Can i power the namco i/o board from the top connecter bypassing the jamma edge connector?

[Arcade-Projects]

Title pretty much says it all I'm doing a project but I'm not exactly sure if I can power the i/o from the top connector
Or is it only for power going out to supply power to the 256? Can it go both ways?

Source: https://www.arcade-projects.com/threads ... tor.28582/