Arduino-USB-HID-RetroJoystickAdapter
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PC Engine/Turbografx support
I'd like to suggest adding PC Engine/Turbografx pads support as there are few commercial adapters for these. Some schematic of the interface are here.
I don't have any PC Engine/Turbografx controllers, but it is basically same as Megadrive/Genesis 3-button controller (one pin selects what buttons to read). https://emu-docs.org/PC%20Engine/tg16cont.html
Multitap should be easy too. After reading one controller, multitap automatically gives buttons from second controller.
just found an alternative here: https://github.com/MickGyver/DaemonBite-Retro-Controllers-USB/tree/master/PCEngineControllerUSB