TI-55

The TI-55 is a programmable calculator first manufactured by Texas Instruments in 1977. It has an LED display,[1] 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.[2]

TI-55 II
a TI 55-II
TypeProgrammable
ManufacturerTexas Instruments
Introduced1977
Discontinued1979
Calculator
Precision11 Floating point (within display)
Display typeLCD
Display size8+2
CPU
ProcessorTI TMC1503NL
Programming
Other
Power supplybattery / cells
Power consumption2 LR44's
Weight84 grams (3.0 oz)
Dimensions147 mm × 71 mm × 22 mm (5.8 in × 2.8 in × 0.85 in)

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 III manufactured since 1986. It was also offered free of charge in exchange of faulty Texas Instruments calculators of a similar class like the TI-54 in Europe in 1986.

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References


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