Gene said: I'm sitting here looking at a 80-103A "copyright DCHayes 1977-1978" S/N 00579 You should invite me over to see your simulator, I can bring the board with me. :) --Doug ========================================= Doug Coward @ home in Poulsbo, WA Analog Computer Online Museum and History Center http://www.best.com/~dcoward/analog =========================================