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Set the interupt flag after writing the status register to the stack #42

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Raised here: #33
and here: #30

Quote from the NESDev wiki
Automatically set by the CPU when an IRQ is triggered, and restored to its previous state by RTI., meaning that the interupt flag should not be set before pushing the status to the stack.

@Amathlog Amathlog mentioned this pull request Jan 10, 2022
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