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
central processing unit (CPU), 6820/21
Peripheral Interface Adapter (PIA), 6850 Asynchronous Communications Interface Adapter (ACIA), and 6860
modem chip. He was the sole IC design engineer of the 6820/21 PIA, which was the first peripheral IC to have
bit-programmable
input/output (I/O).''«He built seven different chips without ever having an error, almost all done by hand. When I tell people that, they don't believe me, but it's true. This guy is a unique person. He is the best layout guy in the world.»''Before leaving MOS Technology in 1977, Mensch became their microprocessor design manager. ==Western Design Center==