I loaded Fedora Core 5 and notice that udev is part of the bootup. I think this is why in this new version, 2 applications called gMFSK and XLog do not work now. They both require excess to /dev/ttyS0 and /dev/dsp and udev is not giving these to it when the user is non-root.
I have verified that both appear to work if started by root. But they do not work if started by user 0500, me. If I am to remain on fedora core 5 these applications must work. I have the old Fedora core 2 still on the computer and it runs just fine there.
Karl