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From: enchant@oliveb.UUCP (Dan Crocker)
Newsgroups: comp.sys.ibm.pc
Subject: Re: AT vs. 360K drive
Message-ID: <3136@oliveb.UUCP>
Date: Thu, 13-Aug-87 20:25:46 EDT
Article-I.D.: oliveb.3136
Posted: Thu Aug 13 20:25:46 1987
Date-Received: Sat, 15-Aug-87 12:01:45 EDT
References: <1918@isis.UUCP>
Organization: Olivetti ATC; Cupertino, Ca
Lines: 34
Summary: drive-ready

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 could "cd b:" [or

I fixed exactly this problem by doing the following:
Cut pin 34 on the edge connector of the 360k floppy (I know this probably
makes you nervous).

I'll bet you have a Western Digital WD1003-WA2 controller, right?
Anyway, the reason for this is that pin 34 has different meanings on the
360k and 1.2mb floppies.  On the 360k, it is the drive ready line and on
the 1.2mb it is the disk change line (it means that the diskette has been
removed from the drive).  The system uses this signal to decide whether or
not it needs to check the capacity of the diskette in the drive (360 or 1.2)
The problem comes when you connect the 360k drive.  The controller interprets 
pin 34 as a diskette change line (obviously a dumb thing to do) and, since it 
is always true (the drive is ready), dos gets confused and reports a
drive not ready error (its really not that kind of error).

If you don't want to cut this line at first, you can just put a piece of
tape over the pin so that it doesn't make contact.  Also, some drives have
a jumper that allows you to disconnect this pin from the interface.  You
can look for that too.

Hope this helps.

				dan
-- 
Here comes the supernatural anesthetist
If he wants you to snuff it
All he has to do is puff it
He's such a fine dancer