Changes
/* Z80: ED B9 cpd(r) / ED B1 cpi(r) */
Solved by Sorgelig (does not run in r005.8.16.2 but does pass on Sorgelig MiSTer version)
In fact it is more difficult instruction that I was thinking, if you watch at it, it shall take only 4 NOPs maximum but in plustest.dsk it does take 6/4 NOPs. In fact C9 RET seem also used here, as sub instruction. Do remark that CPD and CPI does take 4 NOPs, so here CPDR/CPIR does not has same implementation than CPD/CPI.
==== Z80: TODO : cpc-power testbench ====
