R-DOS (REX DOS??) on an oceanic 1541 clone drive

From: Julian Perry <jp_at_digitaltapestries.com>
Date: Mon, 6 Oct 2014 22:28:31 +1100
Message-ID: <1704479326.20141006222831@digitaltapestries.com>
I picked up an oceanic 1541 disk drive clone in a recent haul of
Commodore stuff. It's actually branded "EXCELERATOR+PLUS", but it's an
Oceanic drive.
It has a DOS ROM I'm not familiar with, and has the
ID string "73,R-DOS 40 TR. 1541,00,00". Some googling has revealed
that some people have guessed it as "REX DOS" - but I can
find next-to nothing about it. ( I personally doubt it)

The drive itself works, and I've dumped the ROM using drvmon. It boots
up and works fine under VICE, and it can be found at
I plan to poke around in it, and see if I can reverse engineer the
command strings out of it, but that may take a while.

There seems to be a total lack of information about this DOS - in
particular I'm curious about the command strings to utilise the 40
track capability hinted in the ID string.

Does anyone have any info about this ROM?

In an unrelated query - I've been reviving a 1982  KU-14194HB
silver-label machine. It's now working fine (RF modulator was dead) but I'd love a schematic
for the thing, and I've been unable to locate one.  Has anyone seen


       Message was sent through the cbm-hackers mailing list
Received on 2014-10-06 12:00:02

Archive generated by hypermail 2.2.0.