Note that this requires a specially-modified NES/Famicom controller; standard ones will not work. Press and hold all four D-Pad buttons on the second controller, then press Reset. Now, the program is waiting for the A button on the first controller to be pressed. When you press it, if the Work RAM is properly initialized, a message "WORK RAM INIT OK" will be displayed all along with the "PROM OK!" and "CROM OK!" messages for a very short time. In other cases, you'll see a message "WORK RAM NO INIT. PUSH B" and then "PLEASE SET POWER OFF" when B is pressed and WRAM is initialized.