More Successful Z80 Derivatives (from Zilog)
Apart from the successful Z180 (developed largely by Hitachi) other attempts were made to extend the Z80 architecture, the 32-bit Z380 (introduced 1994) was a commercial disappointment but is still in production for some specific telecom applications. On the other hand, the fast 24-bit eZ80 (introduced 2001) has been both commercially successful and won engineering awards. It may be interesting to note that, unlike the Z800, Z280, and Z380, the eZ80 does not introduce many new instruction or addressing modes, but merely extends the 16-bit registers of the Z80 into 24 bits, enabling it to reach 256 times as much memory while its fully pipelined execution unit executes Z80 instructions four times as fast as the original.
Read more about this topic: Zilog Z800
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