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another one. nw.

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This commit is contained in:
Fabio Priuli 2013-03-05 18:29:55 +00:00
parent 4f56eb9628
commit 91e4b64b05
1 changed files with 12 additions and 12 deletions
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24
src/mess/drivers/snes.c
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@ -69,6 +69,8 @@ public:
DECLARE_WRITE8_MEMBER(snes_input_read);
DECLARE_READ8_MEMBER(snes_oldjoy1_read);
DECLARE_READ8_MEMBER(snes_oldjoy2_read);
UINT8 m_sfx_ram[0x200000]; // or 0x100000?
};
/*************************************
@ -194,8 +196,8 @@ READ8_MEMBER( snes_console_state::snes_lo_r )
{
if (address >= 0x3000 && address < 0x3300)
return superfx_mmio_read(m_superfx, address);
if (address >= 0x6000 && address < 0x8000) // here it should be snes_ram[0xe00000+...] but there are mirroring issues
return superfx_access_ram(m_superfx) ? snes_ram[0xf00000 + (offset & 0x1fff)] : snes_open_bus_r(space, 0);
if (address >= 0x6000 && address < 0x8000)
return superfx_access_ram(m_superfx) ? m_sfx_ram[offset & 0x1fff] : snes_open_bus_r(space, 0);
}
if (m_has_addon_chip == HAS_SUPERFX && m_superfx != NULL
&& offset >= 0x400000 && offset < 0x600000)
@ -213,7 +215,7 @@ READ8_MEMBER( snes_console_state::snes_lo_r )
}
if (m_has_addon_chip == HAS_SUPERFX && m_superfx != NULL
&& offset >= 0x600000)
return superfx_access_ram(m_superfx) ? snes_ram[0x800000 + offset] : snes_open_bus_r(space, 0);
return superfx_access_ram(m_superfx) ? m_sfx_ram[offset & 0xfffff] : snes_open_bus_r(space, 0);
// base cart access
if (offset < 0x300000)
@ -366,12 +368,12 @@ WRITE8_MEMBER( snes_console_state::snes_lo_w )
{
if (address >= 0x3000 && address < 0x3300)
{ superfx_mmio_write(m_superfx, address, data); return; }
if (address >= 0x6000 && address < 0x8000) // here it should be snes_ram[0xe00000+...] but there are mirroring issues
{ snes_ram[0xf00000 + (offset & 0x1fff)] = data; return; }
if (address >= 0x6000 && address < 0x8000)
{ m_sfx_ram[offset & 0x1fff] = data; return; }
}
if (m_has_addon_chip == HAS_SUPERFX && m_superfx != NULL
&& offset >= 0x600000)
{ snes_ram[0x800000 + offset] = data; return; }
{ m_sfx_ram[offset & 0xfffff] = data; return; }
// base cart access
if (offset < 0x300000)
@ -476,19 +478,17 @@ READ8_MEMBER( snes_console_state::superfx_r_bank2 )
READ8_MEMBER( snes_console_state::superfx_r_bank3 )
{
/* IMPORTANT: SFX RAM sits in 0x600000-0x7fffff, and it's mirrored in 0xe00000-0xffffff. However, SNES
has only access to 0x600000-0x7dffff (because there is WRAM after that), hence we directly use the mirror
as the place where to write & read SFX RAM. SNES handlers have been setup accordingly. */
has only access to 0x600000-0x7dffff (because there is WRAM after that). */
//printf("superfx_r_bank3: %08x = %02x\n", offset, snes_ram[0xe00000 + offset]);
return snes_ram[0xe00000 + offset];
return m_sfx_ram[offset & 0xfffff];
}
WRITE8_MEMBER( snes_console_state::superfx_w_bank3 )
{
/* IMPORTANT: SFX RAM sits in 0x600000-0x7fffff, and it's mirrored in 0xe00000-0xffffff. However, SNES
has only access to 0x600000-0x7dffff (because there is WRAM after that), hence we directly use the mirror
as the place where to write & read SFX RAM. SNES handlers have been setup accordingly. */
has only access to 0x600000-0x7dffff (because there is WRAM after that). */
//printf("superfx_w_bank3: %08x = %02x\n", offset, data);
snes_ram[0xe00000 + offset] = data;
m_sfx_ram[offset & 0xfffff] = data;
}
/*************************************