Sharp Compet 31 (CS-31A) Desktop Calculator
Sharp Compet 31 (CS-31A)
The Compet 31 (Model CS-31A) was a remake of the earlier
Compet 30 (CS-30A)
utilizing 28 small-scale bipolar integrated circuits to replace
portions of the discrete transistorized logic used in the arithmetic
unit of the Compet 30.
Image Courtesy Takaharu Yoshida
The Compet 31 was Sharp's first calculator to utilize integrated circuit
technology. This calculator marked the beginning of a rapid transition
away from discrete transistorized logic to more reliance on integrated
circuit technology to shrink the size, increase the reliability, and reduce
power consumption of Sharp's calculators.
While the first machine to use integrated circuits, Sharp did not heavily
publicise this machine. Sharp actually gives credit to the
Compet 32 as their first machine
to utilize ICs, in spite of the fact that the Compet 32 actually uses fewer
ICs than the Compet 31. It isn't historically clear why this occurred, but
it could be that there were problems with the Compet 31 that led to
to a very small production run, making the machine historically significant,
but not significant from a market standpoint.
Sharp Compet 31 (CS-31A) Specifications
||Hayakawa Electric Co., Ltd. (Sharp)
||CS-31A (Compet 31)
|Date of Introduction:
||Nixie Tube, 14 Digits
||Small-Scale IC(28) and Diode(1549)-Transistor(553) Logic
|Digits of Capacity:
||Fixed via keyboard pushbuttons
||One memory register
||17 1/4" wide, 18 3/4" deep, 8 1/2" high
|Performance (Manufacturer Claimed):
Copyright ©1997-2011, Rick Bensene.