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From: gah@hood.hood.caltech.edu (Glen Herrmannsfeldt)
Newsgroups: comp.os.msdos.misc
Subject: Re: Quad density support?
Message-ID: <gah.668686484@valine>
Date: 11 Mar 91 10:14:44 GMT
References: <1991Mar7.202121.29382@cbnews.att.com>
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Organization: California Institute of Technology, Pasadena
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720k format is supported as of 3.2, I believe, but it is
supported as a 3.5 inch format.  If you have a 720k 5.25inch
drive, connect it up, tell it it is a 3.5inch drive, and it
will work.  That is, if your BIOS supports it.

I used to do this, until I got a 3.5 inch drive.  It works fine.
Also, some DOS machines actually come this way, but very few.