Thanks for the reply. In the end I paid a bit more for Aten's own adaptor which specifies that it works with KVM switches (which I assumed must include Aten's own KVMs). It seems to work OK.

I'm have an Aten CS-84A KVM switch which currently switches between three PCs using PS2 keyboard and mouse connections, so I'd like to use the 4th port on the KVM for my Pi. I've tried using the cheap Newlink PS2 to USB adaptor from Amazon but it didn't work at all. Amazon also sells a much more exp...