DATAMATH CALCULATOR MUSEUM
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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
0.14" 70 x 151 x 3.5 mm3 |
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| 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 |
| Memories: | 3 | ||
| Program steps: | Courtesy of: | Joerg Woerner |
Canon
of Japan introduced already in 1982 with the Checkbook
a portable Account
Manager.
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.
Dismantling
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 package of the Toshiba T7752S single-chip calculator circuit is slimmer than the NEC
uPD1833G found inside the first Checkbook products.
Learn more about single-chip calculator circuits used in Account Manager Calculators.
The successor of this Checkbook II was consequently named Checkbook III and brought a rather conventional design back.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, January 17, 2011. No reprints without written permission.