That was the end of my successes.
testfdc sees the drive, but only 300kB DD seems to work. I tried making
an image with the 1.2MB drive, but every sector said write error: no
data, so I gave up.
Then, I took a working Kaypro drive and put it in the PC, and tried
testfdc. I overrode it as 360kb 5.25 drive, and testfdc finds the
drive, but it immediately gives up stating "!No FDC Interrupt"
So, if there is "a way to do it...", it continues to elude me.
An assortment of notes:
You need to boot to real/raw DOS ... IMD doesn't work under windows.
If you are booting from a floppy, know that IMD reconfigures the controller
rendering it inaccessable by DOS while IMD is accessing the disk - so
it can't read/write the image file from/to a different floppy. I have a boot disk
image on my site that boots and runs from a RAMdisk and contains network
tools to transfer the image off (or you can ZIP it to a floppy after IMD is
finished).
If you are booting to real/raw DOS ... does the drive work under DOS.?
Can you FORMAT 1.2M and 360k disks under DOS and read/write
them.? If not, you have a hardware problem (for DOS, make sure it is
configured correctly in BIOS - IMD doesn't use BIOS settings though).
Make sure you are using DD media, and NOT HD media - for 5.25"
diskettes, DD media usually has a reenforcing ring around the edge
of the center hole, and HD diskettes usually do not have it
1.2M drive spins at 360rpm ... DD drive spins at 300rpm ... my Keypro
disks were read on a real DD drive, so they are encoded at 250kbps.
If you write them to a 1.2M spinning at 360rpm, you need to set a speed
translate 250->300 in order for the density to come out right. My docs
and help contain more details on this.
I assume It goes without saying, but to use 1 2M drive, you need an
AT or later style controller capable of handing HD drives. If you use a
DD only controller, you need to tell IMD this - there's a command line
option - note that this would only work on DD drives (obviously).
I've had issues with 300kbps on certain controllers - mostly with single-
desnity (IIRC k4 disks don't use SD) --- I've got info on my site on
modifying 1.2M drive to run at 300rpm/250kbps which may work better
for you.
Also IIRC, some of my kay disks have an extra SD track-40 (41), which
existed on the original disks ... I doubt it's required, but I left the images
exactly as read when I posted them - if your setup only fails on track-40,
try the disks as they will probably work anyway.
1.2M drive is a 96tpi drive. Kaypro disks are for 48tpi drives - you will
need to set double-stepping when recreating the disks -- otherwise
you won't be able to read them in the 48tpi DD drive.
96tpi drives (like your 1.2M) lay down thinner tracks than 48tpi drives
(regular DD drives) - you may have issues reading disks that were
written on 48tpi, then re-written on 96tpi, then read on 48tpi ... note
that most of the time it works for me, and it would not be the cause of
errors writing and reading on the 96tpi drive ... only reading them on
the 48tpi after rewriting them on 96tpi ... you can bulk erase the disk
prior to creating it in the 96tpi drive if this is causing you grief.
If none of the above help, get back to me with exactly what your hardware
setup is, what media you are using, what speed your drive is running
(There's a test-RPM command in IMD) - and I'll try to come up with some
more suggestions.
Dave
PS: Regarding using TM-100 in PC ... I believe I have gotten one to work,
but I find more "modern" 1/2 height DD drives much easier to work with on
a PC - PC expects drive to be jumpered as drive 2 (or 1 if counting from
zero) and has issues with signals due to it's "rolled cable". IRC you need
to
jumper the drive (or connector) to provide motor-on with select - it's been
quite a while since I worked with one of these drives on a PC.
PPS: I've got about 2 dozen "nearly new" Teac 1/2 height DD drives in
a box in my basement - If anyone needs one, get in touch with me and
we can work something out.
--
dave13 (at) Dave Dunfield
dunfield System/Firmware development services:
www.dunfield.com
(dot) com Classic computers:
http://www.classiccmp.org/dunfield