Just a comment about TRTR. If your code must execute on any system other than your own, such as a vender, which I am. Be careful using the TRTR instruction (and many others).
The POO book says you will receive an operation exception if the extended-translation facility 3 is not installed. This happen to one of my customers and I had to modify the code to use the CLI loop instead of using the TRTR instruction. Before using any fancy instruction, be sure that it does not require an extended processor; otherwise you may be in for some trouble down the road. Larry
