73 lines
1.6 KiB
C#
73 lines
1.6 KiB
C#
////////////////////////////////
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// Mapper096 Bandai 74161 //
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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 Mapper096 : Mapper
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{
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BYTE[] reg = new byte[2];
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public Mapper096(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] = reg[1] = 0;
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SetPROM_32K_Bank(0, 1, 2, 3);
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SetBank();
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SetVRAM_Mirror(VRAM_MIRROR4L);
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}
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//void Mapper096::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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SetPROM_32K_Bank(data & 0x03);
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reg[0] = (byte)((data & 0x04) >> 2);
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SetBank();
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}
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public override void PPU_Latch(ushort addr)
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{
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if ((addr & 0xF000) == 0x2000)
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{
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reg[1] = (byte)((addr >> 8) & 0x03);
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SetBank();
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}
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}
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void SetBank()
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{
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SetCRAM_4K_Bank(0, reg[0] * 4 + reg[1]);
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SetCRAM_4K_Bank(4, reg[0] * 4 + 0x03);
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}
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//void Mapper096::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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p[0] = reg[0];
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p[1] = reg[1];
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}
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//void Mapper096::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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reg[0] = p[0];
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reg[1] = p[1];
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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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