RetroPie rom folder structure

[drpaneas]

I just got my PiBoy DMG RPi4 and the rom folder looks like this:

drwxr-xr-x. 2 drpaneas drpaneas  4096 Apr 28  2020 amstradcpc
drwxr-xr-x. 3 drpaneas drpaneas  4096 Apr 28  2020 arcade
drwxr-xr-x. 2 drpaneas drpaneas  4096 Apr 28  2020 atari2600
drwxr-xr-x. 2 drpaneas drpaneas  4096 Apr 28  2020 atari5200
drwxr-xr-x. 2 drpaneas drpaneas  4096 Apr 28  2020 atari7800
drwxr-xr-x. 2 drpaneas drpaneas  4096 Apr 28  2020 atari800
drwxr-xr-x. 2 drpaneas drpaneas  4096 Apr 28  2020 atarilynx
drwxr-xr-x. 2 drpaneas drpaneas  4096 Sep 10 03:47 dreamcast
drwxr-xr-x. 2 drpaneas drpaneas 20480 Sep 10 03:48 fba
drwxr-xr-x. 2 drpaneas drpaneas  4096 Apr 28  2020 fds
drwxr-xr-x. 2 drpaneas drpaneas  4096 Apr 28  2020 gamegear
drwxr-xr-x. 2 drpaneas drpaneas 36864 Sep 10 03:48 gb
drwxr-xr-x. 2 drpaneas drpaneas 77824 Sep 10 03:49 gba
drwxr-xr-x. 2 drpaneas drpaneas 36864 Sep 10 03:49 gbc
lrwxrwxrwx. 1 root     root         9 Aug  7 18:59 genesis -> megadrive
drwxr-xr-x. 3 drpaneas drpaneas  4096 Apr 28  2020 mame-libretro
drwxr-xr-x. 2 drpaneas drpaneas  4096 Sep 10 03:58 mastersystem
drwxr-xr-x. 2 drpaneas drpaneas  4096 Sep 10 03:49 megadrive
drwxr-xr-x. 2 drpaneas drpaneas  4096 Sep 10 03:50 n64
drwxr-xr-x. 2 drpaneas drpaneas  4096 Apr 28  2020 neogeo
drwxr-xr-x. 2 drpaneas drpaneas  4096 Sep 10 03:50 nes
drwxr-xr-x. 2 drpaneas drpaneas  4096 Apr 28  2020 ngp
drwxr-xr-x. 2 drpaneas drpaneas  4096 Sep 10 03:50 ngpc
drwxr-xr-x. 2 drpaneas drpaneas  4096 Sep 10 03:50 pcengine
drwxr-xr-x. 6 drpaneas drpaneas  4096 Sep 11 03:13 ports
drwxr-xr-x. 2 drpaneas drpaneas  4096 Sep 10 03:52 psp
drwxr-xr-x. 2 drpaneas drpaneas  4096 Sep 10 03:52 psx
drwxr-xr-x. 2 drpaneas drpaneas  4096 Aug  7 18:33 saturn
drwxr-xr-x. 2 drpaneas drpaneas  4096 Sep 10 03:52 sega32x
drwxr-xr-x. 2 drpaneas drpaneas  4096 Sep 10 03:52 segacd
drwxr-xr-x. 2 drpaneas drpaneas  4096 Apr 28  2020 sg-1000
drwxr-xr-x. 2 drpaneas drpaneas  4096 Sep 10 03:52 snes
drwxr-xr-x. 2 drpaneas drpaneas  4096 Sep 11 03:13 steam
drwxr-xr-x. 2 drpaneas drpaneas  4096 Apr 28  2020 vectrex
drwxr-xr-x. 2 drpaneas drpaneas  4096 Apr 28  2020 zxspectrum