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|
|Program steps:||Courtesy of:||Joerg Woerner|
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.
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© Joerg Woerner, October 17, 2003. No reprints without written permission.