Ricoh Ricomac X-2
Brief History
As a well-known office machine manufacturer, the Japanese company Ricoh also offered pocket calculators; some of them were made in their own factory, while others were manufactured in OEM construction by Omron, or later by Systek. In order to offer a wider range of products than its competitors, Ricoh also launched scientific calculators. Since there was no Japanese chip on the market, they used an American company, Rockwell’s integrated circuits in the X series machines. The first commercially available scientific calculator circuit, the Rockwell A4001, was used in X-10, which still made with LED display, and in the later X-1 — and the identical X-11S. That, and the later X-2, which used the improved A4802 chip, were manufactured with a Japanese-made VFD tube. The machines with unusual and weird design with very distinctive colors and shapes are of good quality and reliable, but were only sold on the Japanese domestic market. The production of pocket calculators that could not be produced economically was discontinued in 1976.
| Manufacturer: | Ricoh Company, Ltd. (Japan) |
| Mfg. date: | 1975 |
| Size: | 8,6×15,3×3,5 cm |
| Weight (ready for operate): | n.a. |
| Type: | scientific |
| Capacity: | 8/8+2 digits (input/display) 8+2 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | Rockwell A4802 |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 3 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 pivalue of pi (3.1415..) can be recalled 1/xreciprocal trigtrigonometrical functions (sin, cos, tan and inverses: arcsin, arccos, arctan) logexponential and logarithmical functions (10- and e-base) yxraising to power |
| Display: | 12 digit VFD (Itron FG125A2) |
| Power: | 4×AA battery or adaptor |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 61.2093 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.00705E-70 |
X-2
Inside of the X-2
Keyboard and display of the X-2
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