The protocol and voltages are differant.  Some mice with a PS/2 plug can adapt
 to either with an adapter, some can not.

On Friday, July 25, 1997 2:44 PM, Tim Kerby [SMTP:tim.kerby@UKONLINE.CO.UK]
 wrote:
> Hi
> ps/2 is the same as serial, just a different connector.  I have seen many
> elecrronics outlets deal simple adaptors between the differing wiring.
>
> Tim
>