I stumbled on this on ebay: https://www.ebay.com/itm/Bell-Laboratories-MAC-8-Processor-Tutor-1977-vintage-/202558325147 Thought someone here might be interested. I have no affiliation. Will "He may look dumb but that's just a disguise." -- Charlie Daniels "The names of global variables should start with // " -- https://isocpp.org