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Path: utzoo!mnetor!seismo!brl-adm!rutgers!nike!ucbcad!ucbvax!sdcsvax!osbook
From: osbook@sdcsvax.UCSD.EDU (osbook)
Newsgroups: net.micro.pc
Subject: Re: Booting xenix/microport unix from drives other than C:
Message-ID: <2190@sdcsvax.UCSD.EDU>
Date: Sun, 9-Nov-86 00:30:13 EST
Article-I.D.: sdcsvax.2190
Posted: Sun Nov  9 00:30:13 1986
Date-Received: Sun, 9-Nov-86 06:00:17 EST
References: <69@reality1.UUCP>
Reply-To: osbook@sdcsvax.UUCP (osbook)
Organization: U.C. San Diego
Lines: 40
Keywords: PC/AT unix boot

In article <69@reality1.UUCP> james@reality1.UUCP (james) writes:
>Is it possible to boot Xenix or Microport's unix from a second hard disk?  I
>have two hard disks.  I am considering using one for DOS and the other for
>xenix/unix.  Since (to the best of my knowledge) DOS must boot from drive C:,
>this implies that Xenix needs to boot from drive D:.  Is there a way of doing
>this by running a boot program under DOS, or booting the computer from a
>floppy disk (which then boots xenix/unix from D:)?
>-- 
>James R. Van Artsdalen    ...!ut-ngp!utastro!osi3b2!james    "Live Free or Die"

Try this:

(The idea is to use a very small DOS partition on the C: disk
only to get things going.  When you boot DOS, the system will immediately
switch to D:.  This allows you to use all of D: for DOS and almost
all of C: for XENIX.)

1) Backup both DOS AND XENIX
2) Reinstall Xenix.  When you get to the part where you partition the disk
give almost all the room to Xenix.  Leave only a small partition for DOS.
3) Format the small DOS C: parition using /s (and, /v as a good habit)
4) Use FDISK to partition the D: DISK
5) Use FORMAT (without /s) and format D:
6) Restore all your DOS files to the D: disk
                                     =======
7) Move CONFIG.SYS to the small C: partition
8) Write a small autoexec for C: that does nothing but
	d:
	autoexec


Here is what happens.  When you boot Xenix, all works as usual.
When you boot DOS the basic DOS files and CONFIG are found in the C:
partition.  However, the small C:AUTOEXEC effectively
starts DOS on the D: disk.

By the way, if you are using DOS and XENIX on the same computer,
you ought to write a couple of programs to automatically
switch from one OS to the other.  If you do not know
how to do this, send me mail and I'll show you.