Calculators Marketed by
Sumlock Bondain

Sumlock Bondain 320A

Sumlock Bondain 320A

Sumlock Bondain 320A

The display is 12 digits green VFD (Vacuum-Fluorescent Display).

The calculator is powered by AC.

Main integrated circuit is Hitachi HD38401A, here date-coded 1979.

Four-function, square root, memory.

196 mm x 274 mm x 72 mm (7.7" x 10.8" x 2.8").

Made in Japan.

Inside Sumlock Bondain 320A

With the cover removed showing the simplified electronics of a desktop calculator of the late 1970s.  The VFD display is very prominent with the Hitachi HD38401A calculator integrated circuit below on the left.

Calculators Marketed by
Sumlock Bondain

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Text & photographs copyright © 2002 - 2022 Nigel Tout, except where noted otherwise.