Ok it's working now but in my way with a mix with the video i show you.
Like Gnomx said for wiki batocera before (i did it but not in the good way)
I put new modeline (directly in shell) with xrand before and modified .xinitrc : put away the # of xrandr -s 640x480 or of xrandr -s 640x480 -r 60 or xrandr -s 640x480 -r 50 : It's not the way to do what i wanted.
so I did again :
cp /etc/X11/xinit/xinitrc ~/.xinitrc
You must put these following lines into .xinitrc with the commands presents into the video: ( # are only comments ) :
#change the resolution
#xrandr -s 640x480
#change the resolution and the Hz
#xrandr -s 640x480 -r 60
#adding new modeline for Pal monitor
xrandr --newmode "640x480-15khz" 12.625000 648 672 736 808 480 534 539 625 -HSync -VSync interlace
#adding the new mode into the DVI-0 section
xrandr --addmode DVI-0 "640x480-15khz"
#put this new resolution and new frequence into output DVI-0.
xrandr --output DVI-0 --mode "640x480-15khz"
Ok I have got a problem to booting with my usb key (Batocera 5.25) on my arcade station but it worked one time on
my CRT TV screen !! i don't know why (USB 3 perhaps).
I did the same procedure with my old HD (Batocera 5.22) on it works (always) perfectly with my arcade station in 15KHz :-)
Here I tried very quickly with one game by emulators. Almost games work fine !!!
Amstrad CPC (Joe contre les pharaons) : working
Apple II (my computer) : not working at all
Commodore AMIGA (my comuter) : not working at all shit !!!
Atari2600 (Pac-Man) : working
Atari7800 (Choplifter!) : Working
Atari St (Xenon) : working
Commodore 64 : i don't now how to work but the screen is very flashy
Commodore AMIGA (my computer) : not working at all shit !!!
Dreamcast (Quake III arena) : working
Game Gear (Asterix and the secret mission) : working
GameBoy Advance (Gemini) : working
Lynx : not working
Mame (depence of roms version) ( guyruss ) : working
Sega mega System (alien 3) : working
Sega master System (Batman) : working
N64 (Doom64) : working
Neo Geo (blazing star) : working Yeaaahhh !
Nintendo (Defender of the crown) : working
pocket color (baseball start color) : working
Pc Engine (After Burner II) : working
Doom : working
Sega 32X (Space Harrier) : working
SG-1000 (Bomb Jack) : working
Super Nintendo (The Addams Family) : working
Vectrex (Scramble) : working
Wii (Wii Sport) : graphic working (i have not the pad with me).
Sharp X68000 : no working at all (probably not good bios)
zX81 and spectrum Sinclair : graphic working but I don't to use it
Thx to you KingOfGames and Gnomx and to all Batocera teams especially to nadenislamarre to his great work !
Take care of you all :-)