I have this PAL MD2 clone that has a TCT-6801. It is currently Japanese PAL 50Hz, but I want to change it to English NTSC 60Hz. I know the crystal needs to be changed to an NTSC crystal, but I'm not sure which jumpers need to be opened/closed to set it to English NTSC 60Hz. I see 4 jumpers to the right of the chip. Does anyone know?