Is the disk a SD/DD media or HD (360K or 1.2M)?
Is the drive that you used to make the disk a 360K or 1.2M? Maybe the
thinner 80-track head on a HD drive doesn't make a good enough disk vs
the fatter 40-track head on a SD/DD drive.
Or using a 1.2M drive might be good enough only if the disk is wiped
clean with a bulk eraser (not just erasing/formatting in the drive). To
write a 40-track disk in a 80-track drive, the drive still writes only a
80-track-thin track and double steps and skips over every other track,
basically writing new data interleaved with old junk. Even if you format
& erase first, there is still at least formatting in between your new
tracks that might not line up so exactly that it doesn't blur the
formatting on your actual data track.
When the same 80-track drive reads that disk back, it has an 80-track
head and so does not see the neighboring junk tracks, and you get a
clean read. But when a 40-track drive reads that disk, it has a fatter
40-track head that spans 2 tracks, so it reads junk.
Even with a bulk eraser to make it so that there is nothing at all
between the new tracks, it's still a thin track making a weaker signal
than the old drive is designed for.
If you do have both a 360K disk and a 360k drive, you could try just
cloning your own new working disk and see if that works. Maybe the image
Steve posted isn't 100%. I don't know if anyone has yet claimed to
actually use it to reproduce a disk. Even though you can now make copies
with the DVI, it would be good to have a known working downloadable
image too.
Even you don't have a 360k drive in your dos machine, you DO have a 360k
or 180k drive in your DVI. You could try using that drive in the dos
machine and see how that goes.
--
bkw
On 12/9/24 23:29, Michael Brutman wrote:
Posting a happy ending ...
Brian hooked me up with one of his cables and boot diskettes and
everything is working as it should now.
Apparently my 386-40 running Teledisk 2.16 can't create the DVI disk
image. I was able to make a backup copy of the boot disk directly from
the Tandy/DVI combo so I'm safe for now, but I'd like to understand why
Teledisk didn't work when it should have. The only thing that is
unusual about my system is that I have a Central Point Option Board in
it, but I've never had that cause a problem before. And the first few
sectors were fine as the DVI booted from it; it just couldn't continue
and transfer disk BASIC to the Model 102.
If anybody out there has used Teledisk to create a diskette recently,
what machine type (XT, AT, ?) did you use and what version of Teledisk
did you use?
-Mike
--
bkw
