et voici un extrait de mon fichier recalbox.config
------------ H - HERE IT IS - GLOBAL EMULATOR CONFIGURATION ------------
The global value will be used for all emulators, except if the value
is redefined in the emulator
Set game resolution for emulators
select your mode from the command : tvservice -m [MODE]
(prefer) mode 35: 1280x1024 @ 60Hz 5:4, clock:108MHz progressive
CEA 4 HDMI : 1280x720 @ 60Hz 16:9, clock:74MHz progressive
use 'default' for using the default resolution
(string)
global.videomode=DMT 35 HDMI
global.videomode=CEA 4 HDMI