libretro

RetroBIOS runs the RetroBIOS installer (install.py, from github.com/Abdess/retrobios) on the device, in its full-screen interface. The installer finds the BIOS folder of the system, checks every file its emulators read against its hash, and installs the missing ones.

With a network connection the files are downloaded. Without one, copy the BIOS pack of your system (a _BIOS_Pack.zip file from the releases page) into ports/retrobios on the card, and RetroBIOS installs from it.

Python 3.8 or newer: the system's, or PortMaster's python_3.11 runtime on aarch64, downloaded on first use.

Under a desktop session with neither foot nor xterm, RetroBIOS opens PortMaster's own screens instead of the full-screen interface.

Controls

Button	Action
D-Pad	Move
A or Start	Choose
B or Select	Back
X	Tick or untick a system
Y	Options
L1 / R1	Page up / down
Start + Select	Quit