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How come the NES PPU non maskable interrupt DOESNT run during the first two VBlank cycles of a game's start up, but DOES run later at the jmp loop?

isnt it non maskable? WHAT MASKS IT

@Fuego

maybe it's "non-maskable" at code level but hardware level can mask it (or not activate/watch for)?

guessing, I have no friggin' idea

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