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Additional Pictures 

 

The battery compartment of the Montgomery Ward TXI-8646A 
calculator gives access to 4 AA sized alkaline cells.

The printed circuit board (PCB) of the Montgomery Ward TXI-8646A looks
different to our expectation - a calculator circuit in a  40-pin housing.
Please notice the small number near the display: 13-04-709-478.

 

The calculator circuit was manufactured in the 5th week of 1974 
by Western Digital and featured already a 4-key memory.


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

Joerg Woerner, September 20, 2002. No reprints without written permission.