Bowmar 901C
Brief History
As early as the end of the 1960s, the American instrument manufacturer Bowmar wanted to use LED displays which features simpler design, lower power consumption, and smaller size than traditional Nixie tubes to display various numerical results and values on its state-of-the-art equipment. When Bowmar hit the market in 1971 with the first american-made pocket calculator (Bowmar 901B), production of the small, eight-digit LED display panels named Optostic began at Bowmar’s Canadian plant. To supply the Canadian market, Bowmar not only delivered the displays to their assembly plant in the U.S., but from 1972, also assembled calculators in Canada. Initially, they had separate model numbers, so the Canadian version, which was identical to the 901B, was marked 901C.
| Manufacturer: | Bowmar-Ali Inc. (USA/Canada) |
| Mfg. date: | 1972 |
| Size: | 7,8×13,2×3,7 cm |
| Weight (ready for operate): | n.a. |
| Type: | four-function |
| Capacity: | 8 digits (input/display) 8 digits (internal precision) |
| Operating logic: | arithmetic |
| CPU: | Texas Instruments TMS0103NC |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) |
| Features: | Ffloating-point notation |
| Display: | 8+1 digit LED (Bowmar Optostic) |
| Power: | 6×AA NiCd battery (built-in) |
901C
Inside of the 901C
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