1771 floppy controller questions

From: Tothwolf <tothwolf_at_concentric.net>
Date: Tue Nov 20 09:51:11 2001

On Tue, 20 Nov 2001, Richard Erlacher wrote:
> From: "Tothwolf" <tothwolf_at_concentric.net>
> > On Tue, 20 Nov 2001, Richard Erlacher wrote:
> >
> > > What is it that makes you believe that the 1771 s the problem?
> >
> > Well, I accidentally plugged the chip in backward when troubleshooting the
> > floppy interface right after I got it. It turned out that the floppy
> > ribbon was bad, just due to age I guess. I don't think the chip let out
> > its magic smoke, but it certainly does not work now ;)
>
> OK ... I can believe you'd reach that conclusion from what you describe. I've
> done that on one of those "late nights" on more than one occasion. It's
> reasonable to assume the part is toast, given that there are several supplies,
> each of which has been applied to the wrong pins. Too bad ...

I'm really not too worried about it, since the 1771 does seem to be
available and I have the technical reference book for the expansion
interface. I don't think there are any unusual or proprietary chips used
in the expansion interface with the exception of the floppy controller. If
it took out any other logic chips with it, I should be able to replace
those easily.

It appears that my local vendor may have just assumed the part he has in
stock is a National, since I can't find any references to National ever
manufacturing a 1771, and the -B01 is a WD suffix.

-Toth
Received on Tue Nov 20 2001 - 09:51:11 GMT