you see i got these PS/2 type controller port adapter and they work surprisingly well except the input lag from the keyboard (i'll have to test this further...) but overall they work and i may be selling the other 3 or 2 (may keep 3 of them hehe)

so here's my with quake 3

Dreamcast PS2 type connector - YouTube

also note that i wouldn't recommended a LED lit keyboard due to the power they draw and you may damage the controller port PCB