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BizHawk
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Implement mapper 243

This commit is contained in:
adelikat 2012-07-21 19:23:05 +00:00
parent f16a44d4e6
commit b8a16f93fa
1 changed files with 30 additions and 34 deletions
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42
BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper243.cs
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@ -56,6 +56,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
int reg_addr;
ByteBuffer regs = new ByteBuffer(8);
int chr_bank_mask_8k, prg_bank_mask_32k;
public override bool Configure(NES.EDetectionOrigin origin)
{
@ -66,7 +67,8 @@ namespace BizHawk.Emulation.Consoles.Nintendo
default:
return false;
}
chr_bank_mask_8k = Cart.chr_size / 8 - 1;
prg_bank_mask_32k = Cart.prg_size / 32 - 1;
return true;
}
@ -79,35 +81,27 @@ namespace BizHawk.Emulation.Consoles.Nintendo
public override void WriteEXP(int addr, byte value)
{
switch (addr & 0x101)
switch (addr & 0x01)
{
case 0x0000:
reg_addr = addr & 0x07;
reg_addr = value & 0x07;
break;
case 0x0001:
switch (reg_addr)
{
case 0:
regs[0] = 0; regs[1] = 3; //FCEUX does this
break;
case 2:
regs[3] = (byte)((value & 0x01) << 3);
break;
case 4:
regs[1] = (byte)((regs[1] & 0x06) | (value & 0x03));
break;
case 5:
regs[0] = (byte)(value & 0x01);
break;
case 6:
regs[1] = (byte)((regs[1] & 0x01) | (regs[3] | (value & 0x03) << 1));
break;
case 7:
regs[2] = (byte)(value & 0x01);
break;
}
case 4:
regs[4] = (byte)(value & 0x01);
break;
case 5:
regs[5] = (byte)(value & 0x07);
break;
case 6:
regs[6] = (byte)(value & 0x03);
break;
case 7:
int mirror = (value >> 1) & 0x03;
switch (mirror)
{
@ -126,6 +120,8 @@ namespace BizHawk.Emulation.Consoles.Nintendo
}
break;
}
break;
}
}
public override byte ReadPPU(int addr)
@ -133,7 +129,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
if (addr < 0x2000)
{
int chr_bank = regs[4] | (regs[6] << 1) | (regs[2] << 3);
return VROM[(chr_bank * 0x2000) + addr];
return VROM[((chr_bank & chr_bank_mask_8k) * 0x2000) + addr];
}
else
{
@ -143,7 +139,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
public override byte ReadPRG(int addr)
{
return ROM[(regs[5] * 0x8000) + addr];
return ROM[((regs[5] & prg_bank_mask_32k) * 0x8000) + addr];
}
}
}