AxibugEmuOnline/OtherCore/MyNes.Standard2/MyNes.Core/Bandai.cs

142 lines
3.1 KiB
C#

using System.IO;
namespace MyNes.Core
{
internal abstract class Bandai : Board
{
private bool irq_enable;
private int irq_counter;
private Eprom eprom;
internal override void Initialize(IRom rom)
{
base.Initialize(rom);
if (base.BoardType.ToLower().Contains("24c01"))
{
eprom = new Eprom(128);
}
else
{
eprom = new Eprom((base.MapperNumber == 16) ? 256 : 128);
}
}
internal override void HardReset()
{
base.HardReset();
Switch16KPRG(PRG_ROM_16KB_Mask, PRGArea.AreaC000);
irq_enable = false;
irq_counter = 0;
eprom.HardReset();
}
internal override void WriteSRM(ref ushort address, ref byte data)
{
WritePRG(ref address, ref data);
}
internal override void WritePRG(ref ushort address, ref byte data)
{
switch (address & 0xF)
{
case 0:
Switch01KCHR(data, CHRArea.Area0000);
break;
case 1:
Switch01KCHR(data, CHRArea.Area0400);
break;
case 2:
Switch01KCHR(data, CHRArea.Area0800);
break;
case 3:
Switch01KCHR(data, CHRArea.Area0C00);
break;
case 4:
Switch01KCHR(data, CHRArea.Area1000);
break;
case 5:
Switch01KCHR(data, CHRArea.Area1400);
break;
case 6:
Switch01KCHR(data, CHRArea.Area1800);
break;
case 7:
Switch01KCHR(data, CHRArea.Area1C00);
break;
case 8:
Switch16KPRG(data, PRGArea.Area8000);
break;
case 9:
switch (data & 3)
{
case 0:
Switch01KNMTFromMirroring(Mirroring.Vert);
break;
case 1:
Switch01KNMTFromMirroring(Mirroring.Horz);
break;
case 2:
Switch01KNMTFromMirroring(Mirroring.OneScA);
break;
case 3:
Switch01KNMTFromMirroring(Mirroring.OneScB);
break;
}
break;
case 10:
irq_enable = (data & 1) == 1;
NesEmu.IRQFlags &= -9;
break;
case 11:
irq_counter = (irq_counter & 0xFF00) | data;
break;
case 12:
irq_counter = (irq_counter & 0xFF) | (data << 8);
break;
case 13:
eprom.Write(address, data);
break;
}
}
internal override void ReadSRM(ref ushort address, out byte value)
{
value = eprom.Read(address);
}
internal override void OnCPUClock()
{
if (irq_enable)
{
irq_counter--;
if (irq_counter == 0)
{
NesEmu.IRQFlags |= 8;
}
if (irq_counter < 0)
{
irq_counter = 65535;
}
}
}
internal override void WriteStateData(ref BinaryWriter stream)
{
base.WriteStateData(ref stream);
stream.Write(irq_enable);
stream.Write(irq_counter);
eprom.SaveState(stream);
}
internal override void ReadStateData(ref BinaryReader stream)
{
base.ReadStateData(ref stream);
irq_enable = stream.ReadBoolean();
irq_counter = stream.ReadInt32();
eprom.LoadState(stream);
}
}
}