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From: motteler@umbc4.umbc.edu (Howard E. Motteler)
Newsgroups: comp.sys.3b1,unix-pc.general
Subject: quad density floppies
Summary: need iv and drive info
Keywords: floppy quad density
Message-ID: <5238@umbc3.UMBC.EDU>
Date: 3 Mar 91 06:59:15 GMT
Sender: newspost@umbc3.UMBC.EDU
Reply-To: motteler@umbc4.umbc.edu (Howard E. Motteler)
Organization: University of Maryland Baltimore County
Lines: 21

A while back, Michael G. Beirne writes:
> I use a Mitsubishi 5 1/4 inch 1.2 meg floppy jumpered to fix the
> disk speed and this gives me a 720K 5 1/4 floppy. This way I can
> just reformat my old 360K backup floppies and use them again.

Is this the same (or similar to) as the "quad-density" from way
back in the CP/M days?

I'd be interested in trying this.  How reliable are the 5 1/4's
used this way?  Would it be possible (e.g., with an external
switch) to toggle the drive between regular and half speeds, and
read both sorts of disks?

>Send me mail if you want the jumper
>list for the Mitsubishi drive and an "iv" description file.

Please post this (or mail me the info!)  I suspect a number of
people might want to try it.

Howard E. Motteler       |  Dept. of Computer Science
motteler@umbc3.umbc.edu  |  UMBC, Catonsville, MD 21228