The Model III versions of LDOS, DOSPLUS, MULTIDOS, and
NEWDOS/80 could
all read Model I TRSDOS disks. Model III TRSDOS 1.3 couldn't read them
directly, but it did come with a conversion utility.
Right. I never really used TRS-DOS on my M3. By the time I'd got it, I
was running LDOS on my M1, and anything else was a disapointment :-). So
of course I got LDOS for the M3 as well. And of course had no problems
making disks that could be read on either machine.
Most programs written after the introduction of the Model III worked on
both computers. There were some programs with separate versions, but
Hmmm... Some of the Radio Shack software packages included disks for both
machines, but he programs on them were not quite the same (they were
probably uilt from the same sourve with a few conditionals, but they
weren't the same binaries). And I have a couple of such packages that are
Model 3 only.
-tony