54 lines
1.3 KiB
C#
54 lines
1.3 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper231 20-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 Mapper231 : Mapper
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{
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public Mapper231(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);
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if (VROM_1K_SIZE != 0)
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{
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SetVROM_8K_Bank(0);
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}
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}
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//void Mapper231::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 & 0x0020) != 0)
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{
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SetPROM_32K_Bank((BYTE)(addr >> 1));
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}
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else
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{
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BYTE bank = (byte)(addr & 0x1E);
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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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}
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if ((addr & 0x0080) != 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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