Matrix might have been a maker of VME CPU boards, but video board maker from
Montreal was named Matrox and they are still in existence, web address is:
http://www.matrox.com/ .
You might want to try VITA's web site:
http://www.vita.com/jun96vj/toc.html
for some information on Matrix' CPU boards; VITA is VME maker's association
and they might have information on legacy products. Additionally, you can
try search on Google for all three words: "matrix cpu vme".
Regards
Miroslav Pokorni