diff options
| author | Ian C <ianc@noddybox.co.uk> | 2021-08-24 22:11:02 +0000 |
|---|---|---|
| committer | Ian C <ianc@noddybox.co.uk> | 2021-08-24 22:11:02 +0000 |
| commit | 799e5f977ef34218e3e5c817ae5f5a571ac4c930 (patch) | |
| tree | 1389178d1ce5655a08137c2bcf7bba9816edfed8 /z80_decode.c | |
| parent | e584ad6f47489504bcdb8889645ab32121ae5197 (diff) | |
Fixed SCF, CCF and DAA so they pass documented flag tests.
Diffstat (limited to 'z80_decode.c')
| -rw-r--r-- | z80_decode.c | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/z80_decode.c b/z80_decode.c index c642783..e19f593 100644 --- a/z80_decode.c +++ b/z80_decode.c @@ -963,35 +963,36 @@ do { \ static void DAA (Z80 *cpu) { Z80Byte add=0; - Z80Byte carry=0; + Z80Byte carry=cpu->AF.b.lo&C_Z80; Z80Byte nf=cpu->AF.b.lo&N_Z80; Z80Byte acc=cpu->AF.b.hi; - if (acc>0x99 || IS_C) + if (acc > 0x99 || IS_C) { add|=0x60; - carry=C_Z80; + + if (acc > 0x99) + { + carry=C_Z80; + } } - if ((acc&0xf)>0x9 || IS_H) + if ((acc&0xf) > 0x9 || IS_H) { add|=0x06; } if (nf) { - cpu->AF.b.hi-=add; + SUB8(add); } else { - cpu->AF.b.hi+=add; + ADD8(add); } - cpu->AF.b.lo=PSZtable[cpu->AF.b.hi] - | carry - | nf - | ((acc^cpu->AF.b.hi)&H_Z80) - | (cpu->AF.b.hi&(B3_Z80|B5_Z80)); + cpu->AF.b.lo = (cpu->AF.b.lo & ~(C_Z80|P_Z80)) | carry | + Ptable[cpu->AF.b.hi]; } /* ---------------------------------------- HANDLERS FOR ED OPCODES @@ -2053,7 +2054,7 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode) case 0x37: /* SCF */ TSTATE(4); - cpu->AF.b.lo=(cpu->AF.b.lo&(S_Z80|Z_Z80|P_Z80)) + cpu->AF.b.lo=(cpu->AF.b.lo&(S_Z80|Z_Z80|P_Z80)) | C_Z80 | (cpu->AF.b.hi&(B3_Z80|B5_Z80)); break; @@ -2095,6 +2096,8 @@ void Z80_Decode(Z80 *cpu, Z80Byte opcode) case 0x3f: /* CCF */ TSTATE(4); + CLRFLAG(N_Z80); + if (CARRY) SETFLAG(H_Z80); else |