Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!unmvax!aplcen!haven!vrdxhq!bms-at!stuart
From: stuart@bms-at.UUCP (Stuart Gathman)
Newsgroups: comp.sys.ibm.pc
Subject: Re: 2 hard disks/2 floppies, dos and xenix
Summary: booting dos from second disk
Message-ID: <165@bms-at.UUCP>
Date: 29 Jun 89 19:03:38 GMT
References: <3831@udccvax1.acs.udel.EDU> <822@crdgw1.crd.ge.com> <1282@pkmab.se>
Organization: Business Management Systems, Inc., Fairfax, VA
Lines: 21


> 
> On my system (Xenix/386 2.3), I have patched the "dos" boot program to

I had no problems patching the "dos" boot program, but PC-DOS refused to
run from the second disk.  There was no inherent reason.  I traced and dis-
assembled about a dozen stages of the DOS boot process, patching code
of the form:

	cmp DL,80H
	jnz error

to NOPs getting further and further each time.  After three hours of this
nonsense, I gave up and decided that if MS didn't want me to boot DOS
from the second drive, I wasn't going to fight it.  This was PCDOS 3.1.

Is this behaviour removed in more recent releases?  Is it only in
IBM versions?
-- 
Stuart D. Gathman	<stuart@bms-at.uucp>
			<..!{vrdxhq|daitc}!bms-at!stuart>