DATAMATH CALCULATOR MUSEUM
|
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
1.65" 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 | |
| Precision: | 8 | Integrated circuits: | TMS0128 |
| Memories: | |||
| Program steps: | Courtesy of: | Joerg Woerner |
JCE (John
Colling 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.
The
side-view of the JCE Percent calculator gives an idea of the convenient reading
angle of the display.
The
display itself uses large, 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.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, October 24, 2002. No reprints without written permission.