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Additional Pictures 

 

Close-up view of the MS5021C single-chip calculator circuit as used with the Interton VIP 10.
PMOS Technology, 28-pin Ceramic DIP 4-bit serial Register Processor, 384*11 Bits Instruction ROM, 12*14 Bits Data SAM. Chip manufactured February 1974.



Die Photo of the MK5020/5021C courtesy of Sean Riddle.


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

© Joerg Woerner, June 28, 2026. No reprints without written permission.