Xref: utzoo comp.sys.att:12050 comp.os.msdos.programmer:4222 comp.unix.internals:2419 comp.unix.sysv386:6307
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!apple!netcom!cmilono
From: cmilono@netcom.COM (Carlo Milono)
Newsgroups: comp.sys.att,comp.os.msdos.programmer,comp.unix.internals,comp.unix.sysv386
Subject: Re: Dos and unix on same Disk
Message-ID: <1991Mar25.173644.3583@netcom.COM>
Date: 25 Mar 91 17:36:44 GMT
References: <13719@ccncsu.ColoState.EDU>
Distribution: na
Organization: Netcom - Somewhere in the S.F. Bay Area
Lines: 35

In article <13719@ccncsu.ColoState.EDU> justicec@handel.cs.colostate.edu (Christopher Justice) writes:
>I'm having a problem installing both AT+T System V R3.2.2 and Dos 4.0 on the 
>same disk drive.  I partioned the drive (330 meg) into an 80 meg Dos 
>partition and the rest for unix.  They installed succesfully, but Dos gives
>me a "General failure reading drive C:" when I try to run programs.  This
>happens irregularly.  Unix has given me a couple of "unrequested harddrive
>interrupt errors". 
>
>Our computer Vendor is trying to tell us that you can not install unix
>and dos on the same drive, or possibly that dos can not take up more than
>9% of the drive.  I find this hard to believe.  If Dos and unix are on
>different partitions, it shouldn't matter.  
>
>Is using Dos and unix on the same drive common?  Can you do this?  I'd like
>to hear about your experience with doing this.
>
My PC at home is setup with 120MB of UNIX V 3.2.3 and 32MB of DOS 3.3.  I
initialized the HDU upon booting/loading the UNIX foundation set and 
requested the above mentioned partitions;  I finished loading UNIX, did
a UNIX version of FDISK, switched to the DOS partition, formatted it with
the OS, loaded my apps, and voila!

In addition, I loaded Simultask on the UNIX partition, loaded DOS (same
version), and did a 'dosslice' so that I can run DOS apps resident on
the DOS partition from the DOS emulator on the UNIX partition.  I have
had no problems.  I have seen troubles with DOS 4.0 in the following
scenarios:
	1) the machine had 'antique' BIOS
	2) the DOS was for a different machine (Compaq DOS on an ALR, e.g.)
-- 
+--------------------------------------------------------------------------+
|  Carlo Milono:  cmilono@netcom.apple.com   or   apple!netcom!cmilono     |
|"When a true genius appears in the world, you may know him by this sign,  |
|that the dunces are all in confederacy against him."   - Jonathan Swift   |
+--------------------------------------------------------------------------+