yeah it worked now i have fullscreen... but i guess it didnt fully complete update xterm showed this

Setting up psx4m-gui (0.4-6.10) ...
mkdir: invalid option -- P
BusyBox v1.10.2 (Debian 3:1.10.2.legal-1osso30+0m5) multi-call binary

Usage: mkdir [OPTION] DIRECTORY...

dpkg: error processing psx4m-gui (--configure):
subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
psx4m-gui
E: Sub-process /usr/bin/dpkg returned an error code (1)
/home/user #

this is very very promising ! Lot of games work, i'd say 98% without sound. Hope next with sound thx!