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Fix Phasor's Echo+ mode's dual chip-select (#1183)
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@ -196,19 +196,32 @@ void MockingboardCard::WriteToORB(BYTE subunit)
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#else
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#else
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if (m_phasorEnable)
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if (m_phasorEnable)
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{
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{
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const int kAY0 = 2; // bit4=0 (active low) selects the 1st AY8913, ie. the only AY8913 in Mockingboard mode (confirmed on real Phasor h/w)
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const int kAY0 = 2; // Phasor mode: bit4=0 (active low) selects the 1st AY8913, ie. the only AY8913 in Mockingboard mode (confirmed on real Phasor h/w)
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const int kAY1 = 1; // bit3=0 (active low) selects the 2nd AY8913 attached to this 6522 (unavailable in Mockingboard mode)
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// Echo+ mode: bit4=1 (active high) selects the 2nd AY8913
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const int nAY_CS = (m_phasorMode == PH_Mockingboard) ? kAY0 : (~(value >> 3) & 3);
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const int kAY1 = 1; // Phasor mode: bit3=0 (active low) selects the 2nd AY8913 attached to this 6522 (unavailable in Mockingboard mode)
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// Echo+ mode: bit3=1 (active high) selects the 1st AY8913
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const int nAY_CS = (m_phasorMode == PH_EchoPlus) ? ((value >> 3) & 3)
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: (m_phasorMode == PH_Phasor) ? (~(value >> 3) & 3)
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: kAY0; // Anything else is Mockingboard
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if (m_phasorMode == PH_EchoPlus)
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if (m_phasorMode == PH_EchoPlus)
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{
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subunit = SY6522_DEVICE_B;
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subunit = SY6522_DEVICE_B;
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if (nAY_CS & kAY0)
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AY8910_Write(subunit, AY8913_DEVICE_B, value);
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if (nAY_CS & kAY1)
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AY8910_Write(subunit, AY8913_DEVICE_A, value);
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}
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else
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{
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if (nAY_CS & kAY0)
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if (nAY_CS & kAY0)
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AY8910_Write(subunit, AY8913_DEVICE_A, value);
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AY8910_Write(subunit, AY8913_DEVICE_A, value);
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if (nAY_CS & kAY1)
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if (nAY_CS & kAY1)
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AY8910_Write(subunit, AY8913_DEVICE_B, value);
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AY8910_Write(subunit, AY8913_DEVICE_B, value);
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}
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}
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}
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else
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else
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{
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{
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AY8910_Write(subunit, AY8913_DEVICE_A, value);
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AY8910_Write(subunit, AY8913_DEVICE_A, value);
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