9 Apr
2018
9 Apr
'18
4:14 a.m.
On Sun, 8 Apr 2018, Bill Gunshannon via cctalk wrote:
I have no idea of the format.? I got the images and
rawrite.exe and
told the computer to make them.? They were unusable when I used
a USB External floppy but worked fine when I used a real internal
floppy.
I need to get the systems running before I start playing with reading
and writing weird formats.? But that is coming.
As a side note, I did get the system to boot and run from my floppy
emulator with a USB stick.? Have to boot twice.? First time you get
the unrecognized format error second time boots fine.? Interesting.
Good to know for when I am testing on other systems as well.
Small steps, but advancing, just the same.
bill
I seem to recall using a USB floppy drive to make P112 disks, but I also
did it using a Linux machine with the dd command. The rawrite.exe program
is very old and I suspect it and modern Windows systems don't see
eye-to-eye anymore.
The format is described in the cpmtools diskdefs file. Below are the
entries that seem most relevant to the P112.
diskdef p112
seclen 512
tracks 160
sectrk 18
blocksize 2048
maxdir 256
skew 1
boottrk 2
os 3
end
diskdef p112-old
seclen 512
tracks 160
sectrk 18
blocksize 2048
maxdir 128
skew 1
boottrk 1
os 3
end
diskdef gide-cfa
seclen 512
tracks 1000
sectrk 16
blocksize 4096
maxdir 1024
skew 0
boottrk 2
os 3
end
diskdef gide-cfb
seclen 512
tracks 1000
sectrk 16
blocksize 4096
maxdir 1024
skew 0
boottrk 0
# Start of second partition
offset 1000trk
os 3
end
--
David Griffith
dave at 661.org
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