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m6809: fix overflow flag problem with SBC8 and ADC8 (nw)

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This commit is contained in:
hap 2017-10-18 20:26:20 +02:00
parent d9bc537f94
commit 81bcc067e4
1 changed files with 9 additions and 9 deletions
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8
src/devices/cpu/m6809/base6x09.ops
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@ -239,8 +239,8 @@ CMP8:
return; return;
SBC8: SBC8:
m_temp.w = (uint16_t)read_operand() + (m_cc & CC_C ? 1 : 0); m_temp.b.l = read_operand();
regop8() = set_flags(CC_NZVC, regop8(), m_temp.b.l, regop8() - m_temp.w); regop8() = set_flags(CC_NZVC, regop8(), m_temp.b.l, regop8() - m_temp.b.l - (m_cc & CC_C ? 1 : 0));
return; return;
AND8: AND8:
@ -259,8 +259,8 @@ EOR8:
return; return;
ADC8: ADC8:
m_temp.w = (uint16_t)read_operand() + (m_cc & CC_C ? 1 : 0); m_temp.b.l = read_operand();
regop8() = set_flags(add8_sets_h() ? CC_HNZVC : CC_NZVC, regop8(), m_temp.b.l, regop8() + m_temp.w); regop8() = set_flags(add8_sets_h() ? CC_HNZVC : CC_NZVC, regop8(), m_temp.b.l, regop8() + m_temp.b.l + (m_cc & CC_C ? 1 : 0));
return; return;
OR8: OR8: