[Coco] Floppy Controller chips

[Gene Heskett]

On Monday 22 July 2013 19:43:54 Arthur Flexser did opine:

> 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

True, but then what do you do with the other 12 pins?

> 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-controlle
> > > r-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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> > > 
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> > 
> > Cheers, Gene
> > --
> > 
> > "There are four boxes to be used in defense of liberty:
> >  soap, ballot, jury, and ammo. Please use in that order."
> > 
> > -Ed Howdershelt (Author)
> > My web page: <http://coyoteden.dyndns-free.com:85/gene> is up!
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> > No directory.
> > A pen in the hand of this president is far more
> > dangerous than 200 million guns in the hands of
> > 
> >          law-abiding citizens.
> > 
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Cheers, Gene
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page: <http://coyoteden.dyndns-free.com:85/gene> is up!
My views 
<http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml>
But what can you do with it?  -- ubiquitous cry from Linux-user partner.
(Submitted by Andy Pearce, ajp at hpopd.pwd.hp.com)
A pen in the hand of this president is far more
dangerous than 200 million guns in the hands of
         law-abiding citizens.