Before I decide to shell out for one of these, I'd be interested to know one thing. If they convert the electrical signal from PS/2 to USB, does this mean two PS/2 keyboards can essentially be used simultaneously? I have a PS/2 port on my motherboard which works fine for my Model M, but I have another old keyboard which I would like to use from time to time since it's quieter, but I'd rather not have to go to the back of my computer to swap the keyboards around every time.
I've tried this with a passive adapter I found lying around, and a relatively new PS/2 keyboard which should work with a passive adapter just fine, and it didn't work. Presumably this is because Windows is seeing it as another PS/2 keyboard, and only one can be used at once. The adapter would be no good for my older keyboard anyway, so this doesn't bother me.
Can anyone confirm whether or not an active PS/2 to USB converter would do the job of using two PS/2 keyboards simultaneously? I'm aware of alternatives such as reverse KVMs but these are expensive solutions and I only need to use multiple keyboards with a single computer.