--- Pete Turnbull <pete_at_dunnington.u-net.com> wrote:
> On Feb 3, 22:53, Glenatacme_at_aol.com wrote:
>
> > Sadly, the WD1770 fcd IC in my home-brew fd i/o board finally gave up the
> > ghost.
> The 1772 was designed to be a plug-in replacement. The main (only?)
> difference is in the programmed step rates.
I am looking at a WDC-1772. It has 28 pins. Doesn't the 1770 have 40 pins?
> > Also, I understand that the C64 floppy drives (1581?) used the 1770 but
> > I'm not a commie and can't immediately verify this.
>
> I'd be surprised if so. I thought all Commodore micros apart from their
> ill-fated PCs used GCR.
The standard 5.25" drives _do_ use GCR for all native formats, but the later
stuff (1570/1571) also do MFM for CP/M compatibility. The aforementioned 1581
is a 3.5" device (~720K; the not-released 1591 was ~1.44Mb) and does have some
form of MFM-capable chip, AFAIK. You can read 1581 disks in other machines,
Linux included, I think.
-ethan
=====
Infinet has been sold. The domain is going away in February.
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Received on Fri Feb 04 2000 - 13:43:37 GMT