National Semiconductor SC/MP
The SC/MP from National Semiconductor is an early microprocessor, which became available in early 1974. The name SC/MP (pronounced "Scamp") is an acronym for: "Simple Cost-effective Micro Processor".
It features a 16-bit address and an 8-bit data bus. The program counter will roll-over on 12-bits (4096), there are separate instructions to alter the program counter to set the upper 4-bits, which are subsequently output on the address bus along with status signals. This provides a memory map of 16 pages each of 4 KB. Internally it provided five registers plus the program counter, but no stack pointer.
Read more about National Semiconductor SC/MP: SC/MP Unusual Features, Implementations, Uses
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