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https://github.com/holub/mame
synced 2025-05-30 17:41:47 +03:00
undo invadpt2br encryption, reason to believe the scrambling was done post-dump since haze found out the piranha(pacman hw) romdump on that same Taito do Brasil treasure romdisk to have exactly the same weird encryption on the same offset.
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@ -402,29 +402,6 @@ static MACHINE_CONFIG_DERIVED_CLASS( invadpt2, mw8080bw_root, _8080bw_state )
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MACHINE_CONFIG_END
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static DRIVER_INIT( invadpt2br )
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{
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UINT8 *rom = machine.region("maincpu")->base();
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int offs;
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// simple encryption on rom pv01 0x4fc-0x5fb
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// (with additional mask on 4-byte parts below)
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for (offs = 0x4fc; offs < 0x5fc; offs++)
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rom[offs] ^= 0x6c;
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// 0x4fc + 1 * 0x56
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for (offs = 0x54e; offs < 0x552; offs++)
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rom[offs] ^= 0x03;
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// 0x4fc + 2 * 0x56
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for (offs = 0x5a4; offs < 0x5a8; offs++)
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rom[offs] ^= 0x01;
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// 0x4fc + 3 * 0x56
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for (offs = 0x5fa; offs < 0x5fc; offs++)
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rom[offs] ^= 0x02;
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}
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/*******************************************************/
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/* */
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/* Space Wars (Sanritsu) */
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@ -2664,7 +2641,23 @@ ROM_END
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ROM_START( invadpt2br )
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ROM_REGION( 0x10000, "maincpu", 0 )
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ROM_LOAD( "br_pv01", 0x0000, 0x0800, CRC(2931a033) SHA1(b04ccde4a4a04b37aa65edc4af4e53a8c1f03dfe) )
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ROM_LOAD( "pv01", 0x0000, 0x0800, CRC(7288a511) SHA1(ff617872784c28ed03591aefa9f0519e5651701f) )
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/* pv01 had weird encryption applied to it, very likely to have been done post-dump. */
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// for (offs = 0x4fc; offs < 0x5fc; offs++)
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// rom[offs] ^= 0x6c;
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// 0x4fc + 1 * 0x56
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// for (offs = 0x54e; offs < 0x552; offs++)
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// rom[offs] ^= 0x03;
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// 0x4fc + 2 * 0x56
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// for (offs = 0x5a4; offs < 0x5a8; offs++)
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// rom[offs] ^= 0x01;
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// 0x4fc + 3 * 0x56
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// for (offs = 0x5fa; offs < 0x5fc; offs++)
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// rom[offs] ^= 0x02;
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ROM_LOAD( "br_pv02", 0x0800, 0x0800, CRC(420c7c35) SHA1(b51265f4d9e5a8cf9d53099a97cadd25ea0b34ce) )
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ROM_LOAD( "br_pv03", 0x1000, 0x0800, CRC(dffd04b9) SHA1(d51a0f27e90b0a49cf2d57ec82a863dcae9f3ea4) )
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ROM_LOAD( "br_pv04", 0x1800, 0x0800, CRC(b0626aff) SHA1(b7de6c21030732bd0479228f057ca4c87b913b0a) )
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@ -3439,7 +3432,7 @@ GAME( 1978, lrescuem, lrescue, lrescue, lrescue, 0, ROT270, "bootleg (Model R
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GAME( 1979, grescue, lrescue, lrescue, lrescue, 0, ROT270, "Taito (Universal license?)", "Galaxy Rescue", GAME_SUPPORTS_SAVE | GAME_IMPERFECT_SOUND )
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GAME( 1979, desterth, lrescue, lrescue, invrvnge, 0, ROT270, "bootleg", "Destination Earth", GAME_SUPPORTS_SAVE | GAME_IMPERFECT_SOUND )
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GAME( 1979, invadpt2, 0, invadpt2, invadpt2, 0, ROT270, "Taito", "Space Invaders Part II (Taito)", GAME_SUPPORTS_SAVE | GAME_IMPERFECT_SOUND )
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GAME( 1979, invadpt2br,invadpt2,invadpt2, invadpt2, invadpt2br, ROT270, "Taito do Brasil", "Space Invaders Part II (Brazil)", GAME_SUPPORTS_SAVE | GAME_IMPERFECT_SOUND )
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GAME( 1979, invadpt2br,invadpt2,invadpt2, invadpt2, 0, ROT270, "Taito do Brasil", "Space Invaders Part II (Brazil)", GAME_SUPPORTS_SAVE | GAME_IMPERFECT_SOUND )
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GAME( 1980, invaddlx, invadpt2, invaders, invadpt2, 0, ROT270, "Taito (Midway license)", "Space Invaders Deluxe", GAME_SUPPORTS_SAVE )
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GAME( 1980, vortex, 0, vortex, vortex, vortex, ROT270, "Zilec Electronics", "Vortex", GAME_IMPERFECT_COLORS | GAME_SUPPORTS_SAVE | GAME_IMPERFECT_SOUND ) /* Encrypted 8080/IO */
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GAME( 1979, cosmo, 0, cosmo, cosmo, 0, ROT90, "TDS & Mints", "Cosmo", GAME_SUPPORTS_SAVE | GAME_IMPERFECT_SOUND )
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