Installation

Copy !UnixHome over your existing copy if you have one. !UnixHome must be seen
by the filer before !RetroArch is run so the default RetroArch settings are
picked up.
The file !UnixHome.home./config.retroarch/retroarch/cfg contains default
settings that work better with RISC OS.

The !SharedLibs folder needs to be installed in !Boot.Resources. It can be
obtained from http://www.riscos.info.

http://www.riscos.info/packages/arm/Develop/gcc/SharedLibs-C++2_6.0.17-Rel3-1.zip
http://www.riscos.info/packages/LibraryDetails.html#SharedLibs-C++2

If you already have the VFP version of !Otter Browser installed then only the libSL shared libraries need to be copied.
Make a backup of !SharedLibs first.
Copy the !Boot folder over your existing one. It contains the shared libraries
used by !RetroArch.

Cores

There are currently 61 cores that run. Some are too slow. Others don't fully run. A few cores may need alignment exceptions turned off.

2048
Amstrad - CPC (CrocoDS)
Arcade (FFinalBurn Neo)
Arcade (MAME 2003-Plus)
Arcade (MAME 2010)
Atari - 2600 (Stella 2014)
Atari - 5200 (Atari800)
Atari - 7800 (ProSystem)
Atari - Jaguar (Virtual Jaguar)
Atari - Lynx (Handy)
Atari - ST/STE/TT/Falcon (Hatari)
Bandai - WonderSwan/Color (Beetle Cygne)
Cannonball
Cave Story (NXEngine)
Commodore - Amiga (P-UAE)
Commodore - C128 (VICE x128)
Commodore - C64 (VICE x64, fast)
Commodore - CBM-II (VICE xcbm2)
Commodore - PET (VICE xpet)
Commodore - PLUS4 (VICE xplus4)
Commodore - VIC20 (VICE xvic)
Dinothawr
Doom (PrBoom)
DOS (DOSBox)
Flashback (REminiscence)
GCE - Vectrex (vecx)
Handheld Electronic (GW)
Magnavox - Odyssey2 / Phillips Videopac+ (O2EM)
Mattel - Intellivision (FreeIntv)
Microsoft - MSX (fMSX)
Mini VMac
Mr.Boom (Bomberman)
MSX/SVI/ColecoVision/GB-1000 (blueMSX)
Multi (MESS 2015)
NEC - PC Engine/CD (Beetle PCE FAST)
NEC - PC Engine SuperGrafx (Beetle SuperGrafx)
NEC - PC-8000 / PC-8000 series (QUASI88)
NEC - PC-98 (Neko Project II Kai)
NEC - PC-98 (Neko Project II)
NEC - PC-FX (Beetle PC-FX)
Nintendo - DS (melonDS)
Nintendo - Game Boy Advance (Meteor)
Nintendo - Game Boy Advance (mGBA)
Nintendo - NES / Famicom (FCEUmm)
Nintendo - SNES / SFC (Beetle bsnes)
Nintendo - SNES / SFC (Snes9x - Current)
Nintendo - Virtual Boy (Beetle VB)
Palm OS (Mu)
Quake 1 (TyrQuake)
Quake 2 (vitaQuake 2)
Rick Dangerous (XRick)
SAM Coupe (SimCoupe)
ScummVM
Sega MS/MD/CD/32X (PicoDrive)
Sega Saturn (Yabuase)
Sharp X68000 (PX68k)
Sinclair - ZX 81 (EightyOne)
SNK - Neo Geo Pocket/Color (Beetle NeoPop)
Sony - Playstation (Beetle PSX)
The 3DO Company - 3DO (Opera)
ZX Spectrum (Fuse)