public void handler() {
            ROM_REGION(0x030000, REGION_CPU1);/* 68000 code */
            ROM_LOAD_EVEN("a4.rom", 0x000000, 0x8000, 0xf2c41dd6);
            ROM_LOAD_ODD("a1.rom", 0x000000, 0x8000, 0xa9f816ef);
            ROM_LOAD_EVEN("a5.rom", 0x010000, 0x8000, 0x7952e27e);
            ROM_LOAD_ODD("a2.rom", 0x010000, 0x8000, 0x369af326);
            ROM_LOAD_EVEN("a6.rom", 0x020000, 0x8000, 0x8ee2c287);
            ROM_LOAD_ODD("a3.rom", 0x020000, 0x8000, 0x193e4231);

            ROM_REGION(0x30000, REGION_GFX1 | REGIONFLAG_DISPOSE);/* tiles */
            ROM_LOAD("b9.rom", 0x00000, 0x10000, 0x182b6301);
            ROM_LOAD("b10.rom", 0x10000, 0x10000, 0x8f7129a2);
            ROM_LOAD("b11.rom", 0x20000, 0x10000, 0x4409411f);

            ROM_REGION(0x060000 * 2, REGION_GFX2);/* sprites */
            ROM_LOAD("b1.rom", 0x000000, 0x010000, 0x30e2c50a);
            ROM_LOAD("b5.rom", 0x010000, 0x010000, 0x794e3e8b);
            ROM_LOAD("b2.rom", 0x020000, 0x010000, 0x6a8b3fd0);
            ROM_LOAD("b6.rom", 0x030000, 0x010000, 0x602da5d5);
            ROM_LOAD("b3.rom", 0x040000, 0x010000, 0xb9de3aeb);
            ROM_LOAD("b7.rom", 0x050000, 0x010000, 0x0a73a057);

            ROM_REGION(0x10000, REGION_CPU2);/* sound CPU */
            ROM_LOAD("a7.rom", 0x0000, 0x8000, 0x793f9f7f);
            ROM_END();
        }