Texas Instruments TI-30 SLR
Brief History
By the 1980s, Japan has unique knowledge of solar cell operated calculators. Texas Instruments arranged a profitable collaboration with Toshiba: they produced a wide range of new calculator models for TI, and gave the new technology for a reliable rubber membrane keyboard for them. In 1982 Texas Instruments introduced a fully Toshiba-made TI-30 SLR model, the first TI solar-powered scientific calculator. Its functionality was identical to the TI-30 LCD (TI-30 II), but the T6825 IC in the first series has worse accuracy than the original TI-30 model from 1976: it has only 9+2 digit internal capacity.
| Manufacturer: | Texas Instruments (USA/Japan) |
| OEM: | Toshiba Corporation (Japan) |
| OEM model: | n.a. |
| Mfg. date: | 1982-83 |
| Size: | 6,8×13,5×1 cm |
| Weight (ready for operate): | n.a. |
| Type: | scientific |
| Capacity: | 8/5+2 digits (input/display) 9+2 digits (internal precision) |
| Operating logic: | custom |
| CPU: | Toshiba T6825S |
| Registers: | 3 standard (with saving the pending operation) 1 constant (with saving the pending operation) 15 bracket (with saving the pending operation) 1 memory (with aritmetic) |
| Features: | %calculation with percent +/-change sign (direct entry of negative numbers) 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 n!factorial |
| Display: | 9 digit LCD (EPSON LD-B3054) |
| Power: | solar cell |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 59.987247 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.00688E-70 |
TI-30 SLR
Inside of the TI-30 SLR: IC is under the solar cell
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