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I don’t have my OSSC yet and I’m not 100% sure how the arcade monitors for this game (and other TATE mode) games are designed so this is a question for those more knowledgeable than I:
When this came out in the arcade would it not have been designed for a CRT turned 90 degrees? Hence the scanlines would have been horizontal as normal and would only appear vertical because the monitor was turned 90 degrees? Hence you should be using normal horizontal scanlines and then turning the monitor 90 degrees to get it looking more like how it would in the arcade original?
In my head that makes sense but I’d love to know for sure as I’m also an Ikaruga fan.