>I'm serious. I really have wanted to build something like this. In terms
>of size, the problem isn't the wiring, it's the redundant circuitry.
Most of the DEC core planes use a fair number of special-purpose
transistor arrays (often specially matched) for drivers as well as pulse
transformers and delay lines. If you look back at alt.sys.pdp8 archives
(or its mailing-list twin, PDP8-LOVERS) you'll find some suggestions
for part substitutions and/or rebuild directions.
I believe that at least one of the electronics rags in the Lasnerian mid-70's
(Radio Electronics? Popular Electronics?) published an article on using
surplus core arrays that were readily available at the time, but the
article was remarkably detail-free when it came to the actual details
of driving and sensing. There were at least a few implementations of
S-100 core memory in the mid-70's, and one of them was a S-100 to
Unibus translator of sorts. (Not to be confused with the IMSAI
S-100/Unibus shared memory module, which is in several of my IMSAI
price lists from 1977/1978 but which I believe to be vaporware.)
--
Tim Shoppa Email: shoppa_at_trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927
Received on Wed Apr 21 1999 - 12:14:05 BST