waits until ly=3
sets lyc to 5
enables lyc int
waits for int

on int:
sets lyc to 6
jumps to 0x1000
lots of nops
reads IF
outputs value of IF&3

DMG-08 / CGB:
lycint_lycirq_1.gb should output 1
lycint_lycirq_2.gb should output 3
