forked from sin365/AxibugEmuOnline
109 lines
2.4 KiB
C#
109 lines
2.4 KiB
C#
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();
|
|
}
|
|
}
|
|
}
|