AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper040.cs
2024-08-05 01:33:07 +08:00

91 lines
1.7 KiB
C#

//////////////////////////////////////////////////////////////////////////
// Mapper040 SMB2J //
//////////////////////////////////////////////////////////////////////////
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 Mapper040 : Mapper
{
BYTE irq_enable;
INT irq_line;
public Mapper040(NES parent) : base(parent)
{
}
public override void Reset()
{
irq_enable = 0;
irq_line = 0;
SetPROM_8K_Bank(3, 6);
SetPROM_32K_Bank(4, 5, 0, 7);
if (VROM_1K_SIZE != 0)
{
SetVROM_8K_Bank(0);
}
}
//void Mapper040::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
switch (addr & 0xE000)
{
case 0x8000:
irq_enable = 0;
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0xA000:
irq_enable = 0xFF;
irq_line = 37;
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0xC000:
break;
case 0xE000:
SetPROM_8K_Bank(6, data & 0x07);
break;
}
}
//void Mapper040::HSync(INT scanline)
public override void HSync(int scanline)
{
if (irq_enable != 0)
{
if (--irq_line <= 0)
{
// nes.cpu.IRQ();
nes.cpu.SetIRQ(IRQ_MAPPER);
}
}
}
//void Mapper040::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
//p[0] = irq_enable;
//*(INT*)&p[1] = irq_line;
}
//void Mapper040::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
//irq_enable = p[0];
//irq_line = *(INT*)&p[1];
}
public override bool IsStateSave()
{
return true;
}
}
}