On Fri, 27 Dec 2013, Tony Duell wrote:
Anyway, from what I rememebr (and it's several
years sicne I fired up the
Model 1), the LDOS disk format is pretty compatible between the M1 and
M3. An M3 vcan write an LDOS disk that will be correctly read on the M1.
That can be read by LDOS running on the model 1.
NOT readable by TRS-DOS running on the model 1.
But, then LDOS running on the model 1 could probably read that disk and
create a TRS-DOS compatible disk.
NOTHING running on the model 3 could produce a disk that was readable by
model 1 TRS-DOS running on the model 1.
It would not have taken much to write a trivial program that could run on
model 1, that could read track from the pseudo-model-1 disk, reformat the
track and write it back out.
Running that trivial utility would require running some other OS on the
model 1, OR getting that utility onto a model 1 TRS-DOS diskette (which
would require assembly it on model 1 TRS-DOS, or running some other OS on
the model 1 to get it onto a model-1 TRS-DOS compatible disk)
Remember Boraon Von Munchausen's role in the word "bootstrap"!
Of course, being 3 decades ago, with inadequately refreshed
dynamic wetware, MANY people who had the sense to switch over and run
LDOS/NEWDOS/DOSPLUS, etc. on their model 1s will have faulty memories of
thinking that they were still running model 1 TRS-DOS and "But, I did it
all the time!".
Besides the TRS-DOS derivatives, the model 1 also had MicroDOS (from
Micropolis), and CP/M (FMG relocated, OR Omicron,Parasitic, etc. memory
remapping hardware)
--
Grumpy Ol' Fred cisin at
xenosoft.com
http://www.xenosoft.com/FPUIB