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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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This commit is contained in:
Michaël Banaan Ananas 2012-03-17 17:49:40 +00:00
parent f2e6b43b94
commit 3a7c7781f5
1 changed files with 18 additions and 25 deletions
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43
src/mame/drivers/8080bw.c
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@ -402,29 +402,6 @@ static MACHINE_CONFIG_DERIVED_CLASS( invadpt2, mw8080bw_root, _8080bw_state )
MACHINE_CONFIG_END
static DRIVER_INIT( invadpt2br )
{
UINT8 *rom = machine.region("maincpu")->base();
int offs;
// simple encryption on rom pv01 0x4fc-0x5fb
// (with additional mask on 4-byte parts below)
for (offs = 0x4fc; offs < 0x5fc; offs++)
rom[offs] ^= 0x6c;
// 0x4fc + 1 * 0x56
for (offs = 0x54e; offs < 0x552; offs++)
rom[offs] ^= 0x03;
// 0x4fc + 2 * 0x56
for (offs = 0x5a4; offs < 0x5a8; offs++)
rom[offs] ^= 0x01;
// 0x4fc + 3 * 0x56
for (offs = 0x5fa; offs < 0x5fc; offs++)
rom[offs] ^= 0x02;
}
/*******************************************************/
/* */
/* Space Wars (Sanritsu) */
@ -2664,7 +2641,23 @@ ROM_END
ROM_START( invadpt2br )
ROM_REGION( 0x10000, "maincpu", 0 )
ROM_LOAD( "br_pv01", 0x0000, 0x0800, CRC(2931a033) SHA1(b04ccde4a4a04b37aa65edc4af4e53a8c1f03dfe) )
ROM_LOAD( "pv01", 0x0000, 0x0800, CRC(7288a511) SHA1(ff617872784c28ed03591aefa9f0519e5651701f) )
/* pv01 had weird encryption applied to it, very likely to have been done post-dump. */
// for (offs = 0x4fc; offs < 0x5fc; offs++)
// rom[offs] ^= 0x6c;
// 0x4fc + 1 * 0x56
// for (offs = 0x54e; offs < 0x552; offs++)
// rom[offs] ^= 0x03;
// 0x4fc + 2 * 0x56
// for (offs = 0x5a4; offs < 0x5a8; offs++)
// rom[offs] ^= 0x01;
// 0x4fc + 3 * 0x56
// for (offs = 0x5fa; offs < 0x5fc; offs++)
// rom[offs] ^= 0x02;
ROM_LOAD( "br_pv02", 0x0800, 0x0800, CRC(420c7c35) SHA1(b51265f4d9e5a8cf9d53099a97cadd25ea0b34ce) )
ROM_LOAD( "br_pv03", 0x1000, 0x0800, CRC(dffd04b9) SHA1(d51a0f27e90b0a49cf2d57ec82a863dcae9f3ea4) )
ROM_LOAD( "br_pv04", 0x1800, 0x0800, CRC(b0626aff) SHA1(b7de6c21030732bd0479228f057ca4c87b913b0a) )
@ -3439,7 +3432,7 @@ GAME( 1978, lrescuem, lrescue, lrescue, lrescue, 0, ROT270, "bootleg (Model R
GAME( 1979, grescue, lrescue, lrescue, lrescue, 0, ROT270, "Taito (Universal license?)", "Galaxy Rescue", GAME_SUPPORTS_SAVE | GAME_IMPERFECT_SOUND )
GAME( 1979, desterth, lrescue, lrescue, invrvnge, 0, ROT270, "bootleg", "Destination Earth", GAME_SUPPORTS_SAVE | GAME_IMPERFECT_SOUND )
GAME( 1979, invadpt2, 0, invadpt2, invadpt2, 0, ROT270, "Taito", "Space Invaders Part II (Taito)", GAME_SUPPORTS_SAVE | GAME_IMPERFECT_SOUND )
GAME( 1979, invadpt2br,invadpt2,invadpt2, invadpt2, invadpt2br, ROT270, "Taito do Brasil", "Space Invaders Part II (Brazil)", GAME_SUPPORTS_SAVE | GAME_IMPERFECT_SOUND )
GAME( 1979, invadpt2br,invadpt2,invadpt2, invadpt2, 0, ROT270, "Taito do Brasil", "Space Invaders Part II (Brazil)", GAME_SUPPORTS_SAVE | GAME_IMPERFECT_SOUND )
GAME( 1980, invaddlx, invadpt2, invaders, invadpt2, 0, ROT270, "Taito (Midway license)", "Space Invaders Deluxe", GAME_SUPPORTS_SAVE )
GAME( 1980, vortex, 0, vortex, vortex, vortex, ROT270, "Zilec Electronics", "Vortex", GAME_IMPERFECT_COLORS | GAME_SUPPORTS_SAVE | GAME_IMPERFECT_SOUND ) /* Encrypted 8080/IO */
GAME( 1979, cosmo, 0, cosmo, cosmo, 0, ROT90, "TDS & Mints", "Cosmo", GAME_SUPPORTS_SAVE | GAME_IMPERFECT_SOUND )