4 Feb
2000
4 Feb
'00
5:43 a.m.
--- Pete Turnbull <pete(a)dunnington.u-net.com> wrote:
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
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On Feb 3, 22:53, Glenatacme(a)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.