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Additional Pictures 

 

Close-up view of the TMC0981 single-chip calculator circuit used with the TI-30 and SR-40.
PMOS Technology, 28-pin SPDIP 4-bit Microcontroller, 2,048*9 Bits Instruction ROM, 144*4 Bits Data RAM.

Die Photo of the TMC0980/TMC0981 courtesy of Sean Riddle.

Die Photo (after acid) of the TMC0980/TMC0981 courtesy of Sean Riddle.


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

Joerg Woerner, January 9, 2021. No reprints without written permission.