DOS 3.20

From: Fred Cisin <>
Date: Sat Jan 11 23:59:00 2003

On Sat, 11 Jan 2003, John Willis wrote:
> IBM PC-DOS or Micro$oft MS-DOS? I have the PC-DOS 3.20 manual.

The only difference that I found between them (except for certain highly
customized OEM MS-DOS versions) was DRIVPARM. It is present in both, but
is not documented in PC-DOS. It is incompatible with the IBM BIOS.

(DRIVPARM worked with both PC-DOS and MS-DOS with three different generic
clones; DRIVPARM would not work with either MS-DOS nor PC-DOS on real IBM
AT and PS/2 (model 50?))

Some OEMs included the "technical reference manual" as appendix to their
MS-DOS manual. IBM sold it as a separate book after 2.00.
Received on Sat Jan 11 2003 - 23:59:00 GMT

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