public void UnregisterAllInterruptSources()
{
foreach (var source in InterruptSources)
{
source.NmiInterruptPulse -= (sender, args) => NmiInterruptPending = true;
}
InterruptSources.Clear();
}
private int AcceptPendingInterrupt()
{
if (executionContext.IsEiOrDiInstruction)
{
return(0);
}
if (NmiInterruptPending)
{
IsHalted = false;
Registers.IFF1 = 0;
this.ExecuteCall(NmiServiceRoutine);
return(11);
}
if (!InterruptsEnabled)
{
return(0);
}
var activeIntSource = InterruptSources.FirstOrDefault(s => s.IntLineIsActive);
if (activeIntSource == null)
{
return(0);
}
Registers.IFF1 = 0;
Registers.IFF2 = 0;
IsHalted = false;
switch (InterruptMode)
{
case 0:
var opcode = activeIntSource.ValueOnDataBus.GetValueOrDefault(0xFF);
InstructionExecutor.Execute(opcode);
return(13);
case 1:
InstructionExecutor.Execute(RST38h_opcode);
return(13);
case 2:
var pointerAddress = NumberUtils.CreateShort(
lowByte: activeIntSource.ValueOnDataBus.GetValueOrDefault(0xFF),
highByte: Registers.I);
var callAddress = NumberUtils.CreateShort(
lowByte: Memory[pointerAddress],
highByte: Memory[pointerAddress.Inc()]);
this.ExecuteCall(callAddress.ToUShort());
return(19);
}
return(0);
}
public IEnumerable <IZ80InterruptSource> GetRegisteredInterruptSources()
{
return(InterruptSources.ToArray());
}
