Path: utzoo!news-server.csri.toronto.edu!rutgers!maverick.ksu.ksu.edu!zaphod.mps.ohio-state.edu!usc!apple!veritas!amdcad!brahms!ching
From: ching@brahms.amd.com (Mike Ching)
Newsgroups: comp.sys.ibm.pc.misc
Subject: Re: 720k Drives on AT
Keywords: 720k drives AT
Message-ID: <1991Mar7.035737.5548@amd.com>
Date: 7 Mar 91 03:57:37 GMT
References: <1991Mar5.204203.16929@sbcs.sunysb.edu> <1991Mar6.005244.13069@magnus.ircc.ohio-state.edu>
Sender: usenet@amd.com (NNTP Posting)
Distribution: usa
Organization: Advanced Micro Devices; Sunnyvale, CA
Lines: 22

In article <1991Mar6.005244.13069@magnus.ircc.ohio-state.edu> smsmith@hpuxa.ircc.ohio-state.edu (Stephen M. Smith) writes:
>dhoelzer@csserv2.ic.sunysb.edu (David S Hoelzer) writes:
>>	I've been having a spot of trouble lately.  I have recently come 
>>to possess a 3.5" 720k drive.  I installed it in my AT with a modicum of 
>>trouble.  It works fine, except for one thing..
>>	If I insert a disk and take a directory, no problem.  I then eject
>>this disk and insert another.  I attempt to take a directory and lo, it
>>displays the directory of the disk that I have just ejected!  If any action is

[stuff deleted]

>Now, as to solving the problem, I don't know if it's something as
>simple as a jumper, or if something is wrong mechanically.  Anybody
>got the exact answer?
>

Sounds like pin 34 is connected. My 3.5" drive came with a jumper to connect
pin 34 for XTs and unconnected for ATs. The factory configuration was for an
XT. If there's no jumper, a bit of tape over pin 34 works. Pin 34 is the
disk change signal.

Mike Ching