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galaxian.c (froggermc): fixed MT00100 (nw)

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sound doesn't cut off anymore after starting a game, but it surely isn't perfect. Should be checked against 0.37b15 if there's another regression or if it was this way even then.
This commit is contained in:
Ivan Vangelista 2015-10-14 17:31:35 +02:00
parent df25fa2351
commit 9069e83f96
2 changed files with 14 additions and 2 deletions
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15
src/mame/drivers/galaxian.c
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@ -5758,7 +5758,18 @@ void galaxian_state::decode_frogger_sound()
UINT32 offs; UINT32 offs;
/* the first ROM of the sound CPU has data lines D0 and D1 swapped */ /* the first ROM of the sound CPU has data lines D0 and D1 swapped */
for (offs = 0; offs < 0x0800; offs++) for (offs = 0; offs < 0x800; offs++)
rombase[offs] = BITSWAP8(rombase[offs], 7,6,5,4,3,2,0,1);
}
// froggrmc has a bigger first ROM of the sound CPU, thus a different decode
void galaxian_state::decode_froggermc_sound()
{
UINT8 *rombase = memregion("audiocpu")->base();
UINT32 offs;
/* the first ROM of the sound CPU has data lines D0 and D1 swapped */
for (offs = 0; offs < 0x1000; offs++)
rombase[offs] = BITSWAP8(rombase[offs], 7,6,5,4,3,2,0,1); rombase[offs] = BITSWAP8(rombase[offs], 7,6,5,4,3,2,0,1);
} }
@ -6592,7 +6603,7 @@ DRIVER_INIT_MEMBER(galaxian_state,froggrmc)
space.install_ram(0x8000, 0x87ff); space.install_ram(0x8000, 0x87ff);
/* decrypt */ /* decrypt */
decode_frogger_sound(); decode_froggermc_sound();
} }

1
src/mame/includes/galaxian.h
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@ -313,6 +313,7 @@ public:
void decode_checkman(); void decode_checkman();
void decode_dingoe(); void decode_dingoe();
void decode_frogger_sound(); void decode_frogger_sound();
void decode_froggermc_sound();
void decode_frogger_gfx(); void decode_frogger_gfx();
void decode_anteater_gfx(); void decode_anteater_gfx();
void decode_losttomb_gfx(); void decode_losttomb_gfx();