Casio CB-80 Checkbook

Date of introduction:  1983 Display technology:  LCD
New price:   Display size:  8
Size:  2.8" x 6.2" x 0.3"
 70 x 157 x 7 mm3
Weight:  2.4 ounces, 67 grams Serial No:  
Batteries:  CR2025 Date of manufacture:  year 1985
AC-Adapter:   Origin of manufacture:  Japan
Precision:  8  Integrated circuits:  Hitachi HD43570
Memories:  2+1    
Program steps:   Courtesy of:  Joerg Woerner

The Canon Checkbook started the idea of an Account Manager already in 1982 and outdated the Texas Instruments TI-2200 by a few weeks. Casio entered the market of Checkbook calculators in 1983 with the CB-100 and increased the numbers of memories from three to five. A less powerful version with only three memories was sold as CB-80.

The CB-80 Checkbook calculator is powered by a single 3V Lithium battery.

Dismantling this CB-80 Checkbook calculator manufactured in 1985 in Japan reveals an interesting construction centered around a Hitachi HD43570 single-chip calculator circuit.

Learn more about single-chip calculator circuits used in Account ManagerCalculators.

Don't miss the Corvus CheckMaster introduced by Mostek already in 1975. This rare product retains the balance of your memory even when shut off but uses power-hungry electronics.

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Joerg Woerner, November 30, 2019. No reprints without written permission.