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Carry is set by left- or right-most bits
Don't rely on modify_status() to get it right.
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@ -142,11 +142,13 @@ DEFINE_INST(rol)
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carry = 1;
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}
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cpu->P &= ~MOS_CARRY;
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if (carry) {
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result |= 0x01;
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cpu->P |= MOS_CARRY;
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}
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mos6502_modify_status(cpu, MOS_NZC, oper, result);
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mos6502_modify_status(cpu, MOS_NZ, oper, result);
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if (cpu->eff_addr) {
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mos6502_set(cpu, cpu->eff_addr, result & 0xff);
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@ -168,11 +170,13 @@ DEFINE_INST(ror)
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carry = 1;
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}
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cpu->P &= ~MOS_CARRY;
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if (carry) {
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result |= 0x80;
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cpu->P |= MOS_CARRY;
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}
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mos6502_modify_status(cpu, MOS_NZC, oper, result);
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mos6502_modify_status(cpu, MOS_NZ, oper, result);
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if (cpu->eff_addr) {
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mos6502_set(cpu, cpu->eff_addr, result & 0xff);
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