Canon card MD-81 aka MULTI 81

Date of introduction:  March 1980 Display technology:  LCD
New price:   Display size:  8 + 8
Size:  4.7" x 2.7" x 0.3"    
Weight:  2.3 ounces Serial No:  358867
Batteries:  2*LR44 Date of manufacture:  year 1980
AC-Adapter:   Origin of manufacture:  Japan
Precision:  8  Integrated circuits:  Toshiba T3715
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

Canon introduced in 1979 with the MD-8 the first pocket calculator using a two-line display. The upper display is the usual working display while the lower line shows the memory content or intermediate results. Main disadvantage of this innovative concept was the power consumption of the display and the used TMS1079 microcomputer resulting in a short operating time of the three AA-sized batteries.

Within one year Canon introduced this MD-81 using a modern LC-Display and a power-efficient Toshiba single-chip microcomputer. A very similiar approach resulted in the novel FC-82 Metric Converter calculators. 

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Joerg Woerner, January 1, 2007. No reprints without written permission.