Some emulators require BIOS files to work correctly.
As a general rule, BIOS files must be copied to the \bios subfolder of the Retrobat folder:
{% hint style="info" %} Some systems need the bios files to be placed in subfolders or in other places. Refer to the individual system wiki page for detailed information about BIOS placement. {% endhint %}
RetroBat has a "missing bios check" function available from the GAME SETTINGS in the MAIN MENU:
The missing BIOS appear with a broken chain icon. The ones where the md5 hash is not listed by Retrobat will appear with a %20(1).png)
icon, however the latter still can work.
5200.rom is missing
{% hint style="info" %} The detailed list of required BIOS for each system can be found in the individual Game System section of the wiki. {% endhint %}
{% hint style="warning" %} BIOS files are copyrighted and are therefore not included with Retrobat.
The team can not legally distribute them, so you will need to dump them from the original hardware. {% endhint %}