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Additional Pictures 

 

This SR-51 (Second Design) was manufactured in May 1975 by
Texas Instruments in Dallas, TX (Date code 205 » wk 20 yr 1975).

The battery compartment of the SR-51 gives access to the electrical
contacts used to connect the PC-100 printer cradle.

The Main printed circuit board (PCB) of the SR-51 calculator. The brain of the
calculator uses the TMC0501 and a stack of 2 SCOM (TMC0522,523) circuits. 
A second PCB holds the keys, display and driver circuits.

The Display and Keyboard PCB of the SR-51 with two Texas Instruments
SN27882 display drivers and fourteen 7-segment LED-Displays. 

Close-up view of the TMC0501 Arithmetic Chip.

Close-up view of the TMC0522/TMC0523 Scanning and Read-Only Memory Chips.

Close-up view of the SN74LS74 Chip from the Clock Generator.

 
Close-up view of the SN74LS02 Chip from the Clock Generator.

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

Close-up of the 14-digit LED Display with magnifying lens.


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

© Joerg Woerner, January 21, 2024. No reprints without written permission.