DATAMATH  CALCULATOR  MUSEUM

Additional Pictures 

 

This Exactra 20 uses an unique LED display with
only 6 digits and a leading sign position. The small
numbers are enlarged by a bubble lense stick. 

The printed circuit board (PCB) of the Exactra 20
with the TMS0135 single-chip calculator circuit and
one additional display driver. 


If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, October 17, 2003. No reprints without written permission.