private void ExecuteSystem()
{
Via0.Ca1 = ViaReadAtn();
Via0.ExecutePhase();
Via1.ExecutePhase();
// SO pin pipeline
if ((_overflowFlagDelaySr & 0x01) != 0)
{
_cpu.SetOverflow();
}
_overflowFlagDelaySr >>= 1;
_cpu.IRQ = !(Via0.Irq && Via1.Irq); // active low IRQ line
_cpu.ExecuteOne();
if (_ledEnabled)
{
_driveLightOffTime = 25000;
}
else if (_driveLightOffTime > 0)
{
_driveLightOffTime--;
}
}
private void ExecutePhaseInternal()
{
Via0.Ca1 = ViaReadAtn();
// clock output from 325572-01 drives CPU clock (phi0)
ExecuteMotor();
ExecuteFlux();
Via0.ExecutePhase();
Via1.ExecutePhase();
// SO pin pipeline
if ((_overflowFlagDelaySr & 0x01) != 0)
{
_cpu.SetOverflow();
}
_overflowFlagDelaySr >>= 1;
_cpu.IRQ = !(Via0.Irq && Via1.Irq); // active low IRQ line
_cpu.ExecuteOne();
_via0PortBtemp = Via0.EffectivePrB;
_ledEnabled = (_via0PortBtemp & 0x08) != 0;
if (_ledEnabled)
{
_driveLightOffTime = 1000000;
}
else if (_driveLightOffTime > 0)
{
_driveLightOffTime--;
}
}