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

From: Hoffmann-Vetter, Martin <>
Date: Thu, 11 Aug 2011 18:33:04 +0200
Message-ID: <007701cc5844$58dc1320$1b09a8c0@mhvnb10>

> Or you use a 139 (open collector) with a pullup resistor.

That's wrong, 139 isn't an open collector. It must be a 156! Or you use a
153, put the jumper with pullup resistors on the input and connect the
output to the chip select from the eprom.



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Received on 2011-08-11 17:00:21

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