ok.. small problem.
MAME seems to have changed the way that ROM regions are defined.
The regions changes from constants like REGION_CPU1 to strings like "main".
Alter your ROM_REGION code for the stapper and stapper1 roms so it looks like below:
ROM_START( stapper )
ROM_REGION( 0x10000, "main", 0 ) /* 64k for code */
ROM_LOAD( "tappg0.bin", 0x00000, 0x4000, CRC(127171d1) SHA1(373e9a9d73b71e100c02862662d025f5ead2f94d) )
ROM_LOAD( "tappg1.bin", 0x04000, 0x4000, CRC(9d6a47f7) SHA1(e493e46fc70a765e54bfdd7ba7ca570e6a5c79d6) )
ROM_LOAD( "tappg2.bin", 0x08000, 0x4000, CRC(3a1f8778) SHA1(cb46a2248289ced7282b1463f433dcb970c42c1a) )
ROM_LOAD( "tappg3.bin", 0x0c000, 0x2000, CRC(e8dcdaa4) SHA1(45bf1571a2418c7dc00ccc7061a3e04e65cb6bff) )
ROM_REGION( 0x10000, "ssio", 0 ) /* 64k for the audio CPU */
ROM_LOAD( "tapsnda7.bin", 0x0000, 0x1000, CRC(0e8bb9d5) SHA1(9e281c340b7702523c86d56317efad9e3688e585) )
ROM_LOAD( "tapsnda8.bin", 0x1000, 0x1000, CRC(0cf0e29b) SHA1(14334b9d2bfece3fe5bda0cbd53158ead8d27e53) )
ROM_LOAD( "tapsnda9.bin", 0x2000, 0x1000, CRC(31eb6dc6) SHA1(b38bba5f12516d899e023f99147868e3402fbd7b) )
ROM_LOAD( "tapsda10.bin", 0x3000, 0x1000, CRC(01a9be6a) SHA1(0011407c1e886071282808c0a561789b1245a789) )
ROM_REGION( 0x08000, "gfx1", ROMREGION_DISPOSE )
ROM_LOAD( "s-tapbg1.bin", 0x00000, 0x4000, CRC(1326da21) SHA1(6886cbb83372ee4c53e19325a1552d312ce5de69) )
ROM_LOAD( "s-tapbg0.bin", 0x04000, 0x4000, CRC(539b93c3) SHA1(6196516940893fd72d0c0f18efa7584a2df44833) )
ROM_REGION( 0x20000, "gfx2", ROMREGION_DISPOSE )
ROM_LOAD( "s-tapfg1.bin", 0x00000, 0x4000, CRC(29dd8e85) SHA1(f7f7e8a3aebf075fb9a2508ce438ed3bbfdcddba) )
ROM_LOAD( "s-tapfg0.bin", 0x04000, 0x4000, CRC(a8ba850f) SHA1(e143dab595e129936a4744266788542422e3c503) )
ROM_LOAD( "s-tapfg3.bin", 0x08000, 0x4000, CRC(3d9133e4) SHA1(3ca946aee704d59a150a9cd8ea02edf5204022e3) )
ROM_LOAD( "s-tapfg2.bin", 0x0c000, 0x4000, CRC(9254d87c) SHA1(084f71436c984cb0c42cd0d07ce47ab0959b64e1) )
ROM_LOAD( "s-tapfg5.bin", 0x10000, 0x4000, CRC(5ec2544f) SHA1(1a919b0a80417c0f0e22bac2ab6932411bd4ad55) )
ROM_LOAD( "s-tapfg4.bin", 0x14000, 0x4000, CRC(9b970c4b) SHA1(f690708107c4923db5ffe344015388199c7e879a) )
ROM_LOAD( "s-tapfg7.bin", 0x18000, 0x4000, CRC(a2ef5c06) SHA1(cce74ff117921eb0438524e7f598fd2117044b1c) )
ROM_LOAD( "s-tapfg6.bin", 0x1c000, 0x4000, CRC(1baca746) SHA1(3c7015e63ab1a3f98485415e212a4b80f648dcae) )
ROM_REGION( 0x0020, "proms", 0 )
ROM_LOAD( "5784", 0x0000, 0x0020, CRC(e1281ee9) SHA1(9ac9b01d24affc0ee9227a4364c4fd8f8290343a) )
ROM_END