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Casio MINI CARD LC-79

Date of introduction:  October 1977 Display technology:  LCD
New price:   Display size:  8
Size:  3.3" x 2.1" x 0.13"
 85 x 54 x 3.4 mm3
   
Weight:  1.1 ounces, 31 grams Serial No:  1175283
Batteries:  2*GOU Date of manufacture:  year 1979
AC-Adapter:   Origin of manufacture:  Japan
Precision:  8  Integrated circuits:  Toshiba T3708S
Memories:      
Program steps:   Courtesy of:  Joerg Woerner

Casio Computer Co., Ltd introduced with the MINI CARD LC-79 in 1977 a beautiful calculator with exactly the size of a credit card. While Casio advertised the calculator as thin as 1.9 mm did we measure actually 3.4 mm including the glass of the LC-display. Nevertheless an astonishing calculator beaten only two years later by Sharp's EL-8152.

Dismantling this Casio LC-79 manufactured in 1979 reveals a very interesting design centered around a Toshiba T3708S single-chip calculator circuit.

Please notice the unusual polarity of the two 1.5 V silver oxide batteries, the can is negative and the center positive!

 

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

Joerg Woerner, December 30, 2014. No reprints without written permission.