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Additional Pictures 

 

The module expander found with the incotax 
application is known from the CAL-Q-TAX.

The modules are removable from the CAL-Q-TAX
socket adapter. 

The printed circuit board (PCB) of the CAL-Q-TAX
module reveals its genes.

The base calculator of this incotax application is a
standard TI-58C manufactured already in 1980.


horizontal rule

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

Joerg Woerner, November 20, 2003. No reprints without written permission.