72 lines
2.1 KiB
C#
72 lines
2.1 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper227 1200-in-1 //
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//////////////////////////////////////////////////////////////////////////
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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 Mapper227 : Mapper
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{
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public Mapper227(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, 0, 1);
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}
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//void Mapper227::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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BYTE bank = (byte)(((addr & 0x0100) >> 4) | ((addr & 0x0078) >> 3));
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if ((addr & 0x0001) != 0)
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{
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SetPROM_32K_Bank(bank);
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}
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else
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{
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if ((addr & 0x0004) != 0)
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{
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SetPROM_8K_Bank(4, bank * 4 + 2);
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SetPROM_8K_Bank(5, bank * 4 + 3);
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SetPROM_8K_Bank(6, bank * 4 + 2);
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SetPROM_8K_Bank(7, bank * 4 + 3);
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}
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else
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{
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SetPROM_8K_Bank(4, bank * 4 + 0);
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SetPROM_8K_Bank(5, bank * 4 + 1);
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SetPROM_8K_Bank(6, bank * 4 + 0);
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SetPROM_8K_Bank(7, bank * 4 + 1);
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}
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}
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if (!((addr & 0x0080) != 0))
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{
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if ((addr & 0x0200) != 0)
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{
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SetPROM_8K_Bank(6, (bank & 0x1C) * 4 + 14);
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SetPROM_8K_Bank(7, (bank & 0x1C) * 4 + 15);
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}
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else
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{
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SetPROM_8K_Bank(6, (bank & 0x1C) * 4 + 0);
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SetPROM_8K_Bank(7, (bank & 0x1C) * 4 + 1);
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}
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}
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if ((addr & 0x0002) != 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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}
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}
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}
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