20 Nov
2001
20 Nov
'01
1:51 a.m.
On Tue, 20 Nov 2001, Richard Erlacher wrote:
From: "Tothwolf"
<tothwolf(a)concentric.net>
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
On Tue, 20 Nov 2001, Richard Erlacher wrote:
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 ... 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 ;)