AxibugEmuOnline/Core/VirtualNes.Core/Mapper/Mapper025.cs

282 lines
9.0 KiB
C#
Raw Normal View History

//////////////////////////////////////////////////////////////////////////
// Mapper025 Konami VRC4 (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 Mapper025 : Mapper
{
BYTE[] reg = new byte[11];
BYTE irq_enable;
BYTE irq_latch;
BYTE irq_occur;
BYTE irq_counter;
INT irq_clock;
public Mapper025(NES parent) : base(parent)
{
}
public override void Reset()
{
for (INT i = 0; i < 11; i++)
{
reg[i] = 0;
}
reg[9] = (byte)(PROM_8K_SIZE - 2);
irq_enable = 0;
irq_counter = 0;
irq_latch = 0;
irq_occur = 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);
}
uint crc = nes.rom.GetPROM_CRC();
if (crc == 0xc71d4ce7)
{ // Gradius II(J)
// nes.SetRenderMethod( NES::POST_RENDER );
}
if (crc == 0xa2e68da8)
{ // For Racer Mini Yonku - Japan Cup(J)
nes.SetRenderMethod(EnumRenderMethod.TILE_RENDER);
}
if (crc == 0xea74c587)
{ // For Teenage Mutant Ninja Turtles(J)
nes.SetRenderMethod(EnumRenderMethod.TILE_RENDER);
}
if (crc == 0x5f82cb7d)
{ // For Teenage Mutant Ninja Turtles 2(J)
}
if (crc == 0x0bbd85ff)
{ // For Bio Miracle Bokutte Upa(J)
nes.SetRenderMethod(EnumRenderMethod.PRE_ALL_RENDER);
}
}
//void Mapper025::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
//if( addr >= 0xF000 )
//DEBUGOUT( "M25 WR $%04X=$%02X L=%3d\n", addr, data, nes.GetScanline() );
switch (addr & 0xF000)
{
case 0x8000:
if ((reg[10] & 0x02) != 0)
{
reg[9] = data;
SetPROM_8K_Bank(6, data);
}
else
{
reg[8] = data;
SetPROM_8K_Bank(4, data);
}
break;
case 0xA000:
SetPROM_8K_Bank(5, data);
break;
}
switch (addr & 0xF00F)
{
case 0x9000:
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 0x9001:
case 0x9004:
if ((reg[10] & 0x02) != (data & 0x02))
{
BYTE swap = reg[8];
reg[8] = reg[9];
reg[9] = swap;
SetPROM_8K_Bank(4, reg[8]);
SetPROM_8K_Bank(6, reg[9]);
}
reg[10] = data;
break;
case 0xB000:
reg[0] = (byte)((reg[0] & 0xF0) | (data & 0x0F));
SetVROM_1K_Bank(0, reg[0]);
break;
case 0xB002:
case 0xB008:
reg[0] = (byte)((reg[0] & 0x0F) | ((data & 0x0F) << 4));
SetVROM_1K_Bank(0, reg[0]);
break;
case 0xB001:
case 0xB004:
reg[1] = (byte)((reg[1] & 0xF0) | (data & 0x0F));
SetVROM_1K_Bank(1, reg[1]);
break;
case 0xB003:
case 0xB00C:
reg[1] = (byte)((reg[1] & 0x0F) | ((data & 0x0F) << 4));
SetVROM_1K_Bank(1, reg[1]);
break;
case 0xC000:
reg[2] = (byte)((reg[2] & 0xF0) | (data & 0x0F));
SetVROM_1K_Bank(2, reg[2]);
break;
case 0xC002:
case 0xC008:
reg[2] = (byte)((reg[2] & 0x0F) | ((data & 0x0F) << 4));
SetVROM_1K_Bank(2, reg[2]);
break;
case 0xC001:
case 0xC004:
reg[3] = (byte)((reg[3] & 0xF0) | (data & 0x0F));
SetVROM_1K_Bank(3, reg[3]);
break;
case 0xC003:
case 0xC00C:
reg[3] = (byte)((reg[3] & 0x0F) | ((data & 0x0F) << 4));
SetVROM_1K_Bank(3, reg[3]);
break;
case 0xD000:
reg[4] = (byte)((reg[4] & 0xF0) | (data & 0x0F));
SetVROM_1K_Bank(4, reg[4]);
break;
case 0xD002:
case 0xD008:
reg[4] = (byte)((reg[4] & 0x0F) | ((data & 0x0F) << 4));
SetVROM_1K_Bank(4, reg[4]);
break;
case 0xD001:
case 0xD004:
reg[5] = (byte)((reg[5] & 0xF0) | (data & 0x0F));
SetVROM_1K_Bank(5, reg[5]);
break;
case 0xD003:
case 0xD00C:
reg[5] = (byte)((reg[5] & 0x0F) | ((data & 0x0F) << 4));
SetVROM_1K_Bank(5, reg[5]);
break;
case 0xE000:
reg[6] = (byte)((reg[6] & 0xF0) | (data & 0x0F));
SetVROM_1K_Bank(6, reg[6]);
break;
case 0xE002:
case 0xE008:
reg[6] = (byte)((reg[6] & 0x0F) | ((data & 0x0F) << 4));
SetVROM_1K_Bank(6, reg[6]);
break;
case 0xE001:
case 0xE004:
reg[7] = (byte)((reg[7] & 0xF0) | (data & 0x0F));
SetVROM_1K_Bank(7, reg[7]);
break;
case 0xE003:
case 0xE00C:
reg[7] = (byte)((reg[7] & 0x0F) | ((data & 0x0F) << 4));
SetVROM_1K_Bank(7, reg[7]);
break;
case 0xF000:
irq_latch = (byte)((irq_latch & 0xF0) | (data & 0x0F));
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0xF002:
case 0xF008:
irq_latch = (byte)((irq_latch & 0x0F) | ((data & 0x0F) << 4));
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0xF001:
case 0xF004:
irq_enable = (byte)(data & 0x03);
// irq_counter = 0x100 - irq_latch;
irq_counter = irq_latch;
irq_clock = 0;
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0xF003:
case 0xF00C:
irq_enable = (byte)((irq_enable & 0x01) * 3);
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
}
}
//void Mapper025::Clock(INT cycles)
public override void Clock(int cycles)
{
if ((irq_enable & 0x02) != 0)
{
irq_clock += cycles * 3;
while (irq_clock >= 341)
{
irq_clock -= 341;
irq_counter++;
if (irq_counter == 0)
{
irq_counter = irq_latch;
nes.cpu.SetIRQ(IRQ_MAPPER);
}
}
}
}
//void Mapper025::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
for (INT i = 0; i < 11; i++)
{
p[i] = reg[i];
}
p[11] = irq_enable;
p[12] = irq_occur;
p[13] = irq_latch;
p[14] = irq_counter;
//*((INT*)&p[15]) = irq_clock;
BitConverter.GetBytes(irq_clock).CopyTo(p, 15);
}
//void Mapper025::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
for (INT i = 0; i < 11; i++)
{
reg[i] = p[i];
}
irq_enable = p[11];
irq_occur = p[12];
irq_latch = p[13];
irq_counter = p[14];
//irq_clock = *((INT*)&p[15]);
irq_clock = BitConverter.ToInt32(p, 15);
}
}
}