[Coco] Floppy Controller chips

Arthur Flexser flexser at fiu.edu
Mon Jul 22 19:37:52 EDT 2013


Well, the 8877A is a 40-pin chip, and is described by Robert Brose in his
instructions for modifying a CoCo controller to read HD floppies, as a
drop-in replacement for the WD1793.

But it requires only 5V, not 12V, which I believe should make it compatible
with the WD1773 as well, no?

Art


On Mon, Jul 22, 2013 at 7:31 PM, Gene Heskett <gheskett at wdtv.com> wrote:

> On Monday 22 July 2013 19:29:14 Arthur Flexser did opine:
>
> > I seem to recall that the Fujitsu MB8877A disk controller chip was at
> > least more or less compatible with the WD ones used in the CoCo, though
> > I think there were some minor differences.  I know I used one for a
> > while, though I don't remember what model controller I had at the time.
> >
> > A quick google found a place that has used pulls for $12.50:
> >
> > http://usedicchips.com/product/fujitsu-mb8877a-floppy-disk-controller-40
> > -pin-socket-pull/
> >
> > Art
>
> Not a lot of use, I have a controller with the fujitsu chip in it, but its
> a 2793, the 2773 is a 28 pin chip IIRC.  Software compatible, but not 100%
> hardware.
>
> >
> > On Mon, Jul 22, 2013 at 6:20 PM, Bruce W. Calkins
> > <brucewcalkins at charter.net
> >
> > > wrote:
> > >
> > > Supplies for those were pretty much dried up 15-20 years ago.
> > > Bruce W.
> > > =====================
> > >
> > > ----- Original Message ----- From: "Brian Goers"
> > >
> > >  Are Floppy Controller Chips (WD1773) available? Or a suitable
> > >  replacement?
> > >
> > >> It's for a second controller that I have. Mine is still working.
> > >> Thanks
> > >>
> > >> --
> > >>
> > >>  Brian Goers
> > >
> > > --
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> > > net/mailman/listinfo/coco>
> >
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>
> Cheers, Gene
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