DATAMATH CALCULATOR MUSEUM
Canon Checkbook II (Black)
|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:||602072|
|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|
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
the Olivetti Chequebook,
the Radio Shack EC-430 or the Texas
Instruments TI-2200 II
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.
this Checkbook II calculator manufactured in 1985 reveals a very interesting
construction based on a plastic frame and a very thin foil with single-sided
traces instead the traditional printed circuit board (PCB).
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.
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© Joerg Woerner, January 17, 2011. No reprints without written permission.