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fixed a SRAM issue with SNES. no whatsnew. (credited in MESS)

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This commit is contained in:
Fabio Priuli 2011-11-15 13:52:36 +00:00
parent a1a413a621
commit 2eaa06af74
1 changed files with 6 additions and 4 deletions
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10
src/mame/machine/snes.c
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@ -1050,8 +1050,9 @@ READ8_HANDLER( snes_r_bank2 )
} }
else if ((state->m_cart[0].mode == SNES_MODE_21) && (state->m_cart[0].sram > 0)) else if ((state->m_cart[0].mode == SNES_MODE_21) && (state->m_cart[0].sram > 0))
{ {
/* Donkey Kong Country checks this */ /* Donkey Kong Country checks this and detects a copier if 0x800 is not masked out due to sram size */
int mask = state->m_cart[0].sram - 1; /* Limit SRAM size to what's actually present */ /* OTOH Secret of Mana does not work properly if sram is not mirrored on later banks */
int mask = (state->m_cart[0].sram - 1) | 0xffe000; /* Limit SRAM size to what's actually present */
value = snes_ram[0x300000 + (offset & mask)]; value = snes_ram[0x300000 + (offset & mask)];
} }
else else
@ -1411,8 +1412,9 @@ WRITE8_HANDLER( snes_w_bank2 )
} }
else if ((state->m_cart[0].mode == SNES_MODE_21) && (state->m_cart[0].sram > 0)) else if ((state->m_cart[0].mode == SNES_MODE_21) && (state->m_cart[0].sram > 0))
{ {
/* Donkey Kong Country checks this */ /* Donkey Kong Country checks this and detects a copier if 0x800 is not masked out due to sram size */
int mask = state->m_cart[0].sram - 1; /* Limit SRAM size to what's actually present */ /* OTOH Secret of Mana does not work properly if sram is not mirrored on later banks */
int mask = (state->m_cart[0].sram - 1) | 0xffe000; /* Limit SRAM size to what's actually present */
snes_ram[0x300000 + (offset & mask)] = data; snes_ram[0x300000 + (offset & mask)] = data;
} }
else else