waits for mode3
enables mode 2 int
sets lyc to ly+1
enables lyc int
waits for int

on int jumps to 0x1000
writes 0x40 to ff41
nops til somewhere in or before next mode2
writes 0x20 to ff41
reads IF
outputs value of IF&3

late_enable_after_lycint_disable_1.gbc should output 2
late_enable_after_lycint_disable_2.gbc should output 0
