![]() ![]() The attempt by General Microelectronics in 1965 to develop a set of 23 custom integrated circuits for an electronic calculator for Victor Comptometer proved to be too ambitious given the reliability of PMOS circuits at the time and ultimately led to the demise of General Microelectronics. General Microelectronics introduced the first commercial PMOS circuit in 1964, a 20-bit shift register with 120 MOSFETs – at the time an incredible level of integration. The high threshold voltage of early MOSFETs led to a higher minimum power-supply voltage (-24 V to -28 V ). ![]()
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