![]() To do this bring up MAME in-game configuration menu (TAB key on keyboard), then choose Video options -> Screen 0 Stretched. It can be good to activate screen stretching as a MAME option.There can be a controller configuration issue with the "On Screen Display", where a button (or joystick "key") brings up this display.In this case it is better to disable the extra columns (use Core Options -> Video -> Extra Columns to Draw -> 0). If used, some games (like Streets of Rage 3) may display video artefacts on the left and right parts of the screen. There is a widescreen version of this core.You have to quit Steam for PS 5 Dual Sense controllers to work in RetroArch (via Bluetooth).I had to manually remove (via SSH) the symlink to get other cores working again. If you remove the core from Kodi add-ons interface, the symlink is still there as a leftover, and it can break stuff. Adding a core from the LibreELEC Kodi repository is also dangerous, as it installs the core in a different location (~/.kodi/addons/_NAME/) than what is expected from RetroArch (~/.kodi/userdata/addon_data/game.retroarch/), but creates a symlink there.There is also an option on the RetroArch add-on (from gamestarter) to install all cores directly and this works well. For this reason, all RetroArch cores should be installed from this repository. ![]() Although some of them will work on RetroArch, a lot of them won't (unresolved symbols errors will be encountered). The cores that can be installed via the LibreELEC Kodi repository are binary cores intended to work only on retroplayer.This is useful when some cores are hard to build for instance I could not get the current MAME core to work on the Raspberry Pi 4. There is also a repository of arm64 (aarch64) cores at.For the flatpak package, BASE_DIRECTORY=:~/.var/app//config/. Cores should then be added manually to /retroarch/cores. You can find the repositories at (and then search for the emulator you want to add). Just clone a Github repository and compile the core. It's generally easy however to build the cores manually. Some cores are available on the Ubuntu PPA repositories, but very few.This means the online updater won't work to download cores cores must be installed manually, see below. This is due to the fact that the builbot does not build cores for the arm64 architecture. It will just display "Fetching core list." and nothing will happen (there's nothing written in the logs either). The main issue (with all different packages of RA: Ubuntu PPA, flatpak or snap) is that the online updater for core won't work.It's also available via snap but I had a lot of issues (for instance, notification-daemon needed to be manually installed and started for the RA snap to launch). You should install RetroArch on Pi OS via flatpak.That's normal behavior (you could potentially change the directories to point to writable directories to change this, but it's not recommended). Note however that assets, core info files, shaders and other files are supposed to be updated by the flatpak package and the online updater will not work for those. After that, you can use the online installer to install cores. It's very easy to install flatpak on Gentoo (contrary to snap). Since the ebuilds are rather outdated and probably buggy, it's probably best to install RetroArch on Gentoo via the flatpak package.Using the system automatic installer does not work (at least not out of the box) on Gentoo. To use it on Gentoo, the rule is to install components via ebuilds (emulator cores, shaders, joypad configurations).Not all overlays have all cores - I currently use the menelkir overlay because it has the MAME cores. RetroArch is not available on main repository but on overlays.Thus framerate is limited to 50 (vs 60) for European ROMs, resulting in a slower impression for everything. This is because US/Japan uses NTSC standard with 60Hz refresh rate, whereas Europe uses PAL at 50Hz. When using ROMs, the US (or Japan) version of the game should always be used if possible.To change the theme, go to Settings -> Drivers -> Menu. On LibreELEC, the Ozone theme does not work well at all and should be replaced by XMB. You can revert back to the XMB theme (which I find nicer) if needed. Starting from RetroArch 1.8.5, Ozone is now the default theme.F1 returns to the main menu from a game.Configuration and setup of a PS 4 or PS 5 controller is completely automatic and out of the box if RetroArch has been properly installed.RetroArch is a front-end system / framework for several emulators.
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