public void Signed_8bit()
{
TestContext.WriteLine("signed 8bit");
var val0 = (sbyte)cpu.signed(0);
var val7f = (sbyte)cpu.signed(0x7F);
var val80 = (sbyte)cpu.signed(0x80);
var valff = (sbyte)cpu.signed(0xFF);
//ushort valUndef = cpu.signed();
Assert.That(val0, Is.EqualTo(0));
Assert.That(val7f, Is.EqualTo(0x7f));
Assert.That(val80, Is.EqualTo(-128));
Assert.That(valff, Is.EqualTo(-1));
//Assert.That(valUndef, Is.EqualTo(undefined));
}