Canon Palmtronic F-61

Date of introduction:  year 1977 Display technology:  Fluorescent
New price:   Display size:  8 + 2
Size:  5.9" x 3.3" x 1.05"
 150 x 84 x 27 mm3
Weight:  6.3 ounces, 179 grams Serial No:  836290
Batteries:  4*AA Date of manufacture:  year 1977
AC-Adapter:   Origin of manufacture:  Japan
Precision:  8 Integrated circuits:  NEC uPD955C 
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

The Palmtronic F-61 is another calculator manufactured by Canon missing a calculator chip from Texas Instruments. The brain of the F-61 is a NEC uPD955C chip, obviously an enhanced version of the uPD951C found in the F-51.

Running Mike Sebastian's "Calculator forensics" gives an unacceptable bad result of 9.2079408 instead the expected value close to 9.0000. This places the F-61 in the league of disappointing calculators like the Canon F-6 (12.199423) and Rockwell 61R (10.4328).

The other calculators in the early scientific line are the F-31, F-41, F-51 and the F-71.

Within one year Canon introduced much sleeker calculators with LC-Displays, don't miss the F-52 and F-62 siblings.

If you have additions to the above article please email:

Joerg Woerner, March 27, 2003. No reprints without written permission.