};// TODO handle that in Instruc...

    public static Action ret(CPU cpu, FlagCondition o) =>
      () => {
        if (o.Target) {
          cpu.Return();
          cpu.pc -= 1;
        }
      };
 public static Action ret(CPU cpu) =>
   () => {
     cpu.Return();
     cpu.pc -= 1;
   };// TODO handle that in Instruc...