97 lines
2.3 KiB
C#
97 lines
2.3 KiB
C#
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();
|
|
}
|
|
}
|
|
}
|