Casio fx-2500
Brief History
In 1977, Casio made up for the shortcomings of the first scientific pocket calculators equipped with liquid crystal display (fx-1000, fx-2000) with the fx-3000, which has a 10 (8+2) digit display, coordinate conversion and combinatoric functions. To compensate the lack of precedence of algebraic operations, it can handle two sets of parentheses, but no longer can calculate with ordinary fractions. The little brother of this model appeared with the designation fx-2500 for a wider audience: it had an 8 (6+2) digit display, but it misses hyperbolic, coordinate conversion, and combinatoric functions. Considering competing products in that category, it was still a good choice, on the one hand, due to its low price, and on the other hand, due to its higher accuracy (by one digit comparing to others).
The fx-2500 was modernized two years later: in the fx-330, the D897 circuit made by NEC was replaced by the new D1897, which already take care of the correct sequence of operations, and also had a set of six-level bracket registers, as well as coordinate conversion functions, which became standard. In terms of appearance, a striking change is the display, which has gray filter replacing the yellow one used by earlier liquid crystal displays.
The OEM version of the fx-330 appeared on the shelves of the Boots drugstore chain in Great Britain with model number Boots 636.
| Manufacturer: | CASIO Computer Co., Ltd. (Japan) |
| Mfg. date: | 1978-79 |
| Size: | 7×12,4×1 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 D897G |
| 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) RVexchange registers (X-Y) 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 (Epson LD-342A) |
| Power: | 2×LR44 button cell |
| 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-2500
Inside of the fx-2500
fx-2500, fx-330 and its OEM variant (Boots 636)
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