Sanyo ICC-82D Mini Calculator (2nd design)

Date of introduction:  January 1971 Display technology:  Gas-discharge tubes
New price:   Display size:  8
Size:  8.2" x 5.3" x 1.9"    
Weight:  2 pounds 5 ounces Serial No:  unknown
Batteries:  internal 6V Date of manufacture:  year 1971
AC-Adapter:  CU-82E, 220V Origin of manufacture:  Japan
Precision:  16 Integrated circuits:  Sanyo LM8001, LM8002, LM8003, LM8005
Program steps:   Courtesy of:  Joerg Woerner

ICC-82D_Disp.jpg (31592 Byte)The second design of the ICC-82D was introduced in January 1971 together with the ICC-0081 and replaced the unusual Nixie tubes with more common gas-discharge tubes featuring a seven-segment layout. Everything else seems at first glance to be identical.

ICC-82D_PCB.jpg (193694 Byte)Dismantling the featured calculator reveals no big surprises, the internal construction looks very familiar to us. The main differences, beside the display and its associated driving electronics, are found with the integrated circuits. While the original design used four integrated circuits with SANYO LM8001, LM8002, LM8003, and LM8004 markings, replaced the second design the LM8004 chip with the LM8005 chip. We assume that these chips are responsible for the decoding of the binary presentation of the calculating results to the 10 individual signals of the Nixie tube (LM8004) resp. seven-segment patterns of the gas-discharge tubes (LM8005).

The later ICC-804D at least combined the LM8005 chip with a seven-segment LED display.

On the U.S. market the calculator was sold as Dictaphone 1680.  

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Joerg Woerner, March 28, 2003. No reprints without written permission.