I was given an old printer switch box, so I have no documentation. There is no actual switch, but there are four jumpers. I can get computer A to print, but when I plug the parrallel cable into the back of coomputer B, Computer B hangs. If I unplug the parrallel cable from B, it's fine again. Computer A is WinNT4 and B is Win2000. I think it's just a combination of the jumpers though. Any ideas?