Here's what is does when you use the 2nd players keypad to open a hatch on player1. To do this you have to hold down the 1st button & press another. It then draws the original P2 hatch gfx in a corresponding grid spot on the p1 grid. It doesn't actually open the hatch but it draws the original p2 hatch. Doing this will also randomly fire a Nova shot at times.
I'll bet his real pcb doesn't do this! At least both of these little things are easy for your buddy to check out...
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Pessimist: Oh, this can't get any worse!
Optimist: Yes, it can!