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Olympia CD 400
Electronics
Olympia CD 400
All logic is constructed with SSI ICs, in this machine date coded from 1970. It is interesting to see a combination of US and Japanese ICs, suggesting that Japanese silicon fabrication was maturing at about this time.
- Philco 9900 series DTL
- 9936 Hex Inverter
- 9946 Quad 2-input NAND
- 9962 Quad 3-input NAND
- 9930, 9932 Dual Expandable 4-input NAND
- 9093 Dual J-K Flipflop
- Matsushita 1800 series
- These are likely to be Matsushita’s own DTL, no data has been found to date
Architecture, Memory & Speed
- 12 display digit Nixie tubes and sign indicator lamp.
- Digit encoding and processing to be determined.
- Delay line memory also by Matsushita, 266.66ms total delay.
- Master clock, memory time and full-number time to be determined.
Construction
Calculator logic is built on three double-sided PCBs.
A fourth board holds the display, display decoders/drivers and the main clock oscillator.
Keyboard is reed switch.
Power supply uses series pass regulation for main logic levels.
Construction values remain high with a diecast chassis for the electronics and careful lead dress but construction is generally more economical than first-generation machines.