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(MESS) snes.c: fixed SRAM issues. [Fabio Priuli]

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This commit is contained in:
Fabio Priuli 2012-10-04 06:11:20 +00:00
parent 20c1bc4162
commit b97646f663
1 changed files with 8 additions and 8 deletions
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16
src/mame/machine/snes.c
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@ -922,8 +922,8 @@ READ8_HANDLER( snes_r_bank2 )
{ {
/* Donkey Kong Country checks this and detects a copier if 0x800 is not masked out due to sram size */ /* Donkey Kong Country checks this and detects a copier if 0x800 is not masked out due to sram size */
/* OTOH Secret of Mana does not work properly if sram is not mirrored on later banks */ /* 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 */ int mask = (state->m_cart[0].sram - 1) & 0x7fff; /* Limit SRAM size to what's actually present */
value = snes_ram[0x300000 + (offset & mask)]; value = snes_ram[0x306000 + ((offset - 0x6000) & mask)];
} }
else else
{ {
@ -1082,8 +1082,8 @@ READ8_HANDLER( snes_r_bank6 )
value = space.read_byte(offset); value = space.read_byte(offset);
else if ((offset >= 0x300000) && (state->m_cart[0].sram > 0)) else if ((offset >= 0x300000) && (state->m_cart[0].sram > 0))
{ {
int mask = (state->m_cart[0].sram - 1) | 0xff0000; /* Limit SRAM size to what's actually present */ int mask = (state->m_cart[0].sram - 1) & 0x7fff; /* Limit SRAM size to what's actually present */
value = snes_ram[0x800000 + (offset & mask)]; value = snes_ram[0xb06000 + ((offset - 0x6000) & mask)];
} }
else /* Area 0x6000-0x8000 with offset < 0x300000 is reserved */ else /* Area 0x6000-0x8000 with offset < 0x300000 is reserved */
{ {
@ -1249,8 +1249,8 @@ WRITE8_HANDLER( snes_w_bank2 )
{ {
/* Donkey Kong Country checks this and detects a copier if 0x800 is not masked out due to sram size */ /* Donkey Kong Country checks this and detects a copier if 0x800 is not masked out due to sram size */
/* OTOH Secret of Mana does not work properly if sram is not mirrored on later banks */ /* 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 */ int mask = (state->m_cart[0].sram - 1) & 0x7fff; /* Limit SRAM size to what's actually present */
snes_ram[0x300000 + (offset & mask)] = data; snes_ram[0x306000 + ((offset - 0x6000) & mask)] = data;
} }
else else
logerror("snes_w_bank2: Attempt to write to reserved address: %X = %02x\n", offset + 0x300000, data); logerror("snes_w_bank2: Attempt to write to reserved address: %X = %02x\n", offset + 0x300000, data);
@ -1353,8 +1353,8 @@ WRITE8_HANDLER( snes_w_bank6 )
space.write_byte(offset, data); space.write_byte(offset, data);
else if ((offset >= 0x300000) && (state->m_cart[0].sram > 0)) else if ((offset >= 0x300000) && (state->m_cart[0].sram > 0))
{ {
int mask = (state->m_cart[0].sram - 1) | 0xff0000; /* Limit SRAM size to what's actually present */ int mask = (state->m_cart[0].sram - 1) & 0x7fff; /* Limit SRAM size to what's actually present */
snes_ram[0x800000 + (offset & mask)] = data; snes_ram[0xb06000 + ((offset - 0x6000) & mask)] = data;
} }
else /* Area in 0x6000-0x8000 && offset < 0x300000 is Reserved! */ else /* Area in 0x6000-0x8000 && offset < 0x300000 is Reserved! */
logerror("snes_w_bank6: Attempt to write to reserved address: %X = %02x\n", offset + 0x800000, data); logerror("snes_w_bank6: Attempt to write to reserved address: %X = %02x\n", offset + 0x800000, data);