Floppies was Re: E-Mail-Adress
cclist at sydex.com
Thu Feb 21 21:55:31 CST 2008
On 21 Feb 2008 at 22:30, Dave Dunfield wrote:
> I do have a preliminary utility I wrote to extract CP/M files from ImageDisk
> CP/M images - Worked very well for me in extracting some CDOS files, however
> I didn't get much interest in it so I never bothered to expand it into a
> general purpose utility - it is configurable however - I can make it available
> if you want to play with it. You will need to figure out the right parameters
> for Bigboard disks (the tables for Chucks 22disk might be helpful).
I do have a version of ctod that works from "straight" image files of
floppies (i.e., the sectors appear in consecutive order (no physical
interleave) and in side-to-side ordering. It works for my purposes
(mostly reading images formed from Catweasel maps), but might not
with all formats.
The world of CP/M diskettes is far more complex than simple 22Disk
can manage. There's a special version that I sell where we have to
program the sector mapping algorithm--there are formats that employ
logical cylinder- and side-skewing as well as starting at a central
cylinder and working outwards using alternate traks on either side of
the directory. One or two formats use differently-sized sectors on
each track. This isn't even counting the differing recording
methods, such as GCR or zoned sector packing.
The imagination of CP/M CBIOS authors never ceases to surprise me.
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