Omron 8SR
Brief History
Omron closed the financial year 1975 with a very serious loss of 15 million yen, not least as a result of the price explosion of calculators. The following year, the aim was to rationalize production and revise the product structure. Unfortunately, the simpler, cheaper-to-manufacture models did not solve Omron’s problems, so the production of pocket calculators ceased in 1976.
One of the last novelties of 1976 was Omron 8SR scientific calculator using Hitachi's rarer chip, which caused a slightly different layout from similar machines. As can be seen on Commodore models, the full mantissa of the 8+2-digit results can be displayed by pressing the E↔F key in exponential mode. It is also interesting to note that the 8SR is only available in blue-white, the 8SRE (for European distribution) is only available in green-black designs.
| Manufacturer: | Omron Tateisi Electronics Co. (Japan) |
| Mfg. date: | 1976 |
| Size: | 7,4×11,7×2,4 cm |
| Weight (ready for operate): | n.a. |
| Type: | scientific |
| Capacity: | 8/5+2 digits (input/display) 8+2 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | Hitachi HD36109 |
| Registers: | 2 standard (with saving the pending operation) 1 constant (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 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: | 9 digit VFD (Itron DP95P) |
| Power: | 2×AA battery or adaptor |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 61.157225 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 2.8054320E-70 |
8SRE
Inside of the 8SRE
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