Dave, all I can say is...
(blush) - thanks for the support Jim, it's good to know this stuff is
Btw - I've been playing around with some Teledisk images that I have which
are "bad" (can't recreate anything looking useful from them), and taking
them apart I've found some interesting things. Most of the problems are
- If TD thinks it sees data on a track thats not a valid sector, it creates
a fake sector to hold it (thats where those mysterious 100, 101 ...
sectors come from) - In some cases, this causes the amount of data to
exceed the track size and cannot be recreated.
- I've found a few images where TD appears to have read tracks twice -
generating a complete duplicated sector list - this is obviously way
too much information for a physical track to contain.
I've added some options to TD02IMD to help strip away some of this extra
data and possibly allow the disks to be recreated - The updated program
is posted (no doubt I will be making further discoveries, so you might
want to check in again in a couple of weeks).
So many half baked ideas get kicked around on the list
about what should
be done, but you just go and do it.
It's been my experience that small jobs can often be completed by one
person with insomnia before a group of people can decide how they would
like to start. Thats just the way it is. Besides, I enjoy working on my
half-baked ideas early in the morning before the daily din kicks in :-)
In a related note, a bit of grumbling....
I've been somewhat disappointed that after posting the TESTFDC program
and a request for list subscribers to help me characterize mainboards
and floppy controllers (about 2 weeks ago), I have received exactly one
submission of information - and even this was taken from an earlier
posting, not by the use of my program, and was incomplete (FDC part
numbers, but no information as to the mainboards or adapters which were
actually tested) - but still very much appreciated.
I've been able to test a few more boards, and added a few additional
entries, however at this rate it will take a very long time before the
resource is even remotely useful ... Although "what do I need to do
single density" is one of the top questions I get asked, I can only
conclude that this particularly half-baked idea is not seen as worthy
of anyone else's effort... So I'm putting it on the back-burner. I'll
leave what information I've collected up on the site and keep the
TESTFDC program in the ImageDisk distribution as it does help people
figure out if their system "can" or "can't".
dave06a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Collector of vintage computing equipment: