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alg.cpp: preliminary address lines descrambling for aplatoon

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This commit is contained in:
Ivan Vangelista 2021-03-09 18:28:48 +01:00
parent ec241db48e
commit d2259c9bc7
1 changed files with 7 additions and 14 deletions
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17
src/mame/drivers/alg.cpp
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@ -461,20 +461,13 @@ void alg_state::init_aplatoon()
{
init_ntsc();
// NOT DONE TODO FIGURE OUT THE RIGHT ORDER!!!!
uint8_t *rom = memregion("game_program")->base();
std::unique_ptr<uint8_t[]> decrypted = std::make_unique<uint8_t[]>(0x40000);
std::vector<uint8_t> buffer(0x40000);
static const int shuffle[] =
{
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,
32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63
};
memcpy(&buffer[0], rom, 0x40000);
for (int i = 0; i < 64; i++)
memcpy(decrypted.get() + i * 0x1000, rom + shuffle[i] * 0x1000, 0x1000);
memcpy(rom, decrypted.get(), 0x40000);
logerror("decrypt done\n ");
for (int i = 0; i < 0x40000; i++) // preliminary, believed ok but to be verified when the driver is fleshed out
rom[i] = buffer[bitswap<24>(i, 23, 22, 21, 20, 19, 18, 17, 13, 14, 15, 16, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)];
}
@ -944,7 +937,7 @@ GAME( 1995, fastdraw_130, fastdraw, alg_r2, alg_2p, alg_state, init_palr6,
// Works OK but uses right player (2) controls only for trigger and holster
// NOVA games on ALG hardware with own address scramble
GAME( 199?, aplatoon, alg_bios, alg_r2, alg, alg_state, init_aplatoon, ROT0, "Nova?", "Platoon V.3.1 US", MACHINE_NOT_WORKING | MACHINE_NO_SOUND | MACHINE_IMPERFECT_GRAPHICS )
GAME( 1995, aplatoon, alg_bios, alg_r2, alg, alg_state, init_aplatoon, ROT0, "Nova?", "Platoon V.3.1 US", MACHINE_NOT_WORKING | MACHINE_NO_SOUND | MACHINE_IMPERFECT_GRAPHICS )
// Web Picmatic games PAL TV standard or 100Hz, own ROM board
GAME( 1993, zortonbr_100, zortonbr, picmatic, alg, alg_state, init_pal, ROT0, "Web Picmatic", "Zorton Brothers v1.00 (Los Justicieros)", MACHINE_NOT_WORKING | MACHINE_NO_SOUND | MACHINE_IMPERFECT_GRAPHICS )