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[NSS/SNES] Sync Andreas Naive's latest DSP-1 emulation. Improves accuracy and documentation value.

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Please co-credit Andreas Naive.
This commit is contained in:
R. Belmont 2008-01-01 05:04:05 +00:00
parent ee69a1e9b9
commit bc7cef9498
2 changed files with 1446 additions and 1065 deletions
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57
src/mame/machine/snes.c
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@ -43,6 +43,7 @@ static emu_timer *snes_nmi_timer;
static emu_timer *snes_hirq_timer;
static UINT16 hblank_offset;
static UINT16 snes_htmult; /* in 512 wide, we run HTOTAL double and halve it on latching */
static UINT8 has_dsp1;
// full graphic variables
static UINT16 vram_fgr_high, vram_fgr_increment, vram_fgr_count, vram_fgr_mask, vram_fgr_shift, vram_read_buffer;
@ -279,8 +280,8 @@ static void snes_init_ram(void)
{
int i;
/* Init DSP1 interface */
InitDSP1();
/* Init DSP1 */
DSP1_reset();
/* Init VRAM */
memset( snes_vram, 0, SNES_VRAM_SIZE );
@ -436,27 +437,45 @@ READ8_HANDLER( snes_r_bank1 )
{
if ((address >= 0x8000) && (offset >= 0x200000))
{
return dsp1_read(address);
if (address >= 0xc000)
return DSP1_getSr();
else
return DSP1_getDr();
}
}
if( address <= 0x1fff ) /* Mirror of Low RAM */
{
return program_read_byte(0x7e0000 + address );
}
else if( address >= 0x2000 && address <= 0x5fff ) /* I/O */
{
return snes_r_io( address );
}
else if( address >= 0x6000 && address <= 0x7fff ) /* Reserved */
{
if( snes_cart.mode == SNES_MODE_20 )
return 0xff;
else
return dsp1_read(address);
{
return 0xff;
}
else
{
if (address >= 0x7000)
return DSP1_getSr();
else
return DSP1_getDr();
}
}
else
{
if( snes_cart.mode == SNES_MODE_20 )
{
return snes_ram[offset];
}
else /* MODE_21 */
{
return snes_ram[0xc00000 + offset];
}
}
return 0xff;
@ -471,7 +490,10 @@ READ8_HANDLER( snes_r_bank2 )
{
if (address >= 0x8000)
{
return dsp1_read(address);
if (address >= 0xc000)
return DSP1_getSr();
else
return DSP1_getDr();
}
}
@ -482,7 +504,9 @@ READ8_HANDLER( snes_r_bank2 )
else if( address >= 0x6000 && address <= 0x7fff )
{
if( snes_cart.mode == SNES_MODE_20 )
{
return 0xff; /* Reserved */
}
else /* MODE_21 */
{
int mask;
@ -533,7 +557,10 @@ READ8_HANDLER( snes_r_bank6 )
if (address < 0x8000)
{
return dsp1_read(address);
if (address >= 0x4000)
return DSP1_getSr();
else
return DSP1_getDr();
}
return 0xff;
@ -567,7 +594,7 @@ WRITE8_HANDLER( snes_w_bank1 )
if ((address >= 0x8000) && (offset >= 0x200000))
{
dsp1_write(address, data);
DSP1_setDr(data);
return;
}
@ -580,7 +607,7 @@ WRITE8_HANDLER( snes_w_bank1 )
logerror( "Attempt to write to reserved address: %X\n", offset );
else
{
dsp1_write(address, data);
DSP1_setDr(data);
return;
}
else
@ -594,7 +621,7 @@ WRITE8_HANDLER( snes_w_bank2 )
if (address >= 0x8000)
{
dsp1_write(address, data);
DSP1_setDr(data);
return;
}
@ -603,10 +630,10 @@ WRITE8_HANDLER( snes_w_bank2 )
else if( address >= 0x2000 && address <= 0x5fff ) /* I/O */
snes_w_io( address, data );
else if( address >= 0x6000 && address <= 0x7fff )
{
{
if( snes_cart.mode == SNES_MODE_20 ) /* Reserved */
logerror( "Attempt to write to reserved address: %X\n", offset );
else /* MODE_21 */
else /* MODE_21 */
{
int mask;
@ -629,9 +656,9 @@ WRITE8_HANDLER( snes_w_bank6 )
if (address < 0x8000)
{
dsp1_write(address, data);
DSP1_setDr(data);
return;
}
}
}
/* 0x800000 - 0xffffff */

2454
src/mame/machine/snesdsp1.c
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