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+GameShell ships with preinstalled RetroArch. Instructions how to install it and configure you can find there https://github.com/clockworkpi/GameShellDocs/wiki/Update-RetroArch
+
+You have 2 options if you want to emulate some system:
+- use RetroArch with core (some systems also needs BIOS file) for that system
+- standalone emulator of that system
+
+## RetroArch vs Standalone emulator?
+
+Seems standalone emulator can be more performant
+
+## How to add new core to RetroArch?
+
+Basically all you need is a `action.config` file with a link to the games folder and core to use for that games.
+
+More details https://forum.clockworkpi.com/t/how-to-add-new-emulators-gameboy-snes-etc/862
+
+
+## Where to get RetroArch Cores?
+
+- From here: http://buildbot.libretro.com/nightly/linux/armv7-neon-hf/latest/
+- Or build it yourself: https://forum.clockworkpi.com/t/retroarch-megathread/716/226
+
+## Where to find BIOS for specific system?
+
+Google knows better)
+
+`SCPH1001.bin` BIOS file works nice for PS1.
+ 
+By default for RetroArch BIOS should be placed in the same directory where games for specific system are located.
+You can change BIOS folder `RetroArch -> Settings -> Directory -> System/BIOS`
+
+---------
+
+## Emulators:
+
+### NES (NESTOPIA)
+It's preinstalled with GameShell. Original `action.config`
+
+```
+ROM=/home/cpi/games/NESTOPIA
+ROM_SO=/home/cpi/apps/emulators/nestopia_libretro.so
+EXT=zip,nes
+LAUNCHER=retroarch -L
+TITLE=NESTOPIA Roms
+SO_URL=https://raw.githubusercontent.com/cuu/emulators/master/nestopia_libretro.so.zip
+```
+
+---
+
+### SNES
+```
+ROM=/home/cpi/games/SNES
+ROM_SO=/home/cpi/apps/emulators/snes9x2010_libretro.so
+EXT=sfc,zip,smc
+LAUNCHER=retroarch -L
+TITLE=SNES
+SO_URL=http://buildbot.libretro.com/nightly/linux/armv7-neon-hf/latest/snes9x2010_libretro.so.zip
+```
+
+---
+
+### Game Boy/Game Boy Color/Game Boy Advance
+
+It's preinstalled with GameShell. But this seems faster:
+```
+ROM=/home/cpi/games/MGBA
+ROM_SO=/home/cpi/apps/emulators/mgba_libretro.so
+EXT=gb,gbc,gba,gbx
+LAUNCHER=retroarch -L
+TITLE=MGBA Roms
+SO_URL=http://buildbot.libretro.com/nightly/linux/armv7-neon-hf/latest/mgba_libretro.so.zip
+```
+_Looks like some games may require BIOS. But I'm not shure_
+
+---
+
+### PlayStation One
+**option 1:**
+
+GameShell has preinstalled PCSX. But you need a BIOS file `SCPH1001.bin` (extensions in lower case! not .BIN) and place it there `/home/cpi/launcher/Menu/GameShell/20_Retro\ Games/Pcsx/bios/SCPH1001.bin`
+Forum thread: https://forum.clockworkpi.com/t/pcsx-rearmed-for-gameshell/436/15
+
+**option 2 (RetroArch):**
+
+1. Place your games in folder `/home/cpi/games/ps1` (place BIOS in this folder too).
+2. Create `action.config` file inside `/home/cpi/launcher/Menu/GameShell/20_Retro\ Games/30_ps1/` folder
+```
+ROM=/home/cpi/games/ps1
+ROM_SO=/home/cpi/apps/emulators/pcsx_rearmed_libretro.so
+EXT=cue,img,mdf,pbp,toc,cbn,m3u
+LAUNCHER=retroarch -L
+TITLE=PS one
+SO_URL=http://buildbot.libretro.com/nightly/linux/armv7-neon-hf/latest/pcsx_rearmed_libretro.so.zip
+```
+
+---
+
+### SEGA Mega drive/GENESIS
+**option 1 (PicoDrive):**
+Instruction https://forum.clockworkpi.com/t/picodrive-standalone-and-libretro-core-mega-drive-emulator/2331/18
+
+
+You can also add file `/home/cpi/launcher/Menu/GameShell/20_Retro\ Games/20_SEGA-MGD/action.config` to run games from GameShell menu:
+```
+ROM=/home/cpi/games/SEGA-MGD
+ROM_SO=
+EXT=7z,bin,gen,md,smd,zip
+LAUNCHER=/home/cpi/launcher/Menu/GameShell/PicoDrive/PicoDrive
+TITLE=SEGA-MGD
+SO_URL=
+```
+So `PicoDrive` should be inside this folder `/home/cpi/launcher/Menu/GameShell/PicoDrive` and your SEGA games inside `/home/cpi/games/SEGA-MGD`:
+
+
+**option 2 (RetroArch):**
+
+`picodrive_libretr.so` core is fastest but it didn't work for me, but you can try it.
+
+`genesis_plus_gx_libretro.so` works fine (but I had some lags)
+
+```
+ROM=/home/cpi/games/SEGA-MGD
+ROM_SO=/home/cpi/apps/emulators/genesis_plus_gx_libretro.so
+EXT=7z,bin,gen,md,smd,zip
+LAUNCHER=retroarch -L
+TITLE=SEGA-MGD
+SO_URL=http://buildbot.libretro.com/nightly/linux/armv7-neon-hf/latest/genesis_plus_gx_libretro.so.zip
+```