18 Sep
2006
18 Sep
'06
3:07 p.m.
On 9/16/2006 at 4:30 PM Allison wrote:
I don't recall there being any custom parts. All standard DIL ICs (VCO,
phase detector circuit, etc). If anyone wants me to check, I have the
card, and I have the techref (I have found times when the IBM card and
the Techref don't agreee :-)).
Ah, it's using the definitive PC FDC. It was
developed well before
PCs standardized. PCs however don't offer much choice and if they did
keep all the FDC features you could put a 8" on a PC and read SSSD!
You could?!? (if I'm parsing your statement correctly). IIRC, the original
PC FDC card had IBM's proprietary data separator on it (several hybrid packagaes) and couldn't read SD/FM to save its
life. It also had the 8272
Rememebr the data rate of 8" SD is the same as that of 5.25" DD. I have
an idea the data separate _will_ lock to 8" SD (which is still 250kbps),
and you can then program the FDC chip to do single density operations. I
have never tried this, though.
(non "A") part, so it had other problems
with "alien" formats.
-tony