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                                                                   EXHIBIT 10.43


                               FIRST AMENDMENT TO
                           SECURITY AND LOAN AGREEMENT
                              AND ADDENDUM THERETO

               This First Amendment ("Amendment") amends that certain Security
and Loan Agreement ("Security and Loan Agreement") and the attached Addendum,
("Addendum" and together with the Security and Loan Agreement the "Agreement")
both dated June 9, 1998 between Imperial Bank ("Bank") and Alpha Microsystems
("Borrower") as follows:

1.      The following Section 2.e is hereby added to the Addendum:

        "e. Borrower and its subsidiaries have reviewed the areas within their
        operations and business which could be adversely affected by, and have
        developed or are developing a program to address on a timely basis, the
        Year 2000 Problem and have made related appropriate inquiry of material
        suppliers and vendors, and based on such review and program, the Year
        2000 Problem will not have a Material Adverse Effect upon its financial
        condition, operations or business as now conducted. . "Year 2000
        Problem" means the possibility that any computer applications or
        equipment used by Borrower may be unable to recognize and properly
        perform date-sensitive functions involving certain dates prior to and
        any dates on or after December 31, 1999."

2.      Section 7.a of the Addendum is hereby amended to read in full as
follows:

        "a. On a quarterly basis, maintain a minimum EFFECTIVE TANGIBLE NET
        WORTH (defined as stockholder's equity, plus subordinated debt, if any,
        less any intangible assets) of not less than $6,750,000 through 3/31/99,
        $6,000,000 at 6/30/99, $5,500,000 at 9/30/99 and $5,400,000 at 12/31/99,
        plus 70% of positive net income after taxes, if any, for each period."

3.      7.b of the Addendum is hereby amended to read in full as follows:

        "b. On a quarterly basis, maintain a maximum TOTAL DEBT TO EFFECTIVE
        TANGIBLE NET WORTH (defined as total liabilities excluding deferred
        revenues to effective tangible net worth) of not more than 1.50 to
        1.00."

4.      Section 7.c of the Addendum is hereby amended to read in full as
follows:




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        "c. On a quarterly basis, maintain a minimum QUICK RATIO (defined as
        cash and equivalents and accounts receivable to current liabilities less
        deferred revenues) of at least 1.50 to 1.00."

5.      The following is hereby added as Section 7q. to the Addendum:

        "q. YEAR 2000 COMPLIANCE. Borrower shall perform all acts reasonably
        necessary to ensure that (a) Borrower and any business in which Borrower
        holds a substantial interest, and (b) all customers, suppliers and
        vendors that are material to Borrower's business, become Year 2000
        Compliant in a timely manner. Such acts shall include, without
        limitation, performing a comprehensive review and assessment of all
        Borrower's systems and adopting a detailed plan, with itemized budget,
        for the remediation, monitoring and testing of such systems. As used in
        this paragraph, "Year 2000 Compliant" shall mean, in regard to any
        entity, that all software, hardware, firmware, equipment, goods or
        systems utilized by or material to the business operations or financial
        condition of such entity, will properly perform date sensitive functions
        before, during and after the year 2000. Borrower shall, immediately upon
        request, provide to Bank such certifications or other evidence of
        Borrower's compliance with the terms of this paragraph as Bank may from
        time to time require."

6.      Except as provided above, the Agreement remains unchanged.

7.      This Amendment is effective as of 11/22/98 and the parties hereby
confirm that the Agreement as amended is in full force and effect.


Alpha Microsystems

By: ____________________________

Title: _________________________

By: ____________________________

Title: _________________________


Imperial Bank

By: ____________________________

Title: _________________________