Why isn't your output displayed on the screen?

After you type a command and press <Enter>, the status of your session is displayed in the lower right-hand corner of your screen as RUNNING. After a short time, the status indicator automatically changes to INPUT; this means the shell session is ready for input and will not send any more output or messages to the display screen.

At times you may find that the status indicator changes to INPUT before you have received any or all of your output. Don't worry—the shell is producing output and storing it in a buffer. Just press the Refresh function key and the shell will display more output on your screen. (If you don't have a Refresh function key, you can press a <Clear> key, <PA2>, or <PA3>.)

The reason for this behavior is that TSO/VTAM provides no way to wait for keyboard input and TTY output at the same time under TSO.

On the z/OS UNIX System Services Web site, there is some code (poll.c) that lets an OMVS user remain in RUNNING mode indefinitely. This improves usability, but it can have a significant performance impact if many people use it. You can download the code by going to the Tips section:

http://www-03.ibm.com/systems/z/os/zos/features/unix/