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# nes - RetroBIOS

Type | libretro
Classification | community_fork
Source | https://github.com/rz5/nes
Upstream | https://git.9front.org/plan9front/plan9front (sys/src/games/nes/)
Version | 1.0
Profiled | 2026-03-24
Cores | nes
Systems | nintendo-nes

Technical notes

Port of aiju's NES emulator from 9front (Plan 9) to libretro by rz5. Minimal emulator supporting mappers 0 (NROM), 1 (MMC1), 2 (UxROM), 3 (CNROM), 4 (MMC3), 7 (AxROM). Palette hardcoded in ppu.c. No BIOS or external files required. NES hardware boots directly from cartridge ROM. No FDS support (only .nes extension).

No BIOS or firmware files required. Generated on 2026-03-25T14:56:43Z