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

From: Jim Brain <>
Date: Thu, 11 Aug 2011 22:03:11 -0500
Message-ID: <>
On 8/11/2011 8:33 AM, Hoffmann-Vetter, Martin wrote:
> 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?
Yes, I will add a legend for it.
> 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.
Do we know of such a variant?

As well, do we know of a variant with 2332 pin 21 active hi and others 
with pin 21 active lo?

Finally, I suppose I should look at 2316 (did 2308 exist?) if it's used 


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Received on 2011-08-12 04:00:18

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