AxibugEmuOnline/Core/VirtualNes.Core/Mapper/Mapper117.cs

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//////////////////////////////////////////////////////////////////////////
// Mapper117 Sanko Gu(Tw) //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.Core.CPU;
using static VirtualNes.MMU;
using BYTE = System.Byte;
namespace VirtualNes.Core
{
public class Mapper117 : Mapper
{
BYTE irq_enable;
BYTE irq_counter;
public Mapper117(NES parent) : base(parent)
{
}
public override void Reset()
{
SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
if (VROM_1K_SIZE != 0)
{
SetVROM_8K_Bank(0);
}
}
//void Mapper117::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
switch (addr)
{
case 0x8000:
SetPROM_8K_Bank(4, data);
break;
case 0x8001:
SetPROM_8K_Bank(5, data);
break;
case 0x8002:
SetPROM_8K_Bank(6, data);
break;
case 0xA000:
SetVROM_1K_Bank(0, data);
break;
case 0xA001:
SetVROM_1K_Bank(1, data);
break;
case 0xA002:
SetVROM_1K_Bank(2, data);
break;
case 0xA003:
SetVROM_1K_Bank(3, data);
break;
case 0xA004:
SetVROM_1K_Bank(4, data);
break;
case 0xA005:
SetVROM_1K_Bank(5, data);
break;
case 0xA006:
SetVROM_1K_Bank(6, data);
break;
case 0xA007:
SetVROM_1K_Bank(7, data);
break;
case 0xC001:
case 0xC002:
case 0xC003:
irq_counter = data;
break;
case 0xE000:
irq_enable = (byte)(data & 1);
// nes.cpu.ClrIRQ( IRQ_MAPPER );
break;
}
}
//void Mapper117::HSync(INT scanline)
public override void HSync(int scanline)
{
if ((scanline >= 0 && scanline <= 239))
{
if (nes.ppu.IsDispON())
{
if (irq_enable != 0)
{
if (irq_counter == scanline)
{
irq_counter = 0;
// nes.cpu.IRQ();
// nes.cpu.SetIRQ( IRQ_MAPPER );
nes.cpu.SetIRQ(IRQ_TRIGGER);
}
}
}
}
}
//void Mapper117::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
p[0] = irq_counter;
p[1] = irq_enable;
}
//void Mapper117::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
irq_counter = p[0];
irq_enable = p[1];
}
public override bool IsStateSave()
{
return true;
}
}
}