21 Feb
2008
21 Feb
'08
7:55 p.m.
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.
Cheers,
Chuck