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Updated Z80 CPU to fix interrupts etc...

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This commit is contained in:
Marc Parsons
2026-05-26 22:02:47 +01:00
parent b5695b5c2f
commit ce46e7ed52
6 changed files with 121 additions and 47 deletions
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19
Core/SmsMachine.cs
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@@ -17,6 +17,7 @@ namespace Core
public SmsVdp VideoProcessor { get; private set; }
public SmsApu AudioProcessor { get; private set; }
public ushort? Breakpoint { get; set; } = null;
private int _tStateCarryover = 0;
// NTSC SMS T-States per frame
public const int TStatesPerFrame = 59736; //NTSC
@@ -40,13 +41,15 @@ namespace Core
public void Reset()
{
MemoryBus.CleanRAMData();
VideoProcessor.Reset();
Cpu.Reset();
_tStateCarryover = 0;
}
public void RunFrame()
{
int tStatesThisFrame = 0;
int tStatesThisFrame = _tStateCarryover;
while (tStatesThisFrame < TStatesPerFrame) // Standard NTSC frame time
{
// 1. Run one CPU instruction
@@ -58,12 +61,16 @@ namespace Core
AudioProcessor.Update(cycles);
// 3. Check if the VDP is begging for attention!
if (VideoProcessor.InterruptPending && Cpu.IFF1)
//if (VideoProcessor.InterruptPending && Cpu.IFF1)
if (VideoProcessor.InterruptPending)
{
int intCycles = Cpu.RequestInterrupt();
tStatesThisFrame += intCycles;
VideoProcessor.Update(intCycles);
AudioProcessor.Update(intCycles);
if (intCycles > 0)
{
tStatesThisFrame += intCycles;
VideoProcessor.Update(intCycles);
AudioProcessor.Update(intCycles);
}
}
// 4. THE RESTORED BREAKPOINT TRAP