This is the circuit board inside the user port splitter. Nothing very exciting here, just a couple of logic chips on the other side of the board.

If, like me, you find that piles of goodness-knows-what gather on the lid of your Beeb, which have a habit of rolling off and scattering all over the place when you lift up the Beeb to get to the ports underneath, something like this User Port Splitter is very handy for preventing this happening, since devices can be connected and removed from the user port via the splitter without ever having to rummage around underneath the Beeb!