMINATION.

         (a)      This Agreement may be terminated by you by notice to the
                  Company at any time prior to the Closing Date if any of the
                  following has occurred: (i) since the respective dates as of
                  which information is given in the Registration Statement and
                  the Prospectus, any material adverse change or any development
                  involving a prospective material adverse change in or
                  affecting the condition, financial or

<PAGE>

                  otherwise, of the Company and its Subsidiaries taken as a
                  whole or the earnings, business, management, properties,
                  assets, rights, operations, condition (financial or otherwise)
                  or prospects of the Company and its Subsidiaries taken as a
                  whole, whether or not arising in the ordinary course of
                  business, (ii) any outbreak or escalation of hostilities or
                  declaration of war or national emergency or other national or
                  international calamity or crisis or change in economic or
                  political conditions if the effect of such outbreak,
                  escalation, declaration, emergency, calamity, crisis or change
                  on the financial markets of the United States would, in your
                  reasonable judgment, make it impracticable or inadvisable to
                  market the Securities or to enforce contracts for the sale of
                  the Securities, or (iii) suspension of trading in securities
                  generally on the New York Stock Exchange, the American Stock
                  Exchange or the Nasdaq National Market or limitation on prices
                  (other than limitations on hours or numbers of days of
                  trading) for securities on either such Exchange or the Nasdaq
                  National Market, (iv) the enactment, publication, decree or
                  other promulgation of any statute, regulation, rule or order
                  of any court or other governmental authority which in your
                  opinion materially and adversely affects or may materially and
                  adversely affect the business or operations of the Company,
                  (v) declaration of a banking moratorium by United States or
                  New York State authorities, (vi) any downgrading, or placement
                  on any watch list for possible downgrading, in the rating of
                  the Company's debt securities by any "nationally recognized
                  statistical rating organization" (as defined for purposes of
                  Rule 436(g) under the Exchange Act); (vii) the suspension of
                  trading of the Company's common stock by the Nasdaq National
                  Market, the Commission, or any other governmental authority
                  or, (viii) the taking of any action by any governmental body
                  or agency in respect of its monetary or fiscal affairs which
                  in your reasonable opinion has a material adverse effect on
                  the securities markets in the United States; or

         (b)      This Agreement may be terminated as provided in Sections 6 and
                  9 of this Agreement.

12.      SUCCESSORS.

         This Agreement has been and is made solely for the benefit of the
Underwriters and the Company and their respective successors, executors,
administrators, heirs and assigns, and the officers, directors and controlling
persons referred to herein, and no other person will have any right or
obligation hereunder. No purchaser of any of the Securities from any Underwriter
shall be deemed a successor or assign merely because of such purchase.

13.      INFORMATION PROVIDED BY UNDERWRITERS.

         The Company and the Underwriters acknowledge and agree that the only
information furnished or to be furnished by any Underwriter to the Company for
inclusion in any

<PAGE>

Prospectus or the Registration Statement consists of the information set forth
in the last paragraph on the front cover page (relating to the Underwriters'
expected delivery of the Securities) and the information set forth in the table
after the first paragraph and fifth, sixth, and seventh paragraphs under the
caption "Underwriting" in the Prospectus.

14.      MISCELLANEOUS.

         The reimbursement, indemnification and contribution agreements
contained in this Agreement and the representations, warranties and covenants in
this Agreement shall remain in full force and effect regardless of (a) any
termination of this Agreement, (b) any investigation made by or on behalf of any
Underwriter or controlling person thereof, or by or on behalf of the Company or
its directors or officers, and (c) delivery of and payment for the Securities
under this Agreement.

         This Agreement may be executed in two or more counterparts, each of
which shall be deemed an original, but all of which together shall constitute
one and the same instrument.

         This Agreement shall be governed by, and construed in accordance with,
the laws of the State of Maryland.

<PAGE>

         If the foregoing letter is in accordance with your understanding of our
agreement, please sign and return to us the enclosed duplicates hereof,
whereupon it will become a binding agreement among the Company and the several
Underwriters in accordance with its terms.

                                     Very truly yours,

                                     NATURAL MICROSYSTEMS CORPORATION


                                     By:    /s/ Robert Schechter
                                            --------------------------------
                                     Name:  Robert P. Schechter
                                     Title: President and CEO




The foregoing Underwriting Agreement
is hereby confirmed and accepted as
of the date first above written.

DEUTSCHE BANK SECURITIES INC.
U.S. BANCORP PIPER JAFFRAY INC.
DAIN RAUSCHER INCORPORATED

As Representatives of the several
Underwriters listed on Schedule I

By:  DEUTSCHE BANK SECURITIES INC.



By: /s/ Michael Halloran
    -------------------------------------
     Authorized Officer

<PAGE>

                                   SCHEDULE I

                            SCHEDULE OF UNDERWRITERS


                                               PRINCIPAL AMOUNT OF FIRM
         UNDERWRITER                           SECURITIES TO BE PURCHASED

Deutsche Bank Securities Inc.                       $113,750,000
U.S. Bancorp Piper Jaffray Inc.                       39,375,000
Dain Rauscher Incorporated                            21,875,000

                                                    ------------
         TOTAL                                      $175,000,000

<PAGE>

                                    EXHIBIT A

                                  SUBSIDIARIES


Natural MicroSystems Asia Ltd.
Natural MicroSystems Japan K.K.
Natural MicroSystems Singapore Pte Ltd.
Natural MicroSystems Telecom Europe S.A.
Natural MicroSystems Europe S.A.
Natural MicroSystems Europe GmbH
Natural MicroSystems Limited
Natural MicroSystems Italia
Natural MicroSystems Latin America S.A.
Natural MicroSystems Australia Pty Ltd.
Natural MicroSystems International, Inc.
Natural MicroSystems Europe, Inc.
Natural MicroSystems FSC Ltd.
Natural MicroSystems Securities Corporation
Natural MicroSystems Korea, Inc.
Natural MicroSystems Brasil Ltda.
Natural MicroSystems NV
Via DSP, Inc.
QWES.com, Inc.
InnoMediaLogic (IML) Inc.
3044009 Nova Scotia ULC
3044010 Nova Scotia Inc.
3758982 Canada Inc.
NMS Sweden AB

<PAGE>

                                    EXHIBIT B

                            SIGNIFICANT SUBSIDIARIES

NMS International, Inc. (Delaware)
NMS Europe, Inc. (Delaware)
Natural MicroSystems Telecom Europe S.A. (France)
Natural MicroSystems Europe S.A. (France)
Natural MicroSystems Securities Corporation (Massachusetts)
Natural MicroSystems Asia Ltd. (Hong Kong)
QWES.com, Inc. (California)
InnoMediaLogic (IML) Inc.

<PAGE>

                                    EXHIBIT C

                          LOCKUP AGREEMENT SIGNATORIES

Robert P. Schechter
Zenas W. Hutcheson, III
W. Frank King, Ph.D.
Pamela D. A. Reeve
Ronald W. White
Robert E. Hult
George D. Kontopidis, Ph.D.
Dorothy A. Terrell
R. Brough Turner
Allen P. Carney
Ofer Gneezy
William E. Foster
Charles J. Walker

<PAGE>

                                    EXHIBIT D

                            FORM OF LOCKUP AGREEMENT

                        NATURAL MICROSYSTEMS CORPORATION
                             100 CROSSING BOULEVARD
                      FRAMINGHAM, MASSACHUSETTS 01702-5406


                                         ___________, 2000


Deutsche Bank Securities Inc.
1 South Street
Baltimore, Maryland 21202

Ladies and Gentlemen:

         The undersigned understands that Deutsche Bank Securities Inc., also
known as Deutsche Banc Alex. Brown ("Alex. Brown"), together with U.S. Bancorp
Piper Jaffray Inc. and Dain Rauscher Incorporated as representatives (the
"Representatives") of the several underwriters (the "Equity Underwriters")
propose to enter into an Equity Underwriting Agreement with Natural MicroSystems
Corporation (the "Company"), providing for a public offering by the Equity
Underwriters, including the Representatives, of common stock, par value $.01 per
share (the "Common Stock"), of the Company (the "Equity Public Offering"), and
Alex. Brown, together with the Representatives of the several underwriters (the
"Debt Underwriters," and together with the Equity Underwriters, the
"Underwriters"), propose to enter into a Convertible Debt Underwriting Agreement
with the Company, providing for a public offering by the Debt Underwriters,
including the Representatives, of convertible subordinated notes of the Company
(the "Debt Public Offering," and together with the Equity Public Offering, the
"Public Offerings"), pursuant to prospectus supplements (the "Prospectus
Supplements") to the Registration Statement on Form S-3 filed August 18, 2000
with the Securities and Exchange Commission (the "SEC").

         In consideration of the agreements by the Underwriters to make the
Public Offerings and for other good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the undersigned agrees that,
without the prior written consent of Alex. Brown, the undersigned will not
directly or indirectly offer, sell, pledge, contract to sell (including any

<PAGE>

short sale), enter into any Hedging Transaction (as defined below) relating to,
grant any option to purchase or otherwise dispose of (each of the foregoing
referred to as a "Disposition") (i) any Locked-up Shares (as defined below)
during the period commencing with the date of this letter agreement and ending
on the 29th day after the date of the final Prospectus Supplements (the
"Supplement Date"), (ii) more than 1/3 of the Locked-up Shares during the period
commencing on the 30th day after the Supplement Date and ending on the 59th day
after the Supplement Date, and (iii) more than 2/3 of the Locked-up Shares
(including the shares disposed of pursuant to clauses (ii) above) during the
period commencing on the 60th day after the Supplement Date and ending on the
89th day after the Supplement Date. For purposes of this letter agreement,
"Locked-up Shares" shall mean any shares of Common Stock, including, without
limitation, Common Stock that may be issued upon exercise of a stock option or
warrant, in each case beneficially owned by the undersigned on the date hereof
in accordance with the rules and regulations of the SEC. The foregoing
restriction is expressly intended to preclude the undersigned from engaging in
any Hedging Transaction or other transaction which is designed to or reasonably
expected to lead to or result in a Disposition which would exceed the permitted
Disposition levels contained in clauses (i) through (iii) above, even if the
securities would be disposed of by someone other than the undersigned. "Hedging
Transaction" means any short sale (whether or not against the box) or any
purchase, sale or grant of any right (including, without limitation, any put or
call option) with respect to any security (other than a broad-based market
basket or index) that includes, relates to or derives any significant part of
its value from the Common Stock.

         Notwithstanding the foregoing, the undersigned may transfer any or all
of the Locked-up Shares by gift, will or intestacy; provided, however, that in
any such case it shall be a condition to the transfer that the transferee
execute an agreement stating that the transferee is receiving and holding the
Locked-up Shares subject to the provisions of this letter agreement, and there
shall be no further transfer of such Locked-up Shares except in accordance with
this letter agreement.


         Without limiting the restrictions herein, any Disposition by the
undersigned shall remain at all times subject to applicable securities laws,
including without limitation the resale restrictions imposed by Rule 144
promulgated under the Securities Act of 1933.

         The undersigned agrees that the Company may, and that the undersigned
will, (i) with respect to any shares for which the undersigned is the record
holder, cause the transfer agent for the Company to note stop transfer
instructions with respect to such shares on the transfer books and records of
the Company and (ii) with respect to any shares for which the undersigned is the
beneficial holder but not the record holder, cause the record holder of such
shares to cause the transfer agent for the Company to note stop transfer
instructions with respect to such shares on the transfer books and records of
the Company.

         The undersigned hereby agrees that, to the extent that the terms of
this letter agreement

<PAGE>

conflict with or are in any way inconsistent with any agreement providing
registration rights to which the undersigned and the Company may be a party,
this letter agreement supersedes such registration rights agreement.

         The undersigned understands that the Company, the Underwriters and the
Representatives will proceed with the Public Offerings in reliance on this
letter agreement.

         The undersigned hereby represents and warrants that the undersigned has
full power and authority to enter into this letter agreement. All authority
herein conferred or agreed to be conferred shall survive the death or incapacity
of the undersigned and any obligations of the undersigned shall be binding upon
 the heirs, personal representatives, successors and assigns of the undersigned.


                                      Very truly yours,


                                      ---------------------------------
                                      Name:


                                      ---------------------------------
                                      (Social Security or Taxpayer
                                       Identification No.)


                                      ----------------------------------

                                      ----------------------------------

                                      ----------------------------------
                                      Address


Number of shares owned or             Certificate numbers:
subject to warrants, options
or convertible securities:





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