Tandy Radio Shack EC-475
Brief History
The american-canadian General Instrument coporation tried assembling calculators for a short period, since the most important part, the LSI chip was manufactured by itself in a very wide spectrum. The smartest member of the modest pocket calculator family, the EZ3500 was also produced for other companies, e.g. Tandy's Radio Shack EC-475 is the same, except for the coloring and labelling.
A small series of the inaccurate and very primitive GI calculator was bought by Híradástechnika Szövetkezet for assembling in Hungary. These machines were marketed as TK-891 in 1975.
| Manufacturer: | Tandy Corporation (USA) |
| OEM: | General Instrument (USA) |
| OEM model: | EZ3500 |
| Mfg. date: | 1975 |
| Size: | 7,7×15,2×2,5 cm |
| Weight (ready for operate): | n.a. |
| Type: | scientific |
| Capacity: | 8/5+2 digits (input/display) 8/8+2 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | General Instrument CF596 |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 1 memory (with aritmetic) |
| Features: | 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) |
| Display: | 9 digit LED (Bowmar Optostic) |
| Power: | 9V battery or adaptor |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 67.497 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 - |
EC-475
The Radio Shack and the hungarian version
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