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# 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