173 lines
4.2 KiB
C#
173 lines
4.2 KiB
C#
using System.IO;
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namespace MyNes.Core
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{
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[BoardInfo("Taito TC0190/TC0350", 48, true, true)]
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internal class Mapper048 : Board
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{
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private bool MODE;
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private bool irq_enabled;
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private byte irq_counter;
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private int old_irq_counter;
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private byte irq_reload;
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private bool irq_clear;
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private bool mmc3_alt_behavior;
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internal override void HardReset()
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{
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base.HardReset();
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Switch16KPRG(PRG_ROM_16KB_Mask, PRGArea.AreaC000);
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MODE = false;
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if (IsGameFoundOnDB)
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{
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foreach (string chip in base.Chips)
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{
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if (chip.Contains("TC0350"))
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{
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MODE = true;
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break;
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}
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}
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}
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irq_enabled = false;
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irq_counter = 0;
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irq_reload = byte.MaxValue;
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old_irq_counter = 0;
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mmc3_alt_behavior = false;
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irq_clear = false;
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}
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internal override void WritePRG(ref ushort address, ref byte data)
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{
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if (!MODE)
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{
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switch (address & 0xE003)
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{
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case 32768:
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Switch08KPRG(data, PRGArea.Area8000);
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break;
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case 32769:
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Switch08KPRG(data, PRGArea.AreaA000);
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break;
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case 32770:
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Switch02KCHR(data, CHRArea.Area0000);
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break;
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case 32771:
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Switch02KCHR(data, CHRArea.Area0800);
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break;
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case 40960:
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Switch01KCHR(data, CHRArea.Area1000);
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break;
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case 40961:
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Switch01KCHR(data, CHRArea.Area1400);
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break;
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case 40962:
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Switch01KCHR(data, CHRArea.Area1800);
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break;
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case 40963:
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Switch01KCHR(data, CHRArea.Area1C00);
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break;
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case 49152:
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irq_reload = (byte)(data ^ 0xFFu);
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break;
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case 49153:
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if (mmc3_alt_behavior)
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{
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irq_clear = true;
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}
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irq_counter = 0;
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break;
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case 49154:
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irq_enabled = false;
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NesEmu.IRQFlags &= -9;
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break;
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case 49155:
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irq_enabled = true;
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break;
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case 57344:
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Switch01KNMTFromMirroring(((data & 0x40) == 64) ? Mirroring.Horz : Mirroring.Vert);
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break;
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}
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}
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else
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{
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switch (address & 0xA003)
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{
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case 32768:
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Switch01KNMTFromMirroring(((data & 0x40) == 64) ? Mirroring.Horz : Mirroring.Vert);
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Switch08KPRG(data & 0x3F, PRGArea.Area8000);
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break;
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case 32769:
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Switch08KPRG(data & 0x3F, PRGArea.AreaA000);
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break;
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case 32770:
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Switch02KCHR(data, CHRArea.Area0000);
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break;
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case 32771:
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Switch02KCHR(data, CHRArea.Area0800);
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break;
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case 40960:
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Switch01KCHR(data, CHRArea.Area1000);
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break;
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case 40961:
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Switch01KCHR(data, CHRArea.Area1400);
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break;
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case 40962:
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Switch01KCHR(data, CHRArea.Area1800);
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break;
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case 40963:
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Switch01KCHR(data, CHRArea.Area1C00);
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break;
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}
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}
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}
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internal override void OnPPUA12RaisingEdge()
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{
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if (!MODE)
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{
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old_irq_counter = irq_counter;
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if (irq_counter == 0 || irq_clear)
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{
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irq_counter = irq_reload;
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}
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else
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{
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irq_counter--;
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}
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if ((!mmc3_alt_behavior || old_irq_counter != 0 || irq_clear) && irq_counter == 0 && irq_enabled)
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{
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NesEmu.IRQFlags |= 8;
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}
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irq_clear = false;
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}
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}
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internal override void WriteStateData(ref BinaryWriter stream)
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{
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base.WriteStateData(ref stream);
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stream.Write(irq_enabled);
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stream.Write(irq_counter);
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stream.Write(old_irq_counter);
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stream.Write(irq_reload);
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stream.Write(irq_clear);
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}
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internal override void ReadStateData(ref BinaryReader stream)
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{
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base.ReadStateData(ref stream);
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irq_enabled = stream.ReadBoolean();
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irq_counter = stream.ReadByte();
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old_irq_counter = stream.ReadInt32();
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irq_reload = stream.ReadByte();
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irq_clear = stream.ReadBoolean();
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}
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}
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}
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