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 |
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