The problem: I have a number of PS2 keyboards, when I hook them up to my computer via PS2 to USB adapter, they often work with one big problem. You can probably replicate this problem yourself as well.
Use this website to record which keys are registered:
http://random.xem.us/rollover.htmlHold down W. Keep it held down the whole time.
Hit D. Let go of D. Continue holding down W.
(this is a test to see if in a first person shooter you can run forwards, strafe to the right, then keep running forwards)
If you use a PS2 to USB adapter, the W will stop registering after you let go of D. If you are using direct connection into PS2 port, or if you are using direct connection into USB port you will have no problem at all, it will continue to register the W.
I have tried these two USB to PS2 adapters, both of them have the problem:


Second one vendor id is Vid_13ba
Does anyone know of a Ps2 to USB adapter that works correctly in this fashion?