re: CADs new obsession - buying & modding 1up cabinets to support full MAME library

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CAD, what exactly does this mean? Are you just running MAME, using emulation station, or something else?

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It's alot to go into but you have to first understand that the system is a little messy under the hood. There's no single 'mame' but rather a couple dozen emulators used for various games organized by emulation station (the UI) which launches the selected ROM to the correct core. In fact when you launch a game you actually have the option to change it (that press A screen that shows up briefly) and since there are at least 3 versions of mame in use if s game isn't running properly you can change which emulator is used at that time. I've done this with games that aren't working correctly using a particular mame build.

Retropie is the actual "OS" for lack of a better term that boots your Pi and connects your controllers, audio, display, etc. and this launches emulation station automatically to make the start up seamless. Emulation station is where all those cool themes are built and you can go into the settings at any time and download and use different ones. There are hundreds.

That's an oversimplification and I probably missed something but the takeaway here is there is lots of stuff going on that you really need to understand going forward.