140 lines
3.9 KiB
C#
140 lines
3.9 KiB
C#
//////////////////////////////////////////////////////////////////////////
|
|
// Mapper067 SunSoft Mapper 3 //
|
|
//////////////////////////////////////////////////////////////////////////
|
|
using static VirtualNes.Core.CPU;
|
|
using static VirtualNes.MMU;
|
|
using BYTE = System.Byte;
|
|
using INT = System.Int32;
|
|
|
|
|
|
namespace VirtualNes.Core
|
|
{
|
|
public class Mapper067 : Mapper
|
|
{
|
|
BYTE irq_enable;
|
|
BYTE irq_occur;
|
|
BYTE irq_toggle;
|
|
INT irq_counter;
|
|
public Mapper067(NES parent) : base(parent)
|
|
{
|
|
}
|
|
|
|
public override void Reset()
|
|
|
|
{
|
|
irq_enable = 0;
|
|
irq_toggle = 0;
|
|
irq_counter = 0;
|
|
irq_occur = 0;
|
|
|
|
SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
|
|
|
|
SetVROM_4K_Bank(0, 0);
|
|
SetVROM_4K_Bank(4, VROM_4K_SIZE - 1);
|
|
|
|
uint crc = nes.rom.GetPROM_CRC();
|
|
|
|
if (crc == 0x7f2a04bf)
|
|
{ // For Fantasy Zone 2(J)
|
|
nes.SetRenderMethod(EnumRenderMethod.PRE_ALL_RENDER);
|
|
}
|
|
}
|
|
|
|
//void Mapper067::Write(WORD addr, BYTE data)
|
|
public override void Write(ushort addr, byte data)
|
|
{
|
|
switch (addr & 0xF800)
|
|
{
|
|
case 0x8800:
|
|
SetVROM_2K_Bank(0, data);
|
|
break;
|
|
case 0x9800:
|
|
SetVROM_2K_Bank(2, data);
|
|
break;
|
|
case 0xA800:
|
|
SetVROM_2K_Bank(4, data);
|
|
break;
|
|
case 0xB800:
|
|
SetVROM_2K_Bank(6, data);
|
|
break;
|
|
|
|
case 0xC800:
|
|
if (irq_toggle == 0)
|
|
{
|
|
irq_counter = (irq_counter & 0x00FF) | ((INT)data << 8);
|
|
}
|
|
else
|
|
{
|
|
irq_counter = (irq_counter & 0xFF00) | ((INT)data & 0xFF);
|
|
}
|
|
irq_toggle ^= 1;
|
|
irq_occur = 0;
|
|
nes.cpu.ClrIRQ(IRQ_MAPPER);
|
|
break;
|
|
case 0xD800:
|
|
irq_enable = (byte)(data & 0x10);
|
|
irq_toggle = 0;
|
|
irq_occur = 0;
|
|
nes.cpu.ClrIRQ(IRQ_MAPPER);
|
|
break;
|
|
|
|
case 0xE800:
|
|
data &= 0x03;
|
|
if (data == 0) SetVRAM_Mirror(VRAM_VMIRROR);
|
|
else if (data == 1) SetVRAM_Mirror(VRAM_HMIRROR);
|
|
else if (data == 2) SetVRAM_Mirror(VRAM_MIRROR4L);
|
|
else SetVRAM_Mirror(VRAM_MIRROR4H);
|
|
break;
|
|
|
|
case 0xF800:
|
|
SetPROM_16K_Bank(4, data);
|
|
break;
|
|
}
|
|
}
|
|
|
|
//void Mapper067::Clock(INT cycles)
|
|
public override void Clock(int cycles)
|
|
{
|
|
if (irq_enable != 0)
|
|
{
|
|
if ((irq_counter -= cycles) <= 0)
|
|
{
|
|
irq_enable = 0;
|
|
irq_occur = 0xFF;
|
|
irq_counter = 0xFFFF;
|
|
nes.cpu.SetIRQ(IRQ_MAPPER);
|
|
}
|
|
}
|
|
|
|
// if( irq_occur ) {
|
|
// nes.cpu.IRQ_NotPending();
|
|
// }
|
|
}
|
|
|
|
//void Mapper067::SaveState(LPBYTE p)
|
|
public override void SaveState(byte[] p)
|
|
{
|
|
//p[0] = irq_enable;
|
|
//p[1] = irq_occur;
|
|
//p[2] = irq_toggle;
|
|
//*((INT*)&p[3]) = irq_counter;
|
|
}
|
|
|
|
//void Mapper067::LoadState(LPBYTE p)
|
|
public override void LoadState(byte[] p)
|
|
{
|
|
//irq_enable = p[0];
|
|
//irq_occur = p[1];
|
|
//irq_toggle = p[2];
|
|
//irq_counter = *((INT*)&p[3]);
|
|
}
|
|
|
|
|
|
public override bool IsStateSave()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
}
|
|
}
|