so close... bedtime for me else i'd try and figure the options. here's the output ;

$ sudo gainroot
Root shell enabled


BusyBox v1.01 (Debian 3:1.01-4.osso10) Built-in shell (ash)
Enter 'help' for a list of built-in commands.

/home/user # xmame invaders
SDL: Info: SDL initialized
info: trying to parse: /usr/lib/xmame/xmamerc
error: unknown option artwork_directory, on line 10 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option cheat_file, on line 11 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option hiscore_file, on line 12 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option history_file, on line 13 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option mameinfo_file, on line 14 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option inipath, on line 17 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option ctrlr_directory, on line 18 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option cfg_directory, on line 21 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option nvram_directory, on line 22 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option memcard_directory, on line 23 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option input_directory, on line 24 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option hiscore_directory, on line 25 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option state_directory, on line 26 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option snapshot_directory, on line 27 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option diff_directory, on line 28 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option skip_disclaimer, on line 35 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option skip_gameinfo, on line 36 of file: /usr/lib/xmame/xmamerc
ignoring line
error: unknown option bios, on line 37 of file: /usr/lib/xmame/xmamerc
ignoring line
info: trying to parse: /root/.xmame/xmamerc
info: trying to parse: /usr/lib/xmame/xmame-SDLrc
info: trying to parse: /root/.xmame/xmame-SDLrc
info: trying to parse: /usr/lib/xmame/rc/invadersrc
info: trying to parse: /root/.xmame/rc/invadersrc
Mouse/Trakball selected.
loading rom 0: invaders.h
loading rom 1: invaders.g
loading rom 2: invaders.f
loading rom 3: invaders.e
done
SDL: Info: Video mode set as 800 x 480, depth 16
Using 16bpp video mode
Game uses 32770 colors
SDL: sysdep_display_alloc_palette(32772);
error: /dev/dsp: No such file or directory
info: sysdep_dsp: using esound plugin
info: dsp: using timer based audio
error: /dev/mixer: No such file or directory
error: /dev/dsp: No such file or directory
info: sysdep_dsp: using esound plugin
info: dsp: using timer based audio
/home/user #