UXN - RetroBIOS¶
| Type | libretro |
| Classification | community_fork |
| Source | https://codeberg.org/iyzsong/uxn-libretro |
| Upstream | https://github.com/chmod222/zuxn |
| Version | 0.0.1 |
| Profiled | 2026-03-25 |
| Cores | uxn |
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 2026-03-25T14:56:43Z