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Toshiba LC-851

Date of introduction:  1979 Display technology:  LCD 
New price:   Display size:  8
Size:  3.6" x 2.3" x 0.17"    
Weight:  1.7 ounces Serial No:  69808
Batteries:  CR2420 Date of manufacture:  
AC-Adapter:   Origin of manufacture:  Japan
Precision:  8 Integrated circuits:  
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

Toshiba introduced around 1979 with the LC-851 a very thin but robust calculator.

LC-851_1.jpg (67296 Byte)Dismantling the calculator reveals some surprises:

It uses still a rigid printed circuit board (PCB) instead the common flexible boards.
LC-851_PCB.jpg (70550 Byte)The integrated circuit is attached and bonded directly to the PCB. Probably the LC-851 is the first calculator using COB (chip-on-board) technology. Within two years the LC-866 switched back to a traditional internal construction.

Don't miss other credit card sized calculators of that timeframe and visit the Canon LC-6.

Don't miss the Casio FIML CARD SL-800, a real credit card sized calculator with a thickness of only 0.030".

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

Joerg Woerner, February 27, 2004. No reprints without written permission.