Back to Olympia OverviewOlympia CD 400 Calculator

Electronics

All logic is constructed with SSI ICs, in this machine date coded from 1970.

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.