EXHIBIT 10.29
                                                                  -------------

                            REVOLVING PROMISSORY NOTE
                              (Export-Import Bank)


$500,000.00                                                    December 19, 2001

           FOR VALUE RECEIVED, the undersigned (the "Borrower"), promises to pay
to the order of Silicon Valley Bank ("Bank"), at such place as the holder hereof
may designate, in lawful money of the United States of America, the aggregate
unpaid principal amount of all advances ("Advances") made by Bank to Borrower,
up to a maximum principal amount of Five Hundred Thousand Dollars ($500,000.00),
plus interest on the aggregate unpaid principal amount of such Advances, at the
rates and in accordance with the terms of the Export-Import Bank Loan and
Security Agreement between Borrower and Bank of even date herewith, as amended
from time to time (the "Loan Agreement") on the first calendar day of each month
after an Advance has been made. The entire principal amount and all accrued
interest shall be due and payable on October 1, 2002, or on such earlier date,
as provided for in the Loan Agreement.

           Borrower irrevocably waives the right to direct the application of
any and all payments at any time hereafter received by Bank from or on behalf of
Borrower, and Borrower irrevocably agrees that Bank shall have the continuing
exclusive right to apply any and all such payments against the then due and
owing obligations of Borrower as Bank may deem advisable. In the absence of a
specific determination by Bank with respect thereto, all payments shall be
applied in the following order: (a) then due and payable fees and expenses; (b)
then due and payable interest payments and mandatory prepayments; and (c) then
due and payable principal payments and optional prepayments.

           Bank is hereby authorized by Borrower to endorse on Bank's books and
records each Advance made by Bank under this Note and the amount of each payment
or prepayment of principal of each such Advance received by Bank; it being
understood, however, that failure to make any such endorsement (or any errors in
notation) shall not affect the obligations of Borrower with respect to Advances
made hereunder, and payments of principal by Borrower shall be credited to
Borrower notwithstanding the failure to make a notation (or any errors in
notation) thereof on such books and records.

           Borrower promises to pay Bank all reasonable costs and reasonable
expenses including all reasonable attorneys' fees, incurred in such collection
or in any suit or action to collect this Note or in any appeal thereof, unless a
final court of competent jurisdiction finds that the Bank acted with gross
negligence or willful misconduct. Borrower waives presentment, demand, protest,
notice of protest, notice of dishonor, notice of nonpayment, and any and all
other notices and demands in connection with the delivery, acceptance,
performance, default or enforcement of this Note, as well as any applicable
statute of limitations. No delay by Bank in exercising any power or right
hereunder shall operate as a waiver of any power or right. Time is of the
essence as to all obligations hereunder.

           This Note is issued pursuant to the Loan Agreement, which shall
govern the rights and obligations of Borrower with respect to all obligations
hereunder.

           The law of the Commonwealth of Massachusetts shall apply to this
Agreement. BORROWER ACCEPTS FOR ITSELF AND IN CONNECTION WITH ITS PROPERTIES,
UNCONDITIONALLY, THE NON-EXCLUSIVE JURISDICTION OF ANY STATE OR FEDERAL COURT OF
COMPETENT JURISDICTION IN THE COMMONWEALTH OF MASSACHUSETTS IN ANY ACTION, SUIT,
OR PROCEEDING OF ANY KIND, AGAINST IT WHICH ARISES OUT OF OR BY REASON OF THIS
NOTE OR THE LOAN AGREEMENT; PROVIDED, HOWEVER, THAT IF FOR ANY REASON BANK
CANNOT AVAIL ITSELF OF THE COURTS OF THE COMMONWEALTH OF MASSACHUSETTS, BORROWER
ACCEPTS JURISDICTION OF THE COURTS AND VENUE IN SANTA CLARA COUNTY, CALIFORNIA.

           BORROWER WAIVES ITS RIGHT TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF
ACTION BASED UPON OR ARISING OUT OF ANY OF THE EXIM LOAN DOCUMENTS OR ANY OF THE
TRANSACTIONS CONTEMPLATED THEREIN, INCLUDING CONTRACT CLAIMS, TORT CLAIMS,

<PAGE>

BREACH OF DUTY CLAIMS, AND ALL OTHER COMMON LAW OR STATUTORY CLAIMS. BORROWER
RECOGNIZES AND AGREES THAT THE FOREGOING WAIVER CONSTITUTES A MATERIAL
INDUCEMENT FOR IT TO ENTER INTO THIS AGREEMENT. BORROWER REPRESENTS AND WARRANTS
THAT IT HAS REVIEWED THIS WAIVER WITH ITS LEGAL COUNSEL AND THAT IT KNOWINGLY
AND VOLUNTARILY WAIVES ITS JURY TRIAL RIGHTS FOLLOWING CONSULTATION WITH LEGAL
COUNSEL.


DATAWATCH CORPORATION

By: /s/ Robert W. Hagger
    ------------------------------

Name: Robert W. Hagger
      ----------------------------

Title: President & Chief Executive Officer
       -----------------------------------


DATAWATCH INTERNATIONAL LIMITED

By: /s/ Robert W. Hagger
    ------------------------------

Name: Robert W. Hagger
      ----------------------------

Title: Director
       ---------------------------



DATAWATCH EUROPE LIMITED

By: /s/ Alan R. MacDougall
    ------------------------------

Name: Alan R. MacDougall
      ----------------------------

Title: Director & Secretary
       ---------------------------