DATAMATH CALCULATOR MUSEUM
|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|
|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
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© Joerg Woerner, March 27, 2003. No reprints without written permission.