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TI-55
The TI-55 is a programmable calculator first manufactured by Texas Instruments in 1977. It had an LED display,〔http://mycalcdb.free.fr/main.php?l=0&id=1770〕 and weighed 6.4 ounces (180 grams). It was programmable to hold up to 32 key-codes that would allow the user to repeat simple calculations with different values.〔http://www.datamath.org/Sci/MAJESTIC/TI-55.htm〕 ==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.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「TI-55」の詳細全文を読む
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