AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper195.cs

325 lines
6.2 KiB
C#

using static VirtualNes.MMU;
using static VirtualNes.Core.CPU;
using INT = System.Int32;
using BYTE = System.Byte;
using System;
using Codice.CM.Client.Differences;
namespace VirtualNes.Core
{
public class Mapper195 : 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;
public Mapper195(NES parent) : base(parent)
{
}
public override void Reset()
{
for (INT i = 0; i < 8; i++)
{
reg[i] = 0x00;
}
prg0 = 0;
prg1 = 1;
SetBank_CPU();
chr01 = 0;
chr23 = 2;
chr4 = 4;
chr5 = 5;
chr6 = 6;
chr7 = 7;
SetBank_PPU();
we_sram = 0; // Disable
irq_enable = 0; // Disable
irq_counter = 0;
irq_latch = 0;
irq_request = 0;
}
//BYTE Mapper195::ReadLow(WORD addr)
public override byte ReadLow(ushort addr)
{
if (addr >= 0x5000 && addr <= 0x5FFF)
{
return XRAM[addr - 0x4000];
}
else
{
return base.ReadLow(addr);
}
}
//void Mapper195::WriteLow(WORD addr, BYTE data)
public override void WriteLow(ushort addr, byte data)
{
if (addr >= 0x5000 && addr <= 0x5FFF)
{
XRAM[addr - 0x4000] = data;
}
else
{
base.WriteLow(addr, data);
}
}
//void Mapper195::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
//DEBUGOUT( "MPRWR A=%04X D=%02X L=%3d CYC=%d\n", addr&0xFFFF, data&0xFF, nes.GetScanline(), nes.cpu.GetTotalCycles() );
switch (addr & 0xE001)
{
case 0x8000:
reg[0] = data;
SetBank_CPU();
SetBank_PPU();
break;
case 0x8001:
reg[1] = data;
switch (reg[0] & 0x07)
{
case 0x00:
chr01 = data;
SetBank_PPU();
break;
case 0x01:
chr23 = data;
SetBank_PPU();
break;
case 0x02:
chr4 = data;
SetBank_PPU();
break;
case 0x03:
chr5 = data;
SetBank_PPU();
break;
case 0x04:
chr6 = data;
SetBank_PPU();
break;
case 0x05:
chr7 = data;
SetBank_PPU();
break;
case 0x06:
prg0 = data;
SetBank_CPU();
break;
case 0x07:
prg1 = data;
SetBank_CPU();
break;
}
break;
case 0xA000:
reg[2] = data;
if (!nes.rom.Is4SCREEN())
{
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 0xA001:
reg[3] = data;
break;
case 0xC000:
reg[4] = data;
irq_counter = data;
irq_request = 0;
break;
case 0xC001:
reg[5] = data;
irq_latch = data;
irq_request = 0;
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;
break;
}
}
//void Mapper195::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);
}
}
}
}
}
void SetBank_CPU()
{
if ((reg[0] & 0x40) != 0)
{
SetPROM_32K_Bank(PROM_8K_SIZE - 2, prg1, prg0, PROM_8K_SIZE - 1);
}
else
{
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)
{
// SetVROM_8K_Bank( chr4, chr5, chr6, chr7,
// chr01, chr01+1, chr23, chr23+1 );
SetBank_PPUSUB(4, chr01 + 0);
SetBank_PPUSUB(5, chr01 + 1);
SetBank_PPUSUB(6, chr23 + 0);
SetBank_PPUSUB(7, chr23 + 1);
SetBank_PPUSUB(0, chr4);
SetBank_PPUSUB(1, chr5);
SetBank_PPUSUB(2, chr6);
SetBank_PPUSUB(3, chr7);
}
else
{
// SetVROM_8K_Bank( chr01, chr01+1, chr23, chr23+1,
// chr4, chr5, chr6, chr7 );
SetBank_PPUSUB(0, chr01 + 0);
SetBank_PPUSUB(1, chr01 + 1);
SetBank_PPUSUB(2, chr23 + 0);
SetBank_PPUSUB(3, chr23 + 1);
SetBank_PPUSUB(4, chr4);
SetBank_PPUSUB(5, chr5);
SetBank_PPUSUB(6, chr6);
SetBank_PPUSUB(7, chr7);
}
}
else
{
if ((reg[0] & 0x80) != 0)
{
SetCRAM_1K_Bank(4, (chr01 + 0));
SetCRAM_1K_Bank(5, (chr01 + 1));
SetCRAM_1K_Bank(6, (chr23 + 0));
SetCRAM_1K_Bank(7, (chr23 + 1));
SetCRAM_1K_Bank(0, chr4);
SetCRAM_1K_Bank(1, chr5);
SetCRAM_1K_Bank(2, chr6);
SetCRAM_1K_Bank(3, chr7);
}
else
{
SetCRAM_1K_Bank(0, (chr01 + 0));
SetCRAM_1K_Bank(1, (chr01 + 1));
SetCRAM_1K_Bank(2, (chr23 + 0));
SetCRAM_1K_Bank(3, (chr23 + 1));
SetCRAM_1K_Bank(4, chr4);
SetCRAM_1K_Bank(5, chr5);
SetCRAM_1K_Bank(6, chr6);
SetCRAM_1K_Bank(7, chr7);
}
}
}
void SetBank_PPUSUB(int bank, int page)
{
if (page <= 3)
{
SetCRAM_1K_Bank((byte)bank, page);
}
else
{
SetVROM_1K_Bank((byte)bank, page);
}
}
//void Mapper195::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
for (byte 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] = irq_counter;
p[18] = irq_latch;
p[19] = irq_request;
}
//void Mapper195::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
for (byte 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 = p[17];
irq_latch = p[18];
irq_request = p[19];
}
public override bool IsStateSave()
{
return true;
}
}
}