DATAMATH CALCULATOR MUSEUM
|Date of introduction:||1974||Display technology:||LED-stick|
|New price:||Display size:||8 + 2|
|Size:||7.0" x 3.4" x 1.8"|
|Weight:||10.2 ounces||Serial No:||503217|
|Batteries:||4*AA||Date of manufacture:||year 1974|
|AC-Adapter:||Origin of manufacture:||Japan|
|Precision:||10||Integrated circuits:||Hitachi HD3650, HD3651, HD3653, HD3666|
|Program steps:||Courtesy of:||Joerg Woerner|
The Palmtronic F-7 was introduced shortly after the Texas Instruments SR-50 and uses a very similar calculator architecture developed by Hitachi. Instead the single-chip calculator chips found inside the F-5 and F-6 models, it uses a processing chip (CPU) HD3650 surrounded by a Read Only Memory (ROM) HD3651, a T-CHIP (Timing Chip) HD3653 and the HD3666 labelled PUC. The same CPU was used in the desktop sized Canola F-11 and the metric conversion calculator FC-80.
Comparing the Palmtronic F-7 with the SR-50 gives some differences:
|Number of keys||40||36|
|Display organization||10 + 2||8 + 2|
|Calculating accuracy||13 digits||10 digits|
|Number of memories||1||2|
|Constants and conversions||none||20|
Once again Texas Instruments demonstrated its capabilities in calculating algorithm. The Canon F-7 looks great but lacks precision. We found similar poor performance with the F-5 and F-2. On the other hand takes the calculation of 69! (1*2*3...*69) with the F-7 only a fraction of time compared to the SR-50. It is easy to understand, with similar calculating performance engineers have to balance between speed and accuracy.
Read more about the successful TMC0501 family introduced by Texas Instruments with the SR-50 and expanded till the TI-59.
Don't miss the first TI-less calculator sold by Canon, the LE-80M.
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, July 2, 2002. No reprints without written permission.