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by Scali 3776 days ago
The artifact colours are quite off as well, so I suspect the card used was not a real IBM CGA card. On my ATi Small Wonder and Paradise PVC4 cards, I get the exact same Kefrens bars, with the top chopped off.

Having said that, the fact that the music slows down noticeable during the moire-effect seems to indicate that indeed some instructions are a few cycles off here and there.