26 Dec
2013
26 Dec
'13
1:21 a.m.
On Tue, 24 Dec 2013, Fred Cisin wrote:
A long shot:
Some BIOS's INT13h, when using 250K, and
particularly 300K, data transfer
rate will AUTOMATICALLY enable double stepping.
I'll file that one away. Thanks for the heads-up!
Turns out the image is indeed 80-cylinder DS. I was able to write a
working diskette on a 1.2M HD drive from within the xtrs emulator (you can
assign physical drives to the emulated machine - nice feature). Still to
be determined is why the ImageDisk conversion fails.
When I read the working disk with IMD, it complains about "deleted data
marker" on track 39 but continues to read all 80 cylinders. That is
probably what's throwing the DMK2IMD tool for a loop. It has a couple of
switches that seem pertinent and I'll give that a try tomorrow. Would be
nice to understand in case this comes up again.
Steve
--