UXN - RetroBIOS¶
Technical notes
Libretro wrapper around the zuxn library (Zig implementation of the Uxn/Varvara spec by Hundred Rabbits). The file device in Varvara handles ROM-initiated I/O but does not load system files from the system directory.
No BIOS or firmware files required.
Why no files
Uxn/Varvara is a software-defined stack machine with 64KB of memory. The VM has no firmware or BIOS. ROMs compiled from Uxntal assembly are loaded directly via libretro game_info. The .info declares no firmware.
Generated on 2026-04-18T08:05:07Z