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byuu says: This is a really tiny WIP. Just wanted to add the known fixes before I start debugging it against Mednafen in a fork. Changelog: - Z80: fixed flag calculations on 8-bit ADC, ADD, SBC, SUB - Z80: fixed flag calculations on 16-bit ADD - Z80: simplified DAA logic \[AWJ\] - Z80: RETI sets IFF1=IFF2 (same as RETN)