Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!purdue!ames!ucsd!sdcsvax!ucsdhub!sdsu!munin!ucselx!weston
From: weston@ucselx.uucp (weston t)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Some questions about a Leading Edge Model M
Keywords: Leading Edge, hard disk, bios
Message-ID: <3783@munin.UUCP>
Date: 18 May 89 22:37:28 GMT
References: <7522@spool.cs.wisc.edu> <4261@sybase.sybase.com>
Sender: news@munin.UUCP
Reply-To: weston@ucselx.UUCP (weston t)
Organization: San Diego State University Computing Services
Lines: 19

I added a ST-225 hard disk to my model M. this disk is slow (65 ms.),
but otherwise quite satisfactory. I forget the name of the controller--
I'll check it out if anyone asks me. I also upgraded to DOS 3.1, because
some software (like Microsoft Codeview didn't work on 2.11, and Microsoft
was ABSOLUTELY no help on the phone). There is supposed to be a version of 
DOS 3.x available from Sperry (who still sell the leading edge with
their label on it) but I understand they are not willing to part with it.
I used a OEM-modified 3.1 from Falcon technologies, but it would not set
the leading edge clock properly. I found the right bios call to do this,
and wrote a TP5.0 routine to call it.  works fine, will send it if asked.
I also had some peculiar behavior on hard disk errors and soft boots, so
I (1) found the dying sector (only one in 4 years) and marked it, and (2)
bought some new bios chips ($20) from by local dealer. no further problems
although it buzzes briefly on soft boots.

Tom Weston
ucsd.edu!sdsu!ucselx!weston

Disclaimer: SDSU could care less what I think.