增加 Mapper253支持 参照VirtuaNESex C++代码翻译

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sin365 2025-01-13 21:46:13 +08:00
parent 8494f67229
commit aebdf6824b
2 changed files with 248 additions and 0 deletions

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//////////////////////////////////////////////////////////////////////////
// Mapper253 WaiXing LongZhu CN //
//////////////////////////////////////////////////////////////////////////
using System;
using static VirtualNes.Core.CPU;
using static VirtualNes.MMU;
using BYTE = System.Byte;
using INT = System.Int32;
namespace VirtualNes.Core
{
public class Mapper253 : Mapper
{
BYTE VRAM_switch;
BYTE rom_type;
BYTE[] reg = new BYTE[9];
BYTE irq_enable;
BYTE irq_counter;
BYTE irq_latch;
INT irq_clock;
public Mapper253(NES parent) : base(parent)
{
}
public override bool IsStateSave()
{
return true;
}
//void Mapper253::Reset()
public override void Reset()
{
// nes.ppu.SetVromWrite(1);
for (INT i = 0; i < 8; i++)
{
reg[i] = (byte)i;
}
reg[8] = 0;
irq_enable = 0;
irq_counter = 0;
irq_latch = 0;
irq_clock = 0;
VRAM_switch = 0;
rom_type = 0;
SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
SetVROM_8K_Bank(0);
uint crc = nes.rom.GetPROM_CRC();
if (crc == 0x0530b26e)
{ //[HengGe] Shen Hua Jian Yun III (C)
rom_type = 1;
}
}
//void Mapper253::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
Debug.Debuger.Log($"Address={addr & 0xFFFF} Data={data & 0xFF}");
if (addr == 0x8010)
{
SetPROM_8K_Bank(4, data);
return;
}
if (addr == 0xA010)
{
SetPROM_8K_Bank(5, data);
return;
}
if (addr == 0x9400)
{
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);
}
switch (addr & 0xF00C)
{
case 0xB000:
reg[0] = (byte)((reg[0] & 0xF0) | (data & 0x0F));
SetBank_PPUSUB(0, reg[0]);
break;
case 0xB004:
reg[0] = (byte)((reg[0] & 0x0F) | ((data & 0x0F) << 4));
SetBank_PPUSUB(0, reg[0] + ((data >> 4) * 0x100));
break;
case 0xB008:
reg[1] = (byte)((reg[1] & 0xF0) | (data & 0x0F));
SetBank_PPUSUB(1, reg[1]);
break;
case 0xB00C:
reg[1] = (byte)((reg[1] & 0x0F) | ((data & 0x0F) << 4));
SetBank_PPUSUB(1, reg[1] + ((data >> 4) * 0x100));
break;
case 0xC000:
reg[2] = (byte)((reg[2] & 0xF0) | (data & 0x0F));
SetBank_PPUSUB(2, reg[2]);
break;
case 0xC004:
reg[2] = (byte)((reg[2] & 0x0F) | ((data & 0x0F) << 4));
SetBank_PPUSUB(2, reg[2] + ((data >> 4) * 0x100));
break;
case 0xC008:
reg[3] = (byte)((reg[3] & 0xF0) | (data & 0x0F));
SetBank_PPUSUB(3, reg[3]);
break;
case 0xC00C:
reg[3] = (byte)((reg[3] & 0x0F) | ((data & 0x0F) << 4));
SetBank_PPUSUB(3, reg[3] + ((data >> 4) * 0x100));
break;
case 0xD000:
reg[4] = (byte)((reg[4] & 0xF0) | (data & 0x0F));
SetBank_PPUSUB(4, reg[4]);
break;
case 0xD004:
reg[4] = (byte)((reg[4] & 0x0F) | ((data & 0x0F) << 4));
SetBank_PPUSUB(4, reg[4] + ((data >> 4) * 0x100));
break;
case 0xD008:
reg[5] = (byte)((reg[5] & 0xF0) | (data & 0x0F));
SetBank_PPUSUB(5, reg[5]);
break;
case 0xD00C:
reg[5] = (byte)((reg[5] & 0x0F) | ((data & 0x0F) << 4));
SetBank_PPUSUB(5, reg[5] + ((data >> 4) * 0x100));
break;
case 0xE000:
reg[6] = (byte)((reg[6] & 0xF0) | (data & 0x0F));
SetBank_PPUSUB(6, reg[6]);
break;
case 0xE004:
reg[6] = (byte)((reg[6] & 0x0F) | ((data & 0x0F) << 4));
SetBank_PPUSUB(6, reg[6] + ((data >> 4) * 0x100));
break;
case 0xE008:
reg[7] = (byte)((reg[7] & 0xF0) | (data & 0x0F));
SetBank_PPUSUB(7, reg[7]);
break;
case 0xE00C:
reg[7] = (byte)((reg[7] & 0x0F) | ((data & 0x0F) << 4));
SetBank_PPUSUB(7, reg[7] + ((data >> 4) * 0x100));
break;
case 0xF000:
irq_latch = (byte)((irq_latch & 0xF0) | (data & 0x0F));
break;
case 0xF004:
irq_latch = (byte)((irq_latch & 0x0F) | ((data & 0x0F) << 4));
break;
case 0xF008:
irq_enable = (byte)(data & 0x03);
if ((irq_enable & 0x02) != null)
{
irq_counter = irq_latch;
irq_clock = 0;
}
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
}
}
//void Mapper253::SetBank_PPUSUB(int bank, int page)
private void SetBank_PPUSUB(int bank, int page)
{
if (rom_type == 1)
{
if (page == 0x88)
{
VRAM_switch = 0;
return;
}
else if (page == 0xc8)
{
VRAM_switch = 1;
return;
}
}
if ((page == 4) || (page == 5))
{
if ((VRAM_switch == 0) && (rom_type == 1))
{
SetVROM_1K_Bank((byte)bank, page);
}
else
{
SetCRAM_1K_Bank((byte)bank, page);
}
}
else
{
SetVROM_1K_Bank((byte)bank, page);
}
}
//void Mapper253::Clock(INT cycles)
public override void Clock(int cycles)
{
if ((irq_enable & 0x02)!= null)
{
if ((irq_clock += cycles) >= 0x72)
{
irq_clock -= 0x72;
if (irq_counter == 0xFF)
{
irq_counter = irq_latch;
irq_enable = (BYTE)((irq_enable & 0x01) * 3);
nes.cpu.SetIRQ(IRQ_MAPPER);
}
else
{
irq_counter++;
}
}
}
}
//void Mapper253::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
for (INT i = 0; i < 9; i++)
{
p[i] = reg[i];
}
p[9] = irq_enable;
p[10] = irq_counter;
p[11] = irq_latch;
//*(INT*)&p[12] = irq_clock;
p[12] = (byte)irq_clock;
}
//void Mapper253::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
for (INT i = 0; i < 9; i++)
{
reg[i] = p[i];
}
irq_enable = p[9];
irq_counter = p[10];
irq_latch = p[11];
//irq_clock = *(INT*)&p[12];
irq_clock = p[12];
}
}
}

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