Bowmar MX-140
The Bowmar Brain MX-140 with Continental brand is a curiosity, because it was of the last series produced with Bowmar name in Mexico. As Bowmar didn't able to launch the semiconductor plant, surviving this industry segment became hopeless. At last chance, Bowmar decided to sell the entire production of calculators and watches to International Fastener Research Corporation in June 1975, who soon passed it to Continental Microsystems. The company tried to make other products more popular with Bowmar brand, what Bowmar Corporation complained. Lawsuit was won by Bowmar, but Continental had stopped further development and production of calculators due to falling prices and uneconomical production.
This model was produced in 1974 under the name TK-835 by Híradástechnika Szövetkezet in Hungary too.
| Manufacturer: | Bowmar-Ali Inc. (USA/Mexico) |
| Mfg. date: | 1974 |
| Size: | 7,8×13,2×3,7 cm |
| Weight (ready for operate): | 262 g |
| 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 battery (built-in) |
| 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 |
MX-140
Insode of the MX-140
MX-140 with original packaging
