DATAMATH CALCULATOR MUSEUM
|Date of introduction:||April 1974||Display technology:||LED-stick|
|New price:||Display size:||8|
|Size:|| 5.5" x 3.1" x 1.5"
139 x 78 x 37 mm3
|Weight:||6.5 ounces, 184 grams||Serial No:||517382|
|Batteries:||4*NiCd AA or 4*AA Alkaline||Date of manufacture:||year 1974|
|AC-Adapter:||Origin of manufacture:||Japan|
|Precision:||8||Integrated circuits:||Rockwell A4001-15471|
|Program steps:||Courtesy of:||Joerg Woerner|
The Palmtronic F-5 is a very unusual calculator manufactured by Canon. It was introduced mid of the year 1974 like the Texas Instruments SR-16 or the SR-50.
The F-5 combined due to its Rockwell calculator chip the functions of the SR-50 with the inaccuracy of the SR-16! A similar poor performance could be found in the huge Palmtronic F-7.
The same housing was used with the rare FC-80 metric conversion calculator and the more common LE-81M and LE-100 basic calculators introduced in the same time frame. Later products like the LE-83 used a much cheaper construction.
The next calculator in Canon's scientific line was the F-6 with a complete new housing.
The F-5 wasn't the only "TI-less" calculator sold by Canon in the early days, view the odd LE-81. The last calculator with a TI brain was found with the Palmtronic F-31.
Running Mike Sebastian's "Calculator forensics" returns an unacceptable bad result of 10.4382 instead the expected value close to 9.0000. This places the F-5 in the league of boring calculators like the Canon F-6 (12.199423) and the never released SR-40 prototype (10.271817).
Another known side effect of the poor algorithm of the Rockwell calculator chips could be discovered with the unusual [ax] key:
Rockwell uses - like most other companies - the
It is easy to proof:
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© Joerg Woerner, December 5, 2001. No reprints without written permission.