Hitachi KK521
Hitachi KK521
Display is 12 digits, separate green vacuum-fluorescent tubes.
4 functions, memory.
Uses a mixture of large-scale integration (LSI) integrated circuits and smaller ones. Main ICs - Hitachi HD3234P, HD3235P, HD3236P here date coded early 1972.
218 x 254 x 80 mm (8.6" x 10" x 3.2").
~1972.
Made in Japan.
Has a pull-out carrying handle.
Hitachi also produced desk calculators for Singer Friden, see the Singer Friden EC1117.
With the cover removed to show the integrated circuits and the display tubes.
Electronic Desk
Calculators
Vintage Calculators
© Text & photographs copyright Nigel Tout 2000-2023 except where noted otherwise.