public void TestADD()
{
cpu.SetPC(4);
cpu.SetDataRegisterByte(0, 0x40);
cpu.SetDataRegisterByte(1, 0x80);
bus.WriteWord(4, 0xd001); // add.b d1,d0
int ticks = cpu.Execute();
Assert.Equal(6, cpu.GetPC());
Assert.Equal(0xc0, cpu.GetDataRegisterByte(0));
Assert.Equal(0x80, cpu.GetDataRegisterByte(1));
Assert.Equal(4, ticks);
Assert.False(cpu.IsFlagSet(cpu.CFlag));
Assert.False(cpu.IsFlagSet(cpu.VFlag));
Assert.False(cpu.IsFlagSet(cpu.ZFlag));
Assert.True(cpu.IsFlagSet(cpu.NFlag));
Assert.False(cpu.IsFlagSet(cpu.XFlag));
cpu.SetPC(4);
cpu.SetDataRegisterWord(0, 0x8000);
cpu.SetDataRegisterWord(1, 0x8500);
bus.WriteWord(4, 0xd041); // add.w d1,d0
ticks = cpu.Execute();
Assert.Equal(6, cpu.GetPC());
Assert.Equal(0x0500, cpu.GetDataRegisterWord(0));
Assert.Equal(0x8500, cpu.GetDataRegisterWord(1));
Assert.Equal(4, ticks);
Assert.True(cpu.IsFlagSet(cpu.CFlag));
Assert.True(cpu.IsFlagSet(cpu.VFlag));
Assert.False(cpu.IsFlagSet(cpu.ZFlag));
Assert.False(cpu.IsFlagSet(cpu.NFlag));
Assert.True(cpu.IsFlagSet(cpu.XFlag));
cpu.SetPC(4);
cpu.SetDataRegisterLong(0, -4);
cpu.SetDataRegisterLong(1, 0x04);
bus.WriteWord(4, 0xd081); // add.l d1,d0
ticks = cpu.Execute();
Assert.Equal(6, cpu.GetPC());
Assert.Equal(0, cpu.GetDataRegisterLong(0));
Assert.Equal(0x04, cpu.GetDataRegisterWord(1));
Assert.Equal(6, ticks);
Assert.True(cpu.IsFlagSet(cpu.CFlag));
Assert.False(cpu.IsFlagSet(cpu.VFlag));
Assert.True(cpu.IsFlagSet(cpu.ZFlag));
Assert.False(cpu.IsFlagSet(cpu.NFlag));
Assert.True(cpu.IsFlagSet(cpu.XFlag));
}
private void TestSUBByteZeroFlag(MC68000 cpu, bool expectedZFlag, long d2_pre, long d2_post)
{
cpu.SetPC(4);
cpu.SetDataRegisterLong(2, (int)d2_pre);
cpu.Execute();
Assert.Equal(d2_post, cpu.GetDataRegisterLong(2));
Assert.Equal(0x00, cpu.GetDataRegisterByte(2));
Assert.Equal(expectedZFlag, cpu.IsFlagSet(cpu.ZFlag));
}