[1] : The Free On-line Dictionary of Computing (27 SEP 03)

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.
     
        1994-10-31
     
     
see also:
zilog z80 mmu multitasking cache op code 

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