Re: CBM-900 floppy disk format/encoding

From: Groepaz <>
Date: Sun, 23 Oct 2011 15:18:02 +0200
Message-Id: <>
On Sunday 23 October 2011, you wrote:
> Given the fact that I've already tried dumping the disks with an 80
> track drive (HD) - I'm leaning more to my own conclusion which is:
> I need to get hold of a 100 TPI floppy drive and try that with my kryoflux.

i dont know what kind of analysis stuff the kryoflux tools offer - but i can 
tell you that if it is the same format as used with the sfd1001, then you 
should be able to read *some* tracks correctly. the lowlevel encoding is the 
same gcr as found on 1541 (and all other cbm drives). you should be able to 
tell which lowlevel encoding is used by making a histogram of one track 
(again, no idea what the kryoflux tools let you do).

and that said, 100tpi shugart drives seem to be extremely impossible to find 
these days. i'd rather look for a solution to read those disks with a PET or 
something :)


Easy to learn = hard to use, Easy to use = hard to learn, Easy to learn and 
use = won't do what you want it to, Powerful = hard to learn and use, Menu-
driven = easy to learn. 
<Stephen Manes>

       Message was sent through the cbm-hackers mailing list
Received on 2011-10-23 14:00:03

Archive generated by hypermail 2.2.0.