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goldstar.cpp: very preliminary and incomplete data decryption for wcat3 (nw)

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This commit is contained in:
Ivan Vangelista 2019-11-01 18:06:00 +01:00
parent 23c3ee5607
commit 7ea9ee947b
2 changed files with 33 additions and 1 deletions
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33
src/mame/drivers/goldstar.cpp
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@ -9275,6 +9275,7 @@ void wingco_state::wcat3(machine_config &config)
/* basic machine hardware */
Z80(config, m_maincpu, CPU_CLOCK);
m_maincpu->set_addrmap(AS_PROGRAM, &wingco_state::wcat3_map);
m_maincpu->set_addrmap(AS_OPCODES, &wingco_state::super972_decrypted_opcodes_map);
//m_maincpu->set_addrmap(AS_IO, &wingco_state::goldstar_readport);
I8255A(config, m_ppi[0]);
@ -16903,6 +16904,36 @@ void goldstar_state::init_ladylinre()
}
}
void wingco_state::init_wcat3()
{
// the following is very preliminary and only good to decrypt text strings. Treat everything as incomplete and probably incorrect.
uint8_t *rom = memregion("maincpu")->base();
for (int i = 0x0000; i < 0x10000; i++)
{
uint8_t x = rom[i];
m_decrypted_opcodes[i] = x;
}
// data encryption seems to involve only bits 4, 5 and 7 and some conditional XORs
for (int i = 0x4000; i < 0x10000; i++)
{
uint8_t x = rom[i];
switch (i & 0x405)
{
case 0x001: x = bitswap<8>(BIT(x, 6) ? x ^ 0x10 : x, 5, 6, 7, 4, 3, 2, 1, 0); break;
case 0x004: x = bitswap<8>(!BIT(x, 7) ? x ^ 0x20 : x, 4, 6, 5, 7, 3, 2, 1, 0); break;
case 0x005: x = bitswap<8>(BIT(x, 7) ? x ^ 0x80 : x, 7, 6, 4, 5, 3, 2, 1, 0); break;
case 0x401: x = bitswap<8>(!BIT(x, 7) ? x ^ 0x10 : x, 5, 6, 7, 4, 3, 2, 1, 0); break;
case 0x404: x = bitswap<8>(x, 4, 6, 5, 7, 3, 2, 1, 0); break;
case 0x405: x = bitswap<8>(x, 4, 6, 5, 7, 3, 2, 1, 0); break;
}
rom[i] = x;
}
}
// this block swapping is the same for chry10, chrygld and cb3
// the underlying bitswaps / xors are different however
@ -17899,7 +17930,7 @@ GAME( 198?, ladylinrb, ladylinr, ladylinrb,ladylinr, goldstar_state, init_ladyl
GAME( 198?, ladylinrc, ladylinr, ladylinrb,ladylinr, goldstar_state, init_ladylinrc, ROT0, "TAB Austria", "Lady Liner (encrypted, set 2)", 0 )
GAME( 198?, ladylinrd, ladylinr, ladylinrb,ladylinr, goldstar_state, init_ladylinrd, ROT0, "TAB Austria", "Lady Liner (encrypted, set 3)", 0 )
GAME( 198?, ladylinre, ladylinr, ladylinrb,ladylinr, goldstar_state, init_ladylinre, ROT0, "TAB Austria", "Lady Liner (encrypted, set 4)", 0 )
GAME( 198?, wcat3, 0, wcat3, lucky8, wingco_state, empty_init, ROT0, "E.A.I.", "Wild Cat 3", MACHINE_NOT_WORKING )
GAME( 198?, wcat3, 0, wcat3, lucky8, wingco_state, init_wcat3, ROT0, "E.A.I.", "Wild Cat 3", MACHINE_NOT_WORKING )
GAME( 1985, luckylad, 0, lucky8, luckylad, wingco_state, init_luckylad, ROT0, "Wing Co., Ltd.", "Lucky Lady (Wing, encrypted)", MACHINE_NOT_WORKING ) // encrypted (see notes in rom_load)...
GAME( 1991, megaline, 0, megaline, megaline, unkch_state, empty_init, ROT0, "Fun World", "Mega Lines", MACHINE_NOT_WORKING )

1
src/mame/includes/goldstar.h
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@ -225,6 +225,7 @@ public:
void init_flam7_tw();
void init_luckylad();
void init_super972();
void init_wcat3();
DECLARE_VIDEO_START(bingowng);
DECLARE_VIDEO_START(magical);