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NES - implement mapper 45

This commit is contained in:
adelikat 2012-07-28 01:29:06 +00:00
parent 524bc29b43
commit 10c71da526
4 changed files with 146 additions and 3 deletions
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1
BizHawk.Emulation/BizHawk.Emulation.csproj
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@ -149,6 +149,7 @@
<Compile Include="Consoles\Nintendo\NES\Boards\JALECO_JF_17.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\JALECO_JF_19.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper015.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper045.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper057.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper058.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper069.cs" />

2
BizHawk.Emulation/Consoles/Nintendo/NES/Boards/MMC3_family/MMC3.cs
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@ -321,7 +321,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
return mmc3.Get_PRGBank_8K(addr);
}
int MapCHR(int addr)
protected virtual int MapCHR(int addr)
{
int bank_1k = Get_CHRBank_1K(addr);
bank_1k &= chr_mask;

4
BizHawk.Emulation/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper205.cs
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@ -68,7 +68,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
return ROM[addr];
}
int MapCHR(int addr)
int MapCHR2(int addr)
{
int bank_1k = Get_CHRBank_1K(addr);
bank_1k &= chr_mask;
@ -99,7 +99,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
{
if (addr < 0x2000)
{
addr = MapCHR(addr);
addr = MapCHR2(addr);
if (VROM != null)
return VROM[addr + extra_vrom];
else return VRAM[addr];

142
BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper045.cs Normal file
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@ -0,0 +1,142 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace BizHawk.Emulation.Consoles.Nintendo
{
class Mapper045 : MMC3Board_Base
{
//http://wiki.nesdev.com/w/index.php/INES_Mapper_045
int chr_bank_mask_2k;
int prg_bank_mask_8k;
int cur_reg = 0;
ByteBuffer regs = new ByteBuffer(4);
bool lock_regs = false;
public override bool Configure(NES.EDetectionOrigin origin)
{
switch (Cart.board_type)
{
case "MAPPER045":
break;
default:
return false;
}
chr_bank_mask_2k = Cart.chr_size / 2 - 1;
prg_bank_mask_8k = Cart.prg_size / 8 - 1;
BaseSetup();
return true;
}
public override void Dispose()
{
regs.Dispose();
base.Dispose();
}
public override void SyncState(Serializer ser)
{
ser.Sync("regs", ref regs);
base.SyncState(ser);
}
public override void WriteWRAM(int addr, byte value)
{
if (lock_regs)
{
base.WriteWRAM(addr, value);
}
else
{
regs[cur_reg] = value;
IncrementCounter();
Sync45();
}
}
private void Sync45()
{
lock_regs = regs[3].Bit(6);
}
private void IncrementCounter()
{
if (cur_reg == 3)
{
cur_reg = 0;
}
else
{
cur_reg++;
}
}
public override void NESSoftReset()
{
lock_regs = false;
cur_reg = 0;
regs = new ByteBuffer(4);
base.NESSoftReset();
}
public override byte ReadPRG(int addr)
{
int bank_8k = Get_PRGBank_8K(addr);
bank_8k &= (regs[3] & 0x3F) ^ 0x3F;
bank_8k |= regs[1];
bank_8k &= prg_mask;
addr = (bank_8k << 13) | (addr & 0x1FFF);
return ROM[addr];
}
private int CHR_AND()
{
switch (regs[2] & 0x0F)
{
default:
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
return 0x00;
case 8:
return 0x01;
case 9:
case 0xA:
case 0xB:
case 0xC:
case 0xD:
return 0x3F;
case 0xE:
return 0x7F;
case 0xF:
return 0xFF;
}
}
private int CHR_OR()
{
int x = regs[0] | ((regs[2] >> 4) << 8);
return x;
}
protected override int MapCHR(int addr)
{
int bank_1k = Get_CHRBank_1K(addr);
bank_1k &= CHR_AND();
bank_1k |= CHR_OR();
bank_1k &= chr_mask;
addr = (bank_1k << 10) | (addr & 0x3FF);
return addr;
}
}
}