Casio 121K
Casio 121K
Display is 12 Nixie type tubes.
4-function.
Semiconductors - Fairchild LSI ICs SL-35021, SL-35022, SL-35023, SL-35024, date coded to the beginning of 1971, & 21 MSI ICs on 2 boards 10" x 5 1/2".
250 mm wide, 290 mm deep, 80 mm high (10" x 11.5" x 3.5"), 2 1/2 Kg (5.5 lbs.).
Made in Japan.
Similar electronics to the Casio AS-C but a completely different looking calculator.
Casio have always been at the forefront of the development of electronic calculators.
Fairchild, one of the giants of the semiconductor world at this time, were only briefly involved with
calculator integrated circuits.
The 4 large ICs among a scattering of small ones illustrates the growing takeover of the electronic functions by Large Scale Integrated-Circuits (LSI) at this time.
