This had a couple of S-100 incarnations, one by an
outfit known
as Mini-Micro-Mart. In the 1975 timeframe when you had a few K
of memory in a S-100 system it made at least a little sense.
Later extrapolations used a AMD 9511/9512 chip, as in the
Compupro System Support, and boards by TDL and Northstar. That
was a very expensive chip whenever I saw it for sale :-).
Tim.
Didn't Marinchip make one as well?
Peter Wallace