On 3/13/2022 7:57 AM, David Schmidt via cctech wrote:
Good point about the CP/M disk - actually it is read just fine with
cpmtools with this diskdef:
# PRO CP/M RX50 DZ format (Perhaps only 79 tracks should be used?)
diskdef dec_pro
seclen 512
tracks 80
sectrk 10
blocksize 2048
maxdir 128
skew 2
boottrk 2
os 2.2
end
So I'm left with figuring out how to pull files off of 12-bit OS/{2}78
disks.
If you can extract the byte stream from the IMD/IMG files (and
de-interleave them if necessary into logical order), I have tools to
read the OS/8, COS, etc. file-systems.
The tools want essentially a 16 bit short for each 12 bit word, in
logical order. I think this is essentially what you get for the
"inefficient" 12 bit mode. I also have tools to unpack some of the
interlaced 8-bit formats for RX01/RX02, and those tools may be adaptable
to the RX50.
Vince
