A hugely overpowered Forebrain ARM dev board was used to pull each switch low for a few hundred milliseconds to switch the output USB port ... the buttons on the USB sharing switch.

A device that allows one or more USB peripherals to be connected to multiple computers, one computer at a time. For example, a USB switch allows sharing ... than there are ports on the switch ...

When the Nintendo Switch was released with a standard USB-C port for accessories, we had hoped those days of hit-or-miss reverse engineering were over, but reality fell short. Redditor ...