private void StartFetch()
{
_state = new CpuFetch(_cpu);
_currentState = CpuStates.Fetch;
_opcodeBuilder.Clear();
_cycles.Reset();
}
private bool AcceptInterrupt()
{
var interrupt = _interruptManager.PopInterrupt();
if (interrupt != null)
{
_state = interrupt;
_currentState = CpuStates.Interrupt;
// prep engine state
_opcodeBuilder.Clear();
_cycles.Reset();
_cycles.OpcodeDefinition = interrupt.Definition;
return(true);
}
return(false);
}
private bool ContinueFetch()
{
if (_cycles.IsLastCycle &&
_cycles.OpcodeDefinition == null)
{
if (_opcodeBuilder.HasReversedOffsetParameterOrder)
{
_state = new CpuReadParameterThenExecute(_cpu);
_currentState = CpuStates.Execute;
_cycles.Continue(3);
}
else
{
_state = new CpuFetch(_cpu);
_cycles.Continue();
}
return(true);
}
return(false);
}
private void StartExecute()
{
_state = new CpuExecute(_cpu);
_currentState = CpuStates.Execute;
}
