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NESHawk - finishing up mapper 6

This commit is contained in:
adelikat 2015-08-23 01:05:30 -04:00
parent 0e94191b97
commit 988168b0bc
1 changed files with 52 additions and 22 deletions
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74
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/FFE/Mapper006.cs
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@ -5,10 +5,11 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
public class Mapper006 : NES.NESBoardBase
{
private int _reg;
private int _mirr;
private int IRQa, mirr;
private int IRQCount, IRQLatch;
private bool _irqEnable;
private bool _irqPending;
private int _irqCount;
private const int IRQDESTINATION = 0x10000;
private int _prgMask16k;
@ -24,7 +25,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
}
SetMirrorType(Cart.pad_h, Cart.pad_v);
_prgMask16k = Cart.prg_size / 16 - 1;
return true;
@ -34,6 +34,10 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
{
base.SyncState(ser);
ser.Sync("reg", ref _reg);
ser.Sync("irqEnable", ref _irqEnable);
ser.Sync("irqPending", ref _irqPending);
ser.Sync("irqCount", ref _irqCount);
}
public override void WriteEXP(int addr, byte value)
@ -41,8 +45,22 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
// Mirroring
if (addr == 0x2FE || addr == 0x2FF)
{
_mirr = ((addr << 1) & 2) | ((addr >> 4) & 1);
Sync();
int mirr = ((addr << 1) & 2) | ((value >> 4) & 1);
switch (mirr)
{
case 0:
SetMirrorType(EMirrorType.OneScreenA);
break;
case 1:
SetMirrorType(EMirrorType.OneScreenB);
break;
case 2:
SetMirrorType(EMirrorType.Vertical);
break;
case 3:
SetMirrorType(EMirrorType.Horizontal);
break;
}
}
// IRQ
@ -51,21 +69,27 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
switch (addr)
{
case 0x501:
int zzz = 0;
_irqEnable = false;
break;
case 0x502:
_irqCount &= 0xFF00;
_irqCount |= value;
break;
case 0x503:
_irqCount &= 0x00FF;
_irqCount |= value << 8;
_irqEnable = true;
break;
}
SyncIRQ();
}
}
public override void WritePRG(int addr, byte value)
{
_reg = value;
Sync();
}
public override byte ReadPRG(int addr)
@ -100,23 +124,29 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
}
}
private void Sync()
public override void ClockCPU()
{
switch (_mirr)
if (_irqEnable)
{
case 0:
SetMirrorType(EMirrorType.OneScreenA);
break;
case 1:
SetMirrorType(EMirrorType.OneScreenB);
break;
case 2:
SetMirrorType(EMirrorType.Vertical);
break;
case 3:
SetMirrorType(EMirrorType.Vertical);
break;
ClockIRQ();
}
}
private void ClockIRQ()
{
_irqCount++;
if (_irqCount >= IRQDESTINATION)
{
_irqEnable = false;
_irqPending = true;
}
SyncIRQ();
}
private void SyncIRQ()
{
SyncIRQ(_irqPending);
}
}
}