DATAMATH CALCULATOR MUSEUM
JCE Percent Calculator
|Date of introduction:||1973||Display technology:||LED-modules|
|New price:||Display size:||8|
|Size:|| 5.5" x 3.2" x
139 x 82 x 42 mm3
|Weight:||7.1 ounces, 202 grams||Serial No:||902547|
|Batteries:||4*AA||Date of manufacture:|
|AC-Adapter:||Origin of manufacture:||USA|
|Program steps:||Courtesy of:||Joerg Woerner|
JCE (John Collins Enterprises) located in Palo Alto, CA developed and manufactured only few portable electronic calculators around 1972. All known models (JCE Mark II, Percent, Super D) use the famous Texas Instruments Klixon™ keypad and sport huge 8-digit LED displays. JCE went out of the calculator business sometimes in 1973 to 1974.
side-view of the JCE Percent calculator gives an idea of the convenient reading
angle of the display.
The display itself uses huge, single 7-segment modules manufactured by US-based company Fairchild.
The TMS0128 single-chip calculator IC added to the basic functions of the original TMS1802 circuit (better known as TMS0102) the %-function. Other calculators like the Litronix Checkmate 1002 used one position of the space-limited Klixon™ keyboard for the decimal switch. JCE found another solution, the switch was hidden somewhere.
Another known calculator using the TMS0128 is the Canon LE-82. Engineers in Japan just removed that switch.
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© Joerg Woerner, October 24, 2002. No reprints without written permission.