There was a time when if you bought a USB mouse, in the box was also an adapter to allow it to be used with the older PS/2 interface. And if you were to go back a few more years into the past ...
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Open source, single-PCB HIDman adapter lets peripherals to easily interface with old PCs that don't support USBEven if you can use custom drivers and adapters to force USB support in old operating systems, using an adapter and simply opting for PS/2 input is ... every modern USB mouse and keyboard ...
[danjovic] has you covered with the open-source EXPS/2 keyboard adapter. It will allow you to connect either a PS/2 keyboard or a USB keyboard in fallback mode to the Expert using an ATMega328P ...
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