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USB Sega Genesis and USB NES/SNES controller adapter using CH552
These are firmwares I made for a cheap (< $2) microcontroller board you can get off of AliExpress. Flashed with these firmwares and wired up, they make excellent cheap controller adapters for use with MiSTer, or anything else that can use a USB HID Joystick.
See the README.md in the zips for how to wire them up. You'll have to get creative with materials but you can also find NES, SNES and DB9 connectors and project boxes on AliExpress too.
Get the board: WeAct CH552 board @ AliExpress
Download Genesis to USB f/w + source