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Canon F-720

Date of introduction:  2001 Display technology:  LCD
New price:   Display size:  12 characters and  10 +2
Size:  5.6" x 3.1" x 0.45"    
Weight:  2.8 ounces Serial No:  
Batteries:  2*LR44 Date of manufacture:  mth 01 year 2002
AC-Adapter:   Origin of manufacture:  China
Precision:  Internal 24-digit (binary)  Integrated circuits:  
Memories:  26    
Program steps:   Courtesy of:  Joerg Woerner

This Canon F-720 added a two-line display with formula entry to the functions known from its predecessor F-700.

F-720_PCB.jpg (42921 Byte)Dismantling this powerful calculator is somewhat disappointing. There is no hint to the true manufacturer of this OEM-calculator.
Running Mike Sebastian's "Calculator forensics" reveals the Canon F-720 as one of the "new-generation" calculators using binary arithmetic instead of the common BCD (Binary Coded Decimal) arithmetic to perform internal calculations. According to the manual this calculator uses up to 24 digits of precision and we get indeed the unbelievable result of 9.00000000005281641187... running the forensics test. 



If you have additions to the above article please email: joerg@datamath.org.

© Joerg Woerner, September 20, 2003. No reprints without written permission.