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Without a network, muOS and ArkOS launchers ask to copy the BIOS files from the card the system does not read (muOS bind.sh, dArkOS roms2), then install with --from and the pack. CI checks that shellcheck is present, and the test fails under CI without it.
RetroBIOS for muOS
Copy RetroBIOS.muxapp to the card, open it from muOS's archive manager to
install it, then start RetroBIOS from Applications.
It checks the BIOS folder (/run/muos/storage/bios) against the files its
emulators read and installs the missing ones: downloaded with a network
connection, or from a pack copied to the root of the card without one.
It runs in muxterm, muOS's terminal. muxterm already sends the D-pad as arrows, Start as Enter, B as Backspace (back) and Y as Space (tick). With PortMaster installed, gptokeyb2 adds A (choose), X (tick) and L1/R1 (page). Menu closes it.
Not tried on a device yet: the icon, and whether muxterm and gptokeyb2 share the pad as described.