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Article #5557

Re: Dos and unix on same Disk

#5557
From: Aris Zakinthinos
Date: Mon, 01 Apr 1991 00:43
25 lines
1667 bytes
A friend and I spent a couple of hours one day tring to get SCO unix
to accept DOS partitions of > 32k on another friends machine.
Well we finally did it.  The problem is as follows:

If the DOS partition is > 32k the DOS type (this is what we called it
it  may be really b e called something else) is 6.  In the boot up
code SCO only checks for DOS types of 4 and 2? (I don't remeber if it is
really 2 but it is another number).  With the advent of partions of
greater 32k Microsoft introducted DOS type 6.  The way we got
SCO to recognize the >32k partion is to change the comparison of 2 to
6.  We don't know if there are any adverse affects to this change but 
everything seems to be working fine.

I don't exactly remember where the boot up code was found (we
traced through the boot up process with a debugger)
so I can't tell you how to change it but when I go home I will
see if I can find the info.

The other way we though might work is to simply change the 6 to a 4
in the Master boot track.  We didn't go for this option as we don't
know what affect this wil have on DOS (if any).

Hope this gives some insight.

Aris.
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Message-ID: <1991Apr1.004301.27724@watdragon.waterloo.edu>
Path: arc1-ca.pugleaf.net!utzoo!utgpu!watserv1!watdragon!lion!azakinthinos
References: <1991Mar30.224536.603@panix.uucp> <fx!gsyc@rpi.edu>

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Newsgroups: comp.os.msdos.programmer,comp.unix.sysv386
Path: arc1-ca.pugleaf.net!utzoo!utgpu!watserv1!watdragon!lion!azakinthinos
From: azakinthinos@lion.uwaterloo.ca (Aris Zakinthinos)
Subject: Re: Dos and unix on same Disk
Message-ID: <1991Apr1.004301.27724@watdragon.waterloo.edu>
Sender: daemon@watdragon.waterloo.edu (Owner of Many System Processes)
Organization: University of Waterloo
References: <1991Mar30.224536.603@panix.uucp> <fx!gsyc@rpi.edu>
Distribution: na
Date: Mon, 1 Apr 1991 00:43:01 GMT
Lines: 25