DATAMATH CALCULATOR MUSEUM
|
DATAMATH CALCULATOR MUSEUM |
Exactra 21 Prototype by Texas Instruments
| Date of introduction: | March, 1974 | Display technology: | LED-modules |
| New price: | Display size: | 8 | |
| Size: | 5.1" x 2.8" x 1.3" | ||
| Weight: | 7 ounces | Serial No: | none |
| Batteries: | 3*AA | Date of manufacture: | wk 09 yr 1974 |
| AC-Adapter: | Origin of manufacture: | USA | |
| Precision: | Integrated circuits: | TMS0803 | |
| Memories: | |||
| Program steps: | Courtesy of: | Joerg Woerner |
The
rare prototype of the Exactra 21 uses a different
display construction compared to the later series model. Instead the cheap
LED-stick we'll notice 9 small LED-modules with an additional magnifier lense.
The
printed circuit board (PCB) of the prototype is already in the final design
stage. The date code found on the TMS0803
single-chip calculator circuit
indicates week 9 or early in March, 1974.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, October 17, 2003. No reprints without written permission.