Texas Instruments TI-25
Brief History
Texas Instruments, in response to dropping calculator prices, relocated the production of four-function models to Toshiba, Japan. The keyboard of the slim metal-case calculators was using the usual japanese rubber membrane technology, which is easy to use and gives adequate feedback that the key has been pressed properly. The success of such machines prompted the company to produce a such model of scientific calculator in Japan in 1978. Based on the highly successful TI-30, and added statistical capabilities, Toshiba produced the TI-25 with Texas-like keyboard layout and the SLC-8260 with Toshiba-like layout. The quality of the machines is so successful, unlike the American or Italian versions manufactured later, so they still work excellently.
The Japanese-American cooperation in the field of scientific calculators only accelerated from 1982, when production of the solar-powered TI-30 SLR began, and a year later, the replacement of the high-end programmable TI-59, the TI-66 was released.
| Manufacturer: | Texas Instruments (USA) |
| OEM: | Tokyo Shibaura Electric Co., Ltd. (Japan) |
| OEM model: | - |
| Mfg. date: | 1978-80 |
| Size: | 7,3×13,3×1 cm |
| Weight (ready for operate): | n.a. |
| Type: | scientific |
| Capacity: | 8/5+2 digits (input/display) 9+2 digits (internal precision) |
| Operating logic: | AOS |
| CPU: | Toshiba (Texas Instruments) 1033734-1 |
| Registers: | 3 standard (with saving the pending operation) 3 bracket 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 SDone variable statistics: calculating mean and standard deviation n!factorial |
| Display: | 8+1 digit LCD |
| Power: | 2×LR44 button cell |
TI-25
Inside of the TI-25
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