Casio fx-81
Brief History
One year after the first really cheap scientific calculator has been developed specifically for students, a new model was announced. The white-coloured calculator was cheaper than any other in the market, but it was electronically identical to the earlier fx-80. The only difference was the display, which has an ERROR indicator instead of STAT. Although the statistical labelling has left, the SD mode still exists and can be operated with the same keying as with fx-80.
| Manufacturer: | CASIO Computer Co., Ltd. (Japan) |
| Mfg. date: | 1980-82 |
| Size: | 7,5×14,8×1,9 cm |
| Weight (ready for operate): | n.a. |
| Type: | scientific |
| Capacity: | 8/6+2 digits (input/display) 10+2 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | NEC D1897G |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 6 bracket (with saving the pending operation) 1 memory (with aritmetic) |
| Features: | +/-change sign (direct entry of negative numbers) RVexchange registers (X-Y) Ffloating-point notation Sciscientific (exponential) notation Engengineering notation Sqrsquare root x2square pivalue of pi (3.1415..) can be recalled 1/xreciprocal trigtrigonometrical functions (sin, cos, tan and inverses: arcsin, arccos, arctan) DMS-DDconversion of decimal and sexagesimal numbers logexponential and logarithmical functions (10- and e-base) yxraising to power |
| Display: | 9 digit LCD (EPSON LD-B640) |
| Power: | 2×AA-type battery |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 59.991158 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.0068809E-70 |
fx-81
Inside of the fx-81
Calculators with identical electronics: fx-80, fx-81, fx-82
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