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Sound IRQs are acknowledged by writing to MIDI data port

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gm-matthew 2024-05-20 13:38:45 +01:00
parent 7b02f58694
commit 8a0bf29dd8
1 changed files with 5 additions and 4 deletions
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9
Src/Model3/Model3.cpp
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@ -1418,8 +1418,11 @@ void CModel3::Write8(UINT32 addr, UINT8 data)
// Sound Board
case 0x08:
//printf("PPC: %08X=%02X * (PC=%08X, LR=%08X)\n", addr, data, ppc_get_pc(), ppc_get_lr());
if ((addr&0xF) == 0) // MIDI data port
if ((addr & 0xF) == 0) // MIDI data port
{
SoundBoard.WriteMIDIPort(data);
IRQ.Deassert(0x40);
}
else if ((addr&0xF) == 4) // MIDI control port
midiCtrlPort = data;
break;
@ -2133,9 +2136,7 @@ void CModel3::RunMainBoardFrame(void)
// Process MIDI interrupt
IRQ.Assert(0x40);
ppc_execute(200); // give PowerPC time to acknowledge IR
IRQ.Deassert(0x40);
ppc_execute(200); // acknowledge that IRQ was deasserted (TODO: is this really needed?)
ppc_execute(400); // give PowerPC time to acknowledge IR
dispCycles -= 400;
++irqCount;