Emulator files

Multi-System

BIOS files for RetroArch cores and mednafen standalone. ^mirror

BIOS files for MESS

Nintendo

Famicom (NES)

• Famicom Disk System BIOS
  Required for FDS emulation.

Super Famicom (SNES)

• Satellaview BIOS
  Required for some Satellaview releases. For bsnes and snes9x-sx. This is a modified BIOS with the replay limitation removed and an English translation for the town hub.
• SuperDisc BIOS (todo)
  Required for Sony's SNES-CD emulation. For no$sns 1.6.
• DSP1b
  Required only in recent higan/bsnes versions past 0.73.
• SNES Coprocessor ROMs
  Required only in recent bsnes libretro versions past 0.92.

Nintendo 64

• Collection of N64 Emulators and Plugins
• LLE RSP plugin for Project64
• pifrom.bin and N64DD IPL
  Required for N64DD emulation. For CEN64. JP version.

GameCube/Wii

• GameCube BIOS
  Optional. Dolphin uses it to load the better original system fonts, but even without it it has (uglier) replacement fonts.
• DSP-LLE for Dolphin
  Optional. Needed for more accurate low-level emulation of DSP audio. Required in Dolphin for connectivity with GBA units. A HLE solution removing this requirement exists, but is still incomplete.
• Swiss-GC .dol
  Optional. Needed for 'native' widescreen.
• Wii Network Certs

Game Boy Color

• GBC BIOS
  Optional. Bootstrap ROM. A variant exists for the monochrome GB.

Game Boy Advance

• GBA BIOS
  Optional. Required for a few games, homebrew, and connectivity with the GameCube.
• E-Reader ROM (todo)
  Required for e-Reader emulation.

Nintendo DS

• NDS BIOS and Firmware
  Optional. Needed for NO$GBA.
• DSi BIOS
  For DSi emulation. Required (NO$GBA).
• DSi NAND
  For DSi emulation. Optional (NO$GBA). Improves compatibility. No easy way to dump from real hardware.

Nintendo 3DS

• 3DS Fonts
  Optional.
• 3DS Mii Data Archive
  Required for some games. Used to be included in unofficial Chinese builds.

Sony

PlayStation

• PS1 BIOS
  Required for some emulators like mednafen. Copyright-free replacements (called HLE BIOSes) also exist for other emulators. (MD5 Hashes)
• PS1<->PSP Save Converter
  Converts PS1 (.mcr) to PSP's PS1 (.vmp) save format and vice versa.

PlayStation 2

PS2 BIOS ^mirror
Required for PS2 emulation. (MD5 Hashes)

PSP

Original PSP Fonts
Optional. PSP emulators have replacement fonts, but they're uglier.

PlayStation 3

• PS3 LLE Modules
• PS3 Fonts
• Official download for srpx files
  Needed for RPCS3. (Needs mirror)

SEGA

Sega CD

• Sega CD BIOS
  Required.

Saturn

• Saturn BIOS
  Required for mednafen. Optional for SSF (at the cost of compatibility).

Dreamcast

• Dreamcast BIOS
  Needed for nullDC. (MD5 Hashes)
• Dreamcast/Naomi/Hikaru BIOS
  Needed for DEMUL.

Microsoft

MSX

• MSX BIOS list
  Optional for many cartridge games (covered by the unofficial C-bios file). Required for all other games.

Xbox

• Xbox BIOS and files
  Needed for XQEMU.
• Xbox HDD Image for XQEMU. ^mirror
• Xbox files
  For MAME. (MCP-X bootrom included is a bad dump)

Other Systems

PC Engine/TG-16 (NEC)

• System Card Pack
  Required for CD-based games (just syscard3.pce is enough in most cases).

X68000 (Sharp)

• X68000 BIOS
  cgrom (font file) and iplrom are required. The others aren't.