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 for ZILOG Z280
From The Free On-line Dictionary of Computing (30 December 2018) :

  Zilog Z280
     An enhanced version of the Zilog Z80 with a 16 bit
     architecture, introduced in July, 1987.  It added an MMU to
     expand addressing to 16Mb, features for multitasking, a 256
     byte cache, and a huge number of new op codes (giving a
     total of over 2000!).  Its internal clock runs at 2 or 4 times
     the external clock (e.g. a 16MHz CPU with a 4MHz bus).

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