Daniel Staal <[email protected]> wrote: > --As of May 15, 2011 8:03:29 PM -0700, [email protected] is > alleged to have said: > > > The AT and PS/2 keyboard interfaces are electrically identical > > -- only the physical connector is different. > > --As for the rest, it is mine. > > The physical connector is all that actually needs to be different: > Hot-swap interfaces make a point of connecting ground before power, > usually be longer ground pins.
The PS/2 should qualify on this point, provided it is wired _correctly_ (with the connector shell grounded both on the motherboard and in the cable). I'm less sure about the AT, which used a 5-pin DIN plug that may not even have had a shell-ground on the motherboard -- we were less concerned about generating RFI in those days. IIRC all 5 pins were the same length. It's possible this particular Belkin keyboard used longer pins for power and ground than for signal, so as to be safely hot-pluggable even if the motherboard didn't ground the connector shell. However, I've since gotten by with hot-plugging a PS/2 trackball on the same machine a couple of times, to clear lockups. _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[email protected]"
