Ideas for a simple, but somewhat extendable computer bus
jnc at mercury.lcs.mit.edu
Mon Nov 20 14:09:49 CST 2017
> From: Allison
>> I would seriously consider shared data/address lines, like on the QBUS.
> QBUS is wrapped around a subset of PDP11 and the unique processors made
> to fit it.
I did say "like ... the QBUS", not "the QBUS"! I was just trying to make the
point that the original sketch assumed separate address and data lines, and
that's an assumption worth looking at.
> The bottom line is for every bus you have to get on and off with
> devices to buffer ... The more you use the less card there is for other
Yes, but that cuts both ways: multiplexed address and data also saves you a
lot of bus transceivers.
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