MG_diskchip
ROM_PUTX(MONRELOC(int, MG_diskchip) >> 24 & 0xff);
ROM_PUTX(MONRELOC(int, MG_diskchip) >> 16 & 0xff);
ROM_PUTX(MONRELOC(int, MG_diskchip) >> 8 & 0xff);
ROM_PUTX(MONRELOC(int, MG_diskchip) >> 0 & 0xff);