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Additional Pictures 

 

Close-up view of the TP0456/CD4555 single-chip calculator circuit used with the TI-55-II as Slave processor.
CMOS Technology, 28-pin SPDIP 4-bit Microcontroller, 2,048*9 Bits Instruction ROM, 128*4 Bits Data RAM, 64 Bits Display Register.

Die Photo of the TP0456/CD4555 courtesy of Sean Riddle.

Die Photo (after acid) of the TP0456/CD4555 courtesy of Sean Riddle.

Close-up view of the TP0456/CD4556 single-chip calculator circuit used with the TI-55-II as Master processor.
CMOS Technology, 40-pin SPDIP 4-bit Microcontroller, 2,048*9 Bits Instruction ROM, 128*4 Bits Data RAM, 64 Bits Display Register.

Die Photo of the TP0456/CD4556 courtesy of Sean Riddle.

Die Photo (after acid) of the TP0456/CD4556 courtesy of Sean Riddle.

Close-up view of the TP0456/CD4571 single-chip calculator circuit used with the TI BA-35.
CMOS Technology, 28-pin SPDIP 4-bit Microcontroller, 2,048*9 Bits Instruction ROM, 128*4 Bits Data RAM, 64 Bits Display Register.

Die Photo of the TP0456A/CD4571 courtesy of Sean Riddle.

Die Photo (after acid) of the TP0456A/CD4571 courtesy of Sean Riddle.


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

Joerg Woerner, January 28, 2021. No reprints without written permission.