Document:

<PAGE>   1
                                                                   EXHIBIT 10.bc

                              EMPLOYMENT AGREEMENT

SBS TECHNOLOGIES, INC. ("Company") and CHRISTOPHER J. AMENSON agree:

1.       EMPLOYMENT. Company and Employee agree to the terms of employment,
         effective the date of this Agreement, for the period beginning on the
         date of this Employment Agreement and ending one year from its date or
         upon discharge or resignation of Employee (the "Employment Period").
         This agreement will automatically renew on each succeeding anniversary
         date unless either party elects to cancel it. During the Employment
         Period, Employee will serve in the capacities determined by the
         Company. Employee will devote sufficient time and energies to the
         business of Company to accomplish the duties assigned, will perform to
         the best of Employee's ability all duties assigned to Employee by
         Company and will devote Employee's best efforts to advance the
         interests of Company. Employee will have the power and authority
         determined by Company.

2.       COMPENSATION. For all services performed by Employee for Company during
         the Employment Period, Company will pay Employee the salary set forth
         in Schedule "A". Employee will be entitled to participate in employee
         benefit plans established by the Company. Vacation in amounts
         designated by the Company will be taken at the times designated by
         Company. During that vacation Employee will receive Employee's usual
         compensation.

3.       REIMBURSEMENT OF EXPENSES. Company recognizes that Employee in
         performing Employee's duties hereunder, may be required to spend sums
         of money in connection with those duties for the benefit of Company.
         Employee may present to Company an itemized voucher listing expenses
         paid by Employee in the performance of Employee's duties on behalf of
         Company, and on presentation of such itemized voucher, Company will
         reimburse Employee for all reasonable expenses itemized thereon,
         including, but not limited to, travel, meals, lodging, entertainment,
         and promotion with respect to all activities approved in advance by the
         Company. Employee may receive advances from Company for anticipated
         expenses. Employee agrees that the amount by which an advance exceeds
         actual expenses ("Amount") will be promptly refunded to Company upon
         determination by Company that it is due, that the Amount may be
         deducted from any payments of any nature (including without limitation
         salary) owed by Company to employee, and that the Amount will
         constitute a debt from Employee to Company, enforceable by Company in
         all respects as if Employee had executed a promissory note or other
         instrument acknowledging the debt, bearing interest at a rate of 10%
         per year from the date repayment is due and payable in full on demand
         without set-off or deduction.

4.       SICK LEAVE AND DISABILITY. Employee will be entitled to sick leave for
         the number of days determined by Company ("Sick Leave"). Employee will
         be considered to be disabled during any period in excess of Sick Leave
         during which Employee is unable to work because of illness or
         incapacity ("Disability Period"). Employee will be entitled to receive
         Employee's full salary during Sick Leave and will be deemed to be on
         leave, without pay, during the Disability Period. If Employee is unable
         to work for a period in excess of 180 days, the Employee, at the
         discretion of the Board of Directors of Company, will be considered to
         have resigned. In no event will Employee be entitled to payment or
         other compensation for unused Sick Leave or Disability Period, unless
         required by law or otherwise provided in a policy or employment manual
         adopted by the Board of Directors of Company.

5.       RESTRICTIONS. Employee may not during the Employment Period, and for a
         period of two years following the termination of the Employment Period,
         anywhere in the United States, directly or indirectly, own, manage,
         operate, invest in, control, be employed by, participate in, be a
         financial sponsor of, or be connected in any manner with the ownership,
         management, operation or control of any business which competes with a
         business conducted by Company at any time during the Employment Period
         or a business which Employee knows, during the Employment Period, that
         Company intends to conduct. Employee acknowledges that this restriction
         is necessary for the Company's welfare and protection in light of the
         responsibilities assigned to

<PAGE>   2

         Employee and Employee's status in the Company, that Employee is fully
         and adequately compensated for this restriction, and that Company may
         enforce this restriction through injunctive relief without limiting any
         other relief which may be available to it.

6.       RESIGNATION AND DISCHARGE. Employee may resign by giving three months
         written notice to Company before resigning. Employee's death will
         constitute a voluntary resignation. Company may discharge Employee
         without cause upon three months written notice. If the Employment
         Period is terminated by resignation or discharge without cause,
         Employee will be paid at Employee's salary on a pro-rata basis through
         the effective date of resignation or discharge ("Effective Date"), and
         if requested by Company, employee will continue to render Employee's
         services through the Effective Date. In addition, for a period of two
         (2) years following Effective Date, Employee will remain a consultant
         to the Chief Executive Officer and Board of Directors of the Company.
         During that two year period, Employee will be available to consult for
         up to 5 days per 3 month period, and will receive compensation, paid
         bi-weekly, at an annual rate of 10% of the Employee's annual rate of
         pay at time of resignation. In addition, Employee will be designated by
         the Company's Board of Directors as eligible to participate in the
         Company's medical plans (including the medical, visual, dental and any
         substitute or similar plans adopted by Company). Company and Employee
         will pay the same respective shares of the costs of these plans as
         Company and full-time employees of Company pay. If during the
         Employment Period, Employee violates any provision or restriction or
         fails to perform any obligation contained in this Employment Agreement
         or in any Company policy or Company employment manual or practice, or,
         unless otherwise provided by Company policy or Company employment
         manual, (a) is reasonably believed by Company (i) to have failed to
         comply with any employment or nondiscrimination or similar law,
         regulation or policy, (ii) to abuse, as determined by the Company,
         alcohol or to use drugs, (other than as prescribed by Employee's
         physician), or (b) refuses to submit to testing for alcohol or drugs,
         or (c) is reasonably believed by Company to have committed or is
         charged with any felony or misdemeanor (except minor traffic violations
         and similar offenses), Company may immediately discharge Employee
         without liability for salary after the date of the discharge and
         without any other liability to Employee. In no event will Employee be
         entitled, upon resignation or discharge with or without cause, to
         payment for sick leave or similar benefits of any kind unless required
         by law or otherwise provided in a policy or employment manual adopted
         by the Board of Directors of Company.

7.       CONFIDENTIAL INFORMATION. Employee acknowledges and recognizes that
         Employee is, or will be, employed by Company in a confidential
         relationship and may receive and have access to the confidential
         business information, customer names, contracts and other customer
         data, business methods, techniques and trade secrets of Company
         ("Confidential Information"). Employee may develop ideas, conceptions,
         inventions, processes, methods, products and improvements; and Employee
         may receive disclosures of ideas, conceptions, inventions, processes,
         methods, products and improvements made by other employees of Company
         ("Company Inventions"). Employee may participate with Company in
         improving and developing Confidential Information and Company
         Inventions. Confidential Information and Company Inventions developed
         on behalf of Company are neither commonly known nor readily accessible
         to others and are used by Company in its business to obtain a
         competitive advantage over Company's competitors who do not know or use
         the Confidential Information or Company Inventions. Protection of the
         Confidential Information and Company Inventions against unauthorized
         disclosure and use is of critical importance to Company in maintaining
         its competitive position. Employee agrees that Employee will not, at
         any time, during or after the Employment Period, make any independent
         use of, or disclose to any other person or organization, except as
         authorized by Company in writing, any Confidential Information or
         Company Inventions. Upon termination of the Employment Period for any
         reason, Employee shall promptly deliver to Company all drawings,
         manuals, letters, notes, notebooks, reports, customer lists, customer
         data, mailing lists, and all

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         other materials and records of any kind, and all copies thereof, that
         may be in the possession of, or under the control of, Employee
         pertaining to Company's business including any that contain any
         Confidential Information or Company Inventions.

8.       PERSONNEL POLICIES. Company's personnel policies apply to all of
         Company's employees including Employee and describe additional terms
         and conditions of employment of Employee. Those terms and conditions,
         as they may be revised from time to time by Company, are incorporated
         by reference into this Employment Agreement. Company reserves the right
         to revise the personnel policies from time to time, as Company deems
         necessary. If any personnel policy provision conflicts with a provision
         of this Employment Agreement, the terms of this Employment Agreement
         shall govern.

9.       ALCOHOL AND DRUG TESTING. Employee agrees to comply with and submit to
         any Company program or policy for testing for alcohol abuse or use of
         drugs.

10.      BINDING EFFECT. This Employment Agreement constitutes the entire
         understanding of the parties, may be modified only in writing, is
         governed by laws of New Mexico, and will bind and inure to the benefit
         of Employee and Employee's personal representative and Company and
         Company's successors and assigns.

         DATED:            December 27, 2000

                           COMPANY:
                           SBS TECHNOLOGIES, INC.

                           By: /s/ Lawrence A. Bennigson
                               -------------------------
                           Lawrence A. Bennigson, Ph.D.
                           Chairman, Management Development &
                             Compensation Committee
                           Board of Directors

                           EMPLOYEE:

                           /s/ Christopher J. Amenson
                               -------------------------
                           Christopher J. Amenson
                           Chief Executive Officer and President

<PAGE>   4

                                   SCHEDULE A

  The annual rate of pay of Employee, effective January 1, 2001 shall be
$400,000.
<PAGE>   5

                        Addendum to Employment Agreement
                                       Of
                             Christopher J. Amenson

         This Addendum to the Employment Agreement between SBS Technologies,
Inc. ("Company") and Christopher J. Amenson ("Employee") dated December 27,
2000, sets forth the specific duties of Employee, pursuant to Paragraph 1 of the
Employment Agreement, as of March 9, 2001:

     o    Employee will work a minimum of 5 days per fiscal quarter;

     o    Employee will assist the President and Chief Executive Officer of the
          Company with Company business strategies, customer relations and
          acquisitions; and

     o    Employee will perform such other duties as the Board of Directors,
          from time to time, may designate.

     All provisions of the Employment Agreement dated December 27, 2000 remain
unchanged and in full force.

     Dated:  April 27, 2001

                                            SBS Technologies, Inc.

                                            By: /s/ Lawrence A. Bennigson
                                                -------------------------------
                                            Lawrence A. Bennigson, Ph.D.
                                            Chairman, Management Development &
                                              Compensation Committee
                                            Board of Directors

                                            Employee

                                            By:  /s/ Christopher J. Amenson
                                                -------------------------------
                                            Christopher J. Amenson<PAGE>   1

                                                                   EXHIBIT 10.bd

            THIRD MODIFICATION OF CREDIT AGREEMENT, PROMISSORY NOTE,
                 GUARANTY AGREEMENTS AND RELATED LOAN DOCUMENTS

         THIS THIRD MODIFICATION OF CREDIT AGREEMENT, GUARANTY AGREEMENTS AND
RELATED LOAN DOCUMENTS (this "Modification Agreement") is entered into as of
March 31, 2001, by and between SBS TECHNOLOGIES, INC., a New Mexico corporation
("Borrower"), BANK OF AMERICA, N.A., formerly NationsBank, N.A., a national
banking association ("Lender"), and the Subsidiaries of Borrower listed as
Guarantors on the signature pages hereof (the "Guarantors").

                                    RECITALS:

         WHEREAS, Borrower and Lender (under its prior name, NationsBank, N.A.)
have previously executed that certain Credit Agreement (as modified, amended and
supplemented from time to time, the "Credit Agreement") dated as of December 1,
1998, pursuant to which Lender has made available to Borrower a revolving credit
loan facility, which Credit Agreement has been amended by (i) that certain Note
Modification Agreement dated as of November 30, 1999, (ii) Modification of
Credit Agreement, Guaranty Agreements and Related Loan Documents dated as of
January 31, 2000 (the "First Modification") and (iii) Second Modification of
Credit Agreement, Guaranty Agreements and Related Loan Documents dated as of
March 31, 2000 (the "Second Modification") (any capitalized term used but not
otherwise defined herein shall have the meaning set forth in the Credit
Agreement); and

         WHEREAS, the indebtedness under the Credit Agreement is evidenced by
that certain Second Amended and Restated Revolving Promissory Note (the "Second
Restated Note") dated March 31, 2000, in the principal face amount of
$30,000,000.00, executed by Borrower and payable to the order of Lender, which
Second Restated Note amended and restated that certain Amended and Restated
Revolving Promissory Note dated January 31, 2000, in the principal face amount
of $25,000,000.00, which had amended and restated that certain Revolving
Promissory Note dated December 1, 1998, in the principal face amount of
$15,000,000.00, executed by Borrower and payable to the order of Lender; and

         WHEREAS, Borrower and the Guarantors have requested an extension of the
revolving credit facility until December 31, 2002, and Lender has agreed to such
extension, subject to and upon the terms and conditions hereof.

                                   AGREEMENT:

         NOW, THEREFORE, KNOW ALL MEN BY THESE PRESENTS, that for and in
consideration of the terms, conditions and agreements contained herein and for
other

THIRD MODIFICATION OF CREDIT AGREEMENT                                    PAGE 1

<PAGE>   2

good and valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, Lender, Borrower and the Guarantors agree as follows:

         1. Extension of Termination Date. The termination of the revolving
credit facility is extended from March 31, 2001, to December 31, 2002, subject
to the terms and conditions set forth in the Credit Agreement. Accordingly,
clause (i) of the definition of "Termination Date" in Section 1.1 of the Credit
Agreement (as previously amended by the First Modification and the Second
Modification) is amended to insert the date "December 31, 2002", in place of
"March 31, 2001." Each and every reference to the "Termination Date" in the
Credit Agreement, the Second Restated Note, the Guaranty Agreements and any
other Loan Document shall mean and refer to such new Termination Date, including
without limitation the reference in Paragraph 1(a) of the Second Restated Note
to the Termination Date as the maturity date of the such note.

         2. Definition of Documents. All references to the Credit Agreement
therein and in the other Loan Documents shall mean the Credit Agreement as
amended hereby. The definition of "Loan Documents", as defined in and as used in
the Credit Agreement, each Guaranty Agreement and all other Loan Documents,
shall be, and is hereby, modified to include this Modification Agreement and any
and all documents executed in connection herewith.

         3. Merger Transaction. Borrower represents to Lender that SBS
Technologies, Inc., Telemetry and Communications Products, f/k/a SBS Berg
Telemetry Systems, Inc. ("SBS Telemetry"), was merged into Borrower, with
Borrower being the surviving corporation, as evidenced by Certificate of Merger
of SBS Technologies, Inc. #3203635 issued June 23, 2000, by the Office of the
Public Regulation Commission of the State of New Mexico, and the Articles of
Merger and Plan of Merger of Subsidiary Corporation attached thereto; and Lender
consents to such merger. Accordingly, SBS Telemetry is no longer in existence as
a separate corporation and is no longer a Guarantor; provided, however, that all
assets of SBS Telemetry shall continue to be covered by and subject to the
Security Agreement, and pledged as security for the Obligations pursuant
thereto, as assets of Borrower as a result of such merger.

         4. Reaffirmation of Obligations. Borrower and the Guarantors
acknowledge and agree that they are well and truly indebted to Lender pursuant
to the Credit Agreement, the respective Guaranty Agreements, the Second Restated
Note and the other Loan Documents, as modified hereby. Except as expressly
modified hereby, all terms, provisions, representations, warranties, covenants
and agreements of Borrower and each Guarantor contained in the Credit Agreement,
each Guaranty Agreement, and the other Loan Documents shall remain unchanged and
are hereby ratified and confirmed by Borrower and the Guarantors, and all such
agreements shall be and shall remain in full force and effect, enforceable in
accordance with their terms.

         5. No Implied Waivers. None of the amendments or modifications provided
for herein shall be deemed a consent to or waiver of any breach of the same or
any other covenant, condition or duty. Borrower and the Guarantors acknowledge
and understand

THIRD MODIFICATION OF CREDIT AGREEMENT                                    PAGE 2

<PAGE>   3

that Lender has no obligation to further amend or modify the Credit Agreement,
the Note, the Second Restated Note or any of the other Loan Documents, or any of
the terms, provisions or covenants thereof, and that Lender has made no
representations regarding any such amendments or modifications. No failure or
delay on the part of Lender in exercising, and no course of dealing with respect
to, any right, power or privilege under this Modification Agreement, the Credit
Agreement, the Guaranty Agreements, or any other Loan Document shall operate as
a waiver thereof or of the exercise of any other right, power or privilege.

         6. Representations and Warranties. Borrower hereby represents and
warrants to Lender that (a) the execution, delivery, and performance by the
Borrower and the Guarantors of this Modification Agreement and compliance with
the terms and provisions hereof (i) have been duly authorized by all requisite
action on the part of each such Person and (ii) do not, and will not violate or
conflict with, or result in a breach of, or require any consent under (A) the
articles of incorporation, certificate of incorporation, bylaws, partnership
agreement or other organizational documents of any such Person, (B) any
applicable law, rule, or regulation or any order, writ, injunction, or decree of
any Tribunal or arbitrator, or (C) any material agreement or instrument to which
any such Person is a party or by which any of them or any of their property is
bound or subject; (b) the signatories below have been duly authorized by all
necessary corporate action to make and enter into this Modification Agreement as
the duly authorized action and deed of Borrower and each of the Guarantors; (c)
the representations and warranties contained in the Credit Agreement, as amended
hereby, and the other Loan Documents are true and correct in all material
respects on and as of the date hereof as though made on and as of the date
hereof; and (d) upon execution and effectiveness hereof, no Default or Event of
Default has occurred and is continuing.

         7. Ratification. Except as otherwise expressly modified by this
Modification Agreement, all terms and provisions of the Credit Agreement, the
Second Restated Note, the Guaranty Agreements and the other Loan Documents shall
remain unchanged and are ratified and confirmed and shall be and shall remain in
full force and effect, enforceable in accordance with their terms.

         8. Further Assurances. Borrower shall execute and deliver to Lender
such other documents as may be necessary or as may be required, in the opinion
of Lender and/or counsel to Lender to effect the transactions contemplated
hereby and to create and evidence the rights and remedies of the Lender under
the Loan Documents.

         9. Inconsistent Provisions. This Modification Agreement shall control
in the case of any inconsistency between the terms and provisions hereof and
those contained in the other Loan Documents.

         10. Binding Agreement. This Modification Agreement shall be binding
upon, and shall inure to the benefit of, the parties hereto and their respective
legal representatives, successors and assigns.

THIRD MODIFICATION OF CREDIT AGREEMENT                                    PAGE 3

<PAGE>   4

         11. GOVERNING LAW. THIS MODIFICATION AGREEMENT SHALL BE CONSTRUED IN
ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW MEXICO, EXCEPT TO
THE EXTENT THAT UNITED STATES FEDERAL LAW APPLIES.

         12. Counterparts; Telecopies. This Modification Agreement may be
executed in multiple counterparts, each of which shall be deemed an original for
all purposes, and all of which, collectively, shall constitute one agreement. In
addition, due execution of this Modification Agreement by any party may be
evidenced by a telecopy reflecting such party's signature. Any party to this
Modification Agreement shall be entitled to receive upon request, from any other
party that has previously forwarded an executed counterpart of any such document
by telecopy, a duplicate of such document bearing such other party's ink
original signature.

         13. Entire Agreement. This Modification Agreement, the Credit
Agreement, the Second Restated Note and the Guaranty Agreements, together with
the other Loan Documents, contain the entire agreement between the parties
relating to the subject matter hereof and thereof.

         THIS MODIFICATION AGREEMENT, TOGETHER WITH THE CREDIT AGREEMENT AND THE
OTHER LOAN DOCUMENTS REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES AND MAY
NOT BE CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE
PARTIES.

       [REMAINDER OF PAGE INTENTIONALLY LEFT BANK-- SIGNATURES TO FOLLOW]

THIRD MODIFICATION OF CREDIT AGREEMENT                                    PAGE 4

<PAGE>   5

         IN WITNESS WHEREOF, this Modification Agreement is executed effective
as of the date first above written.

                                         BORROWER:

                                         SBS TECHNOLOGIES, INC.,
                                         a New Mexico corporation

                                         By:   /s/  James E. Dixon, Jr.
                                               ---------------------------------
                                               James E. Dixon, Jr.
                                               Vice President, Finance and
                                               Administration

                                         LENDER:

                                         BANK OF AMERICA, N.A., formerly
                                         NationsBank, N.A., a national banking
                                         association

                                         By:   /s/ Norman Butler
                                               ---------------------------------
                                              Name:   Norman Butler
                                                      --------------------------
                                              Title:  Vice President
                                                      --------------------------

                                         GUARANTORS:

                                         SBS TECHNOLOGIES, INC. CONNECTIVITY
                                         PRODUCTS, f/k/a SBS Bit 3 Operations,
                                         Inc.

                                         By:   /s/ James E. Dixon
                                               ---------------------------------
                                               James E. Dixon, Jr.
                                               Treasurer

                                         SBS TECHNOLOGIES INC. MODULAR I/O,
                                         f/k/a SBS Greenspring Modular I/O, Inc.

                                         By:   /s/ James E. Dixon, Jr.
                                               ---------------------------------
                                               James E. Dixon, Jr.
                                               Treasurer

THIRD MODIFICATION OF CREDIT AGREEMENT                                    PAGE 5

<PAGE>   6

                                         SBS TECHNOLOGIES, INC. EMBEDDED
                                         COMPUTERS, f/k/a SBS Embedded
                                         Computers, Inc.

                                         By:   /s/  James E. Dixon, Jr.
                                               ---------------------------------
                                               James E. Dixon, Jr.
                                               Treasurer

                                         SBS TECHNOLOGIES INC. INDUSTRIAL
                                         COMPUTERS, f/k/a SBS Micro Alliance,
                                         Inc.

                                         By:   /s/ James E. Dixon, Jr.
                                               ---------------------------------
                                               James E. Dixon, Jr.
                                               Treasurer

                                         SBS TECHNOLOGIES INC.
                                         COMMUNICATIONS PRODUCTS,
                                         f/k/a VI Computer

                                         By:   /s/ James E. Dixon, Jr.
                                               ---------------------------------
                                               James E., Dixon, Jr.
                                               Treasurer

                                         SDL COMMUNICATIONS, INC.

                                         By:   /s/ James E. Dixon, Jr.
                                               ---------------------------------
                                               James E., Dixon, Jr.
                                               Treasurer

THIRD MODIFICATION OF CREDIT AGREEMENT                                    PAGE 6

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