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magreel.cpp: redumped ic24 [Team Europe]

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This commit is contained in:
Ivan Vangelista 2021-03-31 18:33:05 +02:00
parent 593ce66eb2
commit ad07c7d0c1
1 changed files with 18 additions and 4 deletions
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22
src/mame/drivers/magreel.cpp
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@ -147,7 +147,7 @@ void magreel_state::magreel(machine_config &config)
// screen.set_screen_update(FUNC(magreel_state::screen_update));
// screen.set_size(32*8, 32*8);
// screen.set_visarea(0*8, 32*8-1, 0*8, 32*8-1);
// screen.set_raw(58_MHz_XTAL / 2, 442, 0, 320, 264, 0, 240); /* generic NTSC video timing at 320x240 */
// screen.set_raw(58_MHz_XTAL / 2, 442, 0, 320, 264, 0, 240); // generic NTSC video timing at 320x240
// screen.set_palette("palette");
// GFXDECODE(config, "gfxdecode", "palette", gfx_magreel);
@ -167,7 +167,7 @@ void magreel_state::magreel(machine_config &config)
ROM_START( magreel )
ROM_REGION( 0x100000, "maincpu", 0 )
ROM_LOAD( "m27c800ic18", 0x000000, 0x100000, CRC(2af3d8e7) SHA1(729cd2c1011d8018cf8d77c2d118d1815e30f475) ) // TODO: figure out the line swapping
ROM_LOAD( "m27c800.ic18", 0x000000, 0x100000, CRC(2af3d8e7) SHA1(729cd2c1011d8018cf8d77c2d118d1815e30f475) ) // TODO: figure out the line swapping
ROM_REGION( 0x4000, "pic", ROMREGION_ERASEFF )
ROM_LOAD( "pic16c621", 0x0000, 0x4000, NO_DUMP ) // read protected
@ -179,7 +179,7 @@ ROM_START( magreel )
ROM_LOAD( "m27c160.ic6", 0x600000, 0x200000, CRC(0f3274d0) SHA1(1abb45ebc74a09f1832cf80775a35966e8d5cd84) )
ROM_REGION( 0x200000, "flash", 0 )
ROM_LOAD( "mx29f161.ic24",0x000000, 0x200000, CRC(61accab0) SHA1(0fee6bf6071849d1b00fbfc248ab654a8abc3b99) ) // FIXED BITS (xxxxxxxxxxxxxxx0)
ROM_LOAD( "mx29f161.ic24",0x000000, 0x200000, CRC(b479c2db) SHA1(cac4c38ef26d307bfd3ffff77859ea90cf554418) )
ROM_REGION( 0x4000, "eeproms", 0 )
ROM_LOAD( "m28c64.ic19", 0x000000, 0x002000, CRC(d0238e5c) SHA1(513bb97487d33c3b844877104bb2af3220851583) )
@ -189,7 +189,21 @@ ROM_END
void magreel_state::init_magreel()
{
// TODO: decryption
uint8_t *rom = memregion("maincpu")->base();
std::vector<uint8_t> buffer(0x100000);
memcpy(&buffer[0], rom, 0x100000);
// descramble address. TODO: gives M68000-looking code structure, but probably isn't correct
for (int i = 0; i < 0x100000; i++)
rom[i] = buffer[bitswap<24>(i, 23, 22, 21, 20, 19, 16, 17, 18, 1, 3, 2, 4, 7, 5, 6, 8, 9, 10, 11, 14, 12, 13, 15, 0)];
uint16_t *rom16 = (uint16_t *)memregion("maincpu")->base();
// descramble data. TODO: everything
for (int i = 0; i < 0x100000 / 2; i++)
rom16[i] = bitswap<16>(rom16[i] ^ 0x0000, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0);
}
} // Anonymous namespace