20 Nov
2017
20 Nov
'17
12:09 p.m.
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
things
Yes, but that cuts both ways: multiplexed address and data also saves you a
lot of bus transceivers.
Noel