waits for ly 150
enables lyc
sets lyc to 152
interrupt enable

on int
jumps to 0x1000
sets ff41 to 0
sets lyc to 153
nops til somewhere in or before ly153
sets ff41 to 0x40
some nops
reads IF
outputs value of IF in hex

lyc153_late_ff41_enable_1.gb should output E2
lyc153_late_ff41_enable_2.gb should output E0