Order .8mm for best fit. A simple pcb to defeat the cic lockout in a frontloader nes instead of using two wires. this goes on the bottom of the cic chip and the 74hcuo4 ic. The top of the pcb has the traces and no writing that side goes up. On the frontloading nes, locate the cic and 74huoc inverter, the inverter will be to the right and down from the cic. Place this board to where the topmost right hole goes on pin 8 of the cic(it will be the last pin on the top right of the cic) it should line up over pin 7 and 8 of the cic, and pin 1 and 2 of the inverter. Then simply solder the 4 vias in place and done. No need to solder the holes without copper rings on them.