This is what I was using:
[root@[192_168_15_244] /]# ls -al /usr/share/games/doom/
drwxr-xr-x 2 root root 8192 Oct 1 11:53 .
drwxr-xr-x 3 root root 8192 Oct 1 11:53 ..
-rwxr-xr-x 1 root root 4196020 Oct 1 11:50 doom1.wad
-rwxr-xr-x 1 root root 13431132 Oct 1 11:47 freedm.wad
And I did try the -file param before -- no change.
It fails loading the default prboom.wad (which I do not have) but then appears to succeed on doom1.wad (see my previous post).
EDIT: It is working now. I needed prboom.wad instead of doom1.wad. Thanks.
This will be great dithered (to get rid of the grayscale update severe flickering). I will get on that within the next two days or so...