16 Jun
2008
16 Jun
'08
6:53 p.m.
Roy J. Tellason wrote:
I'm thinking about building a z80 board, with
varying amounts of "stuff"
attached, with RAM and ROM that may be NMOS or CMOS, and some indeterminate
number of Z80-family and compatible peripheral chips.
My question is this: At what point do you _need_ to have address and data bus
buffer chips?
Read the $%#! manual to put it bluntly. A simple guess is once your
design is larger than a small card, you need I/O buffering. I think
a 6800 cpu can drive about 150 pf and a typical load is 10 pf at
rated speeds.