Massive project from maxvfischer on GitHub:

This guide goes through all the steps necessary to build your own full-size arcade machine, including the pre-designed CAD-files, how to assemble all the cabinet parts, how to set up the Raspberry Pi running the arcade program etc. The project was my first project going from CAD to actual build (actually also the first time I used a CAD program).

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Buy Slot Machine

Power up your Raspberry Pi and monitor, then connect them with the HDMI cable. Install a piece of software called RetroPie, following the instructions that can be found on GitHub. This will set up. Insert microSD in Raspberry Pi 3 Insert the memory card into the Raspberry Pi and plug it into power with a 2A charger. We can use the TV or PAL video out for the output. Next, plug your keyboard or gamepad into one of the Raspberry Pi’s USB ports.