SYSVBL
59345         E7D1

This is the immediate vertical blank routine (stage one VBLANK).

SYSVB3
59400         E808

This is the stage two VBLANK routine.

SETVBL
59666         E912

This routine can be used to set up vectors for your own VBLANK routines, and also for the system timers. See SETVBV at 58460.

XITVBL
59710         E93E

Exit from vertical blank.

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