Commodore PET disk drive power-up error codes

From: Dave Dunfield <>
Date: Sun Sep 12 06:21:26 2004

>> [If it is a 2114, it will be the second one I've found dead in PET hardware
>> over the past month - other was was video RAM in a 4032]
>FWIW, I've had _lots_ of 2114s fail. I had to replace all of them in my
>8050 (IIRC, if you hvave multiple RAM errors, you get the flash code for
>the lowest bank first, then when you've replaced those you get the code
>for the next bank, and so on...). I had to replace the video RAMs in my
>TRS-80 Model 3. And the RAM in my HP82163 video interface. And more...
>In my experiece the 2114 is one of the least reliable chips ever...

I've seen a few other ones fail as well - funny, I used a LOT of 2114s in
my early building (at 4 bits each - way less wire-wrapping than 2102s).
Never had any trouble with them at the time, however they do not seem to
age well...

Btw, it is an 8050, and replacing those two chips did fix it. [Naturally,
the one I pulled first was not the defective one]


dave04a (at)    Dave Dunfield
dunfield (dot)  Firmware development services & tools:
com             Vintage computing equipment collector.
Received on Sun Sep 12 2004 - 06:21:26 BST

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