Casio College fx-80
Brief History
The calculator market has been flooded in the second half of 1970s, but the scientific models still had future. Casio was well-known for cheap but high quality calculators was developed a special model - College fx-8 - for students in 1977. But the real breakthrough has came only in 1979, when cheaper LCD display modules became available. Not to make impossible selling more expensive scientific calculators, Casio limited this model to functions only widely used in schools, and had only 8-digit display capacity. For the next years, developing has been boosted, and some advanced model was announced.
| Manufacturer: | CASIO Computer Co., Ltd. (Japan) |
| Mfg. date: | 1979-82 |
| 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 SDone variable statistics: calculating mean and standard deviation P-Rconverting coordinates between rectangular and polar systems n!factorial |
| Display: | 9 digit LCD (EPSON LD-601) |
| 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-80
Inside of the fx-80
Calculators with identical electronics: fx-80, fx-81, fx-82
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