<signals? I guess it's no wonder people liked the 8085, with its silly muxe
<address bus better than the 8080 . . .
The 8085 had different control signals, didn't require 3 voltages, a clock
chip, a bus control chip, was faster and allowed better memory timing.
<Soooo . . . the signals were named the same also, eh? pSYNC, /pWR, sMEMR,
<etc???
Follow them back to them 8080 it should answer themselves. Also the 8080
muxed status on the data bus at the early part of the cycle so the control
signals reflect the raw 8080 status and control for the most part.
That's why board with 8085 and Z80 had all sorts of screwy logic to take
their mostly decoded controls and encode them.
Allison
Received on Mon Mar 29 1999 - 18:22:05 BST