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Fix mapper 183 

Notes: This game sounds different in Nestopia and punes, are we missing a sound component?
This commit is contained in:
alyosha-tas 2016-09-18 13:53:17 -04:00 committed by GitHub
parent 7263041f3a
commit cf8201dbe3
1 changed files with 67 additions and 12 deletions
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79
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper183.cs
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@ -1,5 +1,7 @@
using BizHawk.Common;
using BizHawk.Common.NumberExtensions;
using System;
namespace BizHawk.Emulation.Cores.Nintendo.NES
{
// Adpated from FCEUX src
@ -8,7 +10,13 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
private ByteBuffer prg = new ByteBuffer(4);
private ByteBuffer chr = new ByteBuffer(8);
private int prg_bank_mask_8k, chr_bank_mask_1k;
private int IRQLatch = 0;
private int IRQCount = 0;
private bool IRQMode;
private bool IRQa = false;
private bool IRQr = false;
private int prg_bank_mask_8k, chr_bank_mask_1k, IRQPre=341;
public override bool Configure(NES.EDetectionOrigin origin)
{
@ -40,10 +48,43 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
case 0: SetMirrorType(EMirrorType.Vertical); break;
case 1: SetMirrorType(EMirrorType.Horizontal); break;
case 2: SetMirrorType(EMirrorType.OneScreenA); break;
case 3: SetMirrorType(EMirrorType.Vertical); break;
case 3: SetMirrorType(EMirrorType.OneScreenB); break;
}
}
public override void ClockCPU()
{
if (IRQa)
{
if (IRQMode)
{
IRQCount++;
if (IRQCount == 0xFF)
{
IRQSignal = true;
IRQCount = IRQLatch;
}
}
else
{
IRQPre -= 3;
if (IRQPre <= 0)
{
IRQPre += 341;
IRQCount++;
if (IRQCount >= 0x100)
{
IRQSignal = IRQa;
IRQCount = IRQLatch;
}
}
}
}
}
public override void WriteWRAM(int addr, byte value)
{
WriteReg(addr + 0x6000, value);
@ -70,13 +111,27 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
case 0x8800: prg[0] = value; break;
case 0xA800: prg[1] = value; break;
case 0xA000: prg[2] = value; break;
case 0x9800: SetMirroring(value & 3); break;
// TODO: IRQ
case 0xF000: break;
case 0xF004: break;
case 0xF008: break;
case 0xF00C: break;
case 0x9800: SetMirroring(value & 3); break;
// TODO: IRQ
case 0xF000: IRQLatch = ((IRQLatch & 0xF0) | (value & 0xF)); break;
case 0xF004: IRQLatch = ((IRQLatch & 0x0F) | ((value & 0xF) << 4)); break;
case 0xF008:
IRQMode = value.Bit(2);
IRQa = value.Bit(1);//value>0 ? true:false;
IRQr = value.Bit(0);
if (IRQa)
{
IRQPre = 341;
IRQCount = IRQLatch;
}
IRQSignal = false;
break;
case 0xF00C:
IRQSignal = false;
IRQa = IRQr;
break;
}
}
@ -93,8 +148,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
}
public override byte ReadWRAM(int addr)
{
return ROM[((prg[3] & prg_bank_mask_8k)) << 13 + (addr & 0x1FFF)];
{
return ROM[(((prg[3] & prg_bank_mask_8k)) << 13) + (addr & 0x1FFF)];
}
public override byte ReadPRG(int addr)