1) So far as I'm aware, all the Units have a PS2 interface on the board itself. Andy sells a PS2-USB cable if you want the cable portion. If you want to use the this software update, you need to use USB in one form or another. I used a USB/PS2 Adapter that you can get pretty much anywhere and it seems to work fine. Apparently however there are "converters" which are different than an adapter, and these will have problems ... so you don't want a converter, you want an adapter. Problem is, most websites don't make any clear distinction between them, but I think most are adapters.