SI DIAMOND TECHNOLOGY INC
8-K, 1996-11-01
GENERAL INDUSTRIAL MACHINERY & EQUIPMENT
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549



                                   FORM 8-K

                                CURRENT REPORT

     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) October 30, 1996
                                                 ------------------

                         SI DIAMOND TECHNOLOGY, INC.
              (Exact name of Registrant as specified in charter)

       TEXAS                    1-11602                   76-0273345
     (State of                (Commission                (IRS Employer
    Incorporation)            File Number)           Identification Number)


            12100 Technology Boulevard                     
                  Austin, Texas                             78727
      (Address of principal executive office)             (Zip Code)


Registrant's telephone number, including area code: (512) 331-6200



        (Former name or former address, if changed since last report):

                                Not Applicable
                                ==============
<PAGE>
 
ITEM 5. OTHER EVENTS

     On October 31, 1996, Diamond Tech One, Inc. ("DTO"), a wholly-owned
subsidiary of SI Diamond Technology, Inc. (the "Company") completed transactions
in which it raised a total of $1,000,000 in debt from four separate sources,
each of which loaned $250,000 to DTO. DTO issued identical promissory notes to
each of these sources in which it agreed to pay interest at a rate fifteen
percent (15%) per annum, which interest is payable on February 1, 1997 and June
1, 1997. These promissory notes mature on June 1, 1997 and are guaranteed by the
Company. In addition, the Company issued warrants to each of these sources to
purchase 50,000 shares of the Company's Common Stock at $1.00 per share. These
warrants expire on June 1, 1998. 

     On October 30, 1996, DTO entered into an agreement and promissory note
with Austin National Bank for a $500,000 revolving line of credit. Any funds
borrowed pursuant to this agreement shall be payable on demand, or if no demand
is made, in one payment of all outstanding principal plus all accrued and unpaid
interest on July 30, 1997. In addition, DTO will pay regular quarterly payments
of accrued unpaid interest beginning January 30, 1997, and all subsequent
interest payments are due on the same day of each quarter after that. The
Company also executed a commercial guaranty in which it agreed to guarantee the
loan of any funds to DTO pursuant this agreement and promissory note.

     Since the above described transactions were completed by October 31, 1996,
the remaining holders of the Company's Series E Preferred Stock have agreed (i)
not to convert any remaining Series E Preferred Stock into Common Stock of the
Company until January 15, 1997 and (ii) to only convert Series E Preferred Stock
during the period from and including January 15, 1997 to February 28, 1997 in an
amount equal to one-third of the shares held by each holder of Series E
Preferred Stock on September 16, 1996, less certain amounts already converted.

ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS

      4.1 Form of Warrant to purchase Common Stock of the Company issued in
connection with the loan of $1,000,000 to Diamond Tech One, Inc. (October,
1996).

     10.1 Form of Promissory Note payable by Diamond Tech One, Inc. for $250,000
in connection with the loan of $1,000,000 to Diamond Tech One, Inc. (October, 
1996).

     10.2 Form of Guaranty by the Company in connection with the loan of 
$1,000,000 to Diamond Tech One, Inc. (October, 1996).

     10.3 Form of Loan and Security Agreement in connection with loan of 
$1,000,000 to Diamond Tech One, Inc. (October, 1996).

     10.4 Form of Agreement by and among the Company concerning Agreements 
relating to Series E Preferred Stock (Exhibit 10.1 to the Company's Current 
Report on Form 8-K dated September 25, 1996 (File No. 1-11602).

     10.5 Promissory Note dated as of October 30, 1996 made payable to Austin
National Bank by Diamond Tech One, Inc.

     10.6 Commercial Guaranty by SI Diamond Technology, Inc. of Promissory Note
made payable to Austin National Bank by Diamond Tech One and dated as of October
30, 1996.

     10.7 Commercial Security Agreement dated as of October 30, 1996 by and
between Austin National Bank and Diamond Tech One.
 
<PAGE>
 
                                  SIGNATURES

     Pursuant to the Securities Act of 1934, the Registrant has duly caused this
report to be signed on its behalf by the undersigned, thereto duly authorized.

                                       SI DIAMOND TECHNOLOGY, INC.

                                       By: /s/ DOUGLAS P. BAKER
                                           ----------------------------------
                                           Douglas P. Baker
                                           Vice President and
                                           Chief Financial Officer 


<PAGE>
 
                                                                     EXHIBIT 4.1

THIS CERTIFICATE AND THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED
UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR ANY
STATE SECURITIES LAW, AND MAY NOT BE SOLD, TRANSFERRED, PLEDGED, HYPOTHECATED OR
OTHERWISE DISPOSED OF UNLESS (i) A REGISTRATION STATEMENT UNDER THE SECURITIES
ACT AND APPLICABLE STATE SECURITIES LAWS SHALL HAVE BECOME EFFECTIVE WITH REGARD
THERETO, OR (ii) AN EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OR
APPLICABLE STATE SECURITIES LAWS IS AVAILABLE IN CONNECTION WITH SUCH OFFER,
SALE OR TRANSFER.

Warrant to Purchase
50,000 Shares


                       WARRANT TO PURCHASE COMMON STOCK
                                      OF
                          SI DIAMOND TECHNOLOGY, INC.

     THIS CERTIFIES that               ("Holder") or any subsequent holder
hereof, has the right to purchase from SI Diamond Technology, Inc., a Texas 
Corporation (the "Company"), not more than 50,000 fully paid and nonassessable 
shares of the Company's Common Stock, $.001 par value ("Common Stock"), at a 
price of $      per share (the "Exercise Price"), subject to adjustment as
provided below at any time on or before 5:00 p.m., Austin, Texas time, on June 
1, 1998 ("Expiration Date").

     The Holder of this Warrant agrees with the Company that this Warrant is 
issued and all rights hereunder shall be held subject to all of the conditions, 
limitations and provisions set forth herein.

     1. Exercise.

     This Warrant may be exercised as to all or any lesser number of full shares
of Common Stock covered hereby upon surrender of this Warrant, with the
Subscription Form attached hereto duly executed, together with the full Exercise
Price (as hereinafter defined) for each share of Common Stock as to which this
Warrant is exercised, at the office of the Company, Attn: President, SI Diamond
Technology, Inc., 12100 Technology Boulevard, Austin, Texas 78727 or at such
other office or agency as the Company may designate in writing, by overnight
mail, with an advance copy of the Subscription Form attached as Exhibit A
("Subscription Form") by facsimile (such surrender and payment hereinafter
called the "Exercise of this Warrant"). The "Date of Exercise" of the Warrant
shall be defined as the date that the advance copy of the Subscription Form is
sent by facsimile to the Company, provided that the original Warrant and
Subscription Form are received by the Company within five business days
thereafter. The original Warrant and Subscription Form must be received within
five business days of the Date of Exercise, or the Subscription Form may, at the
Company's option, be considered void. This Warrant shall be canceled upon its
Exercise, and, as soon as practical after the

<PAGE>
 
Date of Exercise, the Holder hereof shall be entitled to receive a certificate 
or certificates for the number of shares of Common Stock purchased upon such 
Exercise and a new Warrant or Warrants (containing terms identical to this 
Warrant) representing any unexercised portion of this Warrant. Each person in 
whose name any certificate for shares of Common Stock is issued shall, for all 
purposes, be deemed to have become the Holder of record of such shares on the 
Date of Exercise of this Warrant, irrespective of the date of delivery of such 
shares on the Date of Exercise of this warrant, irrespective of the date of 
delivery of such certificate. Nothing in this Warrant shall be construed as 
conferring upon the Holder hereof any rights as a shareholder of the Company.

     2. Payment of Warrant Exercise Price.

     Payment of the Exercise Price shall be made by cash, certified check or 
cashiers check or wire transfer.

     3. Transfer and Registration.

     (a) Subject to the provisions of Section 7 of this Warrant, this Warrant 
may only be transferred on the books of the Company, wholly or in part, in 
person or by attorney, upon surrender of this Warrant properly endorsed, with 
signature guaranteed. This Warrant shall be canceled upon such surrender and, as
soon as practicable thereafter, the person to whom such transfer is made shall 
be entitled to receive a new Warrant or Warrants as to the portion of this 
Warrant transferred, and the Holder of this Warrant shall be entitled to receive
a new Warrant or Warrants as to the portion hereof retained.

     (b) Within 15 days of the date of issuance of this Warrant, the Company 
shall file a post-effective amendment to the Registration Statement previously 
filed by the Company with the Securities and Exchange Commission on Form S-3 
under the Securities Act of 1933, as amended (the "Act"), file No. 333-00674 
(the "Registration Statement") to include the Common Stock in the Registration 
Statement. Until the Expiration Date, or such earlier time as this Warrant has 
been exercised in its entirety, the Company shall prepare and cause to be filed 
and cause to become and remain effective such amendments or supplements to the 
Registration Statement and the Prospectus contained therein, as shall be 
required under the Act in order to keep Common Stock registered under the Act, 
in order to deliver to the Holder, upon exercise of the Warrant, a Prospectus 
meeting the requirements of Section 10(a)(3) of the Act.

     The Company shall obtain and keep effective all permits, consents and 
approvals of governmental agencies and authorities, and shall take all actions 
which may be necessary to maintain the registration of the Common Stock under 
the Securities and Exchange Act of 1934 and to qualify the Common Stock for sale

                                       2
<PAGE>
 
under the securities laws of such states, territories and possessions of the 
United States under which the Common Stock is presently qualified and shall 
maintain such qualifications until the Expiration Date.

     4. Anti-Dilution Adjustments.

     (a) If the Company shall at any time declare a dividend payable in shares 
of Common Stock, then the Holder hereof, upon Exercise of this Warrant after the
record date for the determination of holders of Common Stock entitled to receive
such dividend, shall be entitled to receive upon Exercise of this Warrant, in 
addition to the number of shares of Common Stock as to which this Warrant is 
Exercised, such additional shares of Common Stock as such Holder would have 
received had this Warrant been Exercised immediately prior to such record date.

     (b) If the Company shall at any time effect a recapitalization or 
reclassification of such charter that the share of Common Stock shall be changed
into or become exchangeable for a larger or smaller number of shares, then upon 
the effective date thereof, the number of shares of Common Stock which the 
Holder hereof shall be entitled to purchase upon Exercise of this Warrant shall 
be increased or decreased, as the case may be, in direct proportion to the 
increase or decrease in the number of shares of Common Stock by reason of such 
recapitalization or reclassification, and the Exercise Price shall be, in the 
case of an increase in the number of shares, proportionately decreased and, in 
the case of a decrease in the number of shares, proportionally increased.

     (c) If the Company shall at any time distribute to holders of Common Stock 
cash, evidences of indebtedness or other securities or assets (other than cash 
dividends or distributions payable out of earned surplus or net profits for the 
current or preceding year) then, in any such case, the Holder of this Warrant 
shall be entitled to receive, upon exercise of this Warrant, with respect to 
each share of Common Stock issuable upon such Exercise, the amount of cash or 
evidences of indebtedness or other securities or assets which such Holder would
have been entitled to receive with respect to each such share of Common Stock as
a result of the happening of such event had this Warrant been Exercised 
immediately prior to the record date or other date fixing shareholders to be 
affected by such event (the "Determination Date") or, in lieu thereof, if the 
Board of Directors of the Company should so determine at the time of such 
distribution, a reduced Exercise Price determined by multiplying the Exercise 
Price on the Determination Date by a fraction, the numerator of which is the 
result of such Exercise Price reduced by the value of such distribution 
applicable to one share of Common Stock (such value to be determined by the 
Board in its discretion) and the denominator of which is such Exercise Price.

                                       3
<PAGE>
 
     (d) If the Company shall at any time consolidate or merge with any other 
corporation or transfer all or substantially all of its assets, then the Company
shall deliver written notice to the Holder of such merger, consolidation or sale
of assets at least thirty (30) days prior to the closing of such merger, 
consolidation or sale of assets and this Warrant shall terminate and expire 
immediately prior to the closing of such merger, consolidation or sale of 
assets.

     (e) As used in this Warrant, the term "Exercise Price" shall mean the 
purchase price per share specified in this Warrant until the occurrence of an 
event stated in subsection (b) or (c) of this Section 4 and thereafter shall 
mean said price as adjusted from time to time in accordance with the provisions 
of said subsection. No such adjustment shall be made unless such adjustment 
would change the Exercise Price at the time by $.01 or more; provided, however, 
that all adjustments not so made shall be deferred and made when the aggregate 
thereof would change the Exercise Price at the time by $.01 or more. No 
adjustment made pursuant to any provision of this Section 4 shall have the 
effect of increasing the total consideration payable upon Exercise of this 
Warrant in respect of all the Common Stock as to which this Warrant may be 
exercised.

     (f) In the event that at any time, as a result of an adjustment made 
pursuant to this Section 4, the Holder of this Warrant shall, upon Exercise of 
this Warrant, become entitled to receive shares and/or other securities or 
assets (other than Common Stock) then, wherever appropriate, all references 
herein to shares of Common Stock shall be deemed to refer to and include such 
shares and/or other securities or assets; and thereafter the number of such 
shares and/or other securities or assets shall be subject to adjustment from 
time to time in a manner and upon terms as nearly equivalent as practicable to 
the provisions of this Section 4.

     5. Fractional Interests.

     No fractional shares or scrip representing fractional shares shall be 
issuable upon the Exercise of this Warrant, but on Exercise of this Warrant, the
Holder hereof may purchase only a whole number of shares of Common Stock. The 
Company shall make a payment in cash in respect of any fractional shares which 
might otherwise be issuable upon Exercise of this Warrant, calculated by 
multiplying the fractional share amount by the market price of the Company's 
Common Stock on the Date of Exercise as quoted on the Nasdaq Small-Cap Market or
such other exchange as Company's Common Stock is traded or quoted on.

     6. Reservation of Shares.

     The Company shall at all times reserve for issuance such number of 
authorized and unissued shares of Common Stock (or other 

                                       4

<PAGE>
 
securities substituted therefor as herein above provided) as shall be sufficient
for Exercises of this Warrant. The Company covenants and agrees that upon 
Exercise of this Warrant, all shares of Common Stock issuable upon such Exercise
shall be duly and validly issued, fully paid, non assessable and not subject to 
preemptive rights, rights of first refusal or similar rights of any person or 
entity.

     7. Restrictions on Transfer.

     (a) This Warrant has not been registered under the Act and may not be sold,
transferred, pledged, hypothecated or otherwise disposed of in the absence of 
registration or the availability of an exemption from registration under the 
Act.

     (b) Assuming the conditions of (a) above regarding registration or 
exemption have been satisfied, the Holder may sell, transfer, assign, pledge or 
otherwise dispose of this Warrant, in whole or in part. Holder shall deliver a
written notice to Company, substantially in the form of the Assignment attached
hereto as Exhibit B, indicating the person or persons to whom the Warrant shall 
be assigned and the respective number of warrants to be assigned to each 
assignee. The Company shall effect the assignment within ten days, and shall 
deliver to the assignee(s) designated by the Holder, a Warrant or Warrants of 
like tenor and terms for the appropriate number of shares.

     (c) Until registration under the Act of the Common Stock, pursuant to 
Section 3(b), the provisions of Sections (a) and (b) above shall apply to the 
Common Stock as well as the Warrant.

     8. Benefits of this Warrant.
  
     Nothing in this Warrant shall be construed to confer upon any person other 
than the Company and the Holder of this Warrant any legal or equitable right, 
remedy or claim under this Warrant and this Warrant shall be for the sole and 
exclusive benefit of the Company and the Holder of this Warrant.

     9. Applicable Law.

     This Warrant is issued under and shall for all purposes be governed by and 
construed in accordance with the laws of the state of Texas. Jurisdiction for 
any dispute regarding this Warrant lies in Texas.

     10. Loss of Warrant.

     Upon receipt by the Company of evidence of the loss, theft, destruction or 
mutilation of this Warrant, and (in the case of loss, theft or destruction) of 
indemnity or security reasonably satisfactory to the Company, and upon surrender
and cancellation of 

                                       5
<PAGE>
 
this Warrant, if mutilated, the Company shall execute and deliver a new Warrant 
of like tenor and date.

     11. Notice to Company.

     Notices or demands pursuant to this Warrant to be given or made by the 
Holder of this Warrant to or on the Company shall be sufficiently given or made 
if sent by certified or registered mail, return receipt requested, postage 
prepaid, and addressed, until another address is designated in writing by the 
Company, Attn: President, SI Diamond Technology, Inc., 2435 North Boulevard, 
Houston, Texas 77098. Notices or demands pursuant to this Warrant to be given or
made by the Company to or on the Holder of this Warrant shall be sufficiently 
given or made if sent by certified or registered mail, return receipt requested,
postage prepaid, and addressed to:
                                   ---------------------------------------------
- --------------------------------------------------------------------------------
until another address is designated in writing by the Holder.

     IN WITNESS WHEREOF, this Warrant is hereby executed as of the date set 
forth below.


Dated as of October    , 1996.



                                       SI DIAMOND TECHNOLOGY, INC.



                                       By:
                                          --------------------------------------
                                                        President


                                       6
<PAGE>
 
                                   EXHIBIT A

                               SUBSCRIPTION FORM

                       TO:  SI DIAMOND TECHNOLOGY, INC.

        The undersigned hereby irrevocably exercises the right to purchase 
______________ of the shares of Common Stock of SI Diamond Technology, Inc., a 
Texas corporation, evidenced by the attached Warrant, and herewith makes payment
of the Exercise Price with respect to such shares in full, all in accordance 
with the conditions and provisions of said Warrant.

        The undersigned agrees not to offer, sell, transfer or otherwise dispose
of any of such Common Stock, except in accordance with the provisions of Section
7 of the Warrant, and consents that the following legend may be affixed to the 
certificates for the Common Stock hereby subscribed for, if such legend is 
applicable:

        "The securities represented by this certificate have not been registered
under the Securities Act of 1933, as amended (the "Securities Act"), or any 
state securities law, and may not be sold, transferred, pledged, hypothecated or
otherwise disposed of until either (i) a registration statement under the 
Securities Act and applicable state securities laws shall have become effective 
with regard thereto, or (ii) an exemption from registration under the Securities
Act or applicable state securities laws is available in connection with such 
offer, sale or transfer."

        The undersigned requests that certificates for such shares be issued, 
and a warrant representing any unexercised portion thereof

<PAGE>
 
be issued, pursuant to the Warrant in the name of the Registered Holder and 
delivered to the undersigned at the address set forth below:

Dated:

- -------------------------------------------------------------------------------
                        Signature of Registered Holder

- -------------------------------------------------------------------------------
                       Name of Registered Holder (Print)

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

- -------------------------------------------------------------------------------
The Attached Warrant has not been registered under the Securities Act of 1933, 
as amended, and may not be sold, transferred, pledged, hypothecated or otherwise
disposed of in the absence of registration or the availability of an exemption 
from registration under said Act.
- -------------------------------------------------------------------------------

<PAGE>
 
                                   EXHIBIT B

                                  ASSIGNMENT

                   (To be executed by the registered holder
                       desiring to transfer the Warrant)

FOR VALUE RECEIVED, the undersigned Holder of the attached Warrant hereby sells,
assigns and transfers unto the person or persons below named the right to 
purchase _____________________ shares of the Common Stock of SI DIAMOND 
TECHNOLOGY, INC. evidenced by the attached Warrant and does hereby irrevocably
constitute and appoint ___________________________ attorney to transfer the said
Warrant on the books of the Company, with full power of substitution in the 
premises.

Dated:                                          ___________________________
                                                         Signature

Fill in for new Registration of Warrant

- ---------------------------------------------
         Name

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

- ---------------------------------------------
Please print name and address of assignee 
(including zip code number)

- --------------------------------------------------------------------------------
NOTICE

The signature to the foregoing Subscription Form or Assignment must correspond
to the name as written upon the face of the attached Warrant in every
particular, without alteration or enlargement of any change whatsoever.
- --------------------------------------------------------------------------------



<PAGE>

                                                                    EXHIBIT 10.1
 
                                PROMISSORY NOTE

$250,000                                                        OCTOBER __, 1996
                                                                AUSTIN, TEXAS

        On or before June 1, 1997, the undersigned, Diamond Tech One, Inc. 
("Borrower"), promises to pay to the order of___________________________
_______________________________("Lender"), at __________________________
__________________________, or at such other place as the holder of this Note 
may from time to time designate in writing, the principal sum of Two Hundred
Fifty Thousand Dollars ($250,000), together with interest thereon from the date
hereof at the rate of 15% per annum. Interest is payable on February 1, 1997 and
on June 1, 1997.

        This Note may be prepaid in whole or in part without premium or penalty.
Payments and prepayments of this Note shall first be credited to interest and 
the remainder to principal.

        In the event any interest is not paid when due, or any default occurs 
under the Loan and Security Agreement entered into between Borrower and Lender 
on the date hereof (the "Loan Agreement"), Lender may, at its option, declare 
the entire indebtedness due and payable. The Loan Agreement is incorporated by 
reference into this Promissory Note.

        The Borrower agrees to pay or reimburse Lender for its reasonable costs 
incurred in connection with the collection of this Note, including, without 
limitation, the fees and disbursements of counsel for Lender, whether or not 
suit is brought.

        All persons now or at any time liable for payment of this Note hereby 
waive presentment, protest, notice of protest, and notice of dishonor.

        This Note shall be governed by the laws of Texas, without application of
conflicts of law principles.

                                                DIAMOND TECH ONE, INC.


                                                By:________________________
                                                   President
 


<PAGE>
 
                                                                    EXHIBIT 10.2
 
                              GUARANTY AGREEMENT


        This is a Guaranty Agreement (the "Guaranty"), dated as of the __ day of
October, 1996, made by SI Diamond Technology, Inc., a Texas corporation ("SIDT")
in favor of                       ("Lender").

                                   RECITALS

        SIDT is the owner of all of the outstanding capital stock of Diamond 
Tech One, Inc., a Delaware corporation ("DTO").  In order to induce Lender to 
make a loan in the amount of $250,000 to DTO (the "Loan"), SIDT is willing to 
guaranty the obligations of DTO to Lender and to grant Lender a warrant to 
purchase 50,000 shares of SIDT common stock (par value $ .001 per share) (the 
"Warrant").

        In consideration of the Lender making the Loan to DTO, SIDT agrees:

        1. SIDT irrevocably and unconditionally guarantees the full and 
prompt payment when due of the principal of and interest on the Loan and of all 
other obligations and liabilities under the Loan and Security Agreement to be 
entered into between DTO and Lender.

        2. Simultaneously with the funding of the Loan, SIDT shall issue and
deliver the Warrant to Lender.

        3. SIDT represents and warrants to the Lender that this Guaranty and the
Warrant have been duly authorized by the Board of Directors of SIDT as evidenced
by the Certificate of Corporate Resolutions attached hereto.

        Dated at Austin, Texas this ___ day of October, 1996.

                                                SI DIAMOND TECHNOLOGY, INC.


                                                By:________________________
                                                   President

                                                Attest:____________________
                                                       Secretary



<PAGE>
 
                                                                    EXHIBIT 10.3


                          LOAN AND SECURITY AGREEMENT

     This is a Loan and Security Agreement (the "Agreement") entered into as of 
the     day of October, 1996, by Diamond Tech One, Inc., a Delaware corporation 
("Borrower") and                                    ("Lender").


                                   RECITALS

     Borrower as requested a loan (the "Loan") from Lender in the principal 
amount of Two Hundred Fifty Thousand Dollars ($250,000). The Lender has agreed 
to extend such financing to Borrower upon the terms, and subject to the 
conditions, of this Agreement.

     In consideration of the mutual promises contained herein, the Borrower and 
the Lender agree:

     1. Agreement to Lend.  Upon the terms and subject to the conditions of this
Agreement, the Lender shall make the Loan and shall disburse the Loan proceeds 
in the full amount thereof to Borrower pursuant to wire transfer instructions 
from Borrower.

     2. Promissory Note.  The Loan shall be evidenced by a promissory note (the 
"Note") of even date herewith, in the principal amount of $250,000 bearing 
interest at 15% per annum, maturing June 1, 1997 (the "Maturity Date"). Interest
shall be payable on February 1, 1997 and June 1, 1997.

     3. Security.  The Loan, in common with any Companion Loans (as hereinafter 
defined), shall be secured by a security interest hereby granted to Lender on
the property described on Schedule A hereto (the "Collateral"). If the
Collateral is not encumbered by a security interest granted to a bank or other
financial institution (a "Bank") when this Agreement is executed, the Lender
shall thereafter subordinate the lien of its security interest to security
interests granted to Banks, securing an aggregate principal amount not exceeding
$1,000,000.

     4. Guaranty and Warrant.  The Loan shall be unconditionally guaranteed by 
SI Diamond Technology, Inc. ("SIDT"), a Texas corporation, the parent company of
Borrower (the "Guaranty"). In addition to the Guaranty, SIDT shall grant Lender 
a presently exercisable warrant to purchase 50,000 shares of the common stock 
(per value $.001 per share) of SIDT (the "Warrant") dated the date of this 
Agreement, upon the terms and conditions therein set forth.

     5. Representation and Warranties.  Borrower represents and warrants:
<PAGE>
 
         (a) Borrower is a corporation duly organized, validly existing and in 
    good standing under the laws of the State of Delaware, is duly authorized to
    do business in the State of Texas and has full power and authority to
    conduct its business as presently conducted;

         (b) Borrower has full power and authority to perform its obligations 
    under the Note and this Agreement;

         (c) other than a security interest which may be held by a Bank, 
    Borrower owns the Collateral free and clear of any liens or encumbrances;
    and

         (d) this Agreement is being executed on behalf of Borrower by its duly 
    authorized officers and such execution has been approved by all necessary
    and proper corporate action.

     6. Further Assurances.  Whenever required to give effect to the terms of 
this Agreement, both parties shall timely execute such financing statements, 
subordination agreements or other agreements and documents as may be required. 
Borrower will, at any time on Lender's request, make, do, execute and deliver to
Lender or any Bank, and, where appropriate, shall cause to be recorded or filed,
any and all further acts, documents and assurances as may be reasonably
necessary or desirable to effectuate, complete and confirm the transaction
sought to be consummated hereunder.

     7. Related Loans.  The Loan is identical to other loans, each dated as of
the date hereof for the same amount and upon identical terms and conditions as 
the Loan (the "Companion Loans"). The Companion Loans are evidenced by notes 
identical to the Note (the "Companion Notes"). The Loan and the Companion Loans 
collectively, are sometimes called the "Total Loan". The Total Loan principal 
amount shall not, in the aggregate, exceed One Million Dollars ($1,000,000). If 
there are less than three Companion Loans to be made to Borrower as of the date 
hereof in addition to this Loan, the Borrower shall have the right to refuse to 
accept this Loan.

     8. Borrower's Total Loan Covenant.  The Loan and each loan constituting the
Total Loan shall at all times receive equal payments and benefits from the 
Borrower.

     9. Events of Default.  The happening of any one or more of the following 
events shall constitute an Event of Default under this Agreement and the Note:

         a. Failure of Borrower to make any required payment of interest or 
    other charges or fees under the Loan or any Companion Loan;

         b. Failure of Borrower to pay all accrued interest and outstanding 
    principal on the Maturity Date (whether by acceleration or otherwise) or of
    any note representing a Companion Loan;



<PAGE>
 
                c. Breach of any of the terms and conditions of the Agreement or
any Companion Loan agreement;

                d. Failure of SIDT to comply with any of the terms and
conditions of the Guaranty and/or the Warrant.

        10. Remedies. Upon the occurrence of any Event of Default, the Lender
may declare the Loan in default and shall have the right at its option to:

                a.    Accelerate the maturity of the Note and demand payment of 
the principal sums due thereunder, with interest, reasonable costs and legal 
fees (whether or not suit is brought, incurred in connection with collection, 
trail or appeal) and enforce collection of such payment in any court of 
competent jurisdiction; or

                b.    Exercise any other right, privilege or remedy available to
Lender as may be provided by applicable law.

        11.     Lender's Covenants.  If any lender of a Companion Loan declares 
a Companion Loan to be in Default, the Lender hereunder and all Companion Loan 
lenders shall join in the action taken to obtain the remedy elected by the 
lender initiating such action.  Each lender shall pay a prorata portion of the 
expenses of enforcing the Total Loan obligation.  Once any action for collection
against the Borrower, the Guarantor or the Collateral has been commenced, the 
lenders of the Total Loan shall take action as determined by majority vote of 
all lenders of the Total Loan.

        12.     Exclusivity of Agreement.  This Agreement and the Note are made 
for the sole benefit and protection of Borrower, Lender, the Companion Loan 
lenders and their assigns and no other person shall have any right of action 
hereunder.

        13.     Notices to All Lenders.  When the Loan and the Companion Loans 
are disbursed, Borrower shall promptly give notice to each lender of the name, 
address, telephone and fax numbers of each other lender.  Borrower shall 
promptly notify all lenders of the occurrence of any Event of Default.

        14.     Notices.  All notices or other communications between Borrower 
and Lender shall also be given to each Companion Loan lender and may be given by
hand (or courier) delivery, or by certified or registered return receipt 
requested mail, addressed to the appropriate party (including Companion Loan 
lenders) at the address designated by such party who is to receive such notice.
Notices shall be deemed complete upon actual delivery.

        15.     Governing Law.  This Agreement and the Note shall be governed by
the laws of the State of Texas, without application of conflicts of law 
principles.

        
<PAGE>
 
        16. No Oral Modification. No provision of this Agreement, or any
Companion Loan agreement, shall be amended, waived or modified except by an
instrument in writing signed by the parties hereto and agreed to by the
Companion Loan lenders. Waiver by Lender of any breach or default by Borrower
under any of the terms of the Note or this Agreement shall not be deemed to be,
not shall the same constitute a waiver of any subsequent breach or default.

        17. Severability. Inapplicability or unenforceability of any provision
of this Agreement shall not limit or impair the operation or validity of any
other provision of this Agreement.

        18. Funding Conditions. Lender shall not be obligated to disburse the
Loan funds unless Lender shall have received the following:

                a.   Certificate of Borrower's corporate resolutions authorizing
the consummation of the transactions contemplated herein.

                b.   This Agreement and the Note duly executed by Borrower.

                c.   A UCC-1 Financing Statement executed by Borrower.

                d. Any other documents or instruments reasonably required by
Lender to evidence the transactions contemplated hereby.

        19. Payment of Brokers. The Lender shall not be obligated to pay any
fees, charges, costs or commissions in connection with the Loan, and the
Borrower agrees to indemnify the Lender against and to hold the Lender harmless
from any and all such fees, charges, costs, expenses or commissions.

        20. Headings. The descriptive section headings herein have been inserted
for convenience of reference only and shall not be deemed to limit or otherwise
affect the construction or interpretation of any provision of this Agreement.

        21. Counterparts. This Agreement may be executed in several
counterparts, each of which shall be deemed an original but all of which
together shall constitute one Agreement.

        Executed as of the date and year first above written.
 
































 
<PAGE>
 
                                     DIAMOND TECH ONE, INC.
                                     12100 Technology Boulevard
                                     Austin, Texas 78727


                                     By:
                                        -------------------------------
                                        ZVI YANIV

                                     Attest:
                                            ---------------------------
                                            Secretary

                                              (SEAL)

                                     LENDER

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

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

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

                                     
                                     Name:
                                          -----------------------------
                                     Title:
                                           ----------------------------
                                     Address:
                                             --------------------------



<PAGE>
                                                                                
                                                                    EXHIBIT 10.5

 AUSTIN
NATIONAL
  BANK

                                PROMISSORY NOTE

<TABLE> 
<S>             <C>         <C>           <C>        <C>   <C>          <C>        <C>       <C> 
- -----------------------------------------------------------------------------------------------------------------------------------
 Principal      Loan Date    Maturity     Loan No    Call  Collateral   Account    Officer   Initials
$500,000.00     10-30-1996  07-30-1997     605740              73         6271       JCH        
- -----------------------------------------------------------------------------------------------------------------------------------
   References in the shaded area are for Lender's use only and do not limit the applicability of this document to any particular 
loan or item.
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE> 

BORROWER: Diamond Tech One, Inc. (TIN: 760273345) LENDER: Austin National Bank
          12100 Technology Blvd.                          2110 Boca Raton Drive
          Austin, TX 78727                                Austin, TX  78747

================================================================================

PRINCIPAL AMOUNT:$500,000.00 INITIAL RATE:10.000% DATE OF NOTE:OCTOBER 30, 1996

PROMISE TO PAY. DIAMOND TECH ONE, INC. ("BORROWER") PROMISES TO PAY TO AUSTIN 
NATIONAL BANK ("LENDER"), OR ORDER, IN LAWFUL MONEY OF THE UNITED STATES OF 
AMERICA, THE PRINCIPAL AMOUNT OF FIVE HUNDRED THOUSAND & 00/100 DOLLARS 
($500,000.00) OR SO MUCH AS MAY BE OUTSTANDING, TOGETHER WITH INTEREST ON THE 
UNPAID OUTSTANDING PRINCIPAL BALANCE OF EACH ADVANCE.  INTEREST SHALL BE 
CALCULATED FROM THE DATE OF EACH ADVANCE UNTIL REPAYMENT OF EACH ADVANCE OR 
MATURITY, WHICHEVER OCCURS FIRST.  THE INTEREST RATE WILL NOT INCREASE ABOVE 
18.000%.

CHOICE OF USURY CEILING AND INTEREST RATE.  The interest rate on this Note has 
been implemented under the "Indicated Rate Ceiling" as referred to in Article 
5069-1.04 (a)(1) V.T.C.S.  The terms, including the rate, or index, formula, or 
provision of law used to compute the rate on the Note, will be subject to 
revision as to current and future balances, from time to time by notice from 
Lender in compliance with Article 5069-1.04(i) V.T.C.S.

PAYMENT.  BORROWER WILL PAY THIS LOAN ON DEMAND, OR IF NO DEMAND IS MADE, IN ONE
PAYMENT OF ALL OUTSTANDING PRINCIPAL PLUS ALL ACCRUED UNPAID INTEREST ON JULY 
30, 1997.  IN ADDITION, BORROWER WILL PAY REGULAR QUARTERLY PAYMENTS OF ACCRUED 
UNPAID INTEREST BEGINNING JANUARY 30, 1997, AND ALL SUBSEQUENT INTEREST PAYMENTS
ARE DUE ON THE SAME DAY OF EACH QUARTER AFTER THAT.  Interest on this Note is 
computed on a 365/360 simple interest basis; that is, by applying the ratio of 
the annual interest rate over a year of 360 days, multiplied by the outstanding 
principal balance, multiplied by the actual number of days the principal balance
is outstanding, unless such calculation would result in a usurious rate, in 
which case interest shall be calculated on a per diem basis of a year of 365 or 
366 days, as the case may be.  Borrower will pay Lender at Lender's address 
shown above or at such other place as Lender may designate in writing.  Unless 
otherwise agreed or required by applicable law, payments will be applied first 
to accrued unpaid interest, then to principal, and any remaining amount to any 
unpaid collection costs and late charges.  Notwithstanding any other provision 
of this Note, Lender will not charge interest on any undisbursed loan proceeds. 
No scheduled payment, whether of principal or interest or both, will be due 
unless sufficient loan funds have been disbursed by the scheduled payment date 
to justify the payment.

VARIABLE INTEREST RATE.  The interest rate on this Note is subject to change 
from time to time based on changes in an index which is the Austin National Bank
Base Rate (the "index").  The Index is not necessarily the lowest rate charged 
by Lender on its loans and is set by Lender in its sole discretion.  If the 
Index becomes unavailable during the term of this loan, Lender may designate a 
substitute index after notifying Borrower.  Lender will tell Borrower the 
current Index rate upon Borrower's request.  Borrower understands that Lender 
may make loans based on other rates as well.  The interest rate change will not 
occur more often than each Day.  THE INDEX CURRENTLY IS 10.000% PER ANNUM.  THE 
INTEREST RATE TO BE APPLIED PRIOR TO MATURITY TO THE UNPAID PRINCIPAL BALANCE OF
THIS NOTE WILL BE AT A RATE EQUAL TO THE INDEX, ADJUSTED IF NECESSARY FOR THE 
MAXIMUM RATE LIMITATION DESCRIBED BELOW, RESULTING IN AN INITIAL RATE OF 10.000%
PER ANNUM.  NOTWITHSTANDING ANY OTHER PROVISION OF THIS NOTE, THE VARIABLE 
INTEREST RATE OR RATES PROVIDED FOR IN THIS NOTE WILL BE SUBJECT TO THE 
FOLLOWING MAXIMUM RATE.  NOTICE:  Under no circumstances will the interest rate 
on this Note be more than (except for any higher default rate or Post Maturity 
Rate shown below) the lesser of 18.000% per annum or the maximum rate allowed by
applicable law.  For purposes of this Note, the "maximum rate allowed by 
applicable law" means the greater of (a) the maximum rate of interest permitted 
under federal or other law applicable to the indebtedness evidenced by this 
Note, or (b) the "Indicated Rate Ceiling" as referred to in Article 5069-1.04 
(a)(1) V.T.C.S.

PREPAYMENT.  Borrower may pay without penalty all or a portion of the amount 
owed earlier than it is due.  Early payments will not, unless agreed to by 
Lender in writing, relieve Borrower of Borrower's obligation to continue to make
payments of accrued unpaid interest.  Rather, they will reduce the principal 
balance due.

POST MATURITY RATE.  The Post Maturity Rate on this Note is the lesser of the 
maximum rate allowed by applicable law or 5.000 percentage points over the 
Index.  Borrower will pay interest on all sums due after final maturity, whether
by acceleration or otherwise, at that rate, with the exception of any amounts 
added to the principal balance of this Note based on lender's payment of 
insurance premiums, which will continue to accrue interest at the pre-maturity 
rate.

DEFAULT.  Borrower will be in default if any of the following happens: (a) 
Borrower fails to make any payment when due.  (b) Borrower breaks any promise 
Borrower has made to Lender, or Borrower fails to comply with or to perform when
due any other term, obligation, covenant, or condition contained in this Note or
any agreement related to this Note, or in any other agreement or loan Borrower 
has with Lender.  (c) Any representation or statement made or furnished to 
Lender by Borrower or on Borrower's behalf is false or misleading in any 
material respect either now or at the time made or furnished.  (d) Borrower 
becomes insolvent, a receiver is appointed for any part of Borrower's property, 
Borrower makes an assignment for the benefit of creditors, or any proceeding is 
commenced either by Borrower or against Borrower under any bankruptcy or 
insolvency laws.  (e) Any creditor tries to take any of Borrower's property on 
or in which Lender has a lien or security interest.  This includes a garnishment
of any of Borrower's accounts with Lender.  (f) Any guarantor dies or any of the
other events described in this default section occurs with respect to any 
guarantor of this Note.  (g) A material adverse change occurs in Borrower's 
financial condition, or Lender believes the prospect of payment or performance 
of the indebtedness is impaired.  (h) Lender in good faith deems itself 
insecure.

If any default, other than a default in payment, is curable, it may be cured 
(and no event of default will have occurred) if Borrower, after receiving 
written notice from Lender demanding cure of such default: (a) cures the default
within fifteen (15) days; or (b) if the cure requires more than fifteen (15) 
days, immediately initiates steps which Lender deems in Lender's sole discretion
to be sufficient to cure the default and thereafter continues and completes all 
reasonable and necessary steps sufficient to produce compliance as soon as 
reasonably practical.

LENDER'S RIGHTS.  Upon default, Lender may declare the entire indebtedness, 
including the unpaid principal balance on this Note, all accrued unpaid 
interest, and all other amounts, costs and expenses for which Borrower is 
responsible under this Note or any other agreement with Lender pertaining to 
this loan, immediately due, without notice, and then Borrower will pay that 
amount.  Lender may hire an attorney to help collect this Note if Borrower does
not pay, and Borrower will pay Lender's reasonable attorneys' fees.  Borrower 
also will pay Lender all other amounts actually incurred by Lender as court 
costs, lawful fees for filing, recording, or releasing to any public office any 
instrument securing this loan; the reasonable cost actually


<PAGE>
 
  10-30-1996                    PROMISSORY NOTE                           PAGE 2
LOAN NO 605740                    (CONTINUED)
===============================================================================

expended for repossessing, storing, preparing for sale, and selling any 
security; and fees for noting a lien on or transferring a certificate of title 
to any motor vehicle offered as security for this loan, or premiums or 
identifiable charges received in connection with the sale of authorized 
insurance.  THIS NOTE HAS BEEN DELIVERED TO LENDER AND ACCEPTED BY LENDER IN THE
STATE OF TEXAS.  IF THERE IS A LAWSUIT, AND IF THE TRANSACTION EVIDENCED BY THIS
NOTE OCCURRED IN TRAVIS COUNTY, BORROWER AGREES UPON LENDER'S REQUEST TO SUBMIT 
TO THE JURISDICTION OF THE COURTS OF TRAVIS COUNTY, THE STATE OF TEXAS.  THIS 
NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE
OF TEXAS AND APPLICABLE FEDERAL LAWS.

DISHONORED CHECK CHARGE.  Borrower will pay a processing fee of $25.00 if any 
check given by Borrower to Lender as a payment on this loan is dishonored.

RIGHT OF SETOFF.  Borrower grants to Lender a contractual possessory security 
interest in, and hereby assigns, conveys, delivers, pledges, and transfers to 
Lender all Borrower's right, title and interest in and to, Borrower's accounts 
with Lender (whether checking, savings, or some other account), including 
without limitation all accounts held jointly with someone else and all accounts 
Borrower may open in the future, excluding however all IRA and Keogh accounts, 
and all trust accounts for which the grant of a security interest would be 
prohibited by law.  Borrower authorizes Lender, to the extent permitted by 
applicable law, to charge or setoff all sums owing on this Note against any and 
all such accounts.

COLLATERAL.  This Note is secured by all equipment now owned or hereafter 
acquired owned by Diamond Tech One, Inc.

LINE OF CREDIT.  This Note evidences a revolving line of credit.  Advances under
this Note may be requested either orally or in writing by Borrower or by an 
authorized person.  Lender may, but need not, require that all oral requests be 
confirmed in writing.  All communications, instructions, or directions by 
telephone or otherwise to Lender are to be directed to Lender's office shown 
above.  The following party or parties are authorized to request advances under 
the line of credit until Lender receives from Borrower at Lender's address shown
above written notice of revocation of their authority: MARC ELLER, CHAIRMAN OF 
THE BOARD & CEO; TREY FECTEAU, SR. VICE PRESIDENT; AND DOUGLAS P. BAKER, VICE 
PRESIDENT & CFO.  Borrower agrees to be liable for all sums either: (a) advanced
in accordance with the instructions of an authorized person or (b) credited to 
any of Borrower's accounts with Lender.  The unpaid principal balance owing on 
this Note at any time may be evidenced by endorsements on this Note or by 
Lender's internal records, including daily computer print-outs.  Lender will 
have no obligation to advance funds under this Note if: (a) Borrower or any 
guarantor is in default under the terms of this Note or any agreement that 
Borrower or any guarantor has with Lender, including any agreement made in 
connection with the signing of this Note; (b) Borrower or any guarantor ceases 
doing business or is insolvent; (c) any guarantor seeks, claims or otherwise 
attempts to limit, modify or revoke such guarantor's guarantee of this Note or 
any other loan with Lender; (d) Borrower has applied funds provided pursuant to 
this Note for purposes other than those authorized by Lender; or (e) Lender in 
good faith deems itself insecure under this Note or any other agreement between 
Lender and Borrower.  THIS REVOLVING LINE OF CREDIT SHALL NOT BE SUBJECT TO 
CHAPTER 15, ARTICLE 5069 V.T.C.S. (THE TEXAS CREDIT CODE).

GENERAL PROVISIONS.  This Note is payable on demand.  The inclusion of specific 
default provisions or rights of Lender shall not preclude Lender's right to 
declare payment of this Note on its demand.  If any part of this Note cannot be 
enforced, this fact will not affect the rest of the Note.  In particular, this 
section means (among other things) that Borrower does not agree or intend to 
pay, and Lender does not agree or intend to contract for, charge, collect, take,
reserve or receive (collectively referred to herein as "charge or collect"), any
amount in the nature of interest or in the nature of a fee for this loan, which 
would in any way or event (including demand, prepayment, or acceleration) cause 
Lender to charge or collect more for this loan than the maximum Lender would be 
permitted to charge or collect by federal law or the law of the State of Texas 
(as applicable).  Any such excess interest or unauthorized fee shall, instead of
anything stated to the contrary, be applied first to reduce the principal 
balance of this loan, and when the principal has been paid in full, be refunded 
to Borrower.  The right to accelerate maturity of sums due under this Note does 
not include the right to accelerate any interest which has not otherwise accrued
on the date of such acceleration, and Lender does not intend to charge or 
collect any unearned interest in the event of acceleration.  All sums paid or 
agreed to be paid to Lender for the use, forebearance or detention of sums due 
hereunder shall, to the extent permitted by applicable law, be amortized, 
prorated, allocated and spread throughout the full term of the loan evidenced by
this Note until payment in full so that the rate or amount of interest on 
account of the loan evidenced hereby does not exceed the applicable usury 
ceiling.  Lender may delay or forgo enforcing any of its rights or remedies 
under this Note without losing them.  Borrower and any other person who signs, 
guarantees or endorses this Note, to the extent allowed by law, waive 
presentment, demand for payment, protest, notice of dishonor, notice of intent 
to accelerate the maturity of this Note, and notice of acceleration of the 
maturity of this Note.  Upon any change in the terms of this Note, and unless 
otherwise expressly stated in writing, no party who signs this Note, whether as 
maker, guarantor, accommodation maker or endorser, shall be released from 
liability.  All such parties agree that Lender may renew or extend (repeatedly 
and for any length of time) this loan, or release any party or guarantor or 
collateral; or impair, fail to realize upon or perfect Lender's security 
interest in the collateral without the consent of or notice to anyone.  All such
parties also agree that Lender may modify this loan without the consent of or 
notice to anyone other than the party with whom the modification is made.

PRIOR TO SIGNING THIS NOTE, BORROWER READ AND UNDERSTOOD ALL THE PROVISIONS OF 
THIS NOTE, INCLUDING THE VARIABLE INTEREST RATE PROVISIONS.  BORROWER AGREES TO 
THE TERMS OF THE NOTE AND ACKNOWLEDGES RECEIPT OF A COMPLETED COPY OF THE NOTE.

BORROWER:

DIAMOND TECH ONE, INC.

   COPY
BY:
   ---------------------------------------
   DOUGLAS P. BAKER, VICE PRESIDENT & CFO

===============================================================================


<PAGE>
                                                                    EXHIBIT 10.6

                              COMMERCIAL GUARANTY

<TABLE> 
<S>             <C>         <C>           <C>        <C>   <C>          <C>        <C>       <C> 
- -----------------------------------------------------------------------------------------------------------------------------------
  PRINCIPAL   LOAN DATE   MATURITY      LOAN NO    CALL  COLLATERAL   ACCOUNT    OFFICER   INITIALS
                                                              73         6271        JCH        
- -----------------------------------------------------------------------------------------------------------------------------------
   References in the shaded area are for Lender's use only and do not limit the
applicability of this document to any particular loan or item.
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE> 

BORROWER: Diamond Tech One, Inc. (TIN: 760273345) LENDER: Austin National Bank
          12100 Technology Blvd.                          2110 Boca Raton Drive
          Austin, TX  78727                               Austin, TX  78747

GUARANTOR: SI Diamond Technology, Inc.
           12100 Technology Blvd.
           Austin, TX 78727
===============================================================================

AMOUNT OF GUARANTY.  THIS IS A GUARANTY OF PAYMENT OF THE NOTE, INCLUDING 
WITHOUT LIMITATION THE PRINCIPAL NOTE AMOUNT OF FIVE HUNDRED THOUSAND & 00/100 
DOLLARS ($500,000.00).

GUARANTY.  FOR GOOD AND VALUABLE CONSIDERATION, SI DIAMOND TECHNOLOGY, INC. 
("GUARANTOR") ABSOLUTELY AND UNCONDITIONALLY GUARANTEES AND PROMISES TO PAY TO 
AUSTIN NATIONAL BANK ("LENDER") OR ITS ORDER, ON DEMAND, IN LEGAL TENDER OF THE 
UNITED STATES OF AMERICA, THE INDEBTEDNESS (AS THAT TERM IS DEFINED BELOW) OF 
DIAMOND TECH ONE, INC. ("BORROWER") TO LENDER ON THE TERMS AND CONDITIONS SET 
FORTH IN THIS GUARANTY.

DEFINITIONS.  The following words shall have the following meanings when used 
in this Guaranty:

        BORROWER.  The word "Borrower" means Diamond Tech One, Inc.

        GUARANTOR. The word "Guarantor" means SI Diamond Technology, Inc.

        GUARANTY.  The word "Guaranty" means this Guaranty made by Guarantor for
        the benefit of Lender dated October 30, 1996.

        INDEBTEDNESS. The word "Indebtedness" means the Note, including (a) all
        principal, (b) all interest, (c) all late charges, (d) all loan fees and
        loan charges, and (e) all collection costs and expenses relating to the
        Note or to any collateral for the Note. Collection costs and expenses
        include without limitation all Lender's attorneys' fees and Lender's
        legal expenses, whether or not suit is instituted, and attorneys' fees
        and legal expenses for bankruptcy proceedings (including efforts to
        modify or vacate any automatic stay or injunction), appeals, and any
        anticipated post-judgment collection services.

        LENDER.  The word "Lender" means Austin National Bank, its successors 
        and assigns.

        NOTE. The word "Note" means the promissory note or credit agreement
        dated October 30, 1996, in the original principal amount of $500,000.00
        from Borrower to Lender, together with all renewals of, extensions of,
        modifications of, refinancings of, consolidations of, and substitutions
        for the promissory note or agreement.

        RELATED DOCUMENTS. The words "Related Documents" mean and include
        without limitation all promissory notes, credit agreements, loan
        agreements, environmental agreements, guaranties, security agreements,
        mortgages, deeds of trust, and all other instruments, agreements and
        documents, whether now or hereafter existing, executed in connection
        with the Indebtedness.

MAXIMUM LIABILITY.  THE MAXIMUM LIABILITY OF GUARANTOR UNDER THIS GUARANTY SHALL
NOT EXCEED AT ANY ONE TIME THE AMOUNT OF THE INDEBTEDNESS DESCRIBED ABOVE, PLUS 
ALL COSTS AND EXPENSES OF (A) ENFORCEMENT OF THIS GUARANTY AND (B) COLLECTION 
AND SALE OF ANY COLLATERAL SECURING THIS GUARANTY.

The above limitation on liability is not a restriction on the amount of the 
Indebtedness of Borrower to Lender either in the aggregate or at any one time.  
If Lender presently holds one or more guaranties, or hereafter receives 
additional guaranties from Guarantor, the rights of Lender under all guaranties 
shall be cumulative.  This Guaranty shall not (unless specifically provided 
below to the contrary) affect or invalidate any such other guaranties.  The 
liability of Guarantor will be the aggregate liability of Guarantor under the 
terms of this Guaranty and any such other unterminated guaranties.

NATURE OF GUARANTY.  Guarantor intends to guarantee at all times the performance
and prompt payment when due, whether at maturity or earlier by reason of 
acceleration or otherwise, of all Indebtedness within the limits set forth in 
the preceding section of this Guaranty.

DURATION OF GUARANTY.  This Guaranty will take effect when received by Lender 
without the necessity of any acceptance by Lender, or any notice to Guarantor or
to Borrower, and will continue in full force until all Indebtedness shall have 
been fully and finally paid and satisfied and all other obligations of Guarantor
under this Guaranty shall have been performed in full.  Release of any other 
guarantor or termination of any other guaranty of the Indebtedness shall not 
affect the liability of Guarantor under this Guaranty.  A revocation received by
Lender from any one or more Guarantors shall not affect the liability of any 
remaining Guarantors under this Guaranty.

GUARANTOR'S AUTHORIZATION TO LENDER.  Guarantor authorizes Lender, without 
notice or demand and without lessening or otherwise affecting Guarantor's 
liability under this Guaranty, from time to time: (a) to make one or more 
additional secured or unsecured loans to Borrower, to lease equipment or other 
goods to Borrower, or otherwise to extend additional credit to Borrower; (b) to 
alter, compromise, renew, extend, accelerate, or otherwise change one or more 
times the time for payment or other terms of the Indebtedness or any part of the
Indebtedness, including increases and decreases of the rate of Interest on the 
Indebtedness; extensions may be repeated and may be for longer than the original
loan term; (c) to take and hold security for the payment of this Guaranty or the
Indebtedness, and exchange, enforce, waive, subordinate, fall or decide not to 
perfect, and release any such security, with or without the substitution of new 
collateral; (d) to release, substitute, agree not to sue, or deal with any one 
or more of Borrower's sureties, endorsers, or other guarantors on any terms or 
in any manner Lender may choose; (e) to determine how, when and what application
of payments and credits shall be made on the Indebtedness; (f) to apply such 
security and direct the order or manner of sale thereof, including without 
limitation, any nonjudicial sale permitted by the terms of the controlling 
security agreement or deed of trust, as Lender in its discretion may determine; 
(g) to sell, transfer, assign, or grant participations in all or any part of the
Indebtedness; and (h) to assign or transfer this Guaranty in whole or in part.

GUARANTOR'S REPRESENTATIONS AND WARRANTIES.  Guarantor represents and warrants 
to Lender that (a) no representations or agreements of any kind have been made 
to Guarantor which would limit or qualify in any way the terms of this Guaranty;
(b) this Guaranty is executed at Borrower's request and not at the request of 
Lender; (c) Guarantor has full power, right and authority to enter into this 
Guaranty; (d) the provisions of this Guaranty do not conflict with or result in 
a default under any agreement or other instrument binding upon Guarantor and do 
not result in a violation of any law, regulation, court decree or order 
applicable to Guarantor; (e) Guarantor has not and will not, without the prior 
written consent of Lender, sell, lease, assign, encumber, hypothecate, transfer,
or otherwise dispose of all or substantially all of Guarantor's assets, or any 
Interest therein; (f) upon Lender's request, Guarantor will provide to Lender 
financial and credit information in form acceptable to Lender, and all such 
financial information which currently has been, and all future financial 
information which will be provided to Lender is and will be true and correct in 
all material respects and fairly present the financial condition of Guarantor as
of the dates the financial information is provided; (g) no material adverse 
change has occurred in Guarantor's financial condition since the date of the 
most recent financial statements provided to Lender and no event has occurred 
which may materially adversely affect Guarantor's financial condition; (h) no 
litigation, claim, investigation, administrative proceeding or similar action 
(including

<PAGE>
 
  10-30-1996                    COMMERCIAL GUARANTY                       PAGE 2
LOAN NO 605740                      (CONTINUED)
================================================================================

those for unpaid taxes) against Guarantor is pending or threatened; (i) Lender 
has made no representation to Guarantor as to the creditworthiness of Borrower; 
and (j) Guarantor has established adequate means of obtaining from Borrower on a
continuing basis information regarding Borrower's financial condition.  
Guarantor agrees to keep adequately informed from such means of any facts, 
events, or circumstances which might in any way affect Guarantor's risks under 
this Guaranty, and Guarantor further agrees that, absent a request for 
information, Lender shall have no obligation to disclose to Guarantor any 
information or documents acquired by Lender in the course of its relationship 
with Borrower.

GUARANTOR'S WAIVERS.  Except as prohibited by applicable law, Guarantor waives 
any right to require Lender (a) to continue lending money or to extend other 
credit to Borrower; (b) to make any presentment, protest, demand, or notice of 
any kind, including notice of any nonpayment of the Indebtedness or of any 
nonpayment related to any collateral, or notice of any action or nonaction on 
the part of Borrower, Lender, any surety, endorser, or other guarantor in 
connection with the Indebtedness or in connection with the creation of new or 
additional loans or obligations; (c) to resort for payment or to proceed 
directly or at once against any person, including Borrower or any other 
guarantor; (d) to proceed directly against or exhaust any collateral held by 
Lender from Borrower, any other guarantor, or any other person; (e) to give 
notice of the terms, time, and place of any public or private sale of personal 
property security held by Lender from Borrower or to comply with any other 
applicable provisions of the Uniform Commercial Code; (f) to pursue any other 
remedy within Lender's power; or (g) to commit any act or omission of any kind, 
or at any time, with respect to any matter whatsoever.

If now or hereafter (a) Borrower shall be or become insolvent, and (b) the 
Indebtedness shall not at all times until paid be fully secured by collateral 
pledged by Borrower, Guarantor hereby forever waives and relinquishes in favor 
of Lender and Borrower, and their respective successors, any claim or right to 
payment Guarantor may now have hereafter have or acquire against Borrower, by 
subrogation or otherwise, so that at no time shall Guarantor be or become a 
"creditor" of Borrower within the meaning of 11 U.S.C. section 547(b), or any 
successor provision of the Federal bankruptcy laws.

Guarantor waives all rights of Guarantor under Chapter 34 of the Texas Business
and Commerce Code. Guarantor also waives any and all rights or defenses arising
by reason of (a) any "one action" or "anti-deficiency" law or any other law
which may prevent Lender from bringing any action, including a claim for
deficiency, against Guarantor, before or after Lender's commencement or
completion of any foreclosure action, either judicially or by exercise of a
power of sale; (b) any election of remedies by Lender which destroys or
otherwise adversely affects Guarantor's subrogation rights or Guarantor's rights
to proceed against Borrower for reimbursement, including without limitation, any
loss of rights Guarantor may suffer by reason of any law limiting, qualifying,
or discharging the Indebtedness; (c) any disability or other defense of
Borrower, of any other guarantor, or of any other person, or by reason of the
cessation of Borrower's liability from any cause whatsoever, other than payment
in full in legal tender, of the Indebtedness; (d) any right to claim discharge
of the Indebtedness on the basis of unjustified impairment of any collateral for
the Indebtedness; (e) any statute of limitations, if at any time any action or
suit brought by Lender against Guarantor is commenced there is outstanding
Indebtedness of Borrower to Lender which is not barred by any applicable statute
of limitations; or (f) any defenses given to guarantors at law or in equity
other than actual payment and performance of the Indebtedness. If payment is
made by Borrower, whether voluntarily or otherwise, or by any third party, on
the Indebtedness and thereafter Lender is forced to remit the amount of that
payment to Borrower's trustee in bankruptcy or to any similar person under any
federal or state bankruptcy law or law for the relief of debtors, the
Indebtedness shall be considered unpaid for the purpose of enforcement of this
Guaranty.

Guarantor further waives and agrees not to assert or claim at any time any 
deductions to the amount guaranteed under this Guaranty for any claim of setoff,
counterclaim, counter demand, recoupment or similar right, whether such claim 
demand or right may be asserted by the Borrower, the Guarantor, or both.

GUARANTOR'S UNDERSTANDING WITH RESPECT TO WAIVERS.  Guarantor warrants and 
agrees that each of the waivers set forth above is made with Guarantor's full 
knowledge of its significance and consequences and that, under the 
circumstances, the waivers are reasonable and not contrary to public policy or 
law.  If any such waiver is determined to be contrary to any applicable law or 
public policy, such waiver shall be effective only to the extent permitted by 
law or public policy.

LENDER'S RIGHT OF SETOFF.  In addition to all liens upon and rights of setoff 
against the moneys, securities or other property of Guarantor given to Lender by
law, Lender shall have, with respect to Guarantor's obligations to Lender under 
this Guaranty and to the extent permitted by law, a contractual possessory 
security interest in and a right of setoff against, and Guarantor hereby 
assigns, conveys, delivers, pledges, and transfers to Lender all of Guarantor's 
right, title and interest in and to, all deposits, moneys, securities and other 
property of Guarantor now or hereafter in the possession of or on deposit with 
Lender, whether held in a general or special account or deposit, whether held 
jointly with someone else, or whether held for safekeeping or otherwise, 
excluding however all IRA, Keogh, and trust accounts.  Every such security 
interest and right of setoff may be exercised without demand upon or notice to 
Guarantor.  No security interest or right of setoff shall be deemed to have been
waived by any act or conduct on the part of Lender or by any neglect to exercise
such right of setoff or to enforce such security interest or by any delay in so 
doing.  Every right of setoff and security interest shall continue in full force
and effect until such right of setoff or security interest is specifically 
waived or released by an instrument in writing executed by Lender.

SUBORDINATION OF BORROWER'S DEBTS TO GUARANTOR. Guarantor agrees that the
Indebtedness of Borrower to Lender, whether now existing or hereafter created,
shall be prior to any claim that Guarantor may now have or hereafter acquire
against Borrower, whether or not Borrower becomes insolvent. Guarantor hereby
expressly subordinates any claim Guarantor may have against Borrower, upon any
account whatsoever, to any claim that Lender may now or hereafter have against
Borrower. In the event of insolvency and consequent liquidation of the assets of
Borrower, through bankruptcy, by an assignment for the benefit of creditors, by
voluntary liquidation, or otherwise, the assets of Borrower applicable to the
payment of the claims of both Lender and Guarantor shall be paid to Lender and
shall be first applied by Lender to the Indebtedness of Borrower to Lender.
Guarantor does hereby assign to Lender all claims which it may have or acquire
against Borrower or against any assignee or trustee in bankruptcy of Borrower;
provided however, that such assignment shall be effective only for the purpose
of assuring to Lender full payment in legal tender of the Indebtedness. If
Lender so requests, any notes or credit agreements now or hereafter evidencing
any debts or obligations of Borrower to Guarantor shall be marked with a legend
that the same are subject to this Guaranty and shall be delivered to Lender.
Guarantor agrees, and Lender is hereby authorized, in the name of Guarantor,
from time to time to execute and file financing statements and continuation
statements and to execute such other documents and to take such other actions as
Lender deems necessary or appropriate to perfect, preserve and enforce its
rights under this Guaranty.

MISCELLANEOUS PROVISIONS.  The following miscellaneous provisions are a part of 
this Guaranty:

        AMENDMENTS. This Guaranty, together with any Related Documents,
        constitutes the entire understanding and agreement of the parties as to
        the matters set forth in this Guaranty. No alteration of or amendment to
        this Guaranty shall be effective unless given in writing and signed by
        the party or parties sought to be charged or bound by the alteration or
        amendment.

        APPLICABLE LAW. This Guaranty has been delivered to Lender and accepted
        by Lender in the State of Texas. If there is a lawsuit, and if the
        transaction evidenced by this Guaranty occurred in Travis County,
        Guarantor agrees upon Lender's request to submit to the jurisdiction
        of the courts of Travis County, State of Texas. This Guaranty shall be
        governed by and construed in accordance with the laws of the State of
        Texas and applicable Federal laws.

        ATTORNEYS' FEES. In addition to the amount of this Guaranty set forth
        above, Lender may hire an attorney to help enforce this Guaranty if
        Guarantor does not pay, and Guarantor will pay Lender's reasonable
        attorneys' fees. Guarantor also will pay Lender all other amounts
        actually incurred by Lender as court costs, lawful fees for filing,
        recording, or releasing to any public office any instrument securing
        this Guaranty; the

<PAGE>
 
  10-30-1996                    COMMERCIAL GUARANTY                       PAGE 3
LOAN NO 605740                      (CONTINUED)
================================================================================

reasonable cost actually expended for repossessing, storing, preparing for sale,
and selling any security; and fees for noting a lien on or transferring a
certificate of title to any motor vehicle offered as security for this Guaranty.

NOTICES.  All notices required to be given by either party to the other under 
this Guaranty shall be in writing, may be sent by telefacsimile, and shall be 
effective when actually delivered or when deposited with a nationally recognized
overnight courier, or when deposited in the United States mail, first class 
postage prepaid, addressed to the party to whom the notice is to be given at the
address shown above or to such other addresses as either party may designate to 
the other in writing.  If there is more than one Guarantor, notice to any 
Guarantor will constitute notice to all Guarantors.  For notice purposes, 
Guarantor agrees to keep Lender informed at all times of Guarantor's current 
address.

INTERPRETATION.  In all cases where there is more than one Borrower or 
Guarantor, then all words used in this Guaranty in the singular shall be deemed 
to have been used in the plural where the context and construction so require; 
and where there is more than one Borrower named in this Guaranty or when this 
Guaranty is executed by more than one Guarantor, the words "Borrower" and 
"Guarantor" respectively shall mean all and any one or more of them.  The words 
"Guarantor," "Borrower," and "Lender" include the heirs, successors, assigns, 
and transferees of each of them.  Caption headings in this Guaranty are for 
convenience purposes only and are not to be used to interpret or define the 
provisions of this Guaranty.  If a court of competent jurisdiction finds any 
provision of this Guaranty to be invalid or unenforceable as to any person or 
circumstance, such finding shall not render that provision invalid or 
unenforceable as to any other persons or circumstances, and all provisions of 
this Guaranty in all other respects shall remain valid and enforceable.  If any 
one or more of Borrower or Guarantor are corporations or partnerships, it is not
necessary for Lender to inquire into the powers of Borrower or Guarantor or of 
the officers, directors, partners, or agents acting or purporting to act on 
their behalf, and any Indebtedness made or created in reliance upon the 
professed exercise of such powers shall be guaranteed under this Guaranty.

WAIVER.  Lender shall not be deemed to have waived any rights under this 
Guaranty unless such waiver is given in writing and signed by Lender.  No delay 
or omission on the part of Lender in exercising any right shall operate as a 
waiver of such right or any other right.  A waiver by Lender of a provision of 
this Guaranty shall not prejudice or constitute a waiver of Lender's right 
otherwise to demand strict compliance with that provision or any other provision
of this Guaranty.  No prior waiver by Lender, nor any course of dealing between 
Lender and Guarantor, shall constitute a waiver of any of Lender's rights or of 
any of Guarantor's obligations as to any future transactions.  Whenever the 
consent of Lender is required under this Guaranty, the granting of such consent 
by Lender in any instance shall not constitute continuing consent to subsequent 
instances where such consent is required and in all cases such consent may be 
granted or withheld in the sole discretion of Lender.

EACH UNDERSIGNED GUARANTOR ACKNOWLEDGES HAVING READ ALL THE PROVISIONS OF THIS 
GUARANTY AND AGREES TO ITS TERMS.  IN ADDITION, EACH GUARANTOR UNDERSTANDS THAT 
THIS GUARANTY IS EFFECTIVE UPON GUARANTOR'S EXECUTION AND DELIVERY OF THIS 
GUARANTY TO LENDER AND THAT THE GUARANTY WILL CONTINUE UNTIL TERMINATED IN THE 
MANNER SET FORTH IN THE SECTION TITLED "DURATION OF GUARANTY."  NO FORMAL 
ACCEPTANCE BY LENDER IS NECESSARY TO MAKE THIS GUARANTY EFFECTIVE.  THIS 
GUARANTY IS DATED OCTOBER 30, 1996.

GUARANTOR:

SI DIAMOND TECHNOLOGY, INC.

BY:
   -----------------------------------------
   DOUGLAS P. BAKER, VICE PRESIDENT AND CFO


================================================================================



<PAGE>
 
AUSTIN                                                              EXHIBIT 10.7
NATIONAL
BANK

                         COMMERCIAL SECURITY AGREEMENT
<TABLE> 
<CAPTION> 

<S>                <C>            <C>           <C>         <C>        <C>               <C>           <C>           <C> 
- ------------------------------------------------------------------------------------------------------------------------------------
     PRINCIPAL     LOAN DATE      MATURITY      LOAN NO      CALL      COLLATERAL        ACCOUNT       OFFICER       INITIALS      
    $500,000.00    10-30-1996     07-30-1997     605740                    73             6271           JCH
- ------------------------------------------------------------------------------------------------------------------------------------
   References in the shaded area are for Lender's use only and do not limit the applicability of this document to any particular 
   loan or item.
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE> 
<TABLE> 
<CAPTION>
<S>         <C>                                                                <C>       <C>   
BORROWER:   Diamond Tech One, Inc. (TIN:  760273345)                           LENDER:   Austin National Bank
            12100 Technology Blvd.                                                       2110 Boca Raton Drive
            Austin  Tx  78727                                                            Austin, Tx 78747
====================================================================================================================================
</TABLE> 

THIS COMMERCIAL SECURITY AGREEMENT IS ENTERED INTO BETWEEN DIAMOND TECH ONE, 
INC. (REFERRED TO BELOW AS "GRANTOR"); AND AUSTIN NATIONAL BANK (REFERRED TO 
BELOW AS "LENDER").  FOR VALUABLE CONSIDERATION, GRANTOR GRANTS TO LENDER A 
SECURITY INTEREST IN THE COLLATERAL TO SECURE THE INDEBTEDNESS AND AGREES THAT 
LENDER SHALL HAVE THE RIGHTS STATED IN THIS AGREEMENT WITH RESPECT TO THE 
COLLATERAL, IN ADDITION TO ALL OTHER RIGHTS WHICH LENDER MAY HAVE BY LAW.

DEFINITIONS.  The following words shall have the following meanings when used in
this Agreement.  Terms not otherwise defined in this Agreement shall have the 
meanings attributed to such terms in the Uniform Commercial Code.  All 
references to dollar amounts shall mean amounts in lawful money of the United 
States of America.

     AGREEMENT. The word "Agreement" means this Commercial Security Agreement,
     as this Commercial Security Agreement may be amended or modified from time
     to time, together with all exhibits and schedules attached to this
     Commercial Security Agreement from time to time.

     COLLATERAL. The word "Collateral" means the following described property of
     Grantor, whether now owned or hereafter acquired, whether now existing or
     hereafter arising, and wherever located:

        ALL EQUIPMENT NOW OWNED OR HEREAFTER ACQUIRED OWNED BY DIAMOND
        TECH ONE, INC.

     In addition, the word "Collateral" includes all the following, whether now
     owned or hereafter acquired, whether now existing or hereafter arising, and
     wherever located:

        (a)  All attachments, accessions, accessories, tools, parts, supplies,
        increases, and additions to and all replacements of and substitutions
        for any property described above.

        (b)  All products and produce of any of the property described in this
        Collateral section.

        (c)  All accounts, general intangibles, instruments, rents, monies,
        payments, and all other rights, arising out of a sale, lease, or other
        disposition of any of the property described in this Collateral section.

        (d)  All proceeds (including insurance proceeds) from the sale,
        destruction, loss, or other disposition of any of the property described
        in this Collateral section.

        (e)  All records and data relating to any of the property described in
        this Collateral section, whether in the form of a writing, photograph,
        microfilm, microfiche, or electronic media, together with all of
        Grantor's right, title, and interest in and to all computer software
        required to utilize, create, maintain, and process any such records or
        data on electronic media.

     EVENT OF DEFAULT. The words "Event of Default" mean and include without
     limitation any of the Events of Default set forth below in the section
     titled "Events of Default."

     GRANTOR.  The word "Grantor" means Diamond Tech One, Inc., its successors 
     and assigns.

     GUARANTOR. The word "Guarantor" means and includes without limitation each
     and all of the guarantors, sureties, and accommodation parties in
     connection with the Indebtedness.

     INDEBTEDNESS. The word "Indebtedness" means the indebtedness evidenced by
     the Note, including all principal and earned interest, together with all
     other indebtedness and costs and expenses for which Grantor is responsible
     under this Agreement or under any of the Related Documents. In addition,
     the word "Indebtedness" includes all other obligations, debts and
     liabilities, plus interest thereon, of Grantor, or any one or more of them,
     to Lender, as well as all claims by Lender against Grantor, or any one or
     more of them, whether existing now or later; whether they are voluntary or
     involuntary, due or not due, direct or indirect, absolute or contingent,
     liquidated or unliquidated; whether Grantor may be liable individually or
     jointly with others; whether Grantor may be obligated as guarantor, surety,
     accommodation party or otherwise.

     LENDER.  The word "Lender" means Austin National Bank, its successors and 
     assigns.

     NOTE. The word "Note" means the note or credit agreement dated October 30,
     1996, in the principal amount of $500,000.00 from Diamond Tech One, Inc. to
     Lender, together with all renewals of , extensions of, modifications of,
     refinancings of, consolidations of and substitutions for the note or credit
     agreement.

     RELATED DOCUMENTS. The words "Related Documents" mean and include without
     limitation all promissory notes, credit agreements, loan agreements,
     environmental agreements, guaranties, security agreements, mortgages, deeds
     of trust, and all other instruments, agreements and documents, whether now
     or hereafter existing, executed in connection with the indebtedness.

RIGHT OF SETOFF.  Grantor hereby grants Lender a contractual possessory security
interest in and hereby assigns, conveys, delivers, pledges, and transfers all of
Grantor's right, title and interest in and to Grantor's accounts with Lender 
(whether checking, savings, or some other account), including all accounts held 
jointly with someone else and all accounts Grantor may open in the future, 
excluding, however, all IRA and Keogh accounts, and all trust accounts for which
the grant of a security interest would be prohibited by law.  Grantor authorizes
Lender, to the extent permitted by applicable law, to charge or setoff all 
Indebtedness against any and all such accounts.

OBLIGATIONS OF GRANTOR.  Grantor warrants and covenants to Lender as follows:

     ORGANIZATION.  Grantor is corporation which is duly organized, validly 
     existing, and in good standing under the laws of the State of Texas.

     AUTHORIZATION. The execution, delivery, and performance of this Agreement
     by Grantor have been duly authorized by all necessary action by Grantor and
     do not conflict with, result in a violation of, or constitute a default
     under (a) any provision of its articles of incorporation or organization,
     or bylaws, or any agreement or other instrument binding upon Grantor or (b)
     any law, governmental regulation, court decree, or order applicable to
     Grantor.

     PERFECTION OF SECURITY INTEREST. Grantor agrees to execute such financing
     statements and to take whatever other actions are requested by Lender to
     perfect and continue Lender's security interest in the Collateral. Upon
     request of Lender, Grantor will deliver to Lender any and all of the
     documents evidencing or constituting the Collateral, and Grantor will note
     Lender's interest upon any and all chattel paper if not delivered to Lender
     for possession by Lender. Grantor hereby appoints Lender as its irrevocable
     attorney-in-fact for the purpose of executing any documents necessary to
     perfect or to continue the security interest granted in this Agreement.
     Lender may at any time, and without further authorization from Grantor,
     file a carbon, photographic or other reproduction of any financing
     statement or of this Agreement for use as a financing statement. Grantor
     will reimburse Lender for all expenses for the perfection and the
     continuation of the perfection of Lender's security interest in the
     Collateral. Grantor promptly will notify Lender before any change in
     Grantor's name including any change to the assumed business names of
     Grantor. THIS IS A CONTINUING SECURITY AGREEMENT AND WILL CONTINUE IN
     EFFECT EVEN THOUGH ALL OR ANY PART OF THE INDEBTEDNESS IS PAID IN FULL AND
     EVEN THOUGH FOR A PERIOD OF TIME GRANTOR MAY NOT BE INDEBTED TO LENDER.

     NO VIOLATION. The execution and delivery of this Agreement will not violate
     any law or agreement governing Grantor or to which Grantor is a party, and
     its certificate or articles of incorporation and bylaws do not prohibit any
     term or condition of this Agreement.

     ENFORCEABILITY OF COLLATERAL. To the extent the Collateral consists of
     accounts, chattel paper, or general intangibles, the Collateral is
     enforceable in accordance with its terms, is genuine, and complies with
     applicable laws concerning form, content and manner of preparation and
     execution, and all persons appearing to be obligated on the Collateral have
     authority and capacity to contract and are in fact obligated as they appear
     to be on the Collateral.

     LOCATION OF THE COLLATERAL. Grantor, upon request of Lender, will deliver
     to Lender in form satisfactory to Lender a schedule of real properties and
     Collateral locations relating to Grantor's operations, including without
     limitation the following: (a) all real property owned or being purchased by
     Grantor; (b) all real property being rented or leased by Grantor; (c) all
     storage facilities owned, rented, leased, or being used by Grantor; and
<PAGE>
 
  10-30-1996              COMMERCIAL SECURITY AGREEMENT                   PAGE 2
LOAN NO 605740                     (CONTINUED)     
================================================================================

        (d) all other properties where Collateral is or may be located. Except
        in the ordinary course of its business, Grantor shall not remove the
        Collateral from its existing locations without the prior written consent
        of Lender.

        REMOVAL OF COLLATERAL. Grantor shall keep the Collateral (or to the
        extent the Collateral consists of intangible property such as accounts,
        the records concerning the Collateral) at Grantor's address shown above,
        or at such other locations as are acceptable to Lender. Except in the
        ordinary course of its business, including the sales of inventory,
        Grantor shall not remove the Collateral from its existing locations
        without the prior written consent of Lender. To the extent that the
        Collateral consists of vehicles, or other titled property, Grantor shall
        not take or permit any action which would require application for
        certificates of title for the vehicles outside the State of Texas,
        without the prior written consent of Lender.

        TRANSACTIONS INVOLVING COLLATERAL. Except for inventory sold or accounts
        collected in the ordinary course of Grantor's business, Grantor shall
        not sell, offer to sell, otherwise transfer or dispose of the
        Collateral. While Grantor is not in default under this Agreement,
        Grantor may sell inventory, but only in the ordinary course of its
        business and only to buyers who qualify as a buyer in the ordinary
        course of business. A sale in the ordinary course of Grantor's business
        does not include a transfer in partial or total satisfaction of a debt
        or any bulk sale. Grantor shall not pledge, mortgage, encumber or
        otherwise permit the Collateral to be subject to any lien, security
        interest, encumbrance, or charge, other than the security interest
        provided for in this Agreement, without the prior written consent of
        Lender. This includes security interests even if junior in right to the
        security interests granted under this Agreement. Unless waived by
        Lender, all proceeds from any disposition of the Collateral (for
        whatever reason) shall be held in trust for Lender and shall not be
        commingled with any other funds; provided however, this requirement
        shall not constitute consent by Lender to any sale or other disposition.
        Upon receipt, Grantor shall immediately deliver any such proceeds to
        Lender.

        TITLE. Grantor represents and warrants to Lender that it holds good and
        marketable title to the Collateral, free and clear of all liens and
        encumbrances except for the lien of this Agreement. No financing
        statement covering any of the Collateral is on file in any public office
        other than those which reflect the security interest created by this
        Agreement or to which Lender has specifically consented. Grantor shall
        defend Lender's rights in the Collateral against the claims and demands
        of all other persons.

        COLLATERAL SCHEDULES AND LOCATIONS. Insofar as the Collateral consists
        of inventory, Grantor shall deliver to Lender, as often as Lender shall
        require, such lists, descriptions, and designations of such Collateral
        as Lender may require to identify the nature, extent, and location of
        such Collateral. Such information shall be submitted for Grantor and
        each of its subsidiaries or related companies.

        MAINTENANCE AND INSPECTION OF COLLATERAL. Grantor shall maintain all
        tangible Collateral in good condition and repair. Grantor will not
        commit or permit damage to or destruction of the Collateral or any part
        of the Collateral. Lender and its designated representatives and agents
        shall have the right at all reasonable times to examine, inspect, and
        audit the Collateral wherever located. Grantor shall immediately notify
        Lender of all cases involving the return, rejection, repossession, loss
        or damage of or to any Collateral; of any request for credit or
        adjustment or of any other dispute arising with respect to the
        Collateral; and generally of all happenings and events affecting the
        Collateral or the value or the amount of the Collateral.

        TEXAS, ASSESSMENTS AND LIENS. Grantor will pay when due all taxes,
        assessments and liens upon the Collateral, its use or operation, upon
        this Agreement, upon any promissory note or notes evidencing the
        indebtedness, or upon any of the other Related Documents. Grantor may
        withhold any such payment or may elect to contest any lien if Grantor is
        in good faith conducting an appropriate proceeding to contest the
        obligation to pay and so long as Lender's interest in the Collateral is
        not jeopardized in Lender's sole opinion. If the Collateral is subjected
        to a lien which is not discharged within fifteen (15) days, Grantor
        shall deposit with Lender cash, a sufficient corporate surety bond or
        other security satisfactory to Lender in an amount adequate to provide
        for the discharge of the lien plus any interest, costs, attorneys' fees
        or other charges that could accrue as a result of foreclosure or sale of
        the Collateral. In any contest Grantor shall defend itself and Lender
        and shall satisfy any final adverse judgment before enforcement against
        the Collateral. Grantor shall name Lender as an additional obligee under
        any surety bond furnished in the contest proceedings.

        COMPLIANCE WITH GOVERNMENTAL REQUIREMENTS. Grantor shall comply promptly
        with all laws, ordinances, rules and regulations of all governmental
        authorities, now or hereafter in effect, applicable to the ownership,
        production, disposition, or use of the Collateral. Grantor may contest
        in good faith any such law, ordinance or regulation and withhold
        compliance during any proceeding, including appropriate appeals, so long
        as Lender's interest in the Collateral, in Lender's opinion, is not
        jeopardized.

        HAZARDOUS SUBSTANCES. Grantor represents and warrants that the
        Collateral never has been, and never will be so long as this Agreement
        remains a lien on the Collateral, used for the generation, manufacture,
        storage, transportation, treatment, disposal, release or threatened
        release of any hazardous waste or substance, as those terms are defined
        in the Comprehensive Environmental Response, Compensation, and Liability
        Act of 1980, as amended, 42 U.S.C. Section 9601, et seq. ("CERCLA"), the
        Superfund Amendments and Reauthorization Act of 1986, Pub. L. No. 99-499
        ("SARA"), the Hazardous Materials Transportation Act, 49 U.S.C. Section
        1801, et seq., the Resource Conservation and Recovery Act, 42 U.S.C.
        Section 6901, et seq., or other applicable state or Federal laws, rules,
        or regulations adopted pursuant to any of the foregoing. The terms
        "hazardous waste" and "hazardous substance" shall also include, without
        limitation, petroleum and petroleum by-products or any fraction thereof
        and asbestos. The representations and warranties contained herein are
        based on Grantor's due diligence in investigating the Collateral for
        hazardous wastes and substances. Grantor hereby (a) releases and waives
        any future claims against Lender for indemnity or contribution in the
        event Grantor becomes liable for cleanup of other costs under any such
        laws, and (b) agrees to indemnify and hold harmless Lender against any
        and all claims and losses resulting from a breach of this provision of
        this Agreement. This obligation to indemnify shall survive the payment
        of the indebtedness and the satisfaction of this Agreement.

        MAINTENANCE OF CASUALTY INSURANCE. Grantor shall procure and maintain
        all risks insurance, including without limitation fire, theft and
        liability coverage together with such other insurance as Lender may
        require with respect to the Collateral, in form, amounts, coverages and
        basis reasonable acceptable to Lender. GRANTOR MAY FURNISH THE REQUIRED
        INSURANCE WHETHER THROUGH EXISTING POLICIES OWNED OR CONTROLLED BY
        GRANTOR OR THROUGH EQUIVALENT INSURANCE FROM ANY INSURANCE COMPANY
        AUTHORIZED TO TRANSACT BUSINESS IN THE STATE OF TEXAS. If Grantor fails
        to provide any required insurance or fails to continue such insurance in
        force, Lender may, but shall not be required to, do so at Grantor's
        expense, and the cost of the insurance will be added to the
        indebtedness. If any such insurance is procured by Lender at a rate or
        charge not fixed or approved by the State Board of Insurance, Grantor
        will be so notified, and Grantor will have the option for five (5) days
        of furnishing equivalent insurance through any insurer authorized to
        transact business in Texas. Grantor, upon request of Lender, will
        deliver to Lender from time to time the policies or certificates of
        insurance in form satisfactory to Lender, including stipulations that
        coverages will not be cancelled or diminished without at least thirty
        (30) days' prior written notice to Lender and not including any
        disclaimer of the insurer's liability for failure to give such a notice.
        Each insurance policy also shall include an endorsement providing that
        coverage in favor of Lender will not be impaired in any way by any act,
        omission or default of Grantor or any other person. In connection with
        all policies covering assets in which Lender holds or is offered a
        security interest, Grantor will provide Lender with such loss payable or
        other endorsements as Lender may require. If Grantor at any time fails
        to obtain or maintain any insurance as required under this Agreement,
        Lender may (but shall not be obligated to) obtain such insurance as
        Lender deems appropriate, including if it so chooses "single interest
        insurance," which will cover only Lender's interest in the Collateral.

        APPLICATION OF INSURANCE PROCEEDS. Grantor shall promptly notify Lender
        of any loss or damage to the Collateral. Lender may make proof of loss
        if Grantor fails to do so within fifteen (15) days of the casualty. All
        proceeds of any insurance on the Collateral, including accrued proceeds
        thereon, shall be held by Lender as part of the Collateral. If Lender
        consents to repair or replacement of the damaged or destroyed
        Collateral, Lender shall, upon satisfactory proof of expenditure, pay or
        reimburse Grantor from the proceeds for the reasonable cost of repair or
        restoration. If Lender does not consent to repair or replacement of the
        Collateral, Lender shall retain a sufficient amount of the proceeds to
        pay all of the indebtedness, and shall pay the balance to Grantor. Any
        proceeds which have not been disbursed within six (6) months after their
        receipt and which Grantor has not committed to the repair or restoration
        of the Collateral shall be used to prepay the indebtedness.

        INSURANCE RESERVES. Lender may require Grantor to maintain with Lender
        reserves for payment of insurance premiums, which reserves shall be
        created by monthly payments from Grantor of a sum estimated by Lender to
        be sufficient to produce, at least fifteen (15) days before the premium
        due date, amounts at least equal to the insurance premiums to be paid.
        If fifteen (15) days before payment is due, the reserve funds are
        insufficient, Grantor shall upon demand pay any deficiency to Lender.
        The reserve funds shall be held by Lender as a general deposit and shall
        constitute a non-interest-bearing account which Lender may satisfy by
        payment of the insurance premiums required to be paid by Grantor as they
        become due. Lender does not hold the reserve funds in trust for Grantor,
        and Lender is not the agent of Grantor for payment of the insurance
        premiums required to be paid by Grantor. The responsibility for the
        payment of premiums shall remain Grantor's sole responsibility.

        INSURANCE REPORTS. Grantor, upon request of Lender, shall furnish to
        Lender reports on each existing policy of insurance showing such
        information as Lender may reasonably request including the following:
        (a) the name of the insurer; (b) the risks insured; (c) the amount of
        the policy; (d) the property insured; (e) the then current value on the
        basis of which insurance has been obtained and the manner of determining
        that value; and (f) the expiration date of the policy. In addition,
        Grantor shall upon request by Lender (however not more often than
        annually) have an independent appraiser satisfactory to Lender
        determine, as applicable, the cash value or replacement cost of the
        Collateral.

GRANTOR'S RIGHT TO POSSESSION.  Until default, Grantor may have possession of 
the tangible personal property and beneficial use of all the Collateral and may 
use it in any lawful manner not inconsistent with this Agreement or the Related 
Documents, provided that Grantor's right to possession and beneficial use shall 
not apply to any Collateral where possession of the Collateral by Lender is 
required by law to perfect Lender's security interest in such Collateral.  If 
Lender at any time has possession of any Collateral, whether before or after an 
Event of Default, Lender shall be deemed to have exercised reasonable care in 
the custody and preservation of the Collateral if Lender takes such action for 
that purpose as Grantor shall request or as Lender, in Lender's sole discretion,
shall deem appropriate under the circumstances, but failure to honor any request
by Grantor
<PAGE>
 
10-30-1996              COMMERCIAL SECURITY AGREEMENT                   PAGE 3
LOAN NO 605740                  (CONTINUED)
================================================================================

shall not of itself be deemed to be a failure to exercise reasonable care. 
Lender shall not be required to take any steps necessary to preserve any rights 
in the Collateral against prior parties, nor to protect, preserve or maintain 
any security interest given to secure the Indebtedness.

EXPENDITURES BY LENDER. If not discharged or paid when due, Lender may (but 
shall not be obligated to) discharge or pay any amounts required to be 
discharged or paid by Grantor under this Agreement, including without limitation
all taxes, liens, security interests, encumbrances, and other claims, at any 
time levied or placed on the Collateral. Lender also may (but shall not be 
obligated to) pay all costs for insuring, maintaining and preserving the 
Collateral. All such expenditures incurred or paid by Lender for such purposes 
will then bear interest at the Note rate from the date incurred or paid by 
Lender to the date of repayment by Grantor. All such expenses shall become a 
part of the Indebtedness and, at Lender's option, will (a) be payable on demand,
(b) be added to the balance of the Note and be apportioned among and be payable 
with any installment payments to become due during either (i) the term of any 
applicable insurance policy or (ii) the remaining term of the Note, or (c) be 
treated as a balloon payment which will be due and payable at the Note's 
maturity. This Agreement also will secure payment of these amounts. Such right 
shall be in addition to all other rights and remedies to which Lender may be 
entitled upon the occurrence of an Event of Default.

EVENTS OF DEFAULT. Each of the following shall constitute an Event of Default 
under this Agreement:

        DEFAULT ON INDEBTEDNESS. Failure of Grantor to make any payment when due
        on the Indebtedness.

        OTHER DEFAULTS. Failure of Grantor to comply with or to perform any
        other term, obligation, covenant or condition contained in this
        Agreement or in any of the Related Documents or in any other agreement
        between Lender and Grantor.

        FALSE STATEMENTS. Any warranty, representation or statement made or
        furnished to Lender by or on behalf of Grantor under this Agreement, the
        Note or the Related Documents is false or misleading in any material
        respect, either now or at the time made or furnished.

        DEFECTIVE COLLATERALIZATION. This Agreement or any of the Related
        Documents ceases to be in full force and effect (including failure of
        any collateral documents to create a valid and perfected security
        interest or lien) at any time and for any reason.

        INSOLVENCY. The dissolution or termination of Grantor's existence as a
        going business, the insolvency of Grantor, the appointment of a receiver
        for any part of Grantor's property, any assignment for the benefit of
        creditors, any type of creditor workout, or the commencement of any
        proceeding under any bankruptcy or insolvency laws by or against
        Grantor.

        CREDITOR OR FORFEITURE PROCEEDINGS. Commencement of foreclosure or
        forfeiture proceedings, whether by judicial proceeding, self-help,
        repossession or any other method, by any creditor of Grantor or by any
        governmental agency against the Collateral or any other collateral
        securing the Indebtedness. This includes a garnishment of any of
        Grantor's deposit accounts with Lender. However, this Event of Default
        shall not apply if there is a good faith dispute by Grantor as to the
        validity or reasonableness of the claim which is the basis of the
        creditor or forfeiture proceeding and if Grantor gives Lender written
        notice of the creditor or forfeiture proceeding and deposits with Lender
        monies or a surety bond for the creditor or forfeiture proceeding, in an
        amount determined by Lender, in its sole discretion, as being an
        adequate reserve or bond for the dispute.

        EVENTS AFFECTING GUARANTOR. Any of the preceding events occurs with
        respect to any Guarantor of any of the Indebtedness or such Guarantor
        dies or become incompetent. Lender, at its option, may, but shall not be
        required to, permit the Guarantor's estate to assume unconditionally the
        obligations arising under the guaranty in a manner satisfactory to
        Lender, and, in doing so, cure the Event of Default.

        ADVERSE CHANGE. A material adverse change occurs in Grantor's financial
        condition, or Lender believes the prospect of payment or performance of
        the Indebtedness is impaired.

        INSECURITY. Lender, in good faith, deems itself insecure.

        RIGHTS TO CURE. If any default, other than a Default on Indebtedness, is
        curable and if Grantor has not been given a prior notice of a breach of
        the same provision of this Agreement, it may be cured (and no Event of
        Default will have occurred) if Grantor, after Lender send written notice
        demanding cure of such default, (a) cures the default within fifteen
        (15) days; or (b), if the cure requires more than fifteen (15) days,
        immediately initiates steps which Lender deems in Lender's sole
        discretion to be sufficient to cure the default and thereafter continues
        and completes all reasonable and necessary steps sufficient to produce
        compliance as soon as reasonably practical.

RIGHTS AND REMEDIES ON DEFAULT. If an Event of Default occurs under this 
Agreement, at any time thereafter, Lender shall have all the rights of a secured
party under the Texas Uniform Commercial Code. In addition and without 
limitation, Lender may exercise any one or more of the following rights and 
remedies:

        ACCELERATE INDEBTEDNESS. Lender may declare the entire Indebtedness 
        immediately due and payable, without notice.

        ASSEMBLE COLLATERAL. Lender may require Grantor to deliver to Lender all
        or any portion of the Collateral and any and all certificates of title
        and other documents relating to the Collateral. Lender may require
        Grantor to assemble the Collateral and make it available to Lender at a
        place to be designated by Lender. Lender also shall have full power to
        enter, provided Lender does so without a breach of the peace or a
        trespass, upon the property of Grantor to take possession of and remove
        the Collateral. If the Collateral contains other goods not covered by
        this Agreement at the time of repossession, Grantor agrees Lender may
        take such other goods, provided that Lender makes reasonable efforts to
        return them to Grantor after repossession.
        
        SELL THE COLLATERAL. Lender shall have full power to sell, lease,
        transfer, or otherwise deal with the Collateral or proceeds thereof in
        its own name or that of Grantor. Lender may sell the Collateral at
        public auction or private sale. Unless the Collateral threatens to
        decline speedily in value or is of a type customarily sold on a
        recognized market, Lender will give Grantor reasonable notice of the
        time after which any private sale or any other intended disposition of
        the Collateral is to be made. The requirements of reasonable notice
        shall be met if such notice is given at least ten (10) days before the
        time of the sale or disposition. All expenses relating to the
        disposition of the Collateral, including without limitation the expenses
        of retaking, holding, insuring, preparing for sale and selling the
        Collateral, shall become a part of the Indebtedness secured by this
        Agreement and shall be payable on demand, with interest at the Note rate
        from date of expenditure until repaid.

        APPOINT RECEIVER. To the extent permitted by applicable law, Lender
        shall have the following rights and remedies regarding the appointment
        of a receiver: (a) Lender may have a receiver appointed as a matter of
        right, (b) the receiver may be an employee of Lender and may serve
        without bond, and (c) all fees of the receiver and his or her attorney
        shall become part of the Indebtedness secured by this Agreement and
        shall be payable on demand, with interest at the Note rate from date of
        expenditure until repaid.

        COLLECT REVENUES, APPLY ACCOUNTS. Lender either itself or through a
        receiver, may collect the payments, rents, income, and revenues from the
        Collateral. Lender may at any time in its discretion transfer any
        Collateral into its own name or that of its nominee and receive the
        payments, rents, income, and revenues therefrom and hold the same as
        security for the Indebtedness or apply it to payment of the Indebtedness
        in such order of preference as Lender may determine. Insofar as the
        Collateral consists of accounts, general intangibles, insurance
        policies, instruments, chattel paper, choses in action, or similar
        property, Lender may demand, collect, receipt for, settle, compromise,
        adjust, sue for, foreclose, or realize on the Collateral as Lender may
        determine, whether or not Indebtedness or Collateral is then due. For
        these purposes, Lender may, on behalf of and in the name of Grantor,
        receive, open and dispose of mail addressed to Grantor; change any
        address to which mail and payments are to be sent; and endorse notes,
        checks, drafts, money orders, documents of title, instruments and items
        pertaining to payment, shipment, or storage of any Collateral. To
        facilitate collection, Lender may notify account debtors and obligors on
        any Collateral to make payments directly to Lender.

        OBTAIN DEFICIENCY. If Lender chooses to sell any or all of the
        Collateral, Lender may obtain a judgment against Grantor for any
        deficiency remaining on the Indebtedness due to Lender after
        application of all amounts received from the exercise of the rights
        provided in this Agreement. Grantor shall be liable for a deficiency
        even if the transaction described in this subsection is a sale of
        accounts or chattel paper.

        OTHER RIGHTS AND REMEDIES. Lender shall have all the rights and remedies
        of a secured creditor under the provisions of the Uniform Commercial
        Code, as may be amended from time to time. In addition, Lender shall
        have and may exercise any or all other rights and remedies it may have
        available at law, in equity, or otherwise.

        CUMULATIVE REMEDIES. All of Lender's rights and remedies, whether
        evidenced by this Agreement or the Related Documents or by any other
        writing, shall be cumulative and may be exercised singularly or
        concurrently. Election by Lender to pursue any remedy shall not exclude
        pursuit of any other remedy, and an election to make expenditures or to
        take action to perform an obligation of Grantor under this Agreement,
        after Grantor's failure to perform, shall not affect Lender's right to
        declare a default and to exercise its remedies.

MISCELLANEOUS PROVISIONS.  The following miscellaneous provisions are a part of 
this Agreement.

        AMENDMENTS. This Agreement, together with any Related Documents,
        constitutes the entire understanding and agreement of the parties as to
        the matters set forth in this Agreement. No alteration of or amendment
        to this Agreement shall be effective unless given in writing and signed
        by the party or parties sought to be charged or bound by the alteration
        or amendment.

        APPLICABLE LAW. This Agreement has been delivered to Lender and accepted
        by Lender in the State of Texas. If there is a lawsuit, Grantor agrees
        upon Lender's request to submit to the jurisdiction of the courts of the
        State of Texas. This Agreement shall be governed by and construed in
        accordance with the laws of the State of Texas and applicable Federal
        laws.

        ATTORNEYS' FEE AND OTHER COSTS. Lender may hire an attorney to help
        collect the Note if Grantor does not pay, and Grantor will pay Lender's
        reasonable attorneys' fees. Grantor also will pay Lender all other
        amounts actually incurred by Lender as court costs, lawful fees for
        filing,


        
<PAGE>

10-30-1996               COMMERCIAL SECURITY AGREEMENT                    PAGE 4
LOAN NO 605740                    (CONTINUED)
================================================================================
 
        recording, or releasing to any public office any instrument securing the
        Note; the reasonable cost actually expended for repossessing, storing,
        preparing for sale, and selling any security; and fees for noting a lien
        on or transferring a certificate of title to any motor vehicle offered
        as security for the Note, or premiums or identifiable charges received
        in connection with the sale of authorized insurance.

        CAPTION HEADINGS. Caption headings in this Agreement are for convenience
        purposes only and are not to be used to interpret or define the
        provisions of this Agreement.

        MULTIPLE PARTIES; CORPORATE AUTHORITY. All obligations of Grantor under
        this Agreement shall be joint and several, and all references to Grantor
        shall mean each and every Grantor. This means that each of the Borrowers
        signing below is responsible for all obligations in this Agreement.

        NOTICES. All notices required to be given under this Agreement shall be
        given in writing, may be sent by telefacsimile, and shall be effective
        when actually delivered or when deposited with a nationally recognized
        overnight courier or deposited in the United States mail, first class,
        postage prepaid, addressed to the party to whom the notice is to be
        given at the address shown above. Any party may change its address for
        notices under this Agreement by giving formal written notice to the
        other parties, specifying that the purpose of the notice is to change
        the party's address. To the extent permitted by applicable law, if there
        is more than one Grantor, notice to any Grantor will constitute notice
        to all Grantors. For notice purposes, Grantor will keep Lender informed
        at all times of Grantor's current address(es).

        POWER OF ATTORNEY. Grantor hereby appoints Lender as its true and lawful
        attorney-in-fact, irrevocably, with full power of substitution to do the
        following: (a) to demand, collect, receive, receipt for, sue and
        recover all sums of money or other property which may now or hereafter
        become due, owing or payable from the Collateral; (b) to execute, sign
        and endorse any and all claims, instruments, receipts, checks, drafts or
        warrants issued in payment for the Collateral; (c) to settle or
        compromise any and all claims arising under the Collateral, and, in the
        place and stead of Grantor, to execute and deliver its release and
        settlement for the claim; and (d) to file any claim or claims or to take
        any action or institute or take part in any proceedings, either in its
        own name or in the name of Grantor, or otherwise, which in the
        discretion of Lender may seem to be necessary or advisable. This power
        is given as security for the Indebtedness, and the authority hereby
        conferred is and shall be irrevocable and shall remain in full force and
        effect until renounced by Lender.

        SEVERABILITY. If a court of competent jurisdiction finds any provision
        of this Agreement to be invalid or unenforceable as to any person or
        circumstance, such finding shall not render that provision invalid or
        unenforceable as to any other persons or circumstances. If feasible, any
        such offending provision shall be deemed to be modified to be within the
        limits of enforceability or validity; however, if the offending
        provision cannot be so modified, it shall be stricken and all other
        provisions of this Agreement in all other respects shall remain valid
        and enforceable.

        SUCCESSOR INTERESTS. Subject to the limitations set forth above on
        transfer of the Collateral, this Agreement shall be binding upon and
        inure to the benefit of the parties, their successors and assigns.

        WAIVER. Lender shall not be deemed to have waived any rights under this
        Agreement unless such waiver is given in writing and signed by Lender.
        No delay or omission on the part of Lender in exercising any right shall
        operate as a waiver of such right or any other right. A waiver by Lender
        of a provision of this Agreement shall not prejudice or constitute a
        waiver of Lender's right otherwise to demand strict compliance with that
        provision or any other provision of this Agreement. No prior waiver by
        Lender, nor any course of dealing between Lender and Grantor, shall
        constitute a waiver of any of Lender's rights or of any of Grantor's
        obligations as to any future transactions. Whenever the consent of
        Lender is required under this Agreement, the granting of such consent by
        Lender in any instance shall not constitute continuing consent to
        subsequent instances where such consent is required and in all cases
        such consent may be granted or withheld in the sole discretion of
        Lender.

GRANTOR ACKNOWLEDGES HAVING READ ALL THE PROVISIONS OF THIS COMMERCIAL SECURITY
AGREEMENT, AND GRANTOR AGREES TO ITS TERMS. THIS AGREEMENT IS DATED
OCTOBER 30, 1996.

GRANTOR:

DIAMOND TECH ONE, INC.


BY:--------------------------------------
   DOUGLAS P. BAKER, VICE PRESIDENT & CFO


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