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Additional Pictures 

 

Close-up view of the MK5012 single-chip calculator circuit sold in 1974 by Radio Shack under their Archer house brand as Type 5012, PN #276-1752.
PMOS Technology, 40-pin Ceramic DIP 1-bit serial Register Processor, Hard-wired Instructions, 2*48 Bits + 12 Bit Data SAM. Chip (7321KJX) manufactured May 1973.




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© Joerg Woerner, June 12, 2026. No reprints without written permission.