A quick review of the Texas Instruments TI 25 Slimline. It is over 38 years old.
With the TI-25 Texas Instruments entered in 1978 the market of scientific LCD-calculators. On a first view the TI-25 looks like one of the later slimline models TI-50 or TI-35 but it is totally different. This calculator was produced in Japan in opposite to the later US origin of the slimline models and is somewhat larger.
TI-25_1_PCB.jpg (116525 Byte)TI-25_1_IC.jpg (120494 Byte)The electronics of the TI-25 is based on a Toshiba design with only 9 digits of calculating precision instead of the later US designs with 11 digits precision. Comparing the TI-25 with the Toshiba SLC-8260 gives the impression that the whole calculator is is a Toshiba design.
The first version of the TI-25 was soon replaced with a design using the PN1033734 calculator chip. Find more information here. Don’t miss a rare TI-25 with a yellow polarizer for the liquid crystal display.
The Texas Instruments TI-25 STAT is a scientific calculator with 8 digits precision and algebraic logic. It has 43 functions, 40 keys and an LCD (liquid crystal) display. The calculator was manufactured in Japan.