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ZX Spectrum slaví třicáté narozeniny od ludva - jen drobnost: říkat o Z80, že je to...

Presne tak. Z80 http://en.wikipedia.org/wiki/Zilog_Z80 byl zamerne kompatibilni s instrukcni sadou 8080, ale jednalo se o jiny procesor. Mel daleko logictejsi instrukce, plus registry IX a IY a dalsi vymozenosti.

Navíc Z80 nevycházel z 8080, nýbrž z 8085. ;-)

Source Wikipedia:

1974: The Intel 8080 was the second 8-bit microprocessor designed and manufactured by Intel and was released in April 1974.
1976: The Zilog Z80 is an 8-bit microprocessor designed by Zilog and sold from July 1976 onwards.
1977: The Intel 8085 is an 8-bit microprocessor introduced by Intel in 1977. It was binary-compatible with the more-famous Intel 8080