Article View: comp.sys.ibm.pc
Article #43733Re: Floppy drive / controller woes
From: Jon Scheer
Date: Fri, 09 Mar 1990 02:09
Date: Fri, 09 Mar 1990 02:09
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1860 bytes
The problem is that your floppy thinks it is connected to an XT, and
it is using pin 34 as a Drive Ready indication. When you hook up a
3.5" floppy to an AT, you want pin 34 to indicate Disk Change.
Look on the logic board on the floppy. There will probably be a
jumper labeled DS/RDY or some such thing. Usually it is three
pins where you jumper the middle and one of the outside pins.
This one had me going for months... (I have a lot of 'war stories'
about hooking up 3.5" drives.)
Like someone else stated, there is another way you can get around this
problem -- sort of. You need to hit ^C at the Dos prompt after changing
disks.
One 3.5" floppy drive that I have doesn't have any jumpers on it.
I get the impression that it was designed for use with an XT. But
I wonder if I can get it to work on an AT if I put a capacitor
in series with pin 34 so the AT would only see pulses... Hmmm...
Something to try this weekend... (Any bets?? :-)
Hope this helps.
Jon
3/8/90
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!motcid!scheer From: scheer@cell.mot.COM (Jon Scheer) Newsgroups: comp.sys.ibm.pc Subject: Re: Floppy drive / controller woes Summary: 3.5" floppy drive promblems. Message-ID: <1572@hazel7.UUCP> Date: 9 Mar 90 02:09:33 GMT References: <2039@aipna.ed.ac.uk> <90065.133116JIW2@psuvm.psu.edu> Organization: Motorola Inc., Cellular Infrastructure Div., Arlington Heights, IL Lines: 34