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Vintage 1977 microprocessor/control circuit board marked G11-80139.Features period MOS Technology components including an MPS 6532 RIOT RAM/I/O/Timer IC dated 2377 and an MPS 6503 dated 1777, along with vintage 74-series logic, Beckman ceramic resistor network, DIP switches, discrete transistor circuitry and multiple card-edge connections.A particularly interesting early microprocessor-era board with strong appeal for vintage computing, industrial electronics, restoration, component and technology collectors.Exact original equipment/application has not been confirmed, so it is being described strictly from the markings and components visible on the board.Board shows normal age/storage wear as pictured. Some IC sockets are unpopulated. Untested and sold as-is for restoration, research, display or parts.Please review all photos carefully for exact configuration and condition.
