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Additional Pictures 

 

Close-up view of the TMS1071 single-chip calculator circuit used with the TI-2550 II.
PMOS Technology, 28-pin DIP 4-bit Microcontroller, 1,024*8 Bits Instruction ROM, 64*4 Bits Data RAM.

Die Photo of the TMS1071 courtesy of Sean Riddle.

Close-up view of the TMC1079 single-chip calculator circuit used with the Canon MD-8.
PMOS Technology, 28-pin SPDIP 4-bit Microcontroller, 1,024*8 Bits Instruction ROM, 64*4 Bits Data RAM.

Die Photo (after acid) of the TMC1079 courtesy of Sean Riddle.


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

Joerg Woerner, December 22, 2022. No reprints without written permission.