99 lines
3.0 KiB
C#
99 lines
3.0 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper236 800-in-1 //
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//////////////////////////////////////////////////////////////////////////
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using static VirtualNes.MMU;
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using static VirtualNes.Core.CPU;
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using INT = System.Int32;
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using BYTE = System.Byte;
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using System;
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using Codice.CM.Client.Differences;
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namespace VirtualNes.Core
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{
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public class Mapper236 : Mapper
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{
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BYTE bank, mode;
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public Mapper236(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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bank = mode = 0;
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}
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//void Mapper236::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 >= 0x8000 && addr <= 0xBFFF)
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{
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bank = (byte)(((addr & 0x03) << 4) | (bank & 0x07));
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}
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else
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{
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bank = (byte)((addr & 0x07) | (bank & 0x30));
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mode = (byte)(addr & 0x30);
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}
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if ((addr & 0x20) != 0)
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{
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SetVRAM_Mirror(VRAM_HMIRROR);
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}
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else
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{
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SetVRAM_Mirror(VRAM_VMIRROR);
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}
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switch (mode)
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{
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case 0x00:
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bank |= 0x08;
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SetPROM_8K_Bank(4, bank * 2 + 0);
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SetPROM_8K_Bank(5, bank * 2 + 1);
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SetPROM_8K_Bank(6, (bank | 0x07) * 2 + 0);
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SetPROM_8K_Bank(7, (bank | 0x07) * 2 + 1);
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break;
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case 0x10:
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bank |= 0x37;
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SetPROM_8K_Bank(4, bank * 2 + 0);
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SetPROM_8K_Bank(5, bank * 2 + 1);
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SetPROM_8K_Bank(6, (bank | 0x07) * 2 + 0);
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SetPROM_8K_Bank(7, (bank | 0x07) * 2 + 1);
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break;
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case 0x20:
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bank |= 0x08;
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SetPROM_8K_Bank(4, (bank & 0xFE) * 2 + 0);
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SetPROM_8K_Bank(5, (bank & 0xFE) * 2 + 1);
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SetPROM_8K_Bank(6, (bank & 0xFE) * 2 + 2);
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SetPROM_8K_Bank(7, (bank & 0xFE) * 2 + 3);
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break;
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case 0x30:
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bank |= 0x08;
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SetPROM_8K_Bank(4, bank * 2 + 0);
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SetPROM_8K_Bank(5, bank * 2 + 1);
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SetPROM_8K_Bank(6, bank * 2 + 0);
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SetPROM_8K_Bank(7, bank * 2 + 1);
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break;
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}
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}
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//void Mapper236::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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p[0] = bank;
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p[1] = mode;
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}
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//void Mapper236::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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bank = p[0];
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mode = p[1];
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}
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}
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}
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