AxibugEmuOnline/OtherCore/MyNes.Standard2/MyNes.Core/Mapper091.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("HK-SF3", 91, true, true)]
internal class Mapper091 : Board
{
private bool irq_enabled;
private byte irq_counter;
private int old_irq_counter;
private byte irq_reload;
private bool irq_clear;
internal override void HardReset()
{
base.HardReset();
Switch16KPRG(PRG_ROM_16KB_Mask, PRGArea.AreaC000);
}
internal override void WriteSRM(ref ushort address, ref byte data)
{
switch (address & 0x7003)
{
case 24576:
Switch02KCHR(data, CHRArea.Area0000);
break;
case 24577:
Switch02KCHR(data, CHRArea.Area0800);
break;
case 24578:
Switch02KCHR(data, CHRArea.Area1000);
break;
case 24579:
Switch02KCHR(data, CHRArea.Area1800);
break;
case 28672:
Switch08KPRG(data & 0xF, PRGArea.Area8000);
break;
case 28673:
Switch08KPRG(data & 0xF, PRGArea.AreaA000);
break;
case 28674:
irq_enabled = false;
NesEmu.IRQFlags &= -9;
break;
case 28675:
irq_enabled = true;
irq_reload = 7;
irq_counter = 0;
break;
}
}
internal override void OnPPUA12RaisingEdge()
{
old_irq_counter = irq_counter;
if (irq_counter == 0 || irq_clear)
{
irq_counter = irq_reload;
}
else
{
irq_counter--;
}
if ((old_irq_counter != 0 || irq_clear) && irq_counter == 0 && irq_enabled)
{
NesEmu.IRQFlags |= 8;
}
irq_clear = false;
}
internal override void WriteStateData(ref BinaryWriter stream)
{
base.WriteStateData(ref stream);
stream.Write(irq_enabled);
stream.Write(irq_counter);
stream.Write(old_irq_counter);
stream.Write(irq_reload);
stream.Write(irq_clear);
}
internal override void ReadStateData(ref BinaryReader stream)
{
base.ReadStateData(ref stream);
irq_enabled = stream.ReadBoolean();
irq_counter = stream.ReadByte();
old_irq_counter = stream.ReadInt32();
irq_reload = stream.ReadByte();
irq_clear = stream.ReadBoolean();
}
}
}