AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper024.cs
2024-08-05 01:33:07 +08:00

175 lines
3.3 KiB
C#

//////////////////////////////////////////////////////////////////////////
// Mapper024 Konami VRC6 (Normal) //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.MMU;
using static VirtualNes.Core.CPU;
using INT = System.Int32;
using BYTE = System.Byte;
using Codice.CM.Client.Differences;
namespace VirtualNes.Core
{
public class Mapper024 : Mapper
{
BYTE irq_enable;
BYTE irq_counter;
BYTE irq_latch;
INT irq_clock;
public Mapper024(NES parent) : base(parent)
{
}
public override void Reset()
{
irq_enable = 0;
irq_counter = 0;
irq_latch = 0;
irq_clock = 0;
SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
if (VROM_1K_SIZE != 0)
{
SetVROM_8K_Bank(0);
}
nes.SetRenderMethod(EnumRenderMethod.POST_RENDER);
// nes.SetRenderMethod( NES::PRE_RENDER );
nes.apu.SelectExSound(1);
}
//void Mapper024::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
switch (addr & 0xF003)
{
case 0x8000:
SetPROM_16K_Bank(4, data);
break;
case 0x9000:
case 0x9001:
case 0x9002:
case 0xA000:
case 0xA001:
case 0xA002:
case 0xB000:
case 0xB001:
case 0xB002:
nes.apu.ExWrite(addr, data);
break;
case 0xB003:
data = (byte)(data & 0x0C);
if (data == 0x00) SetVRAM_Mirror(VRAM_VMIRROR);
else if (data == 0x04) SetVRAM_Mirror(VRAM_HMIRROR);
else if (data == 0x08) SetVRAM_Mirror(VRAM_MIRROR4L);
else if (data == 0x0C) SetVRAM_Mirror(VRAM_MIRROR4H);
break;
case 0xC000:
SetPROM_8K_Bank(6, data);
break;
case 0xD000:
SetVROM_1K_Bank(0, data);
break;
case 0xD001:
SetVROM_1K_Bank(1, data);
break;
case 0xD002:
SetVROM_1K_Bank(2, data);
break;
case 0xD003:
SetVROM_1K_Bank(3, data);
break;
case 0xE000:
SetVROM_1K_Bank(4, data);
break;
case 0xE001:
SetVROM_1K_Bank(5, data);
break;
case 0xE002:
SetVROM_1K_Bank(6, data);
break;
case 0xE003:
SetVROM_1K_Bank(7, data);
break;
case 0xF000:
irq_latch = data;
break;
case 0xF001:
irq_enable = (byte)(data & 0x03);
if ((irq_enable & 0x02) != 0)
{
irq_counter = irq_latch;
irq_clock = 0;
}
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0xF002:
irq_enable = (byte)((irq_enable & 0x01) * 3);
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
}
}
//void Mapper024::Clock(INT cycles)
public override void Clock(int cycles)
{
if ((irq_enable & 0x02) != 0)
{
if ((irq_clock += cycles) >= 0x72)
{
irq_clock -= 0x72;
if (irq_counter == 0xFF)
{
irq_counter = irq_latch;
// nes.cpu.IRQ_NotPending();
nes.cpu.SetIRQ(IRQ_MAPPER);
}
else
{
irq_counter++;
}
}
}
}
//void Mapper024::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
//p[0] = irq_enable;
//p[1] = irq_counter;
//p[2] = irq_latch;
//*(INT*)&p[3] = irq_clock;
}
//void Mapper024::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
//irq_enable = p[0];
//irq_counter = p[1];
//irq_latch = p[2];
//irq_clock = *(INT*)&p[3];
}
public override bool IsStateSave()
{
return true;
}
}
}