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From: dan@srs.UUCP (Dan Kegel)
Newsgroups: net.micro.pc
Subject: re: MS-DOS vs PC-DOS
Message-ID: <207@srs.UUCP>
Date: Mon, 27-Oct-86 09:07:29 EST
Article-I.D.: srs.207
Posted: Mon Oct 27 09:07:29 1986
Date-Received: Wed, 29-Oct-86 21:55:28 EST
Distribution: net
Organization: S.R. Systems, Rochester NY
Lines: 17

MS-DOS and PC-DOS may also differ slightly internally.  
I (fuzzily) recall two cases:
1.  In DOS 2.?, the EXEC function call was located in the transient portion of 
    COMMAND.COM in PC-DOS, but in the resident part of MS-DOS.
2.  The MS-DOS programmer's reference manual mentions that the device driver
    loader of PC-DOS can only handle .bin style files, but the MS-DOS version
    can also handle .exe style files (!).

It isn't obvious why these differences exist (if they do); maybe Microsoft 
has to deliver to IBM so far in advance that, by the time IBM releases
its version of DOS, Microsoft has already added a few more features.

- Dan Kegel
seismo!rochester!srs!dan

Disclaimer: I'm actually still asleep; the opinions expressed above are
not those of my conscious mind.