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Zilog Z280
The Zilog Z280 was an enhancement of the Zilog Z80 architecture introduced in July 1987, basically a slighly improved CMOS version of the earlier NMOS Zilog Z800, both versions were commercial failures. They added a memory management unit (MMU) to expand the addressing range to 16 MB, features for multitasking and multiprocessor and coprocessor configurations, a 256 byte cache, and a huge number of new instructions and addressing modes (giving a total of over 2000 combinations).
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