Canon F-58

Date of introduction:  1984 Display technology:  LCD
New price:   Display size:  8 (5 + 2)
Size:  5.6" x 2.8" x 0.4"  
Weight:  3.6 ounces Serial No:  
Batteries:  LR1130 Date of manufacture:  year 1986
AC-Adapter:   Origin of manufacture:  Japan
Precision:  11  Integrated circuits:  Toshiba T7750S
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

The Canon F-58 Scientific Statistical Calculator traces back to the Texas Instruments TI-31 Solar

F-58_IC.jpg (55929 Byte)If we run the Calculator Forensics on the F-58 we discover the same 11-digit precision found on the TI-31 Solar family. If you compare the two calculators you will notice totally different features, keyboard layout and even number of keys. This gives you a rough approach of the flexibility designed into the Toshiba calculator chips.

F-58_PCB.jpg (131043 Byte)The internal construction of the F-58, based on the LX-40 calculator, is very sophisticated. Just a small, one-sided printed circuit board (PCB) attached to the LC-display, battery and the keyboard. The keyboard itself uses a sandwich of two conductive foils with an isolating spacer between them. The sheet metal supports the connections of the PCB to the LC-display and the keyboard. 

The FS-51 used the same calculator circuit with solar-cells instead the batteries, the F-42 misses the statistical functions. Don't miss the odd F-56 introduced in 1981.

If you have additions to the above article please email:

Joerg Woerner, September 27, 2002. No reprints without written permission.