* The BIOS & Firmware files go into the `~/retrodeck/bios/` directory <br>
**Example:**<br>
You have a BIOS for the PSX called `exampleBIOSPSX.bin`, you just put that file into the `~/retrodeck/bios/` folder.
## Step 3: ROMs
**NOTE:** On the Steam Deck this step needs to be done in Desktop Mode
### On ROMs
Rom files needs to be put in their corresponding system directory inside the `roms` folder.<br>
Note that the `roms` folder location can be different depending on where you choose to put it during the installation process. The following options are available during the installation:
#### **Choice: Internal**<br>
If during the installation of RetroDECK you choose the Internal option for the roms folder:<br>
The roms folder is:`~/retrodeck/roms/`
#### **Choice: SDCard**<br>
If during the installation of RetroDECK you choose the SDCard option for the roms folder:<br>
The roms folder is: `<sdcard>/retrodeck/roms/`<br>
(Please note that the `<sdcard>` is an example and not called so inside your Linux/SteamOS system but rather your unique per SDCard ID number).<br>
#### **Choice: Custom**<br>
If during the installation of RetroDECK you choose the Custom option for the roms folder:<br>