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Electronics

Second generation electronics with gate-level SSI ICs and extensive diode-transistor logic.

ICs are Mitsubishi M95xx series, an early Japanese variant of TTL. See Data & Links for further information.

Architecture, Memory & Speed

12 displayed digits using individual Nixie tubes. Negative indicated by a separate lamp.

Construction

General construction is typical of first generation machines with elaborate fabrications, brackets and fasteners.

Keyboard uses reed switches and moving magnets.

Electronics are on two double sided PCBs with an unusual interconnect plug across the width of the boards, near the centre. Therefore, no edge connectors or typical backplane. This arrangement is unhelpful for service as extender boards cannot be used to gain access to the working circuit.