231 lines
6.9 KiB
C#
231 lines
6.9 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper160 PC-Aladdin //
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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 Mapper160 : 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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BYTE refresh_type;
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public Mapper160(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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SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
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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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refresh_type = 0;
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}
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//void Mapper160::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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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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SetPROM_8K_Bank(6, data);
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break;
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case 0x9000:
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if (data == 0x2B)
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{
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refresh_type = 1;
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}
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else if (data == 0xA8)
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{
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refresh_type = 2;
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}
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else if (data == 0x1F)
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{
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refresh_type = 3;
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}
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else if (data == 0x7C)
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{
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refresh_type = 4;
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}
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else if (data == 0x18)
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{
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refresh_type = 5;
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}
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else if (data == 0x60)
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{
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refresh_type = 6;
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}
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else
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{
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refresh_type = 0;
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}
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SetVROM_1K_Bank(0, data);
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break;
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case 0x9001:
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SetVROM_1K_Bank(1, data);
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break;
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case 0x9002:
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if (refresh_type == 2 && data != 0xE8)
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{
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refresh_type = 0;
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}
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SetVROM_1K_Bank(2, data);
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break;
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case 0x9003:
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SetVROM_1K_Bank(3, data);
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break;
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case 0x9004:
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SetVROM_1K_Bank(4, data);
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break;
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case 0x9005:
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SetVROM_1K_Bank(5, data);
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break;
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case 0x9006:
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SetVROM_1K_Bank(6, data);
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break;
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case 0x9007:
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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 = irq_latch;
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irq_enable = irq_latch;
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break;
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case 0xC001:
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irq_latch = data;
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break;
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case 0xC002:
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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 0xC003:
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irq_counter = data;
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break;
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}
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}
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//void Mapper160::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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switch (refresh_type)
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{
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case 1:
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SetVROM_8K_Bank(0x58, 0x59, 0x5A, 0x5B, 0x58, 0x59, 0x5A, 0x5B);
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break;
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case 2:
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SetVROM_8K_Bank(0x78, 0x79, 0x7A, 0x7B, 0x78, 0x79, 0x7A, 0x7B);
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break;
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case 3:
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SetVROM_8K_Bank(0x7C, 0x7D, 0x7E, 0x7F, 0x7C, 0x7D, 0x7E, 0x7F);
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break;
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case 5:
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SetVROM_8K_Bank(0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77);
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break;
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case 6:
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SetVROM_8K_Bank(0x5C, 0x5D, 0x5E, 0x5F, 0x7C, 0x7D, 0x7E, 0x7F);
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break;
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}
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}
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if (scanline == 64)
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{
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if (refresh_type == 4)
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{
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if (PPU_MEM_BANK[8][32 * 10 + 16] == 0x0A)
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{
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SetVROM_1K_Bank(0, 0x68);
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SetVROM_1K_Bank(1, 0x69);
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SetVROM_1K_Bank(2, 0x6A);
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SetVROM_1K_Bank(3, 0x6B);
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}
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else
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{
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SetVROM_1K_Bank(0, 0x6C);
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SetVROM_1K_Bank(1, 0x6D);
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SetVROM_1K_Bank(2, 0x6E);
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SetVROM_1K_Bank(3, 0x6F);
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}
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}
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}
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if (scanline == 128)
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{
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if (refresh_type == 4)
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{
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SetVROM_1K_Bank(0, 0x68);
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SetVROM_1K_Bank(1, 0x69);
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SetVROM_1K_Bank(2, 0x6A);
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SetVROM_1K_Bank(3, 0x6B);
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}
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else if (refresh_type == 5)
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{
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SetVROM_8K_Bank(0x74, 0x75, 0x76, 0x77, 0x74, 0x75, 0x76, 0x77);
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}
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}
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if (scanline == 160)
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{
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if (refresh_type == 6)
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{
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SetVROM_8K_Bank(0x60, 0x61, 0x5E, 0x5F, 0x7C, 0x7D, 0x7E, 0x7F);
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}
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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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irq_enable = 0;
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irq_counter = 0;
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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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//void Mapper160::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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p[3] = refresh_type;
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}
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//
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//void Mapper160::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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refresh_type = 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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