AxibugEmuOnline/AxibugEmuOnline.Client/Assets/MyNes.Core/Mapper064.cs
2024-07-03 18:22:22 +08:00

259 lines
6.2 KiB
C#

using System.IO;
namespace MyNes.Core
{
[BoardInfo("Tengen RAMBO-1", 64, true, true)]
internal class Mapper064 : Board
{
private bool flag_c;
private bool flag_p;
private bool flag_k;
private int address_8001;
private int[] chr_reg;
private int[] prg_reg;
private bool irq_enabled;
private byte irq_counter;
private byte irq_reload;
private bool irq_mode;
private bool irq_clear;
private int irq_prescaler;
internal override void HardReset()
{
base.HardReset();
flag_c = (flag_p = (flag_k = false));
address_8001 = 0;
prg_reg = new int[3];
prg_reg[0] = 0;
prg_reg[1] = 1;
prg_reg[2] = 2;
Switch08KPRG(PRG_ROM_08KB_Mask, PRGArea.AreaE000);
SetupPRG();
chr_reg = new int[8];
for (int i = 0; i < 8; i++)
{
chr_reg[i] = i;
}
SetupCHR();
irq_enabled = false;
irq_counter = 0;
irq_prescaler = 0;
irq_mode = false;
irq_reload = byte.MaxValue;
irq_clear = false;
}
internal override void WritePRG(ref ushort address, ref byte data)
{
switch (address & 0xE001)
{
case 32768:
address_8001 = data & 0xF;
flag_c = (data & 0x80) != 0;
flag_p = (data & 0x40) != 0;
flag_k = (data & 0x20) != 0;
SetupCHR();
SetupPRG();
break;
case 32769:
switch (address_8001)
{
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
chr_reg[address_8001] = data;
SetupCHR();
break;
case 6:
case 7:
prg_reg[address_8001 - 6] = data;
SetupPRG();
break;
case 8:
chr_reg[6] = data;
SetupCHR();
break;
case 9:
chr_reg[7] = data;
SetupCHR();
break;
case 15:
prg_reg[2] = data;
SetupPRG();
break;
case 10:
case 11:
case 12:
case 13:
case 14:
break;
}
break;
case 40960:
if (NMT_DEFAULT_MIRROR != Mirroring.Full)
{
Switch01KNMTFromMirroring(((data & 1) == 1) ? Mirroring.Horz : Mirroring.Vert);
}
break;
case 49152:
irq_reload = data;
break;
case 49153:
irq_mode = (data & 1) == 1;
irq_clear = true;
irq_prescaler = 0;
break;
case 57344:
irq_enabled = false;
NesEmu.IRQFlags &= -9;
break;
case 57345:
irq_enabled = true;
break;
}
}
private void SetupCHR()
{
if (!flag_c)
{
if (!flag_k)
{
Switch02KCHR(chr_reg[0] >> 1, CHRArea.Area0000);
Switch02KCHR(chr_reg[1] >> 1, CHRArea.Area0800);
}
else
{
Switch01KCHR(chr_reg[0], CHRArea.Area0000);
Switch01KCHR(chr_reg[6], CHRArea.Area0400);
Switch01KCHR(chr_reg[1], CHRArea.Area0800);
Switch01KCHR(chr_reg[7], CHRArea.Area0C00);
}
Switch01KCHR(chr_reg[2], CHRArea.Area1000);
Switch01KCHR(chr_reg[3], CHRArea.Area1400);
Switch01KCHR(chr_reg[4], CHRArea.Area1800);
Switch01KCHR(chr_reg[5], CHRArea.Area1C00);
}
else
{
if (!flag_k)
{
Switch02KCHR(chr_reg[0] >> 1, CHRArea.Area1000);
Switch02KCHR(chr_reg[1] >> 1, CHRArea.Area1800);
}
else
{
Switch01KCHR(chr_reg[0], CHRArea.Area1000);
Switch01KCHR(chr_reg[6], CHRArea.Area1400);
Switch01KCHR(chr_reg[1], CHRArea.Area1800);
Switch01KCHR(chr_reg[7], CHRArea.Area1C00);
}
Switch01KCHR(chr_reg[2], CHRArea.Area0000);
Switch01KCHR(chr_reg[3], CHRArea.Area0400);
Switch01KCHR(chr_reg[4], CHRArea.Area0800);
Switch01KCHR(chr_reg[5], CHRArea.Area0C00);
}
}
private void SetupPRG()
{
Switch08KPRG(prg_reg[flag_p ? 2 : 0], PRGArea.Area8000);
Switch08KPRG(prg_reg[(!flag_p) ? 1u : 0u], PRGArea.AreaA000);
Switch08KPRG(prg_reg[flag_p ? 1 : 2], PRGArea.AreaC000);
}
internal override void OnPPUA12RaisingEdge()
{
ClockIRQ();
}
internal override void OnCPUClock()
{
if (irq_mode)
{
irq_prescaler++;
if (irq_prescaler == 4)
{
irq_prescaler = 0;
ClockIRQ();
}
}
}
private void ClockIRQ()
{
if (irq_clear)
{
irq_counter = (byte)(irq_reload + 1);
irq_clear = false;
}
else if (irq_counter == 0)
{
irq_counter = irq_reload;
}
else if (--irq_counter == 0 && irq_enabled)
{
NesEmu.IRQFlags |= 8;
}
}
internal override void WriteStateData(ref BinaryWriter stream)
{
base.WriteStateData(ref stream);
stream.Write(flag_c);
stream.Write(flag_p);
stream.Write(address_8001);
for (int i = 0; i < chr_reg.Length; i++)
{
stream.Write(chr_reg[i]);
}
for (int j = 0; j < prg_reg.Length; j++)
{
stream.Write(prg_reg[j]);
}
stream.Write(irq_enabled);
stream.Write(irq_counter);
stream.Write(irq_reload);
stream.Write(irq_clear);
stream.Write(irq_prescaler);
stream.Write(irq_mode);
}
internal override void ReadStateData(ref BinaryReader stream)
{
base.ReadStateData(ref stream);
flag_c = stream.ReadBoolean();
flag_p = stream.ReadBoolean();
address_8001 = stream.ReadInt32();
for (int i = 0; i < chr_reg.Length; i++)
{
chr_reg[i] = stream.ReadInt32();
}
for (int j = 0; j < prg_reg.Length; j++)
{
prg_reg[j] = stream.ReadInt32();
}
irq_enabled = stream.ReadBoolean();
irq_counter = stream.ReadByte();
irq_reload = stream.ReadByte();
irq_clear = stream.ReadBoolean();
irq_prescaler = stream.ReadInt32();
irq_mode = stream.ReadBoolean();
}
}
}