Texas Instruments TI-57 II
Brief History
Texas Instruments introduced the classic TI-57 in 1977, the middle-class member of the programmable calculator family. The easy-to-use model which can be used for solving several common problem, was redesigned in 1983: the old-style LED display has been replaced by a liquid crystal display, so the machine could be used with two button cell batteries, and has a continuous memory which can retain the memory contents upon power-off. The new materials used in the new keyboard became unusable in months, so the TI-57 LCD was replaced by the TI-57-II with rubber membrane keyboard in 1984. Both new models have much lower memory area, so only smaller programs or less numbers can be stored in these machines compared to the classic TI-57.
This model was produced in Hungary too, by Híradástechnika Szövetkezet in 1985.
| Manufacturer: | Texas Instruments (USA/Italy) |
| Mfg. date: | 1985 |
| Size: | 7,4×14,7×2,2 cm |
| Weight (ready for operate): | 90 g |
| Type: | programmable scientific |
| Capacity: | 8/8+2 digits (input/display) 11/11+2 digits (internal precision) |
| Operating logic: | AOS |
| CPU: | Texas Instruments CD4572BN2 + CD4555BNL |
| Registers: | 3 standard (with saving the pending operation) 15 bracket maximum of 7 memory (with aritmetic) |
| Features: | +/-change sign (direct entry of negative numbers) Ffloating-point notation Fixfixed-point notation: the listed decimals can be chosen (0-7) 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) DMS-DDconversion of decimal and sexagesimal numbers logexponential and logarithmical functions (10- and e-base) yxraising to power P-Rconverting coordinates between rectangular and polar systems n!factorial |
| Display: | 8+2+2 digit LCD |
| Power: | 2×LR44 button cell |
| Programming method: | merged keystroke-programmable |
| Program capacity: | maximum of 48 steps |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 60.019845215 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.006920635E-70 |
TI-57-II
Inside of the TI-57-II
Similar items
