Alessandro Zummo wrote:

> There's also a textfile available, which describes the protocol.
>  It's called ps-e.txt.

  It's mentioned in the .GIF you point out, but the URL is not current.

  Couldn't find it by name on the Net, but found this by way of
interest:
    http://home.quicknet.com.au/andrewm/psx/psxcont.html
--
  Cheers,
        Paul B.