public void TestJZZeroEnabled()
{
SignalBus signals = new SignalBus();
FlagBus flagBus = new FlagBus();
FlagsRegister flags = new FlagsRegister(null, signals, flagBus);
flags.Value = FlagsRegister.ZERO;
Operation op = new JZ(null, signals, flags);
signals.Reset();
op.Step0();
Assert.IsTrue(signals.MI);
Assert.IsTrue(signals.CO);
signals.Reset();
op.Step1();
Assert.IsTrue(signals.RO);
Assert.IsTrue(signals.II);
Assert.IsTrue(signals.CE);
signals.Reset();
op.Step2();
Assert.IsTrue(signals.IO);
Assert.IsTrue(signals.J);
}
public void StoresFlags()
{
SignalBus signals = new SignalBus();
FlagBus flagBus = new FlagBus();
FlagsRegister flagsRegister = new FlagsRegister(null, signals, flagBus);
flagBus.Carry = true;
flagBus.Zero = true;
signals.FI = true;
flagsRegister.ReadFromBus();
Assert.AreEqual(3, flagsRegister.Value);
}
public void FlagsRegisterInputs()
{
DataBus bus = new DataBus();
FlagBus flagBus = new FlagBus();
SignalBus signals = new SignalBus();
Register flags = new FlagsRegister(bus, signals, flagBus);
flagBus.Carry = true;
flagBus.Zero = true;
signals.FI = true;
flags.ReadFromBus();
Assert.AreEqual(FlagsRegister.CARRY + FlagsRegister.ZERO, flags.Value);
}
public void SumRegisterOutputsSumOfAAndB()
{
DataBus bus = new DataBus();
SignalBus signals = new SignalBus();
FlagBus flagBus = new FlagBus();
Register a = new ARegister(bus, signals);
Register b = new BRegister(bus, signals);
Register sum = new SumRegister(a, b, bus, signals, flagBus);
a.Value = 200;
b.Value = 100;
signals.EO = true;
sum.WriteToBus();
Assert.AreEqual(44, bus.Value);
Assert.IsTrue(flagBus.Carry);
}
public void SumRegisterOutputsSubstractionOfAAndB()
{
DataBus bus = new DataBus();
SignalBus signals = new SignalBus();
FlagBus flagBus = new FlagBus();
Register a = new ARegister(bus, signals);
Register b = new BRegister(bus, signals);
Register sum = new SumRegister(a, b, bus, signals, flagBus);
a.Value = 166;
b.Value = 166;
signals.EO = true;
signals.SU = true;
sum.WriteToBus();
Assert.AreEqual(0, bus.Value);
Assert.IsTrue(flagBus.Zero);
}
public FlagsRegister(DataBus bus, SignalBus signals, FlagBus flagBus) : base(bus, signals)
{
this.flagBus = flagBus;
}
public SumRegister(Register aRegister, Register bRegister, DataBus bus, SignalBus signals, FlagBus flagBus) : base(bus, signals)
{
this.aRegister = aRegister;
this.bRegister = bRegister;
this.flagBus = flagBus;
}
