> There was actually an area of silicon that could not be used because there was an electrical outlet on the wall that they needed for something in the office, so they just didn't draw on that part.
Being curious, I just had to look at the actual chip layout in the online simulator to see if this was true. You can see a pair of rectangular voids left of the center, near the edge, the lower of which seems to have the right dimensional ratio to have been a space for a wall socket.
It's fascinating to hear the lost bit of engineering history that explains something would otherwise have forever remained a mystery. Somebody should forward this anecdote to the visual6502.org guys.