On the Batocera and Retropie frontend, it is possible to create collections that bring together several Roms and appear in the Frontend as a fully-fledged system

To build these collections you can do it via the Frontend interface, or with ARRM (since 1.8.6.3) see download link: http://jujuvincebros.fr/telechargements2/category/11-arrm-update-correctif

A collection is actually a file named 'custom-%NAME%.cfg ' (where %NAME% will be the name of your collection) which is in this folder:

• Under Batocera: \share\system\configs\emulationstation\collections\
• Under Retropie: \configs\all\emulationstation\collections\

The file is then completed with the path of the Roms that we want

Example under batocera with the collection “ custom-shmups.cfg ”

/userdata/roms/mame/1941.zip
/userdata/roms/mame/agallet.zip
/userdata/roms/atari2600/galaxian.bin
/userdata/roms/neogeo/sonicwi2.zip
...

Same example under Retropie

/home/pi/RetroPie/roms/roms/mame/1941.zip
/home/pi/RetroPie/roms/userdata/roms/mame/agallet.zip
/home/pi/RetroPie/roms/userdata/roms/atari2600/galaxian.bin
/home/pi/RetroPie/roms/userdata/roms/neogeo/sonicwi2.zip
...

• Select the Roms you want to put in your collection

• Click on the button ' Add to collection '

• The following screen appears

If your Batocera / Retropie is connected to the network, you can directly create the file custom-%NAME%.cfg on your Batocera / Retropie by respecting the path:

• Under Batocera: \share\system\configs\emulationstation\collections\
• Under Retropie: \configs\all\emulationstation\collections\

If your Batocera / Retropie is not connected to the network, it will suffice to create your custom-%NAME%.cfg file locally then, once completed, to copy it into the correct directory on Batocera / Retropie.

Click on the “ … ” button to access the file explorer. You can :

• Select an existing collection
• Create a new collection by doing: 'right click', then 'New', then 'Text document' and Create your document 'custom-%NAME%.cfg ' “

Then click on the button “ Create collection ”

The files are added to the collection.

Remember to activate the new collections created by going to your Batocera / Retropie in the appropriate menu. Existing collections will appear in the list of systems.