Re: CP/M disks

From: Marko Mäkelä <>
Date: Tue, 6 Jun 2017 18:45:48 +0300
Message-ID: <20170606154548.hlj54xqgbtoxa2lo@hp>
Hi Spiro,

>* On Mon, Jun 05, 2017 at 11:29:31PM +0300 Marko Mäkelä wrote:
>> I implemented support for the Commodore 128 CP/M GCR file system in
>> cbmconvert (June 1999).
>Where can I find documentation abouth the CP/M GCR file system? 
>Somehow, I am not able to find such a thing, although I believe I once 
>had it.

If I remember correctly, I reverse engineered it back then, maybe based 
on some sample disk images and generic documentation of the CP/M file 
system or its spiritual successor, the FAT. I may be mistaken, but it 
could be that only a fixed amount of sectors per track is being used.  
See the function CpmTransTable() in image.c. I must admit that I cannot 
follow it now.  Too bad I did not even use a version control system for 
this piece of software back then.


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Received on 2017-06-06 16:00:02

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