Unknown S100 system
cclist at sydex.com
Fri Sep 21 15:01:05 CDT 2007
On 21 Sep 2007 at 14:07, Roy J. Tellason wrote:
> I wonder why they went with that part? I seem to remember some others that
> used it as well, though specifics are not coming to mind at the moment. I
> have a bunch of those on hand, and think about doing something with them
> from time to time. It's a fairly easy chip to use, with an eprom and a ram
> chip and a single address latch, I just haven't decided yet what I'm gonna
> do with it.
Compupro 85/88 board; my own Durango F-85 and a host of others. If
you can find some of the support chips (8155, 8755), the parts count
can be very low, given the vintage of the 8085.
I suspect that the reason 8088/8085 pairs were fairly common in
comparison to Z80/8088 pairs was that timings and buses on the 8088
and 8085 are *very* similar and getting them to work with 8000-series
peripherals was very easy. IIRC, one could even replace an 8085 with
an 8088 (assuming you were restricting it to 64K addressing) with a
minimum of "glue". Both multiplex the data lines on A0-A7 the same
I suspect it might be easier to substitute an NSC800 for an 8085 if
Z80 functionality is needed than trying to shoehorn in a Z80.
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