Re: UniDOS file copier

[CUTjblakeney@sympatico.ca (Jeff Blakeney)]

On Thu, 25 Apr 2002 15:26:59 -0400, "Charlie"
<charlied@NOSPAMbboard.com> wrote:

>There was another OS written by Bob Sander-Cederlof (author of the S-C
>Assembler) that worked on 3.5 inch disks. It used a patched FID for file
>copying, but (and here my memory may be failing me) I think he used Drive 1
>to access the first 400k and Drive 2 to access the second 400k.  UniDOS uses
>Drive 1 for the first 400k and Drive 3 for the second 400k on an 800k disk.
>Drive 2 and Drive 4 seem to be active but unused in an 800k disk.

I remember trying that DOS at some point as well.  Drive 2 and drive 4
were set up as the two 400K "partitions" on a second 3.5" drive if you
had two 3.5" drives hooked up.

I didn't much like that way of dealing with it at the time as I only
had a single 3.5" drive and most software wouldn't let you put 3 or 4
in as drive numbers.

Just off the top of my head I can think of 3 DOS 3.3 clones that I
believe allowed using 3.5" disks as multiple 400K drives:  UniDOS,
AmDOS and OzDOS.  I never really used any of them, just tried them
out.

-- 
 Jeff Blakeney - Dean of the Apple II University in the
                 Apple II Community on Syndicomm.com
 CUT the obvious from my address if you want to e-mail me