Engineering Achievements
Based on his participation in the basic circuit design, definition, and system design of the Motorola 6800 microprocessor and supporting computer chips, Mensch is a co-holder of several 6800 family patents, including the 6800 CPU, 6820/21 PIA, 6850 ACIA, and 6860 modem chip. He was the sole integrated circuit (IC) design engineer of the 6820/21 PIA, which was the first peripheral IC to have bit-programmable I/O.
Along with three other engineers at MOS Technology, Mensch holds the patent on the decimal correct circuitry in the 6502 CPU. He was responsible for the basic circuit design, transistor sizing, instruction decode logic (wishing to minimize the number of levels of logic so as to achieve higher speed operation), oscillator design and buffer design. Prior to leaving MOS Technology in 1977, Bill Mensch became the microprocessor design manager at the company.
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