waits for ly 142
enables lycint
sets lyc to 144
interrupt enable

on lycint:
jump to 0x1000
does a bunch of nops
writes 0x10 to ff41
reads IF
outputs value of IF&3

m1irq_enable_after_lyc144_1.gbc should output 1
m1irq_enable_after_lyc144_2.gbc should output 3