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Additional Pictures 

 

Both variants of the SR-56 side by side.  

The printed circuit boards of the two SR-56 are identical. 

The main electronics of the SR-56 consists of the Arithmetic chip TMC0501, two Read-Only 
Memories with the software TMC0537 and TMC0538 and one Read/Write Memory TMC0599,
Please notice the production date of the TMC0537 chip - week 11 year 1976.  

This late SR-56 was manufactured in June 1977, some weeks after the introduction
of the TI-57, TI-58 and TI-59.


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

Francis Martin, Stephan Feinen and Joerg Woerner, July 5, 2002. No reprints without written permission.