USB to PS2 for keyboard.
I use a USB to PS2 adapter for keyboard, and plug into the PS2 socket.
USB port can have time latency problems, which makes the keyboard scan timing erratic.
This was noticeable as clunking (erratic drive but never used a CRO on it) when holding down a jog key for continuous movement.
Also using the space bar to pause was unreliable and it is not good for the ESCAPE key to be delayed.
Super X3. 3600rpm. Sheridan 6"x24" Lathe + more. Three ways to fix things: The right way, the other way, and maybe your way, which is possibly a faster wrong way.