It's a midrange machine. Very good at COBOL and RPG. As a relational database that is tightly coupled with the OS. I'm not sure on the model numbers, but if it is in a white/beige box it's an old timer. The latest version of the OS is V3R2, dating back to about 1996. Black boxes mean it is a newer RISC processor model, although there were some previous generation boxes dressed up in black to make them sexy. :-) Peripherals and I/O on these things are weird. It's like working in a parallel universe. Read on the web for the gory details. If the box is newer, there is a good chance that some of my code is running on it in the bowels of the OS. Mike