Additional Pictures 


The internal construction of the EL-503 mixes different technologies,
 a rigid printed circuit board (PCB) for the calculator circuit and a
flexible circuit for the keyboard assembly.

The TP0327 single-chip calculator circuit is based on the
famous TMS1000 microcomputer family.

horizontal rule

If you have additions to the above article please email:

Joerg Woerner, November 3, 2008. No reprints without written permission.