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nes-support vrc1

This commit is contained in:
zeromus 2011-09-25 01:41:54 +00:00
parent fece5fd7e2
commit 9d5c52ee7e
3 changed files with 123 additions and 2 deletions
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2
BizHawk.Emulation/BizHawk.Emulation.csproj
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@ -95,7 +95,6 @@
<Compile Include="Consoles\Nintendo\NES\Boards\GxROM.cs">
<SubType>Code</SubType>
</Compile>
<Compile Include="Consoles\Nintendo\NES\Boards\HVC_CNROM_256K_01.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\HVC_UN1ROM.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\HVC_UNROM_74HC08.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\IC_74x377.cs">
@ -138,6 +137,7 @@
<Compile Include="Consoles\Nintendo\NES\Boards\UxROM.cs">
<SubType>Code</SubType>
</Compile>
<Compile Include="Consoles\Nintendo\NES\Boards\VRC1.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\VRC2_4.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\VRC3.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\VRC6.cs" />

2
BizHawk.Emulation/Consoles/Nintendo/Docs/compatibility.txt
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@ -62,7 +62,7 @@ Open bus and bus conflict emulation is not considered complete or thorough in an
072 Misc (J) Nothing
073 VRC3 Good
074 Pirate (CN) Junk
075 VRC1 Nothing
075 VRC1 Complete
076 Misc (J) Nothing
077 Misc (J) Complete
078 Misc Complete

121
BizHawk.Emulation/Consoles/Nintendo/NES/Boards/VRC1.cs Normal file
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@ -0,0 +1,121 @@
using System;
using System.IO;
using System.Diagnostics;
namespace BizHawk.Emulation.Consoles.Nintendo
{
//AKA mapper 75
public class VRC1 : NES.NESBoardBase
{
//configuration
int prg_bank_mask_8k;
int chr_bank_mask_4k;
//state
IntBuffer prg_banks_8k = new IntBuffer(4);
IntBuffer chr_banks_4k = new IntBuffer(2);
int[] chr_regs_4k = new int[2];
public override void Dispose()
{
base.Dispose();
chr_banks_4k.Dispose();
}
public override void SyncState(Serializer ser)
{
base.SyncState(ser);
ser.Sync("prg_banks_8k", ref prg_banks_8k);
ser.Sync("chr_banks_4k", ref chr_banks_4k);
for (int i = 0; i < 2; i++) ser.Sync("chr_regs_4k_" + i, ref chr_regs_4k[i]);
if (ser.IsReader)
{
SyncCHR();
}
}
public override bool Configure(NES.EDetectionOrigin origin)
{
switch (Cart.board_type)
{
case "KONAMI-VRC-1":
AssertPrg(128); AssertChr(128); AssertVram(0); AssertWram(0);
break;
default:
return false;
}
prg_bank_mask_8k = Cart.prg_size / 8 - 1;
chr_bank_mask_4k = Cart.chr_size / 4 - 1;
SetMirrorType(EMirrorType.Vertical);
prg_banks_8k[3] = (byte)(0xFF & prg_bank_mask_8k);
return true;
}
public override byte ReadPRG(int addr)
{
int bank_8k = addr >> 13;
int ofs = addr & ((1 << 13) - 1);
bank_8k = prg_banks_8k[bank_8k];
addr = (bank_8k << 13) | ofs;
return ROM[addr];
}
public override byte ReadPPU(int addr)
{
if (addr < 0x2000)
{
int bank_4k = addr >> 12;
int ofs = addr & ((1 << 12) - 1);
bank_4k = chr_banks_4k[bank_4k];
bank_4k &= chr_bank_mask_4k;
addr = (bank_4k << 12) | ofs;
return VROM[addr];
}
else return base.ReadPPU(addr);
}
void SyncCHR()
{
chr_banks_4k[0] = chr_regs_4k[0] & chr_bank_mask_4k;
chr_banks_4k[1] = chr_regs_4k[1] & chr_bank_mask_4k;
}
public override void WritePRG(int addr, byte value)
{
switch (addr)
{
case 0x0000: prg_banks_8k[0] = (value & 0xF) & prg_bank_mask_8k; break;
case 0x2000: prg_banks_8k[1] = (value & 0xF) & prg_bank_mask_8k; break;
case 0x4000: prg_banks_8k[2] = (value & 0xF) & prg_bank_mask_8k; break;
case 0x1000: //[.... .BAM] Mirroring, CHR reg high bits
if(value.Bit(0))
SetMirrorType(NES.NESBoardBase.EMirrorType.Horizontal);
else
SetMirrorType(NES.NESBoardBase.EMirrorType.Vertical);
chr_regs_4k[0] &= 0x0F;
chr_regs_4k[1] &= 0x0F;
if (value.Bit(1)) chr_regs_4k[0] |= 0x10;
if (value.Bit(2)) chr_regs_4k[1] |= 0x10;
SyncCHR();
break;
case 0x6000:
chr_regs_4k[0] = (chr_regs_4k[0] & 0xF0) | (value & 0x0F);
SyncCHR();
break;
case 0x7000:
chr_regs_4k[1] = (chr_regs_4k[1] & 0xF0) | (value & 0x0F);
SyncCHR();
break;
}
}
}
}