Re: (VPIX) restore DOS 5.0 backup disks using DOS 3.3 restore?

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Article #527

#527

From: Jack Strangio
Date: Fri, 11 Dec 1992 19:16

19 lines
1560 bytes

todd@uhunix.uhcc.Hawaii.Edu (Todd Ogasawara) writes:
> I need to restore a set of backup disks created using MS-DOS 5.0's
> BACKUP.EXE to a system running ISC UNIX 3.0's vpix MS-DOS emulator.
> The MS-DOS 3.3 restore program that comes with it cannot do the job
> and moving MS-DOS 5.0's RESTORE.EXE results in a "wrong DOS version"
> message.
> 
Step through the MS-DOS 5.0's RESTORE with DEBUG. Very close to the start
there is an int21 function 30hex call to obtain the DOS version. Following
this there are conditional jumps to abort with the "Wrong Dos" message
or to proceed. Patch in the jump vector so that you proceed to the restore
code, and away you go!.

Jack
-- 
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 Jack Strangio                                 -  Voice +61-8-269 1509
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Message-ID: <1992Dec11.191615.1285@jacks.apana.org.au>

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References: <1992Dec4.181350.8988@news.Hawaii.Edu>

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Newsgroups: comp.unix.msdos,comp.unix.sysv386
Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!Germany.EU.net!news.netmbx.de!mailgzrz.TU-Berlin.DE!math.fu-berlin.de!ira.uka.de!yale.edu!think.com!rpi!batcomputer!munnari.oz.au!ariel.ucs.unimelb.EDU.AU!werple.apana.org.au!hal9000!jacks!jvs
From: jvs@jacks.apana.org.au (Jack Strangio)
Subject: Re: (VPIX) restore DOS 5.0 backup disks using DOS 3.3 restore?
Message-ID: <1992Dec11.191615.1285@jacks.apana.org.au>
Organization: Prospect 5082, AUSTRALIA
References: <1992Dec4.181350.8988@news.Hawaii.Edu>
Date: Fri, 11 Dec 92 19:16:15 GMT
Lines: 19

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