Canon Checkbook

Date of introduction:  1982 Display technology:  LCD
New price:   Display size:  8
Size:  2.8" x 6.0" x 0.3"
 70 x 152 x 7 mm3
Weight:  2.4 ounces, 69 grams Serial No:  42907
Batteries:  CR2025 Date of manufacture:  mth 05 year 1982
AC-Adapter:   Origin of manufacture:  Japan
Precision:  8  Integrated circuits:  NEC uPD1833G
Memories:  3    
Program steps:   Courtesy of:  Joerg Woerner

This Canon Checkbook calculator was introduced in 1982 - about three years after National Semiconductor's NS103 started the idea of an Account Manager - and outdated Texas Instruments' TI-2200 by a few weeks. A less powerful version with only one memory was sold as Checkbook Junior, while the CB-8 Checkbook added a red [A↔F] key to toggle between between two entry modes:

Indicator (--) Floating decimal with manual insertion of the decimal using the [.] key
Indicator (AM) Add mode with the decimal automatically put in the dollars and cents position (0.00)

Canon fitted the Checkbook calculator with a brown sleeve holding a golden pen and space for a maximum of five credit/debit cards.

Dismantling this Checkbook calculator manufactured in 1982 in Japan reveals a very solid construction centered around a NEC uPD1833G single-chip calculator circuit.

In the meantime we discovered a lot of similar products like the IMA 130CBW, National Semiconductor NS103A, Radio Shack EC-306, Royal LCB 841, Texas Instruments TI-2200 Checkwriter, or Unisonic LC 263CK - all sporting the NEC uPD1833G chip located in this Canon Checkbook calculator.

The beautiful Checkbook II and the long lasting Checkbook III replaced the original Checkbook some years later while the Checkbook Recorder marked the eclipse of Account Manager calculators.

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

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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If you have additions to the above article please email:

Joerg Woerner, December 15, 2001. No reprints without written permission.