* In the instruction EX DE,HL, HL will not be replaced with IX or IY
* If (HL) and L or H are used in the same instruction, L and H are not replaced with IXL or IXH. For instance LD L,(IX+d) stores the content of (IX+d) into L, not IXL
* The ED prefix cancels If the effects of preceding next byte is a DD , ED or FD prefixesprefix, so sequences of the current DD ED op or FD ED op execute as regular ED op.prefix is ignored (it's equivalent to a NONI) and processing continues with the next byte
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