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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
   
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). 



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If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, June 28, 2003. No reprints without written permission.