AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper245.cs
2024-08-05 17:46:33 +08:00

256 lines
7.8 KiB
C#

//////////////////////////////////////////////////////////////
// Mapper245 Yong Zhe Dou E Long //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.Core.CPU;
using static VirtualNes.MMU;
using BYTE = System.Byte;
using INT = System.Int32;
namespace VirtualNes.Core
{
public class Mapper245 : Mapper
{
BYTE[] reg = new byte[8];
BYTE prg0, prg1;
BYTE chr01, chr23, chr4, chr5, chr6, chr7;
BYTE we_sram;
BYTE irq_type;
BYTE irq_enable;
BYTE irq_counter;
BYTE irq_latch;
BYTE irq_request;
int MMC4prg, MMC4chr;
public Mapper245(NES parent) : base(parent)
{
}
//void Mapper245::Reset()
public override void Reset()
{
for (INT i = 0; i < 8; i++)
{
reg[i] = 0x00;
}
prg0 = 0;
prg1 = 1;
SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
if (VROM_1K_SIZE != 0)
{
SetVROM_8K_Bank(0);
}
we_sram = 0; // Disable
irq_enable = 0; // Disable
irq_counter = 0;
irq_latch = 0;
irq_request = 0;
nes.SetIrqType(NES.IRQMETHOD.IRQ_CLOCK);
}
//void Mapper245::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
switch (addr & 0xF7FF)
{
case 0x8000:
reg[0] = data;
break;
case 0x8001:
reg[1] = data;
switch (reg[0])
{
case 0x00:
reg[3] = (byte)((data & 2) << 5);
SetPROM_8K_Bank(6, 0x3E | reg[3]);
SetPROM_8K_Bank(7, 0x3F | reg[3]);
break;
case 0x06:
prg0 = data;
break;
case 0x07:
prg1 = data;
break;
}
SetPROM_8K_Bank(4, prg0 | reg[3]);
SetPROM_8K_Bank(5, prg1 | reg[3]);
break;
case 0xA000:
reg[2] = data;
if (!nes.rom.Is4SCREEN())
{
if ((data & 0x01) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
else SetVRAM_Mirror(VRAM_VMIRROR);
}
break;
case 0xA001:
break;
case 0xC000:
reg[4] = data;
irq_counter = data;
irq_request = 0;
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0xC001:
reg[5] = data;
irq_latch = data;
irq_request = 0;
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0xE000:
reg[6] = data;
irq_enable = 0;
irq_request = 0;
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0xE001:
reg[7] = data;
irq_enable = 1;
irq_request = 0;
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
}
}
//void Mapper245::Clock(INT cycles)
public override void Clock(int cycles)
{
// if( irq_request && (nes.GetIrqType() == NES::IRQ_CLOCK) ) {
// nes.cpu.IRQ_NotPending();
// }
}
//void Mapper245::HSync(INT scanline)
public override void HSync(int scanline)
{
if ((scanline >= 0 && scanline <= 239))
{
if (nes.ppu.IsDispON())
{
if (irq_enable != 0 && irq_request == 0)
{
if (scanline == 0)
{
if (irq_counter != 0)
{
irq_counter--;
}
}
if ((irq_counter--) == 0)
{
irq_request = 0xFF;
irq_counter = irq_latch;
nes.cpu.SetIRQ(IRQ_MAPPER);
}
}
}
}
// if( irq_request && (nes.GetIrqType() == NES::IRQ_HSYNC) ) {
// nes.cpu.IRQ_NotPending();
// }
}
void SetBank_CPU()
{
SetPROM_32K_Bank(prg0, prg1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
}
void SetBank_PPU()
{
if ((VROM_1K_SIZE) != 0)
{
if (((reg[0] & 0x80)! + 0) != 0)
{
SetVROM_8K_Bank(chr4, chr5, chr6, chr7,
chr23 + 1, chr23, chr01 + 1, chr01);
}
else
{
SetVROM_8K_Bank(chr01, chr01 + 1, chr23, chr23 + 1,
chr4, chr5, chr6, chr7);
}
}
else
{
if ((reg[0] & 0x80) != 0)
{
SetCRAM_1K_Bank(4, (chr01 + 0) & 0x07);
SetCRAM_1K_Bank(5, (chr01 + 1) & 0x07);
SetCRAM_1K_Bank(6, (chr23 + 0) & 0x07);
SetCRAM_1K_Bank(7, (chr23 + 1) & 0x07);
SetCRAM_1K_Bank(0, chr4 & 0x07);
SetCRAM_1K_Bank(1, chr5 & 0x07);
SetCRAM_1K_Bank(2, chr6 & 0x07);
SetCRAM_1K_Bank(3, chr7 & 0x07);
}
else
{
SetCRAM_1K_Bank(0, (chr01 + 0) & 0x07);
SetCRAM_1K_Bank(1, (chr01 + 1) & 0x07);
SetCRAM_1K_Bank(2, (chr23 + 0) & 0x07);
SetCRAM_1K_Bank(3, (chr23 + 1) & 0x07);
SetCRAM_1K_Bank(4, chr4 & 0x07);
SetCRAM_1K_Bank(5, chr5 & 0x07);
SetCRAM_1K_Bank(6, chr6 & 0x07);
SetCRAM_1K_Bank(7, chr7 & 0x07);
}
}
}
public override bool IsStateSave()
{
return true;
}
//void Mapper245::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
//for (INT i = 0; i < 8; i++)
//{
// p[i] = reg[i];
//}
//p[8] = prg0;
//p[9] = prg1;
//p[10] = chr01;
//p[11] = chr23;
//p[12] = chr4;
//p[13] = chr5;
//p[14] = chr6;
//p[15] = chr7;
//p[16] = irq_enable;
//p[17] = (BYTE)irq_counter;
//p[18] = irq_latch;
//p[19] = irq_request;
}
//void Mapper245::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
//for (INT i = 0; i < 8; i++)
//{
// reg[i] = p[i];
//}
//prg0 = p[8];
//prg1 = p[9];
//chr01 = p[10];
//chr23 = p[11];
//chr4 = p[12];
//chr5 = p[13];
//chr6 = p[14];
//chr7 = p[15];
//irq_enable = p[16];
//irq_counter = (INT)p[17];
//irq_latch = p[18];
//irq_request = p[19];
}
}
}