AxibugEmuOnline/OtherCore/MyNes.Standard2/MyNes.Core/Mapper067.cs

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C#
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2024-07-24 15:03:33 +08:00
using System.IO;
namespace MyNes.Core
{
[BoardInfo("Sunsoft 3", 67)]
internal class Mapper067 : Board
{
private bool irq_enabled;
private int irq_counter;
private bool odd;
internal override void HardReset()
{
base.HardReset();
Switch16KPRG(PRG_ROM_16KB_Mask, PRGArea.AreaC000);
irq_enabled = false;
irq_counter = 65535;
odd = false;
}
internal override void WritePRG(ref ushort address, ref byte data)
{
switch (address & 0xF800)
{
case 34816:
Switch02KCHR(data, CHRArea.Area0000);
break;
case 38912:
Switch02KCHR(data, CHRArea.Area0800);
break;
case 43008:
Switch02KCHR(data, CHRArea.Area1000);
break;
case 47104:
Switch02KCHR(data, CHRArea.Area1800);
break;
case 51200:
if (!odd)
{
irq_counter = (irq_counter & 0xFF) | (data << 8);
}
else
{
irq_counter = (irq_counter & 0xFF00) | data;
}
odd = !odd;
break;
case 55296:
irq_enabled = (data & 0x10) == 16;
odd = false;
NesEmu.IRQFlags &= -9;
break;
case 59392:
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 63488:
Switch16KPRG(data, PRGArea.Area8000);
break;
}
}
internal override void OnCPUClock()
{
if (irq_enabled)
{
irq_counter--;
if (irq_counter == 0)
{
irq_counter = 65535;
NesEmu.IRQFlags |= 8;
irq_enabled = false;
}
}
}
internal override void WriteStateData(ref BinaryWriter stream)
{
base.WriteStateData(ref stream);
stream.Write(irq_enabled);
stream.Write(irq_counter);
stream.Write(odd);
}
internal override void ReadStateData(ref BinaryReader stream)
{
base.ReadStateData(ref stream);
irq_enabled = stream.ReadBoolean();
irq_counter = stream.ReadInt32();
odd = stream.ReadBoolean();
}
}
}