11 Feb
2006
11 Feb
'06
1:26 p.m.
Tony Duell wrote:
For some reason, the data lines on slot 8 are wired to
the other side of
a bus buffer chip to the data lines on the other 7 slots. A card in slot
8, therefore, has to assert a special signal on the ISA connector to
enable this buffer -- my memory says it's that it must pull pin B8 low
during a read access to any device on that card.
Thanks to everyone for the information! I was *not* expecting that slot
8 really was special, but empirical evidence was telling me otherwise.
--
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
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