26 Mar
2005
26 Mar
'05
12:11 p.m.
On Sat, 26 Mar 2005, Ethan Dicks wrote:
Are you sure about this? I thought the only
difference between 160K
disks and 180K disks was 8 sectors per track vs 9 sectors per track.
I don't remember an FM/MFM difference (but I could easily be wrong).
Only thing that you are wrong about, is thinking that you might be wrong.
Also, if you are doing this with an older motherboard
(no onboard
floppy controller in particular), it might be easier to be sure
exactly what FDC you are using.
The "real" IBM FDC, and most others with a 765 chip, are hard wired for
MFM, and needs some [minor] modifications to be able to do FM.
Look for a 37C65 chip.
All I can suggest is to focus more on your choice of
FDC and
application software and less on the floppy mechanism itself.
If you suspect DRIVE problems, you could try hanging the drive on the NEC,
and see if it works there.
--
Grumpy Ol' Fred cisin at xenosoft.com