waits until ly=3
writes 0x48 to ff41
writes 0x2 to ffff
waits until ly=4
wais until mode=0
writes 0 to ff0f
sets lyc to 5
ei
waits for int

on int:
jumps to 0x1000
nops til mode0
reads IF
outputs value of IF&3

enable_before_lycint_1.gbc should output 0