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Games that hang

Problem:

  • Prehistorik Man hangs after the level intro screen (black screen)
  • Harvest Moon hangs after the initial game cutscene (white screen)
  • Super Mario Land hangs at the title screen
  • Dr. Mario hangs as soon a Start is pressed in the game options screen

Hypothesis: These hangs probably have to do with interrupts not working properly. Not sure what else could possibly be causing them. I do know that after I implemented more PPU functionality to pass dmg-acid2 Super Mario Land stopped working. Fairly sure it was working here: 9f468c73