forked from sin365/AxibugEmuOnline
282 lines
9.0 KiB
C#
282 lines
9.0 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper025 Konami VRC4 (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 Mapper025 : Mapper
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{
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BYTE[] reg = new byte[11];
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BYTE irq_enable;
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BYTE irq_latch;
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BYTE irq_occur;
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BYTE irq_counter;
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INT irq_clock;
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public Mapper025(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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for (INT i = 0; i < 11; i++)
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{
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reg[i] = 0;
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}
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reg[9] = (byte)(PROM_8K_SIZE - 2);
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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_occur = 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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uint crc = nes.rom.GetPROM_CRC();
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if (crc == 0xc71d4ce7)
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{ // Gradius II(J)
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// nes.SetRenderMethod( NES::POST_RENDER );
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}
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if (crc == 0xa2e68da8)
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{ // For Racer Mini Yonku - Japan Cup(J)
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nes.SetRenderMethod(EnumRenderMethod.TILE_RENDER);
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}
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if (crc == 0xea74c587)
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{ // For Teenage Mutant Ninja Turtles(J)
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nes.SetRenderMethod(EnumRenderMethod.TILE_RENDER);
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}
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if (crc == 0x5f82cb7d)
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{ // For Teenage Mutant Ninja Turtles 2(J)
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}
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if (crc == 0x0bbd85ff)
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{ // For Bio Miracle Bokutte Upa(J)
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nes.SetRenderMethod(EnumRenderMethod.PRE_ALL_RENDER);
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}
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}
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//void Mapper025::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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//if( addr >= 0xF000 )
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//DEBUGOUT( "M25 WR $%04X=$%02X L=%3d\n", addr, data, nes.GetScanline() );
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switch (addr & 0xF000)
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{
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case 0x8000:
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if ((reg[10] & 0x02) != 0)
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{
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reg[9] = data;
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SetPROM_8K_Bank(6, data);
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}
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else
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{
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reg[8] = data;
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SetPROM_8K_Bank(4, data);
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}
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break;
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case 0xA000:
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SetPROM_8K_Bank(5, data);
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break;
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}
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switch (addr & 0xF00F)
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{
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case 0x9000:
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data &= 0x03;
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if (data == 0) SetVRAM_Mirror(VRAM_VMIRROR);
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else if (data == 1) SetVRAM_Mirror(VRAM_HMIRROR);
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else if (data == 2) SetVRAM_Mirror(VRAM_MIRROR4L);
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else SetVRAM_Mirror(VRAM_MIRROR4H);
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break;
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case 0x9001:
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case 0x9004:
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if ((reg[10] & 0x02) != (data & 0x02))
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{
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BYTE swap = reg[8];
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reg[8] = reg[9];
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reg[9] = swap;
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SetPROM_8K_Bank(4, reg[8]);
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SetPROM_8K_Bank(6, reg[9]);
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}
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reg[10] = data;
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break;
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case 0xB000:
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reg[0] = (byte)((reg[0] & 0xF0) | (data & 0x0F));
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SetVROM_1K_Bank(0, reg[0]);
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break;
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case 0xB002:
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case 0xB008:
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reg[0] = (byte)((reg[0] & 0x0F) | ((data & 0x0F) << 4));
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SetVROM_1K_Bank(0, reg[0]);
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break;
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case 0xB001:
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case 0xB004:
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reg[1] = (byte)((reg[1] & 0xF0) | (data & 0x0F));
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SetVROM_1K_Bank(1, reg[1]);
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break;
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case 0xB003:
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case 0xB00C:
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reg[1] = (byte)((reg[1] & 0x0F) | ((data & 0x0F) << 4));
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SetVROM_1K_Bank(1, reg[1]);
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break;
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case 0xC000:
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reg[2] = (byte)((reg[2] & 0xF0) | (data & 0x0F));
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SetVROM_1K_Bank(2, reg[2]);
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break;
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case 0xC002:
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case 0xC008:
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reg[2] = (byte)((reg[2] & 0x0F) | ((data & 0x0F) << 4));
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SetVROM_1K_Bank(2, reg[2]);
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break;
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case 0xC001:
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case 0xC004:
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reg[3] = (byte)((reg[3] & 0xF0) | (data & 0x0F));
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SetVROM_1K_Bank(3, reg[3]);
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break;
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case 0xC003:
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case 0xC00C:
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reg[3] = (byte)((reg[3] & 0x0F) | ((data & 0x0F) << 4));
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SetVROM_1K_Bank(3, reg[3]);
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break;
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case 0xD000:
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reg[4] = (byte)((reg[4] & 0xF0) | (data & 0x0F));
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SetVROM_1K_Bank(4, reg[4]);
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break;
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case 0xD002:
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case 0xD008:
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reg[4] = (byte)((reg[4] & 0x0F) | ((data & 0x0F) << 4));
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SetVROM_1K_Bank(4, reg[4]);
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break;
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case 0xD001:
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case 0xD004:
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reg[5] = (byte)((reg[5] & 0xF0) | (data & 0x0F));
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SetVROM_1K_Bank(5, reg[5]);
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break;
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case 0xD003:
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case 0xD00C:
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reg[5] = (byte)((reg[5] & 0x0F) | ((data & 0x0F) << 4));
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SetVROM_1K_Bank(5, reg[5]);
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break;
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case 0xE000:
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reg[6] = (byte)((reg[6] & 0xF0) | (data & 0x0F));
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SetVROM_1K_Bank(6, reg[6]);
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break;
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case 0xE002:
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case 0xE008:
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reg[6] = (byte)((reg[6] & 0x0F) | ((data & 0x0F) << 4));
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SetVROM_1K_Bank(6, reg[6]);
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break;
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case 0xE001:
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case 0xE004:
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reg[7] = (byte)((reg[7] & 0xF0) | (data & 0x0F));
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SetVROM_1K_Bank(7, reg[7]);
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break;
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case 0xE003:
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case 0xE00C:
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reg[7] = (byte)((reg[7] & 0x0F) | ((data & 0x0F) << 4));
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SetVROM_1K_Bank(7, reg[7]);
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break;
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case 0xF000:
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irq_latch = (byte)((irq_latch & 0xF0) | (data & 0x0F));
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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break;
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case 0xF002:
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case 0xF008:
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irq_latch = (byte)((irq_latch & 0x0F) | ((data & 0x0F) << 4));
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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break;
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case 0xF001:
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case 0xF004:
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irq_enable = (byte)(data & 0x03);
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// irq_counter = 0x100 - irq_latch;
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irq_counter = irq_latch;
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irq_clock = 0;
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nes.cpu.ClrIRQ(IRQ_MAPPER);
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break;
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case 0xF003:
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case 0xF00C:
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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 Mapper025::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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irq_clock += cycles * 3;
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while (irq_clock >= 341)
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{
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irq_clock -= 341;
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irq_counter++;
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if (irq_counter == 0)
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{
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irq_counter = irq_latch;
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nes.cpu.SetIRQ(IRQ_MAPPER);
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}
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}
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}
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}
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//void Mapper025::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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for (INT i = 0; i < 11; i++)
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{
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p[i] = reg[i];
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}
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p[11] = irq_enable;
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p[12] = irq_occur;
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p[13] = irq_latch;
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p[14] = irq_counter;
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//*((INT*)&p[15]) = irq_clock;
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BitConverter.GetBytes(irq_clock).CopyTo(p, 15);
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}
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//void Mapper025::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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for (INT i = 0; i < 11; i++)
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{
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reg[i] = p[i];
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}
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irq_enable = p[11];
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irq_occur = p[12];
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irq_latch = p[13];
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irq_counter = p[14];
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//irq_clock = *((INT*)&p[15]);
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irq_clock = BitConverter.ToInt32(p, 15);
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}
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}
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}
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