Date of introduction:  November 1983 Display technology:  LCD
New price:   Display size:  8
Size:  2.1" x 3.4" x 0.03"
 54 x 85 x 0.8 mm3
Weight:  0.4 ounces, 12 grams Serial No:  4L105A
Batteries:  n.a. Date of manufacture:  
AC-Adapter:   Origin of manufacture:  Japan
Precision:  8  Integrated circuits:  
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

Within the Datamath Calculator Museum you'll notice a lot of credit card sized calculators like the TI-1754, TI-1780, TI-1786, TI-307, Canon LC-7, Casio LC-79, or Toshiba LC-851. All these calculators have two dimensions common: The length and the width. But we never talked about the third dimension, the height or thickness of the calculators. 

The Casio FILM CARD SL-800 is the only real credit card sized calculator and matches exactly the ISO 7810 standard. This standard is valid for all credit and debit cards and defines a size of 85mm x 54mm x 0.8mm (3.375" x 2.175" x 0.030").

Squeezing a calculator in such a thin housing is not the easiest job and some limitations are obvious:

Be sure not to damage the unit by bending or dropping. For example, do not carry it in your hip pocket. 
If any part of the display or its reverse side is touched, it will momentarily discolor, however,
  this is not a malfunction but results from the unit's super thinness. Special care should be taken
  not to excessive pressure the display or push it with a pointed object in order to prevent malfunctions. 
Note that the unit has small indentations which are a necessary part of the production process. 
Since the unit is composed of precision electronic parts, never attempt to take it apart. 

horizontal rule

If you have additions to the above article please email:

Joerg Woerner, February 28, 2004. No reprints without written permission.