# RetroBIOS for Batocera and Knulli

Copy `RetroBIOS.sh`, `RetroBIOS.sh.keys` and the `retrobios` folder into
`roms/ports` on the SHARE partition (`/userdata/roms/ports`), update the
game list, then start **RetroBIOS** from **Ports**.

It checks the BIOS folder (`/userdata/bios`) against the files its emulators
read and installs the missing ones: downloaded with a network connection,
or from a pack copied into `roms/ports/retrobios` without one.

The controller drives it through `RetroBIOS.sh.keys`: D-pad to move, A or
Start to choose, B or Select to go back, X to tick a system, Y for the
options, L1 and R1 to page. B on the first screen closes it.

## Not tried on a device yet

EmulationStation covers the text console on Batocera and Knulli, and no
terminal for a script is documented there. RetroBIOS opens xterm (the X11
builds) or foot when either is installed, else switches to console 4, runs
there, and switches back. When console 4 does not come to the front within
3 s, it switches back and stops. Which of the two shows up on a given build
is not verified. If nothing shows, `retrobios/log.txt` says which route
was taken, and the computer route always works: with the card mounted, run
the one-line command from abdess.github.io/retrobios/wiki/installer.