* The opcode ED70 reads the port indicated by the register C without keeping the result but modifies the register F
* The opcode ED71 corresponds to the instruction OUT (C),255 on a CMOS Z80
* The opcode EDFF is used by Winape (and other emulators) to break into the debugger (a 'break opcode') [https://www.cpcwiki.eu/forum/emulators/shakerland-portal/msg244578/ Source]
=== DD or FD-prefixed opcodes ===