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For Phasor (native/Echo+ modes) support the null AY chip-select case (for eg. mb-audit v0.9)

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tomcw 2023-02-26 21:52:46 +00:00
parent 31cb83419a
commit 9cf3d00288
1 changed files with 7 additions and 1 deletions
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8
source/Mockingboard.cpp
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@ -212,6 +212,12 @@ void MockingboardCard::WriteToORB(BYTE subunit)
if (nAY_CS & kAY1)
AY8910_Write(subunit, AY8913_DEVICE_B, value);
if (nAY_CS == 0)
{
SY6522& r6522 = m_MBSubUnit[subunit].sy6522;
r6522.SetRegORA(r6522.GetReg(SY6522::rDDRA) ^ 0xff); // direction '0' = input, and empirically it floats high (so DDRA=0x00 will read 0xFF as input)
}
}
else
{
@ -226,7 +232,7 @@ void MockingboardCard::AY8910_Write(BYTE subunit, BYTE ay, BYTE value)
{
m_regAccessedFlag = true;
MB_SUBUNIT* pMB = &m_MBSubUnit[subunit];
SY6522& r6522 = (m_phasorEnable && m_phasorMode == PH_EchoPlus) ? m_MBSubUnit[SY6522_DEVICE_B].sy6522 : pMB->sy6522;
SY6522& r6522 = pMB->sy6522;
if ((value & 4) == 0)
{