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Additional Pictures 

 

This SR-56 (Pre-Launch) was manufactured in January 1976 by
Texas Instruments in Dallas, Texas (Date code 0476 DTA wk 04 yr 1976).

The battery compartment of the SR-56.

The Main printed circuit board (PCB) of the SR-56 calculator is centered around the
TMC0501, TMC0537/0538 and TMC0599 Chips supported by only few discrete components.

The rear side of the SR-56 PCB with the Display Module and Keyboard assembly.

Close-up view of the TMC0501 Arithmetic Chip.

Close-up view of the TMC0537 Scanning and Read-Only Memory Chip.

Close-up view of the TMC0538 Scanning and Read-Only Memory Chip.

Close-up view of the TMC0599 Multi-Register Chip.

Close-up view of one of the two SN97311 Display Driver Chips.


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

Joerg Woerner, January 13, 2024. No reprints without written permission.