En: 5. Controls - eduardofilo/RG350_adam_image GitHub Wiki

Here are some cool shortcuts that can be used with the OpenDingux system, SimpleMenu, RetroArch, and standalone emulators.

Context Shorcut Function
OpenDingux Hold Power Power off
OpenDingux Power + Start + Select Reboot
OpenDingux Power + Select Kill current app
OpenDingux Power + UP Volume up
OpenDingux Power + DOWN Volume down
OpenDingux Power + RIGHT Brightness up
OpenDingux Power + LEFT Brightness down
OpenDingux Power + A Hardware scaling ratio mode
OpenDingux Power + B Mouse mode (formerly POWER + L1)
OpenDingux Power + Y Sleep mode (tap POWER to resume)
OpenDingux Power + X Take screenshot (on ~/screenshots)
OpenDingux A (while powering on) It'll skip the logo and show the output of the init scripts
OpenDingux Select (while powering on) Boot mode. Check this guide
SimpleMenu Start Brings up the Settings screen
SimpleMenu Select ROM options. Let's you select autolaunch, emulator (if multiple emulators are defined for the selected section) and overclocking
SimpleMenu Up Selects the previous game/section/group
SimpleMenu Down Selects the next game/section/group
SimpleMenu Left Skips to the previous page in the current section
SimpleMenu Right Skips to the next page in the current section
SimpleMenu R1 Switches between menu and fullscreen mode
SimpleMenu R2 Refreshes the current section (in case you added some ROMs while the menu is running)
SimpleMenu A Launches a game/program
SimpleMenu B It takes you one screen back
SimpleMenu X On regular sections, marks a game as a favorite, on the favorites section, it takes it off from the favorites list
SimpleMenu Y Goes to the favorites section
SimpleMenu B + Left Skips to the previous letter
SimpleMenu B + Right Skips to the next letter
SimpleMenu B + Up Goes to the previous section, without showing the logo
SimpleMenu B + Down Goes to the next section, without showing the logo
SimpleMenu B + Select Random select
SimpleMenu B + X Deletes the selected rom WITHOUT ASKING FOR CONFIRMATION. Doesn't work on the favorites section or in the Apps and Games section
SimpleMenu B + A Launches the emulator itself instead of a rom, if it supports to be run as a standalone application
RetroArch Select + A Pause
RetroArch Select + B Reset
RetroArch Select + X or Power RetroArch Menu. In some cores (G&W for example) the Select + X shortcut collides with the core's own shortcuts; use Power in that case.
RetroArch Select + Y Fast forward
RetroArch Select + R1 Savestate save
RetroArch Select + L1 Savestate load
RetroArch Select + R2 Swap disc
RetroArch Select + L2 Open CD tray
RetroArch Select + Start Quit
RetroArch Select + Left/Right Change savestate slot
RetroArch Select + Up/Down Volume change
RetroArch/Neo Geo FBA Hold Start UniBIOS settings
RetroArch/CPS2 R2 or R3 Test menu on some games
RetroArch/Famicom Disk System L1 Disk side change
RetroArch/Famicom Disk System R1 Insert/eject disk
FBA (MAME, FBA and CPS) L1 + R1 + Start or Power Open emulator menu that allows us to quit
FBA (MAME, FBA and CPS) L1 + R1 + Y Show/hide FPS counter
FBA (MAME, FBA and CPS) L1 + R1 + B Savestate save
FBA (MAME, FBA and CPS) L1 + R1 + A Savestate load
FBA (MAME, FBA and CPS) Select Insert coin
FBA (MAME, FBA and CPS) Start Start Player 1
FBA (MAME, FBA and CPS) Select + Start Start Player 2
xMAME Select + R1 Insert coin
xMAME Select + L1 Start Player 1
xMAME Select + L1 + R1 Quit
xMAME L1 + R1 Pause
xMAME Start + R1 Show/hide FPS counter
xMAME Start + L1 Configuration menu
xMAME Start + Down Take screenshot (on /media/data/local/share/xmame/xmameVV/snap)
xMAME Start + Left Savestate save. Then select save slot (by letter, there are 29) and press A
xMAME Start + Right Savestate load. Then select save slot and press A
Daphne L1 Insert coin
Daphne Start Start game
Daphne Select Quit
PocketSNES (SNES) Select + Start or Power Open emulator menu that allows us to quit
ReGBA (GBA) Select + Start or Power Open emulator menu that allows us to quit
PCSX4All (PlayStation) Select + Start or Power Open emulator menu that allows us to quit
JzIntv Select Open emulator menu that allows us to quit
JzIntv Power Quit
JzIntv R1 Virtual controller
JzIntv L1 Virtual keyboard
ColecoD (ColecoVision) Select + Start Open emulator menu that allows us to quit
Tac08 (PICO8) Start Open emulator menu that allows us to quit
Fuse (ZX Spectrum) Select Virtual keyboard
Cap32 (AMSTRAD CPC) Y + Start Virtual keyboard. Once displayed, open/close the RA menu (Select + X) so that the left stick starts working as a mouse
Vice 64 (Commodore 64) Select Virtual keyboard
PUAE (Commodores Amiga) L1 Virtual keyboard
BeebEm (BBC Micro) L1 Open emulator menu that allows us to quit
BeebEm (BBC Micro) R1 Virtual keyboard

Don't miss this cheatsheet made by @iammeat that includes all the above controls in a much more convenient format.