USB for NT

I have two machine one is NT and the other is 2000 going through an a/b switch. The 2000 machine I have a USB keyboard w/cardreader. The question is, How would I use one keyboard for both machines? We all know that NT does not support USB, so I need a converter to convert the USB to a PS/2 port and with enough power to support the keyboard/cardreader.

Thanks in advance
IT2 (SW) Charles Carter