[danjovic] has this vintage Brazilian computer from the ... 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 ...

He prefers to play his C64 games on his computer nowadays ... The VICE emulator maps keyboard inputs to controller actions, so he decided to build himself a D-sub to USB adapter that implements ...

In short, many old PCs simply weren't made to interface with USB devices at all, and some simpler adapters may not even work properly, depending on keyboard or system. An all-in-one compatibility ...