142 lines
4.0 KiB
C#
142 lines
4.0 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper048 Taito TC190V //
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//////////////////////////////////////////////////////////////////////////
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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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namespace VirtualNes.Core
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{
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public class Mapper048 : Mapper
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{
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BYTE reg;
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BYTE irq_enable;
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BYTE irq_counter;
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public Mapper048(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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reg = 0;
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irq_enable = 0;
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irq_counter = 0;
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SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
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SetVROM_8K_Bank(0);
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uint crc = nes.rom.GetPROM_CRC();
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// if( crc == 0x547e6cc1 ) { // Flintstones - The Rescue of Dino & Hoppy(J)
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// nes.SetRenderMethod( NES::POST_RENDER );
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// }
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}
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//void Mapper048::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)
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{
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case 0x8000:
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if (reg == 0)
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{
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if ((data & 0x40) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
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else SetVRAM_Mirror(VRAM_VMIRROR);
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}
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SetPROM_8K_Bank(4, data);
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break;
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case 0x8001:
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SetPROM_8K_Bank(5, data);
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break;
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case 0x8002:
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SetVROM_2K_Bank(0, data);
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break;
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case 0x8003:
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SetVROM_2K_Bank(2, data);
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break;
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case 0xA000:
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SetVROM_1K_Bank(4, data);
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break;
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case 0xA001:
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SetVROM_1K_Bank(5, data);
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break;
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case 0xA002:
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SetVROM_1K_Bank(6, data);
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break;
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case 0xA003:
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SetVROM_1K_Bank(7, data);
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break;
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case 0xC000:
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irq_counter = data;
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irq_enable = 0;
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// nes.cpu.ClrIRQ( IRQ_MAPPER );
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break;
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case 0xC001:
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irq_counter = data;
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irq_enable = 1;
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// irq_enable = data & 0x01;
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// nes.cpu.ClrIRQ( IRQ_MAPPER );
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break;
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case 0xC002:
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break;
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case 0xC003:
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break;
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case 0xE000:
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if ((data & 0x40) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
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else SetVRAM_Mirror(VRAM_VMIRROR);
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reg = 1;
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break;
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}
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}
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//void Mapper048::HSync(INT scanline)
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public override void HSync(int scanline)
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{
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if ((scanline >= 0 && scanline <= 239))
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{
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if (nes.ppu.IsDispON())
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{
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if (irq_enable != 0)
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{
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if (irq_counter == 0xFF)
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{
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// nes.cpu.IRQ_NotPending();
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// nes.cpu.SetIRQ( IRQ_MAPPER );
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nes.cpu.SetIRQ(IRQ_TRIGGER2);
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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 Mapper048::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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p[0] = reg;
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p[1] = irq_enable;
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p[2] = irq_counter;
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}
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//void Mapper048::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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reg = p[0];
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irq_enable = p[1];
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irq_counter = p[2];
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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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