RE: CBM-900 floppy disk format/encoding

From: Hoffmann-Vetter, Martin <>
Date: Sun, 25 Dec 2011 23:17:37 +0100
Message-ID: <00d601ccc353$0353b0a0$>

>> Additional info: I did have time to fire up a CBM-8296 and CBM-8250
>> drive - both in working contition. Couldn't read any dir from the
>> CBM-900 disks with the CBM-8296. From the start I didn't expect the
>> CBM-900 disks to be CBM-DOS GCR format. The CBM-8250 returned DOS
>> error code 23 (checksum error in data block) stating that the right
>> track/sector have been read into memory but that the checksum on the
>> data is wrong. Right now I don't really know what to conclude from
>> this...
> this is really interesting, it actually hints on that the disk uses
> GCR, and also a very similar format. (else you should get "sync not
> found" or something like that). infact you should be very close,
> since syncing and also sector headers are working :)

What is if the format for the CBM-900 ist expanded in the block size to 512
bytes? The checksum calculation must failed! Does anyone know the mostly
used block size of the coherent system?


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Received on 2011-12-25 23:00:12

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