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;; Non-Maskable Interrupts handler.
nmi:
;; As mentioned on the `main` subroutine, rendering will be skipped until
;; the proper flag is set.
bit $20
bpl @next
;; We can start rendering stuff.
OAM_WRITE_SPRITES
;; And unset the render flag so the `main` code is unblocked.
UNSET_RENDER_FLAG
@next:
rti
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