Notes:
* The opcode ED70 reads the port indicated by the register C without keeping the result , but it modifies the register F
* The opcode ED71 is used in many PSG players/drivers, as it's very useful for the [[PSG]] access, which sits behind the [[8255|PPI]]. But beware, on a CMOS Z80 this opcode behaves differently. It corresponds to the instruction OUT (C),#FF instead [https://www.cpcwiki.eu/forum/software-related/what-software-requires-c3-ram-banking/msg246687/#msg246687 Source]
* 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]