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pengo.cpp: decrypted schick, though it could probably be simplified. The first 0x8000 are very very similar to Penta, so the differences seem to lie in the 0xe000-0xffff area (nw)

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This commit is contained in:
Ivan Vangelista 2019-04-05 19:59:45 +02:00
parent 85cd7914aa
commit 335b6123e4
1 changed files with 62 additions and 10 deletions
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72
src/mame/drivers/pengo.cpp
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@ -91,6 +91,7 @@ public:
void schick(machine_config &config);
void init_penta();
void init_schick();
private:
DECLARE_WRITE_LINE_MEMBER(coin_counter_1_w);
@ -901,6 +902,57 @@ void pengo_state::init_penta()
}
}
void pengo_state::init_schick()
{
static const uint8_t data_xortable[4][8] =
{
{ 0xf1,0xd3,0x79,0x5b,0xd3,0xf1,0x5b,0x79 }, /* .......0.......0 */
{ 0xd9,0x5b,0xd3,0x51,0xd9,0x5b,0xd3,0x51 }, /* .......0.......1 */
{ 0xe1,0xc3,0x69,0x4b,0xc3,0xe1,0x4b,0x69 }, /* .......1.......0 */
{ 0xc9,0x4b,0xc3,0x41,0xc9,0x4b,0xc3,0x41 } /* .......1.......1 */
};
static const uint8_t opcode_xortable[8][8] =
{
{ 0x53,0x59,0x7b,0x71,0x71,0x7b,0x59,0x53 }, /* ...0...0...0.... */
{ 0xd9,0xd9,0x51,0x51,0xd9,0xd9,0x51,0x51 }, /* ...0...0...1.... */
{ 0xc9,0x4b,0xc3,0x41,0xe1,0x63,0xeb,0x69 }, /* ...0...1...0.... */
{ 0xc9,0x4b,0xc3,0x41,0xe1,0x63,0xeb,0x69 }, /* ...0...1...1.... */
{ 0x7b,0x59,0x7b,0x59,0xdb,0xf9,0xdb,0xf9 }, /* ...1...0...0.... */
{ 0x7b,0x59,0x7b,0x59,0xdb,0xf9,0xdb,0xf9 }, /* ...1...0...1.... */
{ 0xc9,0x4b,0xc3,0x41,0xe1,0x63,0xeb,0x69 }, /* ...1...1...0.... */
{ 0xc9,0x4b,0xc3,0x41,0xe1,0x63,0xeb,0x69 } /* ...1...1...1.... */
};
uint8_t *rom = memregion("maincpu")->base();
for (int A = 0x0000;A < 0x10000;A++)
{
uint8_t src = rom[A];
/* pick the translation table from bits 0 and 8 of the address */
int i = (A & 1) + (((A >> 8) & 1) << 1);
/* pick the offset in the table from bits 1, 3 and 5 of the source data */
int j = ((src >> 1) & 1) + (((src >> 3) & 1) << 1) + (((src >> 5) & 1) << 2);
/* the bottom half of the translation table is the mirror image of the top */
if (src & 0x80) j = 7 - j;
/* decode the ROM data */
if (BIT(i, 1))
rom[A] = bitswap<8>(src ^ data_xortable[i][j], 7, 4, 5, 6, 3, 2, 1, 0);
else
rom[A] = bitswap<8>(src ^ data_xortable[i][j], 7, 6, 5, 0, 3, 2, 1, 4);
/* now decode the opcodes */
/* pick the translation table from bits 4, 8 and 12 of the address */
i = ((A >> 4) & 1) + (((A >> 8) & 1) << 1) + (((A >> 12) & 1) << 2);
if (BIT(i, 1))
m_decrypted_opcodes[A] = bitswap<8>(src ^ opcode_xortable[i][j], 7, 4, 5, 6, 3, 2, 1, 0);
else
m_decrypted_opcodes[A] = bitswap<8>(src ^ opcode_xortable[i][j], 7, 6, 5, 0, 3, 2, 1, 4);
}
}
/*************************************
*
@ -908,13 +960,13 @@ void pengo_state::init_penta()
*
*************************************/
GAME( 1982, pengo, 0, pengoe, pengo, pengo_state, empty_init, ROT90, "Sega", "Pengo (set 1 rev c)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, pengo2, pengo, pengoe, pengo, pengo_state, empty_init, ROT90, "Sega", "Pengo (set 2)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, pengo2u, pengo, pengou, pengo, pengo_state, empty_init, ROT90, "Sega", "Pengo (set 2 not encrypted)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, pengo3u, pengo, pengou, pengo, pengo_state, empty_init, ROT90, "Sega", "Pengo (set 3 not encrypted)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, pengo4, pengo, pengoe, pengo, pengo_state, empty_init, ROT90, "Sega", "Pengo (set 4)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, pengo5, pengo, pengoe, pengo, pengo_state, empty_init, ROT90, "Sega", "Pengo (set 5)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, pengob, pengo, pengo, pengo, pengo_state, init_penta, ROT90, "bootleg", "Pengo (bootleg)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, penta, pengo, pengo, pengo, pengo_state, init_penta, ROT90, "bootleg (Grinbee Shouji)", "Penta", MACHINE_SUPPORTS_SAVE ) // Grinbee Shouji was a subsidiary of Orca
GAME( 1983, jrpacmbl, jrpacman, jrpacmbl, jrpacmbl, pengo_state, empty_init, ROT90, "bootleg", "Jr. Pac-Man (Pengo hardware)", MACHINE_NO_COCKTAIL | MACHINE_SUPPORTS_SAVE )
GAME( 1988, schick, 0, schick, schick, pengo_state, empty_init, ROT90, "Microhard", "Super Chick", MACHINE_NOT_WORKING | MACHINE_SUPPORTS_SAVE ) // encrypted, scheme suspected similar to the Penta one
GAME( 1982, pengo, 0, pengoe, pengo, pengo_state, empty_init, ROT90, "Sega", "Pengo (set 1 rev c)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, pengo2, pengo, pengoe, pengo, pengo_state, empty_init, ROT90, "Sega", "Pengo (set 2)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, pengo2u, pengo, pengou, pengo, pengo_state, empty_init, ROT90, "Sega", "Pengo (set 2 not encrypted)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, pengo3u, pengo, pengou, pengo, pengo_state, empty_init, ROT90, "Sega", "Pengo (set 3 not encrypted)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, pengo4, pengo, pengoe, pengo, pengo_state, empty_init, ROT90, "Sega", "Pengo (set 4)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, pengo5, pengo, pengoe, pengo, pengo_state, empty_init, ROT90, "Sega", "Pengo (set 5)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, pengob, pengo, pengo, pengo, pengo_state, init_penta, ROT90, "bootleg", "Pengo (bootleg)", MACHINE_SUPPORTS_SAVE )
GAME( 1982, penta, pengo, pengo, pengo, pengo_state, init_penta, ROT90, "bootleg (Grinbee Shouji)", "Penta", MACHINE_SUPPORTS_SAVE ) // Grinbee Shouji was a subsidiary of Orca
GAME( 1983, jrpacmbl, jrpacman, jrpacmbl, jrpacmbl, pengo_state, empty_init, ROT90, "bootleg", "Jr. Pac-Man (Pengo hardware)", MACHINE_NO_COCKTAIL | MACHINE_SUPPORTS_SAVE )
GAME( 1988, schick, 0, schick, schick, pengo_state, init_schick, ROT90, "Microhard", "Super Chick", MACHINE_NOT_WORKING | MACHINE_SUPPORTS_SAVE ) // encrypted, scheme suspected similar to the Penta one