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Computing (FOLDOC) dictionary
Zilog Z280
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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).