DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Additional Pictures
| This
Brother PROCAL 408AY (Version 1)
was
manufactured in Japan in December 1973.
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| The Brother PROCAL 408AY (Version 1) calculator is
powered by 4 AA-size batteries.
|
The inside view
of the PROCAL 408AY calculator with its upper housing part removed. |
| The printed circuit board (PCB) of the
PROCAL 408AY calculator is centered around a NEC µPD273 single-chip calculator circuit.  |
Close-up view
of the NEC µPD273 single-chip calculator circuit. |
The Display PCB of the PROCAL 408AY
calculator with the ISE Electronics DP90A VFD.  |
Close-up view of parts from the
capacitive keyboard assembly. |
Close-up view of the "Mystery"
keyboard interface circuit.
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If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, April 18, 2025. No reprints without written permission.
