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From: kav@ihlpa.ATT.COM (K. Vangsness)
Newsgroups: comp.os.minix
Subject: Re: Does MINIX work on the AT&T PC6300 Plus?
Message-ID: <4512@ihlpa.ATT.COM>
Date: Thu, 2-Jul-87 13:14:09 EDT
Article-I.D.: ihlpa.4512
Posted: Thu Jul  2 13:14:09 1987
Date-Received: Sat, 4-Jul-87 08:07:56 EDT
References: <994@houxu.UUCP>
Organization: AT&T Bell Laboratories - Naperville, Illinois
Lines: 32
Keywords: yet?
Summary: MINIX on 6300+ works!


MINIX does work on the 6300+. I have a 6300+ the came with a
360K floppy and was able to boot up the 360K MINIX floppys
with no problem. For reasons that I don't yet understand, the
same floppys do not work on the plus if it has a 1.2MB floppy.
(I know because I just upgraded my system to a 1.2MB floppy and
I can no longer boot MINIX - all other 360K floppys work fine)
The system comes up, process 3 starts up (a shell reading /etc/rc?)
and eats lots of CPU time.

When I was able to boot my 6300+ on MINIX, I got the hard disk working.
This required the following changes: (sorry I'm not specific here, but
I don't have the changes handy - If anyone wants the actual changes,
send me mail.)

	Force the cpu type (in main.c) to be an XT. The 6300+ looks
	like an AT to MINIX, but the hard disk interrupts at the
	XT vector.

	Apply Gary Olivers fixes to the xt_wini driver. I Then 
	had to hard code the disk parameters for the 20 MB
	drive into the drive initialization function. For some
	reason it though the hard drive had 5 heads!
	The values I used were 4 heads, 611 cylinders, control byte = 5.

	
Also, my hard disk has a defect at cylinder 46. Has anyone modified
mkfs so that it will take bad blocks out of the free list?

	Kurt Vangsness
	AT&T Bell Laboratories - Naperville, Ill
	ihnp4!ihlpa!kav