Set busState for 6522-A for AY_INACTIVE state
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16003ba507
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@ -292,6 +292,7 @@ void MockingboardCard::AY8913_Write(BYTE subunit, BYTE ay, BYTE value)
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m_regAccessedFlag = true;
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MB_SUBUNIT* pMB = &m_MBSubUnit[subunit];
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SY6522& r6522 = (QueryType() != CT_SDMusic) ? pMB->sy6522 : m_MBSubUnit[0].sy6522;
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bool busState = false; // Default: Mockingboard or Phasor(any mode) will read PortA inputs as high.
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// Determine the AY8913 inputs
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int nBDIR = (value & 2) ? 1 : 0;
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@ -317,12 +318,11 @@ void MockingboardCard::AY8913_Write(BYTE subunit, BYTE ay, BYTE value)
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case AY_READ: // 5: READ FROM PSG (need to set DDRA to input)
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{
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bool busState = true; // Initially default to true
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if (pMB->isChipSelected[ay] && pMB->isAYLatchedAddressValid[ay])
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{
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r6522.SetRegIRA(AYReadReg(subunit, ay, pMB->nAYCurrentRegister[ay]) & (r6522.GetReg(SY6522::rDDRA) ^ 0xff));
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else
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busState = false;
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busState = true;
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}
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if (m_phasorEnable && m_phasorMode == PH_Phasor) // GH#1192
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{
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@ -332,11 +332,6 @@ void MockingboardCard::AY8913_Write(BYTE subunit, BYTE ay, BYTE value)
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r6522.SetRegIRA(r6522.GetReg(SY6522::rORA) | (AYReadReg(subunit, AY8913_DEVICE_B, pMB->nAYCurrentRegister[AY8913_DEVICE_B]) & (r6522.GetReg(SY6522::rDDRA) ^ 0xff)));
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}
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}
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if (QueryType() != CT_SDMusic)
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pMB->SetBusState(busState);
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else
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m_MBSubUnit[0].SetBusState(busState);
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}
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break;
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@ -387,13 +382,10 @@ void MockingboardCard::AY8913_Write(BYTE subunit, BYTE ay, BYTE value)
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state = nAYFunc;
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if (state == AY_INACTIVE) // Mockingboard or Phasor(any mode) will read PortA inputs as high.
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{
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if (QueryType() != CT_SDMusic)
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pMB->SetBusState(false);
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else
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m_MBSubUnit[0].SetBusState(false);
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}
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if (QueryType() == CT_SDMusic)
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m_MBSubUnit[0].SetBusState(busState);
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else
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pMB->SetBusState(busState);
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}
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//-----------------------------------------------------------------------------
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