Hello !!!

Here is a file I drew named trans.gif which is the plan for what I
utilize to connect my HP48GX to an external power supply.

I use a jack with a switch in it. When the two jacks are connected
the switch is open and when they are disconnected they are closed. 
(you can view it in the plan).

If you do it accurately you won't lose the RAM port.  Actually I use it 
with a RAM card in port 2.

Bye.

PS: If anybody is interested in the original file in AutoCad v12 
(.dwg) email me.

        /
       / /\  Carles Albert Vallv Guionnet
       \  /    Tarragona, Catalunya
      | \/   
      |      e-mail: cvag@tinet.fut.es
    \ |              cavg.el@alumne.etse.urv.es
  /  \|
/           URL:    http://www.fut.es/~mpga
\  /
  \/