Originally posted by: dman6666
I suspect you are running CM/2 (or whatever the current incarnation is) which is a Host Emulator to allow you to communicate with some OS/390 mainframes. I don't believe that OS/390 runs on top of OS/2 on intel platform.
On one machine, OS/390 is run on a card in the machine. The machine itself is a PII that boots into OS/2, then you start up the mainframe from there, and it runs inside a window within OS/2. You can interact with OS/2 while the mainframe is running. It is what they called a unified server, as you could use the OS/2 side as a server while the machine was also acting as a mainframe.
Now that I think about it, we have a newer OS/390 system that is different, and it might not actually boot to OS/2. I am not positive on this one. It is a similary setup, though, as it has an Intel chip that boots the machine into some OS, then the mainframe gets fired up from there. These are low-end mainframes as we are a software development shop and don't use the mainframes for any actual work, just compiling and testing.