apt-get install ssh-server

1) from PC open putty(windows) or ssh(linux)
2) connect to n900 from ssh-client
3) in ssh-client (on PC) type
# cd /opt/maemo/usr/games/pcsx
# ./pcsx -cdfile /home/user/.....
in case of black screen push ctrl+c
and try last command one's more

log that you see in ssh-client you can post here if you unsure what's going on