The SC/MP from National Semiconductor was an early microprocessor, becoming available in early 1974.

It featured a 12 bit address bus and 8 bit data bus. Internally it provided five registers plus the program counter, but no stack pointer. An advanced and unusual feature for the time, was the possibility to release the busses, so that they can be shared by multiple processors.

Weblinks

• http://xgistor.ath.cx/scmp.htm More info and simulators