Path: utzoo!attcan!uunet!husc6!ukma!cwjcc!hal!ncoast!mikes
From: mikes@ncoast.UUCP (Mike Squires)
Newsgroups: comp.sys.tandy
Subject: Re: Tandy 6000 Hard drives
Summary: I had no problems
Keywords: external hard drive replacement
Message-ID: <12876@ncoast.UUCP>
Date: 6 Nov 88 17:34:28 GMT
References: <106@xenlink.UUCP>
Reply-To: mikes@ncoast.UUCP (Mike Squires)
Organization: Cleveland Public Access UN*X, Cleveland, Oh
Lines: 37

In article <106@xenlink.UUCP> deraadt@xenlink.UUCP (Theo A. DeRaadt) writes:
>
>Anyone know what is involved in taking a drive out of an external
>enclosure and replacing it, probably with something a little bit
>bigger? It's a full height 5.25" right? Format software will handle
>it? Any problems to watch out for?

It is my understanding that any ST506 drive with 1024 cylinders or less can
be used.  The faster the seek, the faster the system.  I added two CMI 6640's
to a 15MB external system with no mods (except that I rejumpered the 15MB to
be drive 2 and made one of the 6640's drive 0 - great speed-up).  This worked
until the 6640's died of old age.  The XENIX formatter allows you to input
cylinders, heads, and bad tracks; it is apparently possible to play with 
interleave (I've never done it).  Precomp is fixed and it is possible that
this might be a problem.  I understand that the 70MB is a Micropolis 1325.

I currently run a system with three Quantum 2080's (8" SA1000) off an old
8BM controller with no problems.  If the primary is changed I know that the
write protect stuff has to be faked out (on the 8MB drives that involves
taking a line from the output from the Write Protect switch and connecting
it to line 5 of the 20-pin data cable.  

I also have info on the following other hardware hacks: 12MHz 68000 with 1/0
wait states for the 8MHz board; upgrading 256K boards to 1MB; and extending
the buss to allow using more boards in a II/16.  There was also a recent
posting here on using 5 1/4" 1.2MB drives instead of post48-2's. Finally,
I have a copy of the KA9Q TCP/IP package that runs SL/IP on a 6000 (from
bgun).

"sir-alan" is a 16B+/6000 with 3X 2080 running under XENIX 3.2 (3.0 Dev.
System).  It is a comp.sources.unix archive site.

Mike Squires Allegheny College Meadville, PA 16335 814 724 3360
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