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Fixed AF calculation in mcs48.

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This commit is contained in:
Aaron Giles 2008-09-24 15:54:13 +00:00
parent 60fd22db00
commit fad77cb08e
1 changed files with 4 additions and 2 deletions
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6
src/emu/cpu/mcs48/mcs48.c
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@ -276,9 +276,10 @@ INLINE void pull_pc(void)
INLINE void execute_add(UINT8 dat) INLINE void execute_add(UINT8 dat)
{ {
UINT16 temp = A + dat; UINT16 temp = A + dat;
UINT16 temp4 = (A & 0x0f) + (dat & 0x0f);
PSW &= ~(C_FLAG | A_FLAG); PSW &= ~(C_FLAG | A_FLAG);
PSW |= ((A ^ temp) << 2) & A_FLAG; PSW |= (temp4 << 2) & A_FLAG;
PSW |= (temp >> 1) & C_FLAG; PSW |= (temp >> 1) & C_FLAG;
A = temp; A = temp;
} }
@ -292,9 +293,10 @@ INLINE void execute_add(UINT8 dat)
INLINE void execute_addc(UINT8 dat) INLINE void execute_addc(UINT8 dat)
{ {
UINT16 temp = A + dat + CARRYIN; UINT16 temp = A + dat + CARRYIN;
UINT16 temp4 = (A & 0x0f) + (dat & 0x0f) + CARRYIN;
PSW &= ~(C_FLAG | A_FLAG); PSW &= ~(C_FLAG | A_FLAG);
PSW |= ((A ^ temp) << 2) & A_FLAG; PSW |= (temp4 << 2) & A_FLAG;
PSW |= (temp >> 1) & C_FLAG; PSW |= (temp >> 1) & C_FLAG;
A = temp; A = temp;
} }