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skeleton/sterz80.cpp: descrambled Oki ROM

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Ivan Vangelista 2024-03-28 18:33:26 +01:00
parent f214669ccb
commit 0c166ae47e
1 changed files with 10 additions and 1 deletions
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11
src/mame/skeleton/sterz80.cpp
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@ -195,7 +195,16 @@ void sterz80_state::init_tongzi()
// by bits 0, 1, 4, 5, 6 and 7 of the address, the data bitswaps by bits 0 and 1 of the address.
// decrypt M6295 ROM
// TODO
uint8_t *okirom = memregion("oki")->base();
std::vector<uint8_t> buffer(0x40000);
memcpy(&buffer[0], okirom, 0x40000);
for (int i = 0; i < 0x40000; i++)
{
okirom[i] = buffer[bitswap<24>(i, 23, 22, 21, 20, 19, 18, 4, 3, 1, 2, 5, 0, 10, 13, 8, 6, 15, 17, 7, 9, 12, 14, 11, 16)];
okirom[i] = bitswap<8>(okirom[i], 0, 1, 2, 3, 4, 5, 6, 7);
}
}
} // anonymous namespace