or because their checksum is same as an existing one?
Code:
ROM_SYSTEM_BIOS( 13, "bios13", "epr-21577e (USA)" ) \ ROM_LOAD16_WORD_SWAP_BIOS( 13, "epr-21577e.ic27", 0x000000, 0x200000, CRC(cf36e97b) SHA1(b085305982e7572e58b03a9d35f17ae319c3bbc6) ) \ ROM_SYSTEM_BIOS( 14, "bios14", "epr-21577d (USA)" ) \ ROM_LOAD16_WORD_SWAP_BIOS( 14, "epr-21577d.ic27", 0x000000, 0x200000, CRC(60ddcbbe) SHA1(58b15096d269d6df617ca1810b66b47deb184958) ) \ ROM_SYSTEM_BIOS( 15, "bios15", "epr-21579d (Korea)" ) \ ROM_LOAD16_WORD_SWAP_BIOS( 15, "epr-21579d.ic27", 0x000000, 0x200000, CRC(cf36e97b) SHA1(b085305982e7572e58b03a9d35f17ae319c3bbc6) ) \ ROM_SYSTEM_BIOS( 16, "bios16", "epr-21579 (Korea)" ) \ ROM_LOAD16_WORD_SWAP_BIOS( 16, "epr-21579.ic27", 0x000000, 0x200000, CRC(60ddcbbe) SHA1(58b15096d269d6df617ca1810b66b47deb184958) ) \
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