The Clipper architecture was originally developed at Fairchild Semiconductor in Oct. 1985, and began shipping in 1986. It is implemented in a three chip module consisting of a microprocessor chip and two cache and memory management (CAMMU) chips, mounted on a small PC board.
The architecture was acquired by Intergraph Corporation in 1987.
References:
Instruction Set and Processor Implementation [pdf]
Memory Architecture, Cache and MMU [pdf]