Texas Instruments TI-2550
Brief History
Texas Instruments, seeing the success of emerging calculator manufacturers, in addition to further developing the circuits built for such machines, has sought to enter the domestic market with newer, cheaper pocket calculators. The first four-function model - the TI-2500 Datamath - and then the SR-10, which was expanded with exponential notation and some functions known from simpler slide rules, appeared in 1972. Texas Instruments launched the TI-2550 in January 1974, with an innovation that similar competing machines did not have: in addition to the standard floating-point mode, it could be set to a 2 or 4 fixed-decimal display. The pretty huge machine was replaced in 1975 by the new, much smaller machine with expanded functionality, the TI-2550-II. This year, Texas Instruments has wide variety of machines from basic models to scientific or even programmable ones, and has strength position not only in the American but also in the European market.
| Manufacturer: | Texas Instruments (USA) |
| Mfg. date: | 1974 |
| Size: | 8×16,5×4,5 cm |
| Weight (ready for operate): | n.a. |
| Type: | four-function |
| Capacity: | 8 digits (input/display) 8 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | Texas Instruments TMS0601NC |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 1 memory (with aritmetic) |
| Features: | %calculation with percent +/-change sign (direct entry of negative numbers) Ffloating-point notation Fixfixed-point notation: the listed decimals can be chosen (2, 4) |
| Display: | 9 digit LED |
| Power: | 3×AA NiCd or 4×AA battery or adaptor |
TI-2550
Inside of the TI-2550
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