Document:

<PAGE>
                                                                   Exhibit 10.36

                            SECURED PROMISSORY NOTE

$500,000                                                   San Diego, California
                                                                 August 31, 2002

     FOR VALUE RECEIVED, the undersigned, Danam Acquisition Corp., a Delaware
corporation ("Maker"), having its principal place of business located at 178
Christian Street, Oxford, CT 06478, hereby promises to pay to Synbiotics
Corporation, a California corporation ("Holder"), having its principal place of
business located at 11011 Via Frontera, San Diego, California 92127, the sum of
Five Hundred Thousand Dollars ($500,000), as hereinafter provided.

     This Secured Promissory Note is issued pursuant to that certain Asset
Purchase Agreement (the "Purchase Agreement"), of even date herewith, among
Maker, Holder and Drew Scientific Group PLC and is subject to all rights of
offset as set forth in Section 6.2 of the Purchase Agreement.

     The outstanding principal amount of this Secured Promissory Note (this
"Secured Promissory Note") shall be payable in sixty (60) equal monthly
installments of Eight Thousand Three Hundred Thirty-Three Dollars and
Thirty-Three Cents ($8,333.33), payable on the last day of each calendar month
commencing on September 30, 2002 and ending on August 31, 2007, at which later
time the entire principal amount of this Secured Promissory Note then
outstanding together with any outstanding accrued and unpaid interest thereon
shall be due and payable.

     Maker hereby also promises to pay interest on the unpaid principal amount
hereof in like money, payable monthly commencing on September 1, 2002 and ending
with the final payment of principal due hereunder from the date hereof until
payment of the principal amount hereof has been made in full, at a fixed rate of
five percent (5%) per annum as set forth on Schedule A attached hereto. Interest
shall be computed on the basis of a year of 365 or 366 days, as the case may be,
and actual days elapsed.

     Principal of this Secured Promissory Note and accrued but unpaid interest
thereon is payable in lawful money of the United States of America, in cash, by
bank or certified check or by wire transfer of immediately available funds to
the Holder at the address set forth below or, in the case of a wire transfer, to
the account designated by Holder set forth below.

For Checks:

  Comerica Bank - California
  9920 La Cinega Blvd., Suite 623
  Inglewood, California 90301
  Attention: Thomas G. Kinzel, Vice President

<PAGE>
For Wire Transfers:

    Comerica Bank - California
    Wire Transfer Corporate Service Center
    2015 Manhattan Beach Blvd.
    Redondo Beach, California 90278-1205
    ABA No. #122201444
    Account No. #2505100529
    Attention: Tom Kinzel; X5760
    Reference: Synbiotics Corporation Loan #00708054423; Note #6

          This Secured Promissory Note shall be secured by such of Maker's
assets as described in the Security Agreement of even date herewith between
Maker and Holder (the "Security Agreement"), and filings reflecting such
security interests shall be filed with the appropriate authorities according to
the Security Agreement.

          Drew Scientific Group PLC, a company organized under the laws of
England and Wales ("Guarantor"), which indirectly owns one hundred percent
(100%) of the issued and outstanding capital stock of Maker, has guaranteed
payment of this Secured Promissory Note pursuant to that certain Guaranty of
even date herewith executed by Guarantor (the "Guaranty").

          If any payment required hereunder shall become due on a Saturday,
Sunday or legal holiday under the laws of the State of California, the State of
Massachusetts or the United Kingdom or any other day on which banking
institutions in the City of San Diego, the City of Boston or the City of London
are obligated or authorized by law or executive order to close, such payment
shall be made on the next succeeding business day.

          If (i) Maker fails to make complete payment of any payment due
hereunder on any date on which such payment is due, (ii) an order of relief
under any bankruptcy, reorganization or insolvency laws has been entered against
Maker by a court having jurisdiction, or (iii) Maker admits in writing its
inability to pay its debts generally as they become due, files a petition for
relief under any bankruptcy, reorganization or insolvency laws, consents to the
filing of a bankruptcy proceeding against it or the appointment of a receiver
for itself or for all or substantially all of its property, a petition in
bankruptcy is filed against it or it makes an assignment for the benefit of its
creditors, then, in any such event, Holder, at its option, may exercise any of
its rights and remedies set forth in the Security Agreement and may accelerate
this Secured Promissory Note and without notice to Maker declare the entire
unpaid principal amount of this Secured Promissory Note to be immediately due
and payable, whereupon the entire principal amount shall become and be forthwith
due and payable, without presentment, due diligence, demand, protest or notice
of any kind.

          This Secured Promissory Note may be prepaid in whole or in part,
without premium or penalty, at any time, but with interest accrued to the date
of prepayment. Any prepayment of this Secured Promissory Note in part shall be
applied to the installments of principal payable hereunder in the order of
maturity thereof.

<PAGE>
          No delay or omission of Holder in exercising any right or remedy
hereunder shall constitute a waiver of any such right or remedy. Acceptance by
Holder of any payment after demand therefor shall not be deemed a waiver of such
demand. A waiver on one occasion shall not operate as a bar to or waiver of any
such right or remedy on any future occasion.

      Maker, regardless of the time, order or place signing, waives presentment
for payment, demand, notice of nonpayment, notice of dishonor, protest of any
dishonor, notice of protest and protest of this Secured Promissory Note, and
Maker agrees that its liability hereunder shall not be in any manner affected by
any indulgences, extension of time, renewal, waiver or modification granted by
Holder; and Maker consents to every extension of time, renewal, waiver or
modification that may be granted by Holder with respect to the payment or other
provisions of this Secured Promissory Note.

          Maker agrees to pay all reasonable expenses of the Holder of this
Secured Promissory Note in connection with the collection and enforcement of
this Secured Promissory Note, including court costs and reasonable attorneys'
fees and disbursements.

          This instrument shall be governed by and construed in accordance with
the internal laws of the State of New York, without regard to its conflicts of
laws principles. Maker hereby agrees that all actions or proceedings arising in
connection with this Secured Promissory Note shall be initiated and tried
exclusively in the courts located in the County of San Diego, State of
California. The aforementioned choice of venue is intended to be mandatory and
not permissive in nature, thereby precluding the possibility of litigation
between Maker and Holder with respect to or arising out of this Secured
Promissory Note in any jurisdiction other than that specified in this paragraph.
Maker waives any right it may have to assert the doctrine of forum non
conveniens or similar doctrine or to object to venue with respect to any
proceeding brought in accordance with this paragraph, and stipulates that the
courts located in the County of San Diego, State of California, shall have in
personam jurisdiction and venue over Maker for the purposes of litigating any
dispute, controversy or proceeding arising out of or related to this Secured
Promissory Note. Maker hereby authorizes and accepts service of process
sufficient for personal jurisdiction in any action against it as contemplated by
this paragraph by registered or certified mail, return receipt requested,
postage prepaid, to its address for the giving of notices as set forth in the
first paragraph of this Secured Promissory Note. Any final judgment rendered
against Maker in any action or proceeding shall be conclusive as to the subject
of such final judgment and may be enforced in other jurisdictions in any manner
provided by law.

          None of the obligations of Maker under this Secured Promissory Note,
including, without limitation, Maker's obligation to pay the indebtedness
evidenced hereby nor any part thereof, may be assigned (whether by operation of
law or otherwise) by Maker without the express prior written consent of Holder,
and consent to any proposed assignment shall not constitute consent to any
subsequent proposed assignment. Any attempted assignment in contravention hereof
shall be null and void and of no force or effect.

          Holder shall have the right to freely assign this Secured Promissory
Note and the right to receive the principal amount hereof and any and all
accrued and unpaid interest thereon upon written notice to Maker and without
seeking or obtaining any consent or approval of

<PAGE>
Maker; provided, however, that any such assignment shall be of this Secured
Promissory Note in its entirety.

     The obligations and rights contained herein shall be binding on and inure
to the benefit of any permitted assigns, successors, heirs, representatives,
agents and other successors in interest.

     Executed as an instrument under the laws of the State of New York as of
the date first above written.

                              DANAM ACQUISITION CORP.

                              By: ___________________________
                              Name:
                              Title:
<PAGE>
                                   SCHEDULE A

                                 See attached.
<PAGE>
                                                               08/16/2002 Page 1
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Drew Loan
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Compound Period......................: Monthly

Nominal Annual Rate..................: 5.000  %
Effective Annual Rate................: 5.116  %
Periodic Rate........................: 0.4167 %
Daily Rate...........................: 0.01370%

CASH FLOW DATA

<TABLE>
<CAPTION>
--------------------------------------------------------------------------------
  Event       Start Date          Amount         Number Period       End Date
--------------------------------------------------------------------------------
<S>          <C>                <C>              <C>                 <C>
1 Loan       08/31/2000         500,000.00               1
2 Payment    09/30/2002           8,333.33        60 Monthly         08/31/2007
</TABLE>

     Fixed Payment (+ Interest)

AMORTIZATION SCHEDULE -- Normal Amortization

<TABLE>
<CAPTION>
     Date           Payment        Interest       Principal           Balance
--------------------------------------------------------------------------------
<S>               <C>              <C>             <C>                <C>
Loan 08/31/2002                                                       500,000.00

 1   09/30/2002    10,416.66        2,083.33        8,333.33          491,666.67
 2   10/31/2002    10,381.94        2,048.61        8,333.33          483,333.34
 3   11/30/2002    10,347.22        2,013.89        8,333.33          475,000.01
 4   12/31/2002    10,312.50        1,979.17        8,333.33          466,666.68
2002 Totals        41,458.32        8,125.00       33,333.32

 5   01/31/2003    10,277.77        1,944.44        8,333.33          458,333.35
 6   02/28/2003    10,243.05        1,909.72        8,333.33          450,000.02
 7   03/31/2003    10,208.33        1,875.00        8,333.33          441,666,69
 8   04/30/2003    10,173.61        1,840.28        8,333.33          433,333.35
 9   05/31/2003    10,138.89        1,805.56        8,333.33          425,000.03
10   06/30/2003    10,104.16        1,770.83        8,333.33          416,666.70
11   07/31/2003    10,069.44        1,736.11        8,333.33          408,333.37
12   08/31/2003    10,034.72        1,701.39        8,333.33          400,000.04
13   09/30/2003    10,000.00        1,666.67        8,333.33          391,666.71
14   10/31/2003     9,965.27        1,631.94        8,333.33          383,333.38
15   11/30/2003     9,930.55        1,597.22        8,333.33          375,000.05
16   12/31/2003     9,895.83        1,562.50        8,333.33          366,666.72
2003 Totals       121,041.62       21,041.66       99,999.96

17   01/31/2004     9,861.11        1,527.78        8,333.33          358,333.39
18   02/29/2004     9,826.39        1,493.06        8,333.33          350,000.06
19   03/31/2004     9,791.66        1,458.33        8,333.33          341,666.73
20   04/30/2004     9,756.94        1,423.61        8,333.33          333,333.40
21   05/31/2004     9,722.22        1,388.89        8,333.33          325,000.07
22   06/30/2004     9,687.50        1,354.17        8,333.33          316,666.74
23   07/31/2004     9,652.77        1,319.44        8,333.33          308,333.41
24   08/31/2004     9,618.05        1,284.72        8,333.33          300,000.08
25   09/30/2004     9,583.33        1,250.00        8,333.33          291,666.75
26   10/31/2004     9,548.61        1,215.28        8,333.33          283,333.42

</TABLE>
<PAGE>
                                                               08/16/2002 Page 2
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Drew Loan
--------------------------------------------------------------------------------
<Table>
      Date           Payment        Interest     Principal      Balance
---------------    -----------    ----------    ----------     ----------
<S>                <C>           <C>           <C>            <C>
  27 11/30/2004       9,513.89      1,180.56      8,333.33     275,000.09
  28 12/31/2004       9,479.16      1,145.83      8,333.33     266,666.76
2004 Totals         116,041.63     16,041.67     99,999.96

  29 01/31/2005       9,444.44      1,111.11      8,333.33     258,333.43
  30 02/28/2005       9,409.72      1,076.39      8,333.33     250,000.10
  31 03/31/2005       9,375.00      1,041.67      8,333.33     241,666.77
  32 04/30/2005       9,340.27      1,006.94      8,333.33     233,333.44
  33 05/31/2005       9,305.55        972.22      8,333.33     225,000.11
  34 06/30/2005       9,270.83        937.50      8,333.33     216,666.78
  35 07/31/2005       9,236.11        902.78      8,333.33     208,333.45
  36 08/31/2005       9,201.39        868.06      8,333.33     200,000.12
  37 09/30/2005       9,166.66        833.33      8,333.33     191,666.79
  38 10/31/2005       9,131.94        798.61      8,333.33     183,333.46
  39 11/30/2005       9,097.22        763.89      8,333.33     175,000.13
  40 12/31/2005       9,062.50        729.17      8,333.33     166,666.80
2005 Totals         111,041.63     11,041.67     99,999.96

  41 01/31/2006       9,027.78        694.45      8,333.33     158,333.47
  42 02/28/2006       8,993.05        659.72      8,333.33     150,000.14
  43 03/31/2006       8,958.33        625.00      8,333.33     141,666.81
  44 04/30/2006       8,923.61        590.28      8,333.33     133,333.48
  45 05/31/2006       8,888.89        555.56      8,333.33     125,000.15
  46 06/30/2006       8,854.16        520.83      8,333.33     116,666.82
  47 07/31/2006       8,819.44        486.11      8,333.33     108,333.49
  48 08/31/2006       8,784.72        451.39      8,333.33     100,000.16
  49 09/30/2006       8,750.00        416.67      8,333.33      91,666.83
  50 10/31/2006       8,715.28        381.95      8,333.33      83,333.50
  51 11/30/2006       8,680.55        347.22      8,333.33      75,000.17
  52 12/31/2006       8,645.83        312.50      8,333.33      66,666.84
2006 Totals         106,041.64      6,041.68     99,999.96

  53 01/31/2007       8,611.11        277.78      8,333.33      58,333.51
  54 02/28/2007       8,576.39        243.06      8,333.33      50,000.18
  55 03/31/2007       8,541.66        208.33      8,333.33      41,666.85
  56 04/30/2007       8,506.94        173.61      8,333.33      33,333.52
  57 05/31/2007       8,472.22        138.89      8,333.33      25,000.19
  58 06/30/2007       8,437.50        104.17      8,333.33      16,666.86
  59 07/31/2007       8,402.78         69.45      8,333.33       8,333.53
  60 08/31/2007       8,368.05         34.52      8,333.53           0.00
2007 Totals          67,916.65      1,249.81     66,666.84

Grand Totals        563,541.49     63,541.49    500,000.00
</Table>

<PAGE>
                                                               08/16/2002 Page 3

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Drew Loan
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Last interest amount decreased by 0.20 due to rounding.<PAGE>
                                                                   Exhibit 10.37

             SIXTH AMENDMENT TO AMENDED AND RESTATED LOAN AGREEMENT
                     (EX-IM BANK-GUARANTEED LINE OF CREDIT)

      This is the Sixth Amendment to Amended and Restated Loan Agreement (Ex-Im
Bank-Guaranteed Line of Credit) effective as of November 30, 2003 (this
"AMENDMENT") and entered into between DREW SCIENTIFIC, INC. a Texas corporation
d/b/a Danam Electronics and f/k/a MWI, Inc. (the "BORROWER") and BANK OF
AMERICA, N.A. (the "BANK").

                                   BACKGROUND

      A. The Borrower and the Bank entered into a certain Revolving Loan
Agreement (Ex-Im Bank-Guaranteed Line of Credit) dated as of June 1, 2000, as
amended by the certain First Amendment to Loan Agreement (Ex-Im Bank-Guaranteed
Line of Credit) dated as of April 3, 2001, as amended by the certain Second
Amendment to Loan Agreement (Ex-Im Bank-Guaranteed Line of Credit) dated as of
June 30, 2001, as amended and restated effective on September 30, 2001 by the
certain Amended and Restated Loan Agreement (Ex-Im Bank-Guaranteed Line of
Credit), as further amended by the certain First Amendment to Amended and
Restated Loan Agreement (Ex-Im Bank-Guaranteed Line of Credit) dated as of
January 7, 2002, as further amended by the certain Second Amendment to Amended
and Restated Loan Agreement (Ex-Im Bank-Guaranteed Line of Credit) dated as of
July 8, 2002, as further amended by that certain Third Amendment to Amended and
Restated Loan Agreement (Ex-Im Bank-Guaranteed Line of Credit) dated as of
September 5, 2002 but effective August 30, 2002, as further amended by the
certain Fourth Amendment to Amended and Restated Loan Agreement (Ex-Im
Bank-Guaranteed Line of Credit) dated as of October 2, 2002 but effective as of
September 30, 2002, and as further amended by that certain Fifth Amendment to
Amended and Restated Loan Agreement (Ex-Im Bank-Guaranteed Line of Credit)
effective as of September 30, 2003 (collectively, the "ORIGINAL LOAN
AGREEMENT"). The Original Loan Agreement as amended by this Amendment shall be
referred to herein as the "LOAN AGREEMENT."

      B. The Borrower has executed in favor of the Bank a certain Seventh
Amended and Restated Revolving Promissory Note in the principal amount of
$2,000,000.00 effective on September 30, 2003 (the "NOTE").

      C. The Borrower was formerly known as "MWI, Inc." and has changed its name
to Drew Scientific, Inc., pursuant to Articles of Amendment adopted effective
October 1, 2002.

      D. The Borrower has requested that the Bank extend the maturity date of
the Note and make certain other changes, and the Bank has agreed to do so upon
the terms and conditions set forth herein.

                                    AGREEMENT

      Now, therefore, in consideration of the premises and the mutual agreements
contained herein, the parties agree to amend the Loan Agreement on the following
terms and conditions:

      SECTION 1. DEFINITIONS. All terms used herein as defined terms that are
not defined herein shall have the meanings ascribed to them in the Loan
Agreement, unless the context specifically requires otherwise.

      SECTION 2. AMENDMENTS TO ORIGINAL LOAN AGREEMENT. The following amendments
are hereby made to the Original Loan Agreement:

                                       1
<PAGE>

      (A) The definition of the "Availability Period" in Section 1.1 of the
Original Loan Agreement is hereby amended and restated in its entirety to read
as follows:

          "AVAILABILITY PERIOD means the period commencing on the date of this
Agreement and ending on May 31, 2004."

      (B) The definition of the "Note" in Section 1.1 of the Original Loan
Agreement is hereby and amended and restated in its entirety to read as follows:

          "NOTE means the Eighth Amended and Restated Revolving Promissory Note
effective on November 30, 2003 by the Borrower in favor of the Bank in the
amount of $2,000,000.00 evidencing the line of credit established hereby."

      (C) Subsection (c) of Section 2.2 of the Original Loan Agreement is hereby
amended and restated in its entirety to read as follows:

          "(c) Advances under the line of credit will bear interest at a rate
      per annum equal to the Prime Rate plus 400 basis points."

      (D) Section 6.11 of the Original Loan Agreement is hereby amended and
restated in its entirety to read as follows:

           "6.11 Collection of Export-Related Accounts Receivable: Payments.

                  (a) Until the Bank notifies the Borrower to the contrary, the
            Borrower shall make collection of all Export-Related Accounts
            Receivable and other Collateral for the Bank, shall receive all
            payments as the Bank's trustee, and shall immediately deliver all
            payments in their original form duly endorsed in blank into a
            Payment Account established for the account of the Borrower at a
            clearing bank acceptable to the Bank, subject to a Cash Collateral
            Account Agreement. On or prior to the date hereof, the Borrower
            shall establish a lock-box service for collections of Export-Related
            Accounts Receivable at a Clearing Bank acceptable to the Bank and
            subject to a Blocked Account Agreement and other documentation
            acceptable to the Bank. The Borrower shall instruct all
            Export-Related Accounts Receivable account debtors to make all
            payments directly to the address established for such service. If,
            notwithstanding such instructions, the Borrower receives any
            proceeds of Export-Related Accounts Receivable, it shall receive
            such payments as the Bank's trustee, and shall immediately deliver
            such payments to the Bank in their original form duly endorsed in
            blank or deposit them into a Payment Account, as the Bank may
            direct. All collections received in any lock-box or Payment Account
            or directly by the Borrower or the Bank, and all funds in any
            Payment Account or other account to which such collections are
            deposited shall be subject to the Bank's sole control and
            withdrawals by the Borrower shall not be permitted. The Bank or the
            Bank's designee may, at any time after the occurrence of an Event of
            Default, notify Export-Related Accounts Receivable account debtors
            that the Export-Related Accounts Receivable have been assigned to
            the Bank and of the Bank's security interest therein, and may
            collect them directly and charge the collection costs and expenses
            to the revolving line of credit established by this Agreement and
            the Note. So long as an Event of Default has occurred and is
            continuing, the Borrower, at the Bank's request, shall execute and
            deliver to the Bank such documents as the Bank shall require to
            grant the Bank access to any post office box in which collections of
            Export-Related Accounts Receivable are received.

                                       2
<PAGE>

                  (b) If sales of Export-Related Inventory are made or services
            are rendered for cash, the Borrower shall immediately deliver to the
            Bank or deposit into a Payment Account the cash which the Borrower
            receives.

                  (c) All payments including immediately available funds
            received by the Bank at a bank account designated by it, will be the
            Bank's sole property for its benefit.

                  (d) In the event the Borrower repays all of the Borrower's
            obligations to the Bank upon the termination of this Agreement or
            upon acceleration of such obligations, other than through the Bank's
            receipt of payments on account of the Export-Related Accounts
            Receivable or proceeds of the other Collateral, such payment will be
            credited (conditioned upon final collection) to the Borrower's Loan
            Account upon the Bank's receipt of immediately available funds.

                  (e) For purposes of this Section 6.11, the term "Payment
            Account" means account number 4774606503 established by the Borrower
            with the Bank.

      SECTION 3. CONDITIONS PRECEDENT. This Amendment shall become effective
upon (a) the execution and delivery of (i) this Amendment by the Borrower and
the Bank; (ii) the Note by the Borrower, (iii) the ratification of guaranty by
Drew Scientific Group, PLC, (iv) the ratification of guaranty by CDC Acquisition
Corp., and (v) the Second Amendment to Intercreditor Agreement by Vertex
Financial Corporation, The Texas Mezzanine Fund, Inc., Borrower and Bank; (b)
payment of (i) Ex-Im Bank guarantee fee of $20,000.00, and (iii) the reasonable
fees and costs of Bank's counsel; and (c) all proceedings required to be taken
by the Borrower in connection the transactions contemplated by this Amendment
having been taken in form and substance satisfactory to the Bank and its
counsel, and the Bank having received all such counterpart originals of this
Amendment executed by all parties listed on the signature page(s) and originals,
certified or other copies of such other documents as the Bank may reasonably
request.

      SECTION 4. REAFFIRMATION. Except as modified hereby, all of terms,
covenants and conditions of the Loan Agreement are ratified, reaffirmed and
confirmed and shall continue in full force and effect as therein written. In
addition, all representations and warranties made in the Loan Agreement are true
and correct in all material respects as of the date hereof and are hereby
reaffirmed. Nothing hereunder is intended, or shall be construed, to be a
novation or an accord and satisfaction of any other obligation or liability of
the Borrower to the Bank.

      SECTION 5. REPRESENTATIONS AND WARRANTIES: NO DEFAULT. The Borrower
represents and warrants to, and agrees with the Bank, that this Amendment has
been duly authorized by all necessary corporate action on the part of the
Borrower, has been duly executed by a duly authorized officer of the Borrower
and constitutes the valid and binding obligation of the Borrower, enforceable
against the Borrower in accordance with the terms hereof. The Borrower hereby
certifies that the representations and warranties contained in the Original Loan
Agreement continue to be true and correct and that after giving effect to this
Amendment no Event of Default and no event has occurred that with notice, lapse
of time, or both would become an Event of Default.

      SECTION 6. BINDING EFFECT. This Amendment shall be binding upon the
Borrower and the Bank and their respective successors and assigns, and shall
inure to the benefit of the Borrower and the Bank and their respective
successors and assigns.

                                       3
<PAGE>

      SECTION 7. COUNTERPARTS. This Amendment may be executed in any number of
counterparts and by the different parties on separate counterparts. Each such
counterpart shall be deemed to be an original, but all such counterparts shall
together constitute one and the same agreement.

      SECTION 8. AMENDMENT AND WAIVER. No amendment of this Amendment, and no
waiver of any one or more of the provisions hereof shall be effective unless set
forth in a writing and signed by the parties hereto.

      SECTION 9. GOVERNING LAW. This Amendment shall be governed by and
construed in accordance with the internal laws of the State of Texas without
reference to conflict of law principles.

      SECTION 10. SEVERABILITY. Any provision of this Amendment this is held to
be inoperative, unenforceable, voidable or invalid in any jurisdiction shall, as
to that jurisdiction, be ineffective, unenforceable, void or invalid without
affecting the remaining provisions in that or any other jurisdiction, and to
this end, the provisions of this Amendment are declared to be severable.

      IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed and delivered by their proper and duly authorized officers as of
the date first above written.

BORROWER:                                          BANK:

DREW SCIENTIFIC, INC./d/b/a DANAM                  BANK OF AMERICA, N.A.
ELECTRONICS

By: /s/ Keith Raymond Drew                         By: /s/ John Clarke
    ------------------------------------               -----------------------
    Keith Raymond Drew                             John Clarke
    President and Chief Executive Officer          Title: VP

and

By: /s/ James B. Acock
    ----------------------------------
    James B. Acock
    Treasurer, Secretary and Chief Financial
    Officer

                                       4

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