25 Nov
1998
25 Nov
'98
2:44 p.m.
< This might be a bit of an odd question, but can anyone point me in the
< right direction to find info on theory of operation of a front panel?
< have a z80 based computer which I built a few years ago (wire-wrapped)
< which uses an eprom for program storage. I would like to add a front
< panel (switches and lights) to it to get better aquainted with the old w
Find a copy of bursky's book The S100 Bus Handbook.
Front pannels don't work with Z80s if... DRAM depends on the z80 for
refresh. Reason is the stopped state is a very long wait state.
theory wise it's farly simple but there are a lot of repeated circuits
as you have to buffer everything and do some work centered around the CPU
timing.
Allison