AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper035.cs

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2024-08-05 10:28:41 +08:00
//////////////////////////////////////////////////////////////////////////
// Mapper035 //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.MMU;
using static VirtualNes.Core.CPU;
using INT = System.Int32;
using BYTE = System.Byte;
using Codice.CM.Client.Differences;
namespace VirtualNes.Core
{
public class Mapper035 : Mapper
{
BYTE[] reg = new byte[8];
BYTE[] chr = new byte[8];
ushort IRQCount, IRQa;
public Mapper035(NES parent) : base(parent)
{
}
public override void Reset()
{
for (int i = 0; i < 8; i++)
reg[i] = chr[i] = 0;
IRQCount = IRQa = 0;
//SetPROM_32K_Bank( 0, 1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
Sync();
//setprg8r(0x10,0x6000,0);
SetPROM_8K_Bank(7, PROM_8K_SIZE - 1);
}
void Sync()
{
int i;
SetPROM_8K_Bank(4, reg[0]);
SetPROM_8K_Bank(5, reg[1]);
SetPROM_8K_Bank(6, reg[2]);
for (i = 0; i < 8; i++)
SetVROM_1K_Bank((byte)i, chr[i]);
SetVRAM_Mirror(reg[3] ^ 1);
}
//void Mapper035::WriteLow(WORD addr, BYTE data)
public override void WriteLow(ushort addr, byte data)
{
if (addr >= 0x6000 && addr <= 0x7FFF)
{
XRAM[addr - 0x6000] = data;
}
else
{
base.WriteLow(addr, data);
}
}
//BYTE Mapper035::ReadLow(WORD addr)
public override byte ReadLow(ushort addr)
{
if (addr >= 0x6000 && addr <= 0x7FFF)
{
return XRAM[addr - 0x6000];
}
else
{
return base.ReadLow(addr);
}
}
//void Mapper035::Write(WORD A, BYTE V)
public override void Write(ushort A, byte V)
{
switch (A)
{
case 0x8000: reg[0] = V; break;
case 0x8001: reg[1] = V; break;
case 0x8002: reg[2] = V; break;
case 0x9000: chr[0] = V; break;
case 0x9001: chr[1] = V; break;
case 0x9002: chr[2] = V; break;
case 0x9003: chr[3] = V; break;
case 0x9004: chr[4] = V; break;
case 0x9005: chr[5] = V; break;
case 0x9006: chr[6] = V; break;
case 0x9007: chr[7] = V; break;
case 0xC002:
IRQa = 0;
nes.cpu.ClrIRQ(IRQ_MAPPER); break;
case 0xC005: IRQCount = V; break;
case 0xC003: IRQa = 1; break;
case 0xD001: reg[3] = V; break;
}
Sync();
}
//void Mapper035::HSync(INT scanline)
public override void HSync(int scanline)
{
if ((scanline >= 0 && scanline <= 239))
{
if (nes.ppu.IsDispON())
{
if (IRQa!=0)
{
IRQCount--;
if (IRQCount == 0)
{
nes.cpu.SetIRQ(IRQ_MAPPER);
IRQa = 0;
}
}
}
}
}
public override bool IsStateSave()
{
return true;
}
}
}