- A homebrew enabled PlayStation 3 console. As of now that mostly means having a custom firmware installed. Obtaining and installing such a software is out of the scope of this document. Sorry, but you're on your own for that one.
- At least one ScummVM supported game. The list of compatible games can be seen here: http://www.scummvm.org/compatibility/
The page http://wiki.scummvm.org/index.php/Where_to_get_the_games references some places where those games can be bought. Demonstration versions for most of the supported games are downloadable on http://scummvm.org/demos/
- An USB drive.
Installing
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From a computer, download the installable package of the PS3 port from ScummVM's main site. It should be a .pkg file. Copy it to an USB drive.
After having plugged the USB drive to you PS3, the installation package should appear in the XMB under the "Games > Install Package" menu. Installing it copies ScummVM and its dependencies to your PS3's hard drive. It also adds the "Games > PlayStation 3 > ScummVM" XMB entry which is to be used to launch ScummVM.
Configuring and playing games
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The user manual describes how to add games to ScummVM and launch them : http://wiki.scummvm.org/index.php/User_Manual
PlayStation 3 Specifics
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Games can be launched either from an USB drive or from the internal hard drive. The internal hard drive has better performance though.
Savegames are wrote in the /hdd0/game/SCUM12000/saves folder.