When loading a game in the RetroArch emulator, you'll now have some additional options that you can choose from.


Core
Some systems have more than 1 core available. If a game doesn't play well in the default core, you can always choose a different core. Some cores might also have features that others don't.

Width
You can choose a custom width. Choose 100% if you want it to fill your entire window (can slow down) or choose a smaller size if you want to see if that can offer a performance boost.

Version
By default, the latest version of RetroArch will always be selected. But if a core has an issue with the latest version, or if for some reason your device isn't supported with the latest version, you can choose an older version. Tip: Versions 1.7.0 and older seem to be the most compatible.

Drivers
You can choose different drivers but most of them only have 1 available. You can optionally pick null for it to not have a certain driver loaded. There are a few menu drivers to choose from though (menu can be accessed by pressing F1).


You can use this game to test this all out:
https://www.vizzed.com/play/contra-nes-online-nintendo-nes-193-playable

Davideo7 : how do you start the arcade games on html5? i tried pressing 5 but that doesn't work.

Davideo7 : nevermind i figured out how to start the arcade game on html5 you can erase my posts on here.

hellno163 : It was a good question and I will eventually provide the controls for each system.


For future reference to everyone, press Right Shift to insert a coin for Arcade games using the RetroArch HTML5 emulator.

Davideo7 : how can you save the controller configuration? like xbox, sega genesis