Exhibit 4.11
**HALIFAX CORPORATION**
**AMENDMENT TO 8% PROMISSORY NOTES**
     THIS AGREEMENT is made and entered into, effective for all purposes and in all respects as ofthe 29th day of June 2005 by and between (i) HALIFAX CORPORATION, a Virginia corporation (the“Company”) and (ii) the ARCH C. SCURLOCK CHILDREN’S TRUST, dated December 9, 2003 (the “Trust”).
WITNESSETH
     WHEREAS, the Company is indebted to the Trust (pursuant to the Assignment of Promissory Notesdated as of October 18, 2004 by and between the Arch C. Scurlock Trust, dated June 13, 1997 andmade irrevocable on December 9, 2002 and the Nancy M. Scurlock Trust, dated December 9, 2002 andthe Trust) in the aggregate principal amount of One Million Dollars ($1,000,000), with interestthereon pursuant to the 8% Promissory Notes dated October 8, 1998, October 13, 1998, November 2,1998 and November 5, 1998 (the “Notes”);
     WHEREAS, the Subordination Agreement, dated March 6, 2002, by and among the Company, ResearchIndustries and Provident Bank (successor by merger to Southern Financial Bank) (the “SubordinationAgreement”) subordinates the Notes to the Senior Loan Facility (as defined below) and prohibitsrepayment of principal of the Notes while the Senior Loan Facility is outstanding without priorapproval from the Company’s lender under the Senior Loan Facility;
     WHEREAS, in order to correct the inherent inconsistencies between the Notes and theSubordination Agreement, the Company and the Trust wish to extend the maturity date of the Notes toJuly 1, 2007, which date is the next day immediately succeeding the expiration of the Amended andRestated Loan and Security Agreement, dated as of November 8, 2004, by and between the Company,Halifax Engineering, Inc., a Virginia corporation, Microserv LLC, a Delaware limited liabilitycompany and Halifax AlphaNational Acquisition, Inc., a Delaware corporation, and Provident Bank, aMaryland banking corporation, of Baltimore, Maryland, and the successor by merger to SouthernFinancial Bank which Amended and Restated Loan and Security Agreement combines, amends and replacesthe Security Agreement dated as of March 6, 2002, Change in Terms Agreements dated as of March 12,2002 and April 3, 2003 and ARTS Security and Finance Agreement dated as of September 9, 2003, eachexecuted by the Company and Bank, as amended, as may be amended and further extended from time totime (the “Senior Loan Facility”);
     WHEREAS, the Trust wishes to waive any rights it has regarding the acceleration of the Notesand the Company’s requirement that the Company provide the Trust with notice of events of defaultunder the Notes which may have arisen or occurred prior to the date of this Agreement, it beingunderstood that the Trust is not waiving its rights regarding the acceleration of the Notes as aresult of, or notice of, any events of default under the Notes arising on or after the date hereof;
 

 

     NOW, THEREFORE, in consideration of the mutual covenants made herein and other good andvaluable consideration, receipt of which is hereby acknowledged, the Company and the Trust herebyagree as follows:
     A. Recitals; Defined Terms. The foregoing recitals are hereby incorporated by thisreference and made a substantive part hereof.
     B. Extensionof the Maturity Date of the Notes. The Company and the Trusthereby agree that the maturity date of the Notes shall be July 1, 2007, which date is the next dayimmediately succeeding the expiration of the Senior Loan Facility.
     C. Waiver of Prior Events of Default. The Trust hereby waives any rights it hasregarding the acceleration of the Notes and the Company’s requirement that the Company provide theTrust with notice of events of default under the Notes which may have arisen or occurred prior tothe date of this Agreement, it being understood that the Trust is not waiving its rights regardingthe acceleration of the Notes as a result of, or notice of, any events of default under the Notesarising on or after the date hereof.
     D. Representation and Warranties.
     1. The Company hereby represents and warrants as follows (with the effectiveness of thisAgreement being further conditioned upon all such representations and warranties being true andcorrect in all material respects on the date of this Agreement):
 (a) The execution, delivery and performance by the Company of this Agreement havebeen duly authorized by all necessary corporate action; and  (b) This Agreement constitutes the legal, valid and binding obligation of theCompany, enforceable against it in accordance with its respective terms, except to theextent that such enforcement may be limited by applicable bankruptcy, insolvency,equitable remedies and other similar laws affecting creditors’ rights generally, andexcept that the availability of equitable remedies is subject to the discretion of thecourt before which such remedies are sought.
     2. The Trust hereby represents and warrants as follows (with the effectiveness of thisAgreement being further conditioned upon all such representations and warranties being true andcorrect in all material respects on the date of this Agreement):
 (a) The execution, delivery and performance by the Trust of this Agreement havebeen duly authorized by all necessary corporate action; and  (b) This Agreement constitutes the legal, valid and binding obligation of theTrust, enforceable against it in accordance with its respective terms, except to theextent that such enforcement may be limited by applicable bankruptcy, insolvency,equitable remedies and other similar laws affecting creditors’ rights generally, andexcept that the availability of equitable remedies is subject to the discretion of thecourt before which such remedies are sought.
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     E. Effect on the Agreement. Except as specifically amended or agreed to hereby, theNotes shall continue to be in full force and effect and are hereby in all respects ratified andconfirmed. This Agreement shall be binding upon, and shall inure to the benefit of, the partieshereto and their respective successors and assigns.
     F. Execution in Counterparts. This Agreement may be executed in any number ofcounterparts and by different parties hereto in separate counterparts, each of which when soexecuted and delivered shall be deemed to be an original and all of which taken together shallconstitute but one and the same agreement. Delivery of an executed counterpart of a signature pageto this Agreement by telecopier or facsimile shall be effective as delivery of a manually executedcounterpart of this Agreement.
[Signature Page Follows]
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     IN WITNESS WHEREOF, the parties have caused this Agreement to be duly executed on theirbehalf in their respective corporate names by their duly authorized officers all as of the datefirst above written.         HALIFAX CORPORATION         By: /s/ Joseph Sciacca         Name: Joseph. Sciacca    Title: Chief Financial Officer         ARCH C. SCURLOCK CHILDREN’S TRUST,  dated December 9, 2002         By: /s/ Mary Scurlock Adamson         Name: Mary Scurlock Adamson, Trustee         By: /s/ John H. Grover         Name: John H. Grover, Trustee         By: /s/ Arch C. Scurlock, Jr.         Name: Arch C. Scurlock, Jr., Trustee         By: /s/ Nancy M. Scurlock         Name: Nancy M. Scurlock, Trustee
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