DATAMATH CALCULATOR MUSEUM
|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
|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|
|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: firstname.lastname@example.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.