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Article #247Re: Patch GRAPHICS.COM (DOS 4.0) to run under DOS 3.3 ?
From: Michael Schuster
Date: Wed, 15 Nov 1989 23:14
Date: Wed, 15 Nov 1989 23:14
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1453 bytes
In article <2961@einstein.ptolemy.arc.nasa.gov> raymond@ptolemy.arc.nasa.gov (Eric A. Raymond) writes: >For obscure reasons, I need to run GRAPHICS.COM under DOS 3.3 (to get >VGA screen dumps). Unfortunately it gives me the message: > > Incorrect DOS Version > >when I run it under DOS 3.3. I just tried tracing through the binary, >made one obvious change, one less obvious change, but it still would't >work. > >Any patches out there? The version-check code in most of the DOS 4 external programs looks like this: B4 30 MOV AH,30 CD 91 INT 21 3D 04 00 CMP AX,4 75 03 JNZ 176B If you replace the last line of code (75 03) with NOP's the version test will be ignored. -- l\ /l' _ Mike Schuster ...!dasys1!schuster l \/ lll/(_ Big Electric Cat schuster@dasys1.UUCP CIS:70346,1745 l lll\(_ New York, NY USA BIX,DELPHI,GEnie:MSCHUSTER
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arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!shadooby!samsung!brutus.cs.uiuc.edu!apple!rutgers!cmcl2!dasys1!schusterReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!shadooby!samsung!brutus.cs.uiuc.edu!apple!rutgers!cmcl2!dasys1!schuster From: schuster@dasys1.UUCP (Michael Schuster) Newsgroups: alt.msdos.programmer,comp.sys.ibm.pc,comp.binaries.ibm.pc.d Subject: Re: Patch GRAPHICS.COM (DOS 4.0) to run under DOS 3.3 ? Message-ID: <11234@dasys1.UUCP> Date: 15 Nov 89 23:14:59 GMT References: <2961@einstein.ptolemy.arc.nasa.gov> Reply-To: schuster@dasys1.UUCP (Michael Schuster) Organization: The Big Electric Cat; New York, N.Y. USA Lines: 29