Rebirth of IMSAI - test-drb@ccmp.vtda.org

28 Mar 1999

GAWD!  The 8080 data sheet!  I wonder if my archives go back that far . . .

I know the signals are modeled after the 8080, but are they all 8080
signals?  I guess it's no wonder people liked the 8085, with its silly muxed
address bus better than the 8080 . . .

Soooo . . . the signals were named the same also, eh?  pSYNC, /pWR, sMEMR,
etc???

Is there a web site which has details on the 8080=>'696 standard decision
tree?

Dick

-----Original Message-----
From: Allison J Parent &lt;allisonp(a)world.std.com&gt;
To: Discussion re-collecting of classic computers
&lt;classiccmp(a)u.washington.edu&gt;
Date: Sunday, March 28, 1999 8:12 PM
Subject: Re: Rebirth of IMSAI

...
 <I've been after the original spec's for the
IMSAI pre-1977 bus timing, etc
<in case anyone has that data in shareable form.

Read the 8080 data sheet for the part running a 2mhz clock... the rest is
obvious to the point of painful.

<I've found the schematic for my IMSAI PIO-6 board but only half the manual
<fortunately with the schematic, of the PIO-4.  I don't seem to have any bu
<timing informtion, though.

Thre wasn't any bus timing info published.  The S100 bus was based on
the raw 8080 timing.  All the bus was is the buffered 8080 signals plus a
few handy ones.  A quick look at the processor board is everything.

Allison