97 lines
2.2 KiB
C#
97 lines
2.2 KiB
C#
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using System.IO;
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namespace MyNes.Core
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{
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[BoardInfo("HK-SF3", 91, true, true)]
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internal class Mapper091 : Board
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{
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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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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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}
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internal override void WriteSRM(ref ushort address, ref byte data)
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{
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switch (address & 0x7003)
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{
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case 24576:
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Switch02KCHR(data, CHRArea.Area0000);
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break;
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case 24577:
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Switch02KCHR(data, CHRArea.Area0800);
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break;
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case 24578:
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Switch02KCHR(data, CHRArea.Area1000);
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break;
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case 24579:
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Switch02KCHR(data, CHRArea.Area1800);
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break;
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case 28672:
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Switch08KPRG(data & 0xF, PRGArea.Area8000);
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break;
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case 28673:
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Switch08KPRG(data & 0xF, PRGArea.AreaA000);
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break;
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case 28674:
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irq_enabled = false;
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NesEmu.IRQFlags &= -9;
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break;
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case 28675:
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irq_enabled = true;
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irq_reload = 7;
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irq_counter = 0;
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break;
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}
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}
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internal override void OnPPUA12RaisingEdge()
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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 ((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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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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