12 May
2006
12 May
'06
7:02 p.m.
Does anyone have a copy of the September 1984 Microsystems handy? I'm
interested in the article about replacing the 8085 on a Compupro dual-CPU
board with an NSC800.
I'm doing a similar project, but am having some real problems. I can read
and execute instructions from EPROM just fine; reads and writes to I/O
devices are just ducky, but DRAM access is unpredictable at best. Logic
analyzer waveforms look textbook, so I'm wondering what I'm missing.
The board does use the Intel 8202 DRAM controller and I know it's a twitchy
part, so I'm wondering if there might be a marginal timing issue.
Cheers,
Chuck