On Iau, 2003-08-07 at 23:49, Fargusson.Alan wrote: > Did you mean 2-3 clocks? It wasn't anything near 23 clocks on the Z80s I used. > > I am fairly sure that there was a one byte prefix to specify the index register.
1 byte for the prefix (DD/FD) then byte 3 is the offset (so 2 bytes added). I may be out on the timing for a load a, (ix+n) since this is from memory (although I'm alarmed how many op codes I can remember still 8))
