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 STAT
outputs value of STAT&7

DMG-08 / CGB:
lycint_lycflag_1.gb should output 0
lycint_lycflag_2.gb should output 6
lycint_lycflag_3.gb should output 4
lycint_lycflag_4.gb should output 0

CGB:
lycint_lycflag_ds_1.gb should output 0
lycint_lycflag_ds_2.gb should output 6
lycint_lycflag_ds_3.gb should output 4
lycint_lycflag_ds_4.gb should output 2