142 lines
3.2 KiB
C#
142 lines
3.2 KiB
C#
using System.IO;
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namespace MyNes.Core
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{
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internal abstract class Bandai : Board
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{
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private bool irq_enable;
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private int irq_counter;
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private Eprom eprom;
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internal override void Initialize(IRom rom)
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{
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base.Initialize(rom);
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if (base.BoardType.ToLower().Contains("24c01"))
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{
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eprom = new Eprom(128);
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}
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else
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{
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eprom = new Eprom((base.MapperNumber == 16) ? 256 : 128);
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}
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}
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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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irq_enable = false;
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irq_counter = 0;
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eprom.HardReset();
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}
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internal override void WriteSRM(ref ushort address, ref byte data)
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{
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WritePRG(ref address, ref data);
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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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switch (address & 0xF)
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{
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case 0:
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Switch01KCHR(data, CHRArea.Area0000);
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break;
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case 1:
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Switch01KCHR(data, CHRArea.Area0400);
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break;
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case 2:
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Switch01KCHR(data, CHRArea.Area0800);
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break;
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case 3:
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Switch01KCHR(data, CHRArea.Area0C00);
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break;
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case 4:
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Switch01KCHR(data, CHRArea.Area1000);
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break;
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case 5:
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Switch01KCHR(data, CHRArea.Area1400);
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break;
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case 6:
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Switch01KCHR(data, CHRArea.Area1800);
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break;
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case 7:
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Switch01KCHR(data, CHRArea.Area1C00);
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break;
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case 8:
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Switch16KPRG(data, PRGArea.Area8000);
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break;
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case 9:
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switch (data & 3)
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{
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case 0:
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Switch01KNMTFromMirroring(Mirroring.Vert);
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break;
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case 1:
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Switch01KNMTFromMirroring(Mirroring.Horz);
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break;
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case 2:
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Switch01KNMTFromMirroring(Mirroring.OneScA);
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break;
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case 3:
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Switch01KNMTFromMirroring(Mirroring.OneScB);
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break;
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}
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break;
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case 10:
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irq_enable = (data & 1) == 1;
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NesEmu.IRQFlags &= -9;
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break;
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case 11:
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irq_counter = (irq_counter & 0xFF00) | data;
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break;
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case 12:
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irq_counter = (irq_counter & 0xFF) | (data << 8);
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break;
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case 13:
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eprom.Write(address, data);
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break;
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}
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}
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internal override void ReadSRM(ref ushort address, out byte value)
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{
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value = eprom.Read(address);
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}
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internal override void OnCPUClock()
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{
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if (irq_enable)
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{
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irq_counter--;
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if (irq_counter == 0)
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{
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NesEmu.IRQFlags |= 8;
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}
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if (irq_counter < 0)
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{
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irq_counter = 65535;
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}
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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_enable);
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stream.Write(irq_counter);
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eprom.SaveState(stream);
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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_enable = stream.ReadBoolean();
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irq_counter = stream.ReadInt32();
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eprom.LoadState(stream);
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}
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}
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}
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