AxibugEmuOnline/Core/VirtualNes.Core/Mapper/Mapper091.cs

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//////////////////////////////////////////////////////////////////////////
// Mapper091 PC-HK-SF3 //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.Core.CPU;
using static VirtualNes.MMU;
using BYTE = System.Byte;
namespace VirtualNes.Core
{
public class Mapper091 : Mapper
{
BYTE irq_enable;
BYTE irq_counter;
public Mapper091(NES parent) : base(parent)
{
}
public override void Reset()
{
SetPROM_32K_Bank(PROM_8K_SIZE - 2, PROM_8K_SIZE - 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
if (VROM_8K_SIZE != 0)
{
SetVROM_8K_Bank(0, 0, 0, 0, 0, 0, 0, 0);
}
irq_enable = 0;
irq_counter = 0;
nes.SetRenderMethod(EnumRenderMethod.POST_ALL_RENDER);
}
//void Mapper091::WriteLow(WORD addr, BYTE data)
public override void WriteLow(ushort addr, byte data)
{
//DEBUGOUT( "$%04X:$%02X(%3d) L=%3d\n", addr, data, data, nes.GetScanline() );
switch (addr & 0xF003)
{
case 0x6000:
case 0x6001:
case 0x6002:
case 0x6003:
SetVROM_2K_Bank((byte)((addr & 0x03) * 2), data);
break;
case 0x7000:
SetPROM_8K_Bank(4, data);
break;
case 0x7001:
SetPROM_8K_Bank(5, data);
break;
case 0x7002:
irq_enable = 0;
irq_counter = 0;
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0x7003:
irq_enable = 1;
break;
}
}
//void Mapper091::HSync(INT scanline)
public override void HSync(int scanline)
{
if ((scanline >= 0 && scanline < 240) && nes.ppu.IsDispON())
{
if (irq_enable != 0)
{
irq_counter++;
}
if (irq_counter >= 8)
{
// nes.cpu.IRQ_NotPending();
nes.cpu.SetIRQ(IRQ_MAPPER);
}
}
}
//void Mapper091::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
p[0] = irq_enable;
p[1] = irq_counter;
}
//void Mapper091::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
irq_enable = p[0];
irq_counter = p[1];
}
public override bool IsStateSave()
{
return true;
}
}
}