> From: Allison
> simple 16 data, 24 address likely 6 lines for basic control plus others
> your up to 50+ lines
I would seriously consider shared data/address lines, like on the QBUS. It
doesn't add _that_ much complexity to share the lines (I did a slave device
using only 74xxx parts, and it was dead simple - probably a goal of the
designers), and it will really drop the pin count. The speed impact is not
too bad - on reads, where the address and data naturally happen at different
times, it can be none.
Noel
