RE: Repairing a SFD-1001 (8250/LP, 8050, 4040, 3040, 2040)

From: Hoffmann-Vetter, Martin <>
Date: Thu, 11 Aug 2011 15:33:59 +0200
Message-ID: <005301cc582b$5465fdb0$>
Hallo Jim,

> I spent this evening trying to augment my 2364 design to handle 2332
> and 2364, including 2364 with positive CS.  Comments are appreciated:
> Schematic:

Pin 21 from the 2332 must be used to generate the chip select for the eprom.
Is that the wire to pin 2 of the 84hct86? If yes, this can be work. Only if
the 2332 is programmed with on chip select at pin 21 or non chip select
would be a problem. You can't disable the use of the chip select from pin
20, you can only programm the polarity. You need the jumper SJ3 for output
enable (pin 22) of the eprom, too.



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Received on 2011-08-11 14:00:20

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