forked from sin365/AxibugEmuOnline
172 lines
3.8 KiB
C#
172 lines
3.8 KiB
C#
using System.IO;
|
|
|
|
namespace MyNes.Core
|
|
{
|
|
[BoardInfo("VRC7", 85)]
|
|
[HassIssues]
|
|
internal class Mapper085 : Board
|
|
{
|
|
private int irq_reload;
|
|
|
|
private int irq_counter;
|
|
|
|
private int prescaler;
|
|
|
|
private bool irq_mode_cycle;
|
|
|
|
private bool irq_enable;
|
|
|
|
private bool irq_enable_on_ak;
|
|
|
|
internal override string Issues => MNInterfaceLanguage.IssueMapper85;
|
|
|
|
internal override void HardReset()
|
|
{
|
|
base.HardReset();
|
|
Switch08KPRG(PRG_ROM_08KB_Mask, PRGArea.AreaE000);
|
|
irq_reload = 0;
|
|
prescaler = 341;
|
|
irq_counter = 0;
|
|
irq_mode_cycle = false;
|
|
irq_enable = false;
|
|
irq_enable_on_ak = false;
|
|
}
|
|
|
|
internal override void WritePRG(ref ushort address, ref byte data)
|
|
{
|
|
switch (address)
|
|
{
|
|
case 32768:
|
|
Switch08KPRG(data, PRGArea.Area8000);
|
|
break;
|
|
case 32776:
|
|
case 32784:
|
|
Switch08KPRG(data, PRGArea.AreaA000);
|
|
break;
|
|
case 36864:
|
|
Switch08KPRG(data, PRGArea.AreaC000);
|
|
break;
|
|
case 40960:
|
|
Switch01KCHR(data, CHRArea.Area0000);
|
|
break;
|
|
case 40968:
|
|
case 40976:
|
|
Switch01KCHR(data, CHRArea.Area0400);
|
|
break;
|
|
case 45056:
|
|
Switch01KCHR(data, CHRArea.Area0800);
|
|
break;
|
|
case 45064:
|
|
case 45072:
|
|
Switch01KCHR(data, CHRArea.Area0C00);
|
|
break;
|
|
case 49152:
|
|
Switch01KCHR(data, CHRArea.Area1000);
|
|
break;
|
|
case 49160:
|
|
case 49168:
|
|
Switch01KCHR(data, CHRArea.Area1400);
|
|
break;
|
|
case 53248:
|
|
Switch01KCHR(data, CHRArea.Area1800);
|
|
break;
|
|
case 53256:
|
|
case 53264:
|
|
Switch01KCHR(data, CHRArea.Area1C00);
|
|
break;
|
|
case 57344:
|
|
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 57352:
|
|
case 57360:
|
|
irq_reload = data;
|
|
break;
|
|
case 61440:
|
|
irq_mode_cycle = (data & 4) == 4;
|
|
irq_enable = (data & 2) == 2;
|
|
irq_enable_on_ak = (data & 1) == 1;
|
|
if (irq_enable)
|
|
{
|
|
irq_counter = irq_reload;
|
|
prescaler = 341;
|
|
}
|
|
NesEmu.IRQFlags &= -9;
|
|
break;
|
|
case 61448:
|
|
case 61456:
|
|
NesEmu.IRQFlags &= -9;
|
|
irq_enable = irq_enable_on_ak;
|
|
break;
|
|
}
|
|
}
|
|
|
|
internal override void OnCPUClock()
|
|
{
|
|
if (!irq_enable)
|
|
{
|
|
return;
|
|
}
|
|
if (!irq_mode_cycle)
|
|
{
|
|
if (prescaler > 0)
|
|
{
|
|
prescaler -= 3;
|
|
return;
|
|
}
|
|
prescaler = 341;
|
|
irq_counter++;
|
|
if (irq_counter == 255)
|
|
{
|
|
NesEmu.IRQFlags |= 8;
|
|
irq_counter = irq_reload;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
irq_counter++;
|
|
if (irq_counter == 255)
|
|
{
|
|
NesEmu.IRQFlags |= 8;
|
|
irq_counter = irq_reload;
|
|
}
|
|
}
|
|
}
|
|
|
|
internal override void WriteStateData(ref BinaryWriter stream)
|
|
{
|
|
base.WriteStateData(ref stream);
|
|
stream.Write(prescaler);
|
|
stream.Write(irq_counter);
|
|
stream.Write(irq_mode_cycle);
|
|
stream.Write(irq_reload);
|
|
stream.Write(irq_enable);
|
|
stream.Write(irq_enable_on_ak);
|
|
}
|
|
|
|
internal override void ReadStateData(ref BinaryReader stream)
|
|
{
|
|
base.ReadStateData(ref stream);
|
|
prescaler = stream.ReadInt32();
|
|
irq_counter = stream.ReadInt32();
|
|
irq_mode_cycle = stream.ReadBoolean();
|
|
irq_reload = stream.ReadInt32();
|
|
irq_enable = stream.ReadBoolean();
|
|
irq_enable_on_ak = stream.ReadBoolean();
|
|
}
|
|
}
|
|
}
|