There's no edit function... (lol just found it making this - duh!)

Added psx.videomode=CEA 4 HDMI to the recalbox config

changed boot\config.txt

###Aspect ratio
sdtv_aspect=1 # 4:3
#sdtv_aspect=2 # 14:9
#sdtv_aspect=3 # 16:9

to
###Aspect ratio
#sdtv_aspect=1 # 4:3
#sdtv_aspect=2 # 14:9
sdtv_aspect=3 # 16:9

and now the psx works, doesn't fill the screen anymore but it is central which is nice, still can't get the N64 screen central