Híradástechnika TK-835
Brief History
This model was the only scientific model in the HírBow hungarian-canadian cooperative-made calculator family announced in 1973.
After the success of previous basic models, the Bowmar's MX-120 was planned to be produced, but instead of this,
manufacturing of the MX-140 was started in 1974. This model was the last in this family which had been discontinued
due to bankruptcy of Bowmar Corporation.
| Manufacturer: | Híradástechnika Szövetkezet (Hungary) |
| OEM: | Bowmar-Ali Inc. (USA) |
| OEM model: | MX-140 |
| Mfg. date: | 1974 |
| Size: | 7,8×13,2×3,7 cm |
| Weight (ready for operate): | 262 g |
| Price: | HUF 24.000 (HT, MIGÉRT, 1974) |
| Type: | scientific |
| Capacity: | 10/10+2 digits (input/display) 10/10+2 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | MOS MCS2525 002 + MCS2526 002 |
| Registers: | 2 standard (with saving the pending operation) 2 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 x2square 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: | 10+2+2 digit LED (Bowmar Optostic) |
| Power: | 6×AA NiCd rechargeable battery (built-in) chargeable with E-69 adaptor |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 60.063296 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.00704092E-70 |
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