CompuPro floppy controller differences
ard at p850ug1.demon.co.uk
Mon Sep 18 17:07:47 CDT 2006
> On 9/16/2006 at 4:30 PM Allison wrote:
> >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
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 :-)).
> 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.
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