109 lines
2.4 KiB
C#
109 lines
2.4 KiB
C#
using System.IO;
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namespace MyNes.Core
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{
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[BoardInfo("Sunsoft 3", 67)]
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internal class Mapper067 : Board
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{
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private bool irq_enabled;
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private int irq_counter;
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private bool odd;
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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_enabled = false;
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irq_counter = 65535;
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odd = 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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switch (address & 0xF800)
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{
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case 34816:
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Switch02KCHR(data, CHRArea.Area0000);
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break;
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case 38912:
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Switch02KCHR(data, CHRArea.Area0800);
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break;
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case 43008:
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Switch02KCHR(data, CHRArea.Area1000);
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break;
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case 47104:
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Switch02KCHR(data, CHRArea.Area1800);
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break;
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case 51200:
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if (!odd)
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{
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irq_counter = (irq_counter & 0xFF) | (data << 8);
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}
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else
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{
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irq_counter = (irq_counter & 0xFF00) | data;
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}
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odd = !odd;
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break;
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case 55296:
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irq_enabled = (data & 0x10) == 16;
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odd = false;
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NesEmu.IRQFlags &= -9;
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break;
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case 59392:
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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 63488:
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Switch16KPRG(data, PRGArea.Area8000);
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break;
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}
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}
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internal override void OnCPUClock()
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{
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if (irq_enabled)
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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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irq_counter = 65535;
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NesEmu.IRQFlags |= 8;
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irq_enabled = false;
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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_enabled);
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stream.Write(irq_counter);
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stream.Write(odd);
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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.ReadInt32();
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odd = stream.ReadBoolean();
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}
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}
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}
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