Quoted from gliebig:How would you do this conversion to a 4 player?
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Skee Ball actually sold the machines that way, but I've never seen the inside of the multi-player version.
Guessing that it would require a different display board and marquee, then perhaps just a EPROM update on the control unit.
But that's purely speculation. Had a shot at a 4 player unit some years back but the people that had it seemed to think that
it was gold plated so I just stuck with the single player.