DATAMATH CALCULATOR MUSEUM
|
DATAMATH CALCULATOR MUSEUM |
Additional Pictures
| This Exactra 21 uses a standard LED display
with 9 digits. The small numbers are magnified by a bubble lense stick.
|
This rare Exactra 21 prototype
was manufactured with 9 single LED-modules instead the later bubble stick. Once again we notice the clear magnifier.
|
| The printed circuit board (PCB)
of the Exactra 21 with the TMS0803 single-chip calculator circuit and one additional display driver plus transistors.
|
The PCB of the prototype seems to be
indentical with the later series calculator. The date code on the calculator circuit indicates the market introduction.
|
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, October 17, 2003. No reprints without written permission.
