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misc/matrix.cpp: preliminary (?) decryption

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This commit is contained in:
Ivan Vangelista 2024-02-20 18:22:48 +01:00
parent d3375e2e97
commit 395e02cfad
1 changed files with 20 additions and 2 deletions
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22
src/mame/misc/matrix.cpp
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@ -8,7 +8,7 @@ TODO:
- KBDC, not from super I/O; - KBDC, not from super I/O;
- Don't recognize an attached HDD, check default CMOS settings; - Don't recognize an attached HDD, check default CMOS settings;
- loops at PC=eda2d, reads the NMI vector; - loops at PC=eda2d, reads the NMI vector;
- game roms looks encrypted or bad, may require a missing boot device; - game ROMs are encrypted (currently at least partially decrypted), may require a missing boot device;
Hardware consists of: Hardware consists of:
@ -58,6 +58,8 @@ public:
void matrix(machine_config &config); void matrix(machine_config &config);
void init_decryption();
private: private:
required_device<cpu_device> m_maincpu; required_device<cpu_device> m_maincpu;
required_device<ds1287_device> m_rtc; required_device<ds1287_device> m_rtc;
@ -150,7 +152,23 @@ ROM_START( matrix )
ROM_LOAD( "matrix_031203u20.bin", 0x280000, 0x080000, CRC(f87ac4ae) SHA1(ef9b730a1113d36ef6a041fe36d77edfa255ad98) ) ROM_LOAD( "matrix_031203u20.bin", 0x280000, 0x080000, CRC(f87ac4ae) SHA1(ef9b730a1113d36ef6a041fe36d77edfa255ad98) )
ROM_END ROM_END
void matrix_state::init_decryption() // at least enough to see strings from various programs like DOS-C, PMODE/W, UPX, etc
{
uint8_t *rom = memregion("unsorted")->base();
std::vector<uint8_t> buffer(0x300000);
memcpy(&buffer[0], rom, 0x300000);
for (int i = 0; i < 0x300000; i++)
{
rom[i] = buffer[bitswap<24>(i, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 0, 9, 8, 7, 6, 5, 4, 3, 1, 10, 2)];
rom[i] = bitswap<8>(rom[i] ^ 0xda, 7, 6, 5, 4, 1, 2, 0, 3);
}
}
} // anonymous namespace } // anonymous namespace
GAME( 200?, matrix, 0, matrix, matrix, matrix_state, empty_init, ROT0, "<unknown>", "Matrix", MACHINE_NOT_WORKING | MACHINE_NO_SOUND ) GAME( 200?, matrix, 0, matrix, matrix, matrix_state, init_decryption, ROT0, "<unknown>", "Matrix", MACHINE_NOT_WORKING | MACHINE_NO_SOUND )