Changes
Z80
,/* DD or FD-prefixed opcodes */
Same for the FD prefix but with IY instead of IX.
There are 2 exceptions to these rules:
* The instruction EX DE,HL is not affected by these prefixes and execute as usual
* The ED prefix cancels the effects of preceding DD or FD prefixes, so sequences of DD ED op or FD ED op execute as regular ED op.
