DATAMATH CALCULATOR MUSEUM
|Date of introduction:||1978||Display technology:||2 LCD (yellow)|
|New price:||Display size:||8|
|Size:|| 5.3" x 2.7" x
135 x 68 x 10 mm3
|Weight:||3.0 ounces, 86 grams||Serial No:||047040|
|Batteries:||3*LR44||Date of manufacture:|
|AC-Adapter:||Origin of manufacture:||Japan|
|Precision:||8||Integrated circuits:||NEC uPD877G, ?|
|Program steps:||Courtesy of:||Joerg Woerner|
Tokyo Shibaura Electric Co., Ltd., better known as Toshiba - the official name since 1978 - introduced early in their history this combination of a calculator and clock. This LC-831W combines a standard calculator like the LC-830 with an additional watch module. Please notice the grey color of the clock display and the extra LIGHT-button.
the LC-831W reveals indeed a printed circuit board (PCB) with two different
integrated circuits. The bigger one - a NEC uPD877G - includes the complete
calculator functions, the smaller one - unfortunately without designation - is
connected only to the small clock display, an quartz oscillator and some small
Later products like the LC-833WA combined the calculator and clock into only one integrated circuit driving a common LC-Display.
If you are curious about the first calculator-clock combos you should visit three products introduced already in 1972 and 1973: Garrett 2002, Corvus 305, and Texas Instruments TI-3510.
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© Joerg Woerner, February 27, 2004. No reprints without written permission.