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Additional Pictures 

 

The 5TI Programmer side by side with the SR-20 calculator..

Dismantling the 5TI Programmer reveals a stack of printed circuit boards (PCBs).
The top PCB carries the keys and their Indicator LEDs and the middle PCB
the display module from the SR-20 and some interface chips.

The bottom PCB finally holds all the logic of the 5TI Programmer
with a total of 39 Integraded Circuits (ICs).


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

© Joerg Woerner, December 29, 2002. No reprints without written permission.