Normally, in src/drivers/neogeo.c : After SYSTEM_BIOS_START( neogeo ) : SYSTEM_BIOS_ADD( 7, "uni-bios.13","Unibios MVS (Hack, Ver. 1.3)" ) After #define NEOGEO_BIOS \ : ROM_LOAD16_WORD_SWAP_BIOS( 7, "uni-bios.13", 0x00000, 0x020000, CRC(b24b44a0) SHA1(eca8851d30557b97c309a0d9f4a9d20e5b14af4e) ) /* Universe Bios v1.3 (hack) */ \