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NES - progress on mappers 90 & 209

This commit is contained in:
adelikat 2012-08-01 02:55:01 +00:00
parent eeb0171eda
commit accd643fde
1 changed files with 146 additions and 11 deletions
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157
BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper090.cs
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@ -18,7 +18,8 @@ namespace BizHawk.Emulation.Consoles.Nintendo
int chr_bank_mask_4k;
int chr_bank_mask_8k;
int prg_mode_select = 0;
byte prg_mode_select = 0;
byte chr_mode_select = 0;
bool sram_prg = false;
public override bool Configure(NES.EDetectionOrigin origin)
@ -48,8 +49,10 @@ namespace BizHawk.Emulation.Consoles.Nintendo
public override void SyncState(Serializer ser)
{
ser.Sync("prg_regs_8k", ref prg_banks);
ser.Sync("prg_banks", ref prg_banks);
ser.Sync("chr_banks", ref chr_banks);
ser.Sync("prg_mode_select", ref prg_mode_select);
ser.Sync("chr_mode_select", ref prg_mode_select);
ser.Sync("sram_prg", ref sram_prg);
base.SyncState(ser);
}
@ -76,24 +79,58 @@ namespace BizHawk.Emulation.Consoles.Nintendo
break;
case 0x1000:
chr_banks[0] |= value;
break;
case 0x1001:
chr_banks[1] |= value;
break;
case 0x1002:
chr_banks[2] |= value;
break;
case 0x1003:
chr_banks[3] |= value;
break;
case 0x1004:
chr_banks[4] |= value;
break;
case 0x1005:
chr_banks[5] |= value;
break;
case 0x1006:
chr_banks[6] |= value;
break;
case 0x1007:
chr_banks[7] |= value;
break;
case 0x2000:
chr_banks[0] |= (value << 8);
break;
case 0x2001:
chr_banks[1] |= (value << 8);
break;
case 0x2002:
chr_banks[2] |= (value << 8);
break;
case 0x2003:
chr_banks[3] |= (value << 8);
break;
case 0x2004:
chr_banks[4] |= (value << 8);
break;
case 0x2005:
chr_banks[5] |= (value << 8);
break;
case 0x2006:
chr_banks[6] |= (value << 8);
break;
case 0x2007:
chr_banks[7] |= (value << 8);
break;
case 0x5000:
prg_mode_select = (byte)(value & 0x07);
chr_mode_select = (byte)((value >> 3) & 0x03);
sram_prg = value.Bit(7);
break;
case 0x5001: //TODO: mapper 90 flag
@ -116,6 +153,20 @@ namespace BizHawk.Emulation.Consoles.Nintendo
}
}
private byte BitRev7(byte value) //adelikat: Bit reverses a 7 bit register, ugly but gets the job done
{
byte newvalue = 0;
newvalue |= (byte)((value & 0x01) << 6);
newvalue |= (byte)(((value >> 1) & 0x01) << 5);
newvalue |= (byte)(((value >> 2) & 0x01) << 4);
newvalue |= (byte)(value & 0x08);
newvalue |= (byte)(((value >> 4) & 0x01 ) << 2);
newvalue |= (byte)(((value >> 5) & 0x01) << 1);
newvalue |= (byte)((value >> 6) & 0x01);
return newvalue;
}
public override byte ReadPRG(int addr)
{
int bank = 0;
@ -139,15 +190,15 @@ namespace BizHawk.Emulation.Consoles.Nintendo
case 3:
if (addr < 0x2000)
{
bank = prg_banks[0] & prg_bank_mask_8k;
bank = BitRev7(prg_banks[0]) & prg_bank_mask_8k;
}
else if (addr < 0x4000)
{
bank = prg_banks[1] & prg_bank_mask_8k;
bank = BitRev7(prg_banks[1]) & prg_bank_mask_8k;
}
else if (addr < 0x6000)
{
bank = prg_banks[2] & prg_bank_mask_8k;
bank = BitRev7(prg_banks[2]) & prg_bank_mask_8k;
}
else
{
@ -172,19 +223,19 @@ namespace BizHawk.Emulation.Consoles.Nintendo
case 7:
if (addr < 0x2000)
{
bank = prg_banks[0] & prg_bank_mask_8k;
bank = BitRev7(prg_banks[0]) & prg_bank_mask_8k;
}
else if (addr < 0x4000)
{
bank = prg_banks[1] & prg_bank_mask_8k;
bank = BitRev7(prg_banks[1]) & prg_bank_mask_8k;
}
else if (addr < 0x6000)
{
bank = prg_banks[2] & prg_bank_mask_8k;
bank = BitRev7(prg_banks[2]) & prg_bank_mask_8k;
}
else
{
bank = prg_banks[3] & prg_bank_mask_8k;
bank = BitRev7(prg_banks[3]) & prg_bank_mask_8k;
}
return ROM[(bank * 0x2000) + (addr & 0x1FFF)];
}
@ -210,11 +261,14 @@ namespace BizHawk.Emulation.Consoles.Nintendo
bank = (prg_banks[3] << 1) + 3;
break;
case 2:
case 3:
case 6:
case 7:
bank = prg_banks[3];
break;
case 3:
case 7:
bank = BitRev7(prg_banks[3]);
break;
}
return ROM[(bank * 0x2000) + (addr + 0x1FFF)];
}
@ -223,5 +277,86 @@ namespace BizHawk.Emulation.Consoles.Nintendo
return base.ReadWRAM(addr);
}
}
public override byte ReadPPU(int addr)
{
if (addr < 0x2000)
{
int bank = 0;
switch (chr_mode_select)
{
default:
case 0:
bank = chr_banks[0] & chr_bank_mask_8k;
return VROM[(bank * 0x2000) + (addr & 0x1FFF)];
case 1:
if (addr < 0x1000)
{
bank = chr_banks[0] & chr_bank_mask_4k;
}
else
{
bank = chr_banks[4] & chr_bank_mask_4k;
}
return VROM[(bank * 0x1000) + (addr & 0x0FFF)];
case 2:
if (addr < 0x800)
{
bank = chr_banks[0] & chr_bank_mask_2k;
}
else if (addr < 0x1000)
{
bank = chr_banks[2] & chr_bank_mask_2k;
}
else if (addr < 0x1800)
{
bank = chr_banks[4] & chr_bank_mask_2k;
}
else
{
bank = chr_banks[6] & chr_bank_mask_2k;
}
return VROM[(bank * 0x0800) + (addr & 0x07FF)];
case 3:
if (addr < 0x0400)
{
bank = chr_banks[0] & chr_bank_mask_1k;
}
else if (addr < 0x0800)
{
bank = chr_banks[1] & chr_bank_mask_1k;
}
else if (addr < 0x0C00)
{
bank = chr_banks[2] & chr_bank_mask_1k;
}
else if (addr < 0x1000)
{
bank = chr_banks[3] & chr_bank_mask_1k;
}
else if (addr < 0x1400)
{
bank = chr_banks[4] & chr_bank_mask_1k;
}
else if (addr < 0x1800)
{
bank = chr_banks[5] & chr_bank_mask_1k;
}
else if (addr < 0x1C00)
{
bank = chr_banks[6] & chr_bank_mask_1k;
}
else
{
bank = chr_banks[7] & chr_bank_mask_1k;
}
return VROM[(bank * 0x0400) + (addr & 0x03FF)];
}
}
else
{
return base.ReadPPU(addr);
}
}
}
}