Silver-Reed SR 104
Brief History
The japanese Silver-Reed corporation distributed some scientific calculators over the years. One of the most interesting is model SR 104, certainly, owing to its unusual operation. It used a Rockwell CPU, which handle all numbers in scientific notation without zero suppressing. The not so comfortable machine had a poor calculation accuracy too, and used a very strange keyboard layout. It has some advantages compared to other calculators in its category: it can convert coordinates and angles, and can compute trigonometric functions with grads.
| Manufacturer: | Silver Seiko International (Japan) |
| Mfg. date: | 1976 |
| Size: | 8,4×16,1×3,8 cm |
| Weight (ready for operate): | 199 g |
| Type: | scientific |
| Capacity: | 8+2 digits (input/display) 8+2 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | Rockwell LA4806CB |
| 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) 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 |
| Display: | 12 digit VFD (Itron FG125A2) |
| Power: | 3×AA-size battery 4,5V 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 |
Silver-Reed SR 104
Inside of the SR 104
Keyboard of the SR 104
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