8008?

[Jim Kearney]

From: "Allison" <ajp166 at bellatlantic.net>
> I have an 8008 and HDSP2132 (8 char version).  Wire wrap and a software
> patch will have to do.

Sounds like you're set, then!

> I may not duplicate the design exact;y as you did it.  Rather than memory
> mapped I may implement IO ports.  However looking at your design there
> there some design simplifications that hadn't occured to me last 8008
> project (1974).  It's pretty cool and saves a carload of chips.  Most
> people back then were implementing multiple busses (address, ram data,
> IO in, IO out, interrupt instuction) and thats a lot of chips. The MCS-8

Yes.  The use of supporting components a bit newer than the CPU made this
design possible.  I was able to avoid a bus because the load on the CPU data
pins is much lower than the old banks of 1101's etc;  and having RAM and
EPROM that were slightly faster than the CPU dramatically simplified the
state decoding.  The use of memory-mapped I/O also simplifies the state
decoding a fair bit, too.  A PROM or a PAL could fully decode the state
without too much effort, but I wanted to avoid programmed parts other than
the EPROM.

Jim