kulls,

I have never used the 'topas' command, but the AIX documentation states:

The topas command reports selected statistics about the activity on the local system. The command uses the curses library to display its output in a format suitable for viewing on an 80x25 character-based display or in a window of at least the same size on a graphical display. The topas command requires the bos.perf.tools and perfagent.tools filesets to be installed on the system.

What version of AIX do you have? Some commands send their output via error handling to the screen, did you try '2>>vi.err'?

Good Luck