DATAMATH CALCULATOR MUSEUM
Canon Checkbook II
|Date of introduction:||1985||Display technology:||LCD|
|New price:||Display size:||8|
|Size:|| 2.8" x 5.9" x
70 x 151 x 3.5 mm3
|Weight:||2.6 ounces, 74 grams||Serial No:||630407|
|Batteries:||1*LR55||Date of manufacture:||year 1985|
|AC-Adapter:||Origin of manufacture:||Japan|
|Precision:||8||Integrated circuits:||Toshiba T7752S|
|Program steps:||Courtesy of:||Joerg Woerner|
Canon of Japan introduced already in 1982 with the Checkbook a portable Account Manager. We know a lot of spin offs from this design like the National Semiconductor NS-103 A, the Olivetti Chequebook, the Radio Shack EC-430 or the Texas Instruments TI-2200 II Checkwriter.
But none of the products looks more beautiful than this Checkbook II and its twin. Due to the innovative membrane keypad its thickness is only 0.14" compared with nearly 0.30" of the original Checkbook calculator.
was this possible? Removing the backside of the calculator gives a novel
construction. Instead the usual printed circuit board (PCB) we notice a thin and
flexible foil with single-sided traces.
The board itself uses only few components, and each one is thinner than usual. Even the Toshiba T7752S single-chip calculator circuit looks smarter than the NEC uPD1833 found inside the first Checkbook products.
beauty was donated
by Dale and Rhonda Hill. Thanks!
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© Joerg Woerner, February 19, 2004. No reprints without written permission.