They implemented this protocol on the Micro, and used the Keyboard library to create a HID device. The final product is an adapter for NeXT to USB, which allows for the old keyboards to be used ...

in the case of this Morse keyer to USB keyboard adapter. To revive her dad’s old straight key, a sturdy mid-20th century beast from either a military or commercial setup, [Nomblr] started with a ...

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 ...