<I picked up a couple of HA4000's recently, having only seen them
<before in pictures.  I was interested in putting some real DEC
<equipment into my home network of Vaxes and Pmaxes.  However, 
<giving them a good look, I realize I don't have the foggiest
<idea how to hook them up.  In the middle of the device, there
<is a clamp, with a little sharp thingy that looks like it's supposed
<to dig into a wire of some kind, passing through there.  Would 
<that be a thinnet coaxial cable?

It's for thick eithernet cable and the sortest recommended segment of it 
would be 25 meters.  You will also need a special tool to drill the cable 
so the spike doesn't short the center conductor to the shield.

Allison