Casio Mini Card fx-48
Brief History
After Casio has announced a credit card-sized calculator (LC-78) in 1978, a whole series of mini calculators were developed. The first credit card-sized scientific calculator, the Casio fx-48 was manufactured from 1978 too. The number of keys didn't increased, so two shift keys were adopted for scientific and statistical functions. The almost unusable model's copy was in production in the Soviet Union at the Angstrem factory (Elektronika B3-38) in the 1980s.
| Manufacturer: | CASIO Computer Co., Ltd. (Japan) |
| Mfg. date: | 1979 |
| Size: | 9×5,5×0,5 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 D897G3 |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 2 bracket (with saving the pending operation) 1 memory (with aritmetic) |
| Features: | +/-change sign (direct entry of negative numbers) Ffloating-point notation Sciscientific (exponential) 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 n!factorial |
| Display: | 9 digit LCD (Optrex AC-40182) |
| Power: | 2×LR41 button cells |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 59.991592 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.0068804E-70 |
fx-48
Inside of the fx-48
Keyboard and display of the fx-48
The original and the copy: fx-48, Elektronika B3-38
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