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Additional Pictures 

 

Close-up view of the TMC1503 single-chip calculator circuit used with the TI-55 and TI-51 III.
PMOS Technology, 28-pin DIP 4-bit serial Register Processor, 2,048*13 Bits Instruction ROM, 20*16*4 Bits Data SAM.

Die Photo of the TMC1500/TMC1503 courtesy of Sean Riddle.

Die Photo (after acid) of the TMC1500/TMC1503 courtesy of Sean Riddle.


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

Joerg Woerner, January 12, 2021. No reprints without written permission.