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1990-09-19
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Number: A2TH081590U334
Subject: Running NE2000 Cards in NEC Machines - DMA Failure
Date: September 18, 1990
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GENERAL
INFORMATION: Problems have been reported running NE2000 cards in NEC
machines and getting a DMA failure. Two problems existed.
First was the revision of the NE2000 itself. The cards were
changed so that all cards were the same revision and had the
same static RAM chips which helped, but did not solve the
problem.
The second part was that NEC machines, when multiple LAN
cards are present, cause BUS noise that will cause cards to
fail unless the cards have a chip to filter the noise out.
The options in this case were to swap the brand of card or
to swap machines. The servers were changed from NEC to
Austin (7 servers) and the problems went away. This may not
be the only brand of server that causes this type of
problem.
(X) This information was verified verbally.