I found a way to enter supermodel(Groovy MiSTer)
in my Astro city Nanao ms9-29
MiSTer 24KHz in NANAO MS9-29
Resolution: 496×384 60Hz
video_mode=496,8,48,56,384,1,3,10,14520
Of course, in the MiSTer.ini setting, in addition to the above values for MENU and video_mode, vga_scaler=1 also needs to be set.