forked from sin365/AxibugEmuOnline
178 lines
4.9 KiB
C#
178 lines
4.9 KiB
C#
//////////////////////////////////////////////////////////////////////////
|
|
// Mapper024 Konami VRC6 (Normal) //
|
|
//////////////////////////////////////////////////////////////////////////
|
|
using System;
|
|
using static VirtualNes.Core.CPU;
|
|
using static VirtualNes.MMU;
|
|
using BYTE = System.Byte;
|
|
using INT = System.Int32;
|
|
|
|
|
|
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;
|
|
BitConverter.GetBytes(irq_clock).CopyTo(p, 3);
|
|
}
|
|
|
|
//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];
|
|
irq_clock = BitConverter.ToInt32(p, 3);
|
|
}
|
|
|
|
|
|
public override bool IsStateSave()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
}
|
|
}
|