AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper050.cs

99 lines
2.6 KiB
C#

//////////////////////////////////////////////////////////////////////////
// Mapper050 SMB2J //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.Core.CPU;
using static VirtualNes.MMU;
using BYTE = System.Byte;
namespace VirtualNes.Core
{
public class Mapper050 : Mapper
{
BYTE irq_enable;
public Mapper050(NES parent) : base(parent)
{
}
public override void Reset()
{
irq_enable = 0;
SetPROM_8K_Bank(3, 15);
SetPROM_8K_Bank(4, 8);
SetPROM_8K_Bank(5, 9);
SetPROM_8K_Bank(6, 0);
SetPROM_8K_Bank(7, 11);
if (VROM_1K_SIZE != 0)
{
SetVROM_8K_Bank(0);
}
}
//void Mapper050::ExWrite(WORD addr, BYTE data)
public override void ExWrite(ushort addr, byte data)
{
if ((addr & 0xE060) == 0x4020)
{
if ((addr & 0x0100) != 0)
{
irq_enable = (byte)(data & 0x01);
nes.cpu.ClrIRQ(IRQ_MAPPER);
}
else
{
SetPROM_8K_Bank(6, (data & 0x08) | ((data & 0x01) << 2) | ((data & 0x06) >> 1));
}
}
}
//void Mapper050::WriteLow(WORD addr, BYTE data)
public override void WriteLow(ushort addr, byte data)
{
if ((addr & 0xE060) == 0x4020)
{
if ((addr & 0x0100) != 0)
{
irq_enable = (byte)(data & 0x01);
nes.cpu.ClrIRQ(IRQ_MAPPER);
}
else
{
SetPROM_8K_Bank(6, (data & 0x08) | ((data & 0x01) << 2) | ((data & 0x06) >> 1));
}
}
}
//void Mapper050::HSync(INT scanline)
public override void HSync(int scanline)
{
if (irq_enable != 0)
{
if (scanline == 21)
{
// nes.cpu.IRQ();
nes.cpu.SetIRQ(IRQ_MAPPER);
}
}
}
//void Mapper050::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
p[0] = irq_enable;
}
//void Mapper050::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
irq_enable = p[0];
}
public override bool IsStateSave()
{
return true;
}
}
}