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Additional Pictures
This calfax 800CD was manufactured
in October 1973 in Hong Kong. |
The calfax 800CD is
powered by a disposable 9-Volt battery. |
The
calfax 800CD calculator with the rearside of its housing removed. |
The
calfax 800CD calculator with its housing completely
removed. |
| The Main printed circuit
board
(PCB) of the calfax 800CD is centered around a General Instrument CZ-550 single-chip calculator circuit.  |
The
keyboard module of the calfax 800CD calculator.  |
Close-up view of the
General Instrument CZ-550 single-chip calculator circuit. |
Close-up view of the
backside of the unknown 3-digit LED Display Modules. |
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, August 3, 2025. No reprints without written permission.