Additional Pictures 


This SR-50A (Version 1) was manufactured in May 1976 by
Texas Instruments in Rieti, Italy (Date code 2276 wk 22 yr 1976).

The battery compartment of the SR-50A.

The Main printed circuit board (PCB) of the SR-50A calculator is centered around the
TMC0501 and TMC0521 chips supported by many discrete components.

Close-up view of the TMC0501 Arithmetic Chip.

Close-up view of the TMC0521 Scanning and Read-Only Memory Chip.

Close-up view of the SN97227 Clock Generator Chip.

Close-up view of the TP4011A Clock Driver Chip.

Close-up view of one of the two SN27882 Display Driver Chips.

horizontal rule

If you have additions to the above article please email:

Joerg Woerner, January 6, 2024. No reprints without written permission.