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igs017.cpp: hopefully completed decryptions for tarzanc and tarzana. The former probably needs just the correct parameters for the IGS0031 protection, the latter has additional IGS0029 protection (nw)

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This commit is contained in:
Ivan Vangelista 2020-04-10 10:18:48 +02:00
parent 812a085831
commit f5ec99f06c
1 changed files with 57 additions and 37 deletions
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94
src/mame/drivers/igs017.cpp
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@ -24,8 +24,8 @@ Year + Game PCB CPU Sound Custom
98 Mj Man Guan Caishen NO-0192-1 68000 M6295 IGS017 IGS025 IGS029 Battery
99 Tarzan (V107) NO-0228? Z180 M6295 IGS031 IGS025 IGS029 Battery
99 Tarzan (V109C) NO-0248-1 Z180 M6295 IGS031 IGS025 Battery
9? Happy Skill (V611) NO-0281 Z180 M6295 (K668) IGS031 IGS025 Battery
00? Super Tarzan (V100I) NO-0230-1 Z180 M6295 IGS031 IGS025 Battery
01? Happy Skill (V611) NO-0281 Z180 M6295 (K668) IGS031 IGS025 Battery
?? Super Poker / Formosa NO-0187 Z180 M6295 YM2413 IGS017 IGS025 Battery
-------------------------------------------------------------------------------------------------------------
* not present in one set
@ -891,46 +891,34 @@ void igs017_state::tarzan_decrypt_tiles()
}
}
// decryption is incomplete, the first part of code doesn't seem right.
// decryption should be good
void igs017_state::tarzan_decrypt_program_rom()
{
u16 *ROM = (u16 *)memregion("maincpu")->base();
int size = 0x40000;
u8 *rom = memregion("maincpu")->base();
for(int i=0; i<size/2; i++)
for (int i = 0; i < 0x40000; i++)
{
u16 x = ROM[i];
u8 x = rom[i];
if ((i & 0x10c0) == 0x0000)
x ^= 0x0001;
if ((i & 0x0010) == 0x0010 || (i & 0x0130) == 0x0020)
x ^= 0x0404;
if ((i & 0x00d0) != 0x0010)
x ^= 0x1010;
if (((i & 0x0008) == 0x0008)^((i & 0x10c0) == 0x0000))
x ^= 0x0100;
ROM[i] = x;
}
}
// by iq_132
void igs017_state::tarzana_decrypt_program_rom()
{
u8 *ROM = memregion("maincpu")->base();
int size = 0x80000;
for (int i = 0; i < size; i++)
{
u8 x = 0;
if ((i & 0x00011) == 0x00011) x ^= 0x01;
if ((i & 0x02180) == 0x00000) x ^= 0x01;
if ((i & 0x001a0) != 0x00020) x ^= 0x20;
if ((i & 0x00260) != 0x00200) x ^= 0x40;
if ((i & 0x00060) != 0x00000 && (i & 0x00260) != 0x00240) x ^= 0x80;
ROM[i] ^= x;
if ((i & 0x001a0) != 0x00020) x ^= 0x04;
if ((i & 0x00080) != 0x00080) x ^= 0x10;
if ((i & 0x000e0) == 0x000c0) x ^= 0x10;
m_decrypted_opcodes[i] = x;
}
for (int i = 0; i < 0x40000; i++)
{
u8 x = rom[i];
if ((i & 0x00011) == 0x00011) x ^= 0x01;
if ((i & 0x02180) == 0x00000) x ^= 0x01;
if (((i & 0x00020) == 0x00020) || ((i & 0x000260) == 0x00040)) x ^= 0x04;
if ((i & 0x001a0) != 0x00020) x ^= 0x10;
rom[i] = x;
}
}
@ -940,6 +928,38 @@ void igs017_state::init_tarzan()
tarzan_decrypt_tiles();
}
void igs017_state::tarzana_decrypt_program_rom()
{
u8 *rom = memregion("maincpu")->base();
for (int i = 0; i < 0x40000; i++)
{
u8 x = rom[i];
if ((i & 0x00011) == 0x00011) x ^= 0x01;
if ((i & 0x02180) == 0x00000) x ^= 0x01;
if ((i & 0x00080) != 0x00080) x ^= 0x20;
if ((i & 0x000e0) == 0x000c0) x ^= 0x20;
if ((i & 0x00280) != 0x00080) x ^= 0x40;
if ((i & 0x001a0) != 0x00020) x ^= 0x80;
m_decrypted_opcodes[i] = x;
}
for (int i = 0; i < 0x40000; i++) // by iq132
{
u8 x = rom[i];
if ((i & 0x00011) == 0x00011) x ^= 0x01;
if ((i & 0x02180) == 0x00000) x ^= 0x01;
if ((i & 0x001a0) != 0x00020) x ^= 0x20;
if ((i & 0x00260) != 0x00200) x ^= 0x40;
if ((i & 0x00060) != 0x00000 && (i & 0x00260) != 0x00240) x ^= 0x80;
rom[i] = x;
}
}
void igs017_state::init_tarzana()
{
tarzana_decrypt_program_rom();
@ -4711,9 +4731,9 @@ GAME( 1998, mgcs, 0, mgcs, mgcs, igs017_state, init_mgcs,
GAME( 1998, lhzb2, 0, lhzb2, lhzb2, igs017_state, init_lhzb2, ROT0, "IGS", "Mahjong Long Hu Zhengba 2 (set 1)", MACHINE_NOT_WORKING | MACHINE_UNEMULATED_PROTECTION )
GAME( 1998, lhzb2a, lhzb2, lhzb2a, lhzb2a, igs017_state, init_lhzb2a, ROT0, "IGS", "Mahjong Long Hu Zhengba 2 (VS221M)", 0 )
GAME( 1998, slqz2, 0, slqz2, slqz2, igs017_state, init_slqz2, ROT0, "IGS", "Mahjong Shuang Long Qiang Zhu 2 (VS203J)", MACHINE_NOT_WORKING | MACHINE_UNEMULATED_PROTECTION )
GAME( 1999, tarzanc, 0, iqblocka, iqblocka, igs017_state, init_tarzan, ROT0, "IGS", "Tarzan Chuang Tian Guan (V109C, set 1)", MACHINE_NOT_WORKING )
GAME( 1999, tarzan, tarzanc, iqblocka, iqblocka, igs017_state, init_tarzan, ROT0, "IGS", "Tarzan Chuang Tian Guan (V109C, set 2)", MACHINE_NOT_WORKING )
GAME( 1999, tarzana, tarzanc, iqblocka, iqblocka, igs017_state, init_tarzana, ROT0, "IGS", "Tarzan (V107)", MACHINE_NOT_WORKING )
GAME( 1999, tarzanc, 0, starzan, iqblocka, igs017_state, init_tarzan, ROT0, "IGS", "Tarzan Chuang Tian Guan (V109C, set 1)", MACHINE_NOT_WORKING ) // IGS031 protection's game specific parameters not emulated yet
GAME( 1999, tarzan, tarzanc, starzan, iqblocka, igs017_state, init_tarzan, ROT0, "IGS", "Tarzan Chuang Tian Guan (V109C, set 2)", MACHINE_NOT_WORKING ) // IGS031 protection's game specific parameters not emulated yet
GAME( 1999, tarzana, tarzanc, starzan, iqblocka, igs017_state, init_tarzana, ROT0, "IGS", "Tarzan (V107)", MACHINE_NOT_WORKING | MACHINE_UNEMULATED_PROTECTION ) // IGS029 needs to be emulated
GAME( 2000?, starzan, 0, starzan, iqblocka, igs017_state, init_starzan, ROT0, "IGS (G.F. Gioca license)", "Super Tarzan (Italy, V100I)", MACHINE_NOT_WORKING )
GAME( 2001?, happyskl, 0, starzan, iqblocka, igs017_state, init_happyskl, ROT0, "IGS", "Happy Skill (Italy, V611IT)", MACHINE_NOT_WORKING ) // IGS031 protection's game specific parameters not emulated yet