Floppy disk: one drive per face

Bill Gunshannon bill.gunshannon at hotmail.com
Thu Nov 5 14:54:01 CST 2020

On 11/5/20 2:31 PM, ben via cctalk wrote:
> On 11/5/2020 12:04 PM, Enrico email.it via cctalk wrote:
>> We are trying to read some floppy disk used on a 1981 Italian Z80 machine
>> with CP / M.
>> The problem is that the firmware selects face A of the floppy as DRIVE 
>> A and
>> face B of the same floppy as Drive B.
>> We saved an image with IMD and we know that the geometry of face A is IBM
>> 3740 26x128x77 tracks.
>> By inserting this data into the 22DISK definition file we can 
>> successfully
>> extract the CP / M files from A side.
>> How should we configure 22disk to be able to do the same thing on the 
>> B side
>> of the same floppy disk?
>> Inserting Side 2 in the definition table is not enough ....
>> Thanks Enrico - Pisa- Italy
> This local guy might know.
> http://www.ummr.altervista.org/
> A good view of computer history, from the land of pasta.
> Ben.

I am not familiar with 22Disk.  Can you image each side as a separate
image?  That should make it possible to read both of them.


More information about the cctalk mailing list