When the Nintendo SNES was released 33 years ago, the controller and the console (host) implemented the joystick interface by hardware shift registers.
Over time, the SNES controller gets reused in other projects and the host side protocol gets bit-banged in software. Someone in China realizes that they could save money by implementing the SNES controller with a generic MCU instead of shift registers. And that implementation doesn’t quite work in all cases: both sides, controller and host, are microcontrollers running software that desperately pretends to a be… a humble shift register. And both sides do it wrong.
See how Jaroslav Sýkora discovered differences in controller manufacturing, their behavior, and a software fix in the post here.
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