public void Nmi_resets_IFF1()
{
Sut.RegisterInterruptSource(InterruptSource1);
Sut.Memory[0] = NOP_opcode;
Sut.Memory[1] = RET_opcode;
Sut.Memory[0x66] = RET_opcode;
bool nmiFired = false;
Sut.Reset();
Sut.Registers.IFF1 = 1;
Sut.AutoStopOnRetWithStackEmpty = true;
Sut.BeforeInstructionFetch +=
(sender, args) =>
{
if (!nmiFired)
{
InterruptSource1.FireNmi();
nmiFired = true;
}
};
Sut.Continue();
Assert.True(nmiFired);
Assert.AreEqual(0, Sut.Registers.IFF1);
}
public void Halted_processor_awakes_on_interrupt(bool isNmi)
{
Sut.RegisterInterruptSource(InterruptSource1);
Sut.Memory[0] = NOP_opcode;
Sut.Memory[1] = HALT_opcode;
Sut.Memory[2] = RET_opcode;
Sut.Memory[3] = RET_opcode;
Sut.Memory[0x66] = RET_opcode;
Sut.Memory[0x38] = RET_opcode;
Sut.AutoStopOnDiPlusHalt = false;
Sut.AutoStopOnRetWithStackEmpty = true;
Sut.Reset();
Sut.Registers.IFF1 = 1;
Sut.InterruptMode = 1;
var instructionsExecutedCount = 0;
Sut.BeforeInstructionFetch +=
(sender, args) =>
{
if (instructionsExecutedCount == 10)
{
if (isNmi)
{
InterruptSource1.FireNmi();
}
else
{
InterruptSource1.IntLineIsActive = true;
}
}
if (instructionsExecutedCount == 15)
{
args.ExecutionStopper.Stop();
}
else
{
instructionsExecutedCount++;
}
};
Sut.Continue();
Assert.False(Sut.IsHalted);
Assert.AreEqual(13, instructionsExecutedCount); //10 + extra NOP + RET on 0x66 + RET on 2
Assert.AreEqual(StopReason.RetWithStackEmpty, Sut.StopReason);
}
public void Nmi_is_not_accepted_after_EI_or_DI(byte opcode)
{
Sut.RegisterInterruptSource(InterruptSource1);
Sut.Memory[0] = opcode;
Sut.Memory[1] = RET_opcode;
Sut.Memory[0x66] = RET_opcode;
bool nmiFired = false;
bool serviceRoutineInvoked = false;
Sut.Reset();
Sut.Registers.IFF1 = 1;
Sut.AutoStopOnRetWithStackEmpty = true;
Sut.BeforeInstructionFetch +=
(sender, args) =>
{
if (!nmiFired)
{
InterruptSource1.FireNmi();
nmiFired = true;
}
if (Sut.Registers.PC == 0x66)
{
serviceRoutineInvoked = true;
}
if (Sut.Registers.PC == 1)
{
args.ExecutionStopper.Stop();
}
};
Sut.Continue();
Assert.True(nmiFired);
Assert.False(serviceRoutineInvoked);
}
public void Nmi_is_accepted_after_instruction_execution()
{
Sut.RegisterInterruptSource(InterruptSource1);
Sut.Memory[0] = NOP_opcode;
Sut.Memory[1] = RET_opcode;
Sut.Memory[0x66] = RET_opcode;
bool nmiFired = false;
bool serviceRoutineInvoked = false;
bool serviceRoutineReturned = false;
Sut.AutoStopOnRetWithStackEmpty = true;
Sut.BeforeInstructionFetch +=
(sender, args) =>
{
if (!nmiFired)
{
InterruptSource1.FireNmi();
nmiFired = true;
}
if (Sut.Registers.PC == 1)
{
serviceRoutineReturned = true;
}
if (Sut.Registers.PC == 0x66)
{
serviceRoutineInvoked = true;
}
};
Sut.Start();
Assert.True(serviceRoutineInvoked);
Assert.True(serviceRoutineReturned);
}
