Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!uunet!pilchuck!apcisea!ssc!fyl
From: fyl@ssc.UUCP (Phil Hughes)
Newsgroups: comp.sys.ibm.pc
Subject: Re: AT vs. 360K drive
Message-ID: <729@ssc.UUCP>
Date: Tue, 18-Aug-87 01:09:31 EDT
Article-I.D.: ssc.729
Posted: Tue Aug 18 01:09:31 1987
Date-Received: Thu, 20-Aug-87 06:25:13 EDT
References: <1918@isis.UUCP>
Organization: SSC, Inc., Seattle, WA
Lines: 22
Summary: Pin 33 is the answer

In article <1918@isis.UUCP>, aburt@isis.UUCP (Andrew Burt) writes:
> I was attempting to put a 360K drive [a Teac] from my Sanyo 555 pseudo-PC-clone
> into my new AT-clone.  The closest I got to getting the AT to recognize it
> was that it would select correctly as drive B:, but any attempts to read
> from the disk gave "not ready error reading drive b"


I got burned by this one too.  In my case, I had added the drive to a
UNIX system on an AT.  UNIX worked fine with the 360K drive but MS-DOS
and the IBM diagnostics didn't.  

The answer turns out to be what to do with pin 33.  Us normal people
expect all the odd pins to be ground but pin 33 is used in the AT to
tell it about 360K drives.  On my drive there was a jumper on the circuit
board that I had to cut.  If yours doesn't have one you should be able
to stick tape over the contact finger so you don't need to butcher the
drive.
Good luck.
-- 
Phil Hughes, SSC, Inc. P.O. Box 55549,       +----------------+
Seattle, WA 98155  (206)FOR-UNIX             | NO CONTRA AID! |
    ...!uw-beaver!tikal!ssc!fyl              +----------------+