The TI-55 is a programmable calculator first manufactured by

Texas Instruments Texas Instruments Incorporated (TI) is an American technology company headquartered in Dallas, Texas, that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globa ...

in 1977. It has an LED display, and weighs 6.4 ounces (180 grams). It is programmable to hold up to 32 key-codes that allow the user to repeat simple calculations with different values.

Variants

TI-55 II

The TI-55 II with LCD was introduced in 1981, but, like many other Texas Instruments calculators of this time, suffered from serious keyboard reliability problems. Several variants of the TI-55 II exist.

TI-55 III

The TI-55 III replaced the TI-55 II in the USA in 1986. It features redesigned keyboard mechanics, thereby eliminating the common "bouncing keys" fault of prior models. Several variants of the TI-55 III exist.

TI-56

The TI-56 is a European variant of the TI-55 manufactured since 1976. The SR-56 uses the TMC0501 scalable calculator architecture like the SR-50, SR-51 and SR-52. The TI SR-56 was followed shortly by the TI 57 which is similar in many ways but can not be connected to the PC-100 printer. Date of introduction: May 21, 1976 Display technology: LED 10 + 2 Size: 5.8" x 3.:;2" x 1.3" 147 x 81 x 32 mm. Weight: 8.5 ounces, 240 grams Jmm Manufacturer: Texas Instrumentsr

References

External links

TI-55 II user manual
Texas Instruments programmable calculators {{microcompu-stub