public override ExecutionResult ExecuteInstruction(MmixComputer mmixComputer, Tetra tetra)
{
mmixComputer.rBB = mmixComputer.Registers[255];
// TODO there is a lot more to be understood here - http://mmix.cs.hm.edu/doc/instructions-en.html#TRAP
// for now, XYZ == 0 terminates the program.
if (tetra.Y == Constants.Fputs && tetra.Z == 1)
{
// get pointer from $255
var address = mmixComputer.Registers[255].ToLong();
byte letter;
var letters = new List <byte>();
do
{
letter = mmixComputer.Memory[address];
letters.Add(letter);
address++;
} while (letter != 0x00);
Console.Write(Encoding.ASCII.GetString(letters.ToArray()));
}
if (tetra.ToInt() == 0)
{
return(ExecutionResult.HALTED);
}
return(ExecutionResult.CONTINUE);
}