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Fix Mapper 253

This commit is contained in:
alyosha-tas 2016-09-17 11:05:23 -04:00 committed by GitHub
parent e4caa13b9c
commit 9fcde29f12
1 changed files with 177 additions and 128 deletions
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305
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper253.cs
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@ -1,128 +1,177 @@
using BizHawk.Common;
namespace BizHawk.Emulation.Cores.Nintendo.NES
{
public class Mapper253 : NES.NESBoardBase
{
private ByteBuffer prg = new ByteBuffer(2);
private ByteBuffer chrlo = new ByteBuffer(8);
private ByteBuffer chrhi = new ByteBuffer(8);
private bool vlock;
private int prg_bank_mask_8k, chr_bank_mask_1k;
public override bool Configure(NES.EDetectionOrigin origin)
{
//analyze board type
switch (Cart.board_type)
{
case "MAPPER253":
break;
default:
return false;
}
prg_bank_mask_8k = Cart.prg_size / 8 - 1;
chr_bank_mask_1k = Cart.chr_size - 1;
return true;
}
public override void SyncState(Serializer ser)
{
base.SyncState(ser);
ser.Sync("preg", ref prg);
ser.Sync("chrlo", ref chrlo);
ser.Sync("chrhi", ref chrhi);
}
public override void WritePRG(int addr, byte value)
{
addr += 0x8000;
if ((addr >= 0xB000) && (addr <= 0xE00C))
{
var ind = ((((addr & 8) | (addr >> 8)) >> 3) + 2) & 7;
var sar = addr & 4;
var clo = (chrlo[ind] & (0xF0 >> sar)) | ((value & 0x0F) << sar);
chrlo[ind] = (byte)clo;
if (ind == 0)
{
if (clo == 0xc8)
vlock = false;
else if (clo == 0x88)
vlock = true;
}
if (sar > 0)
chrhi[ind] = (byte)(value >> 4);
}
else
{
switch (addr)
{
case 0x8010: prg[0] = value; break;
case 0xA010: prg[1] = value; break;
case 0x9400: SetMirroring(value); break;
// TODO: IRQ
case 0xF000: break;
case 0xF004: break;
case 0xF008: break;
}
}
}
private void SetMirroring(int mirr)
{
switch(mirr & 3)
{
case 0: SetMirrorType(EMirrorType.Vertical); break;
case 1: SetMirrorType(EMirrorType.Horizontal); break;
case 2: SetMirrorType(EMirrorType.OneScreenA); break;
case 3: SetMirrorType(EMirrorType.Vertical); break;
}
}
public override byte ReadWRAM(int addr)
{
return ROM[addr];
}
public override byte ReadPRG(int addr)
{
int bank;
if (addr < 0x2000)
{
bank = prg[0];
}
else if (addr < 0x4000)
{
bank = prg[1];
}
else if (addr < 0x6000)
{
bank = prg_bank_mask_8k - 1;
}
else
{
bank = prg_bank_mask_8k;
}
return ROM[(bank << 13) + (addr & 0x1FFF)];
}
public override byte ReadPPU(int addr)
{
if (addr < 0x2000)
{
int x = (addr >> 10) & 7;
var chr = chrlo[x] | (chrhi[x] << 8);
int bank = (chr & chr_bank_mask_1k) << 10;
return VROM[bank + (addr & 0x3FF)];
}
return base.ReadPPU(addr);
}
}
}
using BizHawk.Common;
using BizHawk.Common.NumberExtensions;
namespace BizHawk.Emulation.Cores.Nintendo.NES
{
public class Mapper253 : NES.NESBoardBase
{
private ByteBuffer prg = new ByteBuffer(2);
private ByteBuffer chrlo = new ByteBuffer(8);
private ByteBuffer chrhi = new ByteBuffer(8);
private bool vlock;
private int IRQLatch, IRQClock, IRQCount;
private bool IRQa;
private int prg_bank_mask_8k, chr_bank_mask_1k;
public override bool Configure(NES.EDetectionOrigin origin)
{
//analyze board type
switch (Cart.board_type)
{
case "MAPPER253":
break;
default:
return false;
}
prg_bank_mask_8k = Cart.prg_size / 8 - 1;
chr_bank_mask_1k = Cart.chr_size - 1;
return true;
}
public override void SyncState(Serializer ser)
{
base.SyncState(ser);
ser.Sync("preg", ref prg);
ser.Sync("chrlo", ref chrlo);
ser.Sync("chrhi", ref chrhi);
}
public override void ClockCPU()
{
if (IRQa)
{
IRQClock += 3;
if (IRQClock >= 341)
{
IRQClock -= 341;
IRQCount++;
if (IRQCount == 0x100)
{
IRQSignal = true;
IRQCount = IRQLatch;
}
}
}
}
public override void WritePRG(int addr, byte value)
{
addr += 0x8000;
if ((addr >= 0xB000) && (addr <= 0xE00C))
{
var ind = ((((addr & 8) | (addr >> 8)) >> 3) + 2) & 7;
var sar = addr & 4;
var clo = (chrlo[ind] & (0xF0 >> sar)) | ((value & 0x0F) << sar);
chrlo[ind] = (byte)clo;
if (ind == 0)
{
if (clo == 0xc8)
vlock = false;
else if (clo == 0x88)
vlock = true;
}
if (sar > 0)
chrhi[ind] = (byte)(value >> 4);
}
else
{
switch (addr)
{
case 0x8010: prg[0] = value; break;
case 0xA010: prg[1] = value; break;
case 0x9400: SetMirroring(value); break;
case 0xF000: IRQSignal = false; IRQLatch &= 0xF0; IRQLatch |= value & 0xF; break;
case 0xF004: IRQSignal = false; IRQLatch &= 0x0F; IRQLatch |= value << 4; break;
case 0xF008: IRQSignal = false; IRQClock = 0; IRQCount = IRQLatch; IRQa = value.Bit(1); break;
}
}
}
private void SetMirroring(int mirr)
{
switch(mirr & 3)
{
case 0: SetMirrorType(EMirrorType.Vertical); break;
case 1: SetMirrorType(EMirrorType.Horizontal); break;
case 2: SetMirrorType(EMirrorType.OneScreenA); break;
case 3: SetMirrorType(EMirrorType.OneScreenB); break;
}
}
public override byte ReadPRG(int addr)
{
int bank;
if (addr < 0x2000)
{
bank = prg[0] & prg_bank_mask_8k;
}
else if (addr < 0x4000)
{
bank = prg[1] & prg_bank_mask_8k;
}
else if (addr < 0x6000)
{
bank = prg_bank_mask_8k - 1;
}
else
{
bank = prg_bank_mask_8k;
}
return ROM[(bank << 13) + (addr & 0x1FFF)];
}
public override byte ReadPPU(int addr)
{
if (addr < 0x2000)
{
int x = (addr >> 10) & 7;
var chr = chrlo[x] | (chrhi[x] << 8);
int bank = (chr & chr_bank_mask_1k) << 10;
if ((chrlo[x] == 4 || chrlo[x] == 5) && !vlock)
{
bank = chr & 1;
return VRAM[(bank << 10) + (addr & 0x3FF)];
}
else
{
return VROM[bank + (addr & 0x3FF)];
}
}
return base.ReadPPU(addr);
}
public override void WritePPU(int addr, byte value)
{
if (addr < 0x2000)
{
if (VRAM != null)
{
int x = (addr >> 10) & 7;
var chr = chrlo[x] | (chrhi[x] << 8);
int bank = (chr & chr_bank_mask_1k) << 10;
if ((chrlo[x] == 4 || chrlo[x] == 5) && !vlock)
{
bank = chr & 1;
VRAM[(bank << 10) + (addr & 0x3FF)]=value;
}
}
}
else
{
NES.CIRAM[ApplyMirroring(addr)] = value;
}
}
}
}