Additional Pictures 


 This early TI-57 II manufactured in
Taiwan hides the Secondary microcomputer
and makes use of a rigid PCB.

The TP0456 microcomputer based Primary-Secondary architecture found in the
 TI-57 II calculator. The CD4572 is the Primary chip, the smaller CD4555 the Secondary chip.

The TI-53 calculator makes use of the original TP0323 microcomputer 
introduced already in 1978.

If you have additions to the above article please email:

Joerg Woerner, June 13, 2003. No reprints without written permission.