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