DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Canon F-44
| Date of introduction: | April 1983 | Display technology: | LCD |
| New price: | Display size: | 8 (5+2) | |
| Size: | 5.4" x 2.8" x 0.4" 138 x 71 x 10 mm3 |
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| Weight: | 3.9 ounces, 110 grams | Serial No: | |
| Batteries: | 2*LR44 | Date of manufacture: | year 1986 |
| AC-Adapter: | Origin of manufacture: | Japan | |
| Precision: | 9 | Integrated circuits: | Toshiba T6823 |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Joerg Woerner |
This
Canon F-44 followed the
Canon card F-42 introduced in 1980 and replaced the
sliding switches with normal keys.
The internal construction of the calculator
is similar to the LX-40 basic calculator introduced in
the same year and avoids any solder connection. Instead of using a traditional
printed circuit board (PCB) the F-44 uses a flexible foil pressed against a
heavy metal sheet.
Running
Mike Sebastian's "Calculator forensics"
gives an unacceptable bad result of 8.9789682 instead the expected value close to 9.0000.
We know this result from a whole line of Toshiba calculator circuits introduced
between 1977 (T3636 found in the Toshiba SLC-8300)
and 1982 (T6825 found in the TI-30 SLR).
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, June 28, 2003. No reprints without written permission.