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cosmigc.cpp: protection as bit-flip [nw]

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This commit is contained in:
Peter Ferrie 2022-01-05 13:09:16 -08:00
parent 63f576f37c
commit e3dd4594c4
1 changed files with 6 additions and 6 deletions
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12
src/mame/drivers/cosmicg.cpp
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@ -415,6 +415,12 @@ void cosmicg_state::init_cosmicg()
/* Program ROMs have data pins connected different from normal */
offs_t len = memregion("program")->bytes();
u8 *rom = memregion("program")->base();
/* convert dummy instruction to meaningful one */
rom[0x1e9b] ^= 0x20;
rom[0x1e9f] ^= 0x20;
for (offs_t offs = 0; offs < len; offs++)
{
u8 scrambled = rom[offs];
@ -426,12 +432,6 @@ void cosmicg_state::init_cosmicg()
rom[offs] = normal;
}
/* Patch to avoid crash - Seems like duff romcheck routine */
/* I would expect it to be bitrot, but have two romsets */
/* from different sources with the same problem! */
rom[0x1e9e] = 0x04;
rom[0x1e9f] = 0xc0;
}