DATAMATH CALCULATOR MUSEUM |
Canon F-55S
Date of introduction: | November 1979 | Display technology: | LCD |
New price: | Display size: | 8 (5 + 2) | |
Size: | 3.7" x 2.2" x 0.30" 94 x 56 x 8 mm3 |
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Weight: | 1.6 ounces, 44 grams | Serial No: | 447029 |
Batteries: | CR2016 | Date of manufacture: | year 1980 |
AC-Adapter: | Origin of manufacture: | Japan | |
Precision: | 8 | Integrated circuits: | Toshiba T3934S |
Memories: | 1 | ||
Program steps: | Courtesy of: | Joerg Woerner |
The Palmtronic F-55S is one of the smallest scientific / statistical calculators ever developed.
How
was it possible to reduce a calculator like the TI-25
introduced in the same era to the size of a credit card ? Quite simple, the
engineers of Canon reduced the keyboard dramatically using a sliding switch. The
switch is located at the right of the display and connects one of the 4
associated functions to one row of 4 keys.
Adding the keys together gives 24 discrete keys plus 4 rows of 4 multiplexed keys equals 40 keys. The magic number of 40 keys is usual for the early Toshiba calculator chips with scientific functions. Count the keys yourself on the Toshiba SLC-8260 or SLC-8410.
Don't miss the F-55S in a silver housing.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.