DATAMATH CALCULATOR MUSEUM
|
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
0.14" 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 |
| Memories: | 3 | ||
| 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 similar products like the
IMA
130CBW, National Semiconductor NS103A, Radio Shack EC-306,
Royal LCB 841, Texas Instruments
TI-2200 Checkwriter, or Unisonic LC 263CK.
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.
How
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 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.
This
beauty was donated
by Dale and Rhonda Hill. Thanks!
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, February 19, 2004. No reprints without written permission.