Re: SFD-1001 (8[02]50) diagnostic codes ?

From: Marko Mäkelä (
Date: 1998-05-06 10:30:58

On Wed, 6 May 1998, Martijn van Buul wrote:

> Hmm.. Does anyone have an explanation of the diagnostic codes of the
> SFD-1001 (or 8250 / 8050) ? My SFD-1001 is blinking at me, and I'd like
> to know what it wants :) contains only the 2031
and [2-4]040 schematics, but in /pub/cbm/firmware/drives/old you can find
the SFD-1001 and 8[02]50 firmware.  Disassemble them to find the LED
blinking sequences.  I think that it is the controller ROM and CPU that
does the blinking, so it'd be only 1024 bytes you have to disassemble.

BTW, I got new PET schematics: the SuperPET add-on boards and the new
universal system board.


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