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- 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
-
- 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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