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Busicom LE-100A "handy" |
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Busicom LE-100A "handy" Display is 10 digits red LED. Four-function. Integrated circuit - Texas Instruments TMS0106 (here date coded week 11 of 1973). Batteries - 6v, 4x AA. 67 x 124 x 25 mm (2.6" x 4.9" x 1.0"). Went on sale in September 1972. Made in Japan by Nippon Calculating Machine Corporation. This is one of the Busicom "handy" models (the first was the LE-120A) which were the first pocket-sized calculators. |
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The electronic components are packed onto two small circuit boards behind the keyboard. On this board the black package of the Texas Instruments TMS0106 "calculator on a chip" integrated circuit can be made out on the left, behind the components at the front. The introduction in late 1970/early 1971 of the Mostek MK6010 "calculator on a chip" integrated circuit combined with the use of 7-segment LEDs made it possible to fit all of the electronics of a
calculator into a very small space, so producing the first truly pocket-sized calculator, the Busicom LE-120A "handy". |
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Vintage Calculators |
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© Text & photographs copyright Nigel Tout 2000-2008 except where noted otherwise. |
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