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 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.
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 Toshiba T7752S single-chip calculator circuit looks smarter than the NEC
uPD1833 found inside the first Checkbook products.
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.