178 lines
4.9 KiB
C#
178 lines
4.9 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper024 Konami VRC6 (Normal) //
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//////////////////////////////////////////////////////////////////////////
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using System;
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using static VirtualNes.Core.CPU;
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using static VirtualNes.MMU;
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using BYTE = System.Byte;
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using INT = System.Int32;
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namespace VirtualNes.Core
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{
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public class Mapper024 : Mapper
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{
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BYTE irq_enable;
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BYTE irq_counter;
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BYTE irq_latch;
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INT irq_clock;
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public Mapper024(NES parent) : base(parent)
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{
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}
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public override void Reset()
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{
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irq_enable = 0;
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irq_counter = 0;
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irq_latch = 0;
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irq_clock = 0;
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SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
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if (VROM_1K_SIZE != 0)
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{
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SetVROM_8K_Bank(0);
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}
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nes.SetRenderMethod(EnumRenderMethod.POST_RENDER);
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// nes.SetRenderMethod( NES::PRE_RENDER );
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nes.apu.SelectExSound(1);
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}
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//void Mapper024::Write(WORD addr, BYTE data)
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public override void Write(ushort addr, byte data)
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{
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switch (addr & 0xF003)
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{
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case 0x8000:
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SetPROM_16K_Bank(4, data);
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break;
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case 0x9000:
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case 0x9001:
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case 0x9002:
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case 0xA000:
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case 0xA001:
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case 0xA002:
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case 0xB000:
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case 0xB001:
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case 0xB002:
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nes.apu.ExWrite(addr, data);
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break;
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case 0xB003:
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data = (byte)(data & 0x0C);
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if (data == 0x00) SetVRAM_Mirror(VRAM_VMIRROR);
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else if (data == 0x04) SetVRAM_Mirror(VRAM_HMIRROR);
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else if (data == 0x08) SetVRAM_Mirror(VRAM_MIRROR4L);
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else if (data == 0x0C) SetVRAM_Mirror(VRAM_MIRROR4H);
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break;
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case 0xC000:
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SetPROM_8K_Bank(6, data);
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break;
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case 0xD000:
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SetVROM_1K_Bank(0, data);
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break;
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case 0xD001:
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SetVROM_1K_Bank(1, data);
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break;
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case 0xD002:
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SetVROM_1K_Bank(2, data);
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break;
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case 0xD003:
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SetVROM_1K_Bank(3, data);
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break;
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case 0xE000:
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SetVROM_1K_Bank(4, data);
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break;
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case 0xE001:
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SetVROM_1K_Bank(5, data);
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break;
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case 0xE002:
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SetVROM_1K_Bank(6, data);
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break;
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case 0xE003:
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SetVROM_1K_Bank(7, data);
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break;
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case 0xF000:
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irq_latch = data;
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break;
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case 0xF001:
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irq_enable = (byte)(data & 0x03);
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if ((irq_enable & 0x02) != 0)
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{
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irq_counter = irq_latch;
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irq_clock = 0;
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}
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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break;
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case 0xF002:
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irq_enable = (byte)((irq_enable & 0x01) * 3);
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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break;
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}
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}
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//void Mapper024::Clock(INT cycles)
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public override void Clock(int cycles)
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{
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if ((irq_enable & 0x02) != 0)
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{
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if ((irq_clock += cycles) >= 0x72)
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{
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irq_clock -= 0x72;
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if (irq_counter == 0xFF)
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{
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irq_counter = irq_latch;
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// nes.cpu.IRQ_NotPending();
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nes.cpu.SetIRQ(IRQ_MAPPER);
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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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}
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}
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}
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//void Mapper024::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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p[0] = irq_enable;
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p[1] = irq_counter;
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p[2] = irq_latch;
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//*(INT*)&p[3] = irq_clock;
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BitConverter.GetBytes(irq_clock).CopyTo(p, 3);
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}
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//void Mapper024::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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irq_enable = p[0];
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irq_counter = p[1];
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irq_latch = p[2];
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//irq_clock = *(INT*)&p[3];
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irq_clock = BitConverter.ToInt32(p, 3);
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}
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public override bool IsStateSave()
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{
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return true;
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}
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}
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}
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