Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!zaphod.mps.ohio-state.edu!math.lsa.umich.edu!sharkey!cfctech!ttardis!rlw
From: rlw@ttardis.UUCP (Ron Wilson)
Newsgroups: comp.sys.apple
Subject: Re: 5.25 floppy disk formats
Message-ID: <2403@ttardis.UUCP>
Date: 1 Jan 90 05:17:57 GMT
Organization: Gallifrey
Lines: 14

In article <8520.infoapple.net@pro-generic>, sb@pro-generic.cts.com (Stephen Brown) writes:
>In-Reply-To: message from ericmcg@pro-generic.cts.com
>
>I think the problem with getting a 5.25 running double density would be more
>than just the heads being too big. You'd have to double the clock rate, and then the
>bit cells would be too small (especially at the outer edge of the disk where
>the rotational velocity is the greatest).  Of course, it might be an
>interesting hardware experiment with a IBM drive and a modified Disk II
>controller to see if you could get it working on high density disks.

The Apple Disk ][ is a "standard" mechanism with a "proprietary" circuit
board.  In theory, a Disk ][ circuit board could be connected to a high
density mechanism, provided the new mechanism's head and stepper connections
are compatable.