Originally Posted by Crazy9000
USB polls the keyboard for new information at regular intervals. This technically means it's a little slower then ps/2, since the ps/2 is interrupt based and takes effect intermediately.
The USB polls so fast that I don't think it's humanly possible to notice the difference, so it doesn't really matter.
You're right, you really can't. But just think of all the latency you get these days when playing a game:
- from keyboard to keyboard buffer
- from keyboard buffer to directinput
- from directinput to graphics buffer
- from graphics buffer to graphics processing
- from graphics processing to screen's circuitry
- from screen's circuitry to being displayed
When you add it all up it becomes pretty noticeable. Using a PS/2 keyboard and a CRT are the two easiest parts to control, and the two put together can make a huge difference. I can understand people not using CRTs, but if you've got a PS/2 port why not use it?