91 lines
2.4 KiB
C#
91 lines
2.4 KiB
C#
using System;
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using System.IO;
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using System.Diagnostics;
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namespace BizHawk.Emulation.Consoles.Nintendo
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{
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class Mapper015 : NES.NESBoardBase
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{
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//configuration
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int prg_bank_mask_8k;
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//state
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ByteBuffer prg_banks_8k = new ByteBuffer(4);
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public override bool Configure(NES.EDetectionOrigin origin)
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{
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//configure
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switch (Cart.board_type)
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{
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case "MAPPER015":
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break;
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default:
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return false;
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}
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prg_bank_mask_8k = (Cart.prg_size / 8) - 1;
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prg_banks_8k[0] = 0;
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prg_banks_8k[1] = 1;
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prg_banks_8k[2] = 2;
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prg_banks_8k[3] = 3;
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ApplyMemoryMapMask(prg_bank_mask_8k, prg_banks_8k);
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return true;
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}
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public override byte ReadPRG(int addr)
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{
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addr = ApplyMemoryMap(13, prg_banks_8k, addr);
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return ROM[addr];
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}
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public override void WritePRG(int addr, byte value)
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{
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int mode = addr & 3;
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int prg_high = value & 0x3F;
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bool prg_low = value.Bit(7);
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int prg_low_val = prg_low ? 1 : 0;
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bool mirror = value.Bit(6);
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SetMirrorType(mirror ? EMirrorType.Horizontal : EMirrorType.Vertical);
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switch(mode)
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{
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case 0:
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prg_banks_8k[0] = (byte)((prg_high * 2 + 0) ^ prg_low_val);
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prg_banks_8k[1] = (byte)((prg_high * 2 + 1) ^ prg_low_val);
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prg_banks_8k[2] = (byte)((prg_high * 2 + 2) ^ prg_low_val);
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prg_banks_8k[3] = (byte)((prg_high * 2 + 3) ^ prg_low_val);
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break;
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case 1:
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prg_banks_8k[0] = (byte)((prg_high*2+0) ^ prg_low_val);
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prg_banks_8k[1] = (byte)((prg_high*2+1) ^ prg_low_val);
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prg_banks_8k[2] = (byte)(0xFE);
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prg_banks_8k[3] = (byte)(0xFF);
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//maybe all 4?
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break;
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case 2:
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prg_banks_8k[0] = (byte)((prg_high * 2 + 0) ^ prg_low_val);
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prg_banks_8k[1] = (byte)((prg_high * 2 + 0) ^ prg_low_val);
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prg_banks_8k[2] = (byte)((prg_high * 2 + 0) ^ prg_low_val);
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prg_banks_8k[3] = (byte)((prg_high * 2 + 0) ^ prg_low_val);
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break;
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case 3:
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prg_banks_8k[0] = (byte)((prg_high * 2 + 0) ^ prg_low_val);
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prg_banks_8k[1] = (byte)((prg_high * 2 + 1) ^ prg_low_val);
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prg_banks_8k[2] = (byte)((prg_high * 2 + 0) ^ prg_low_val);
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prg_banks_8k[3] = (byte)((prg_high * 2 + 1) ^ prg_low_val);
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break;
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}
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ApplyMemoryMapMask(prg_bank_mask_8k, prg_banks_8k);
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}
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public override void SyncState(Serializer ser)
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{
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base.SyncState(ser);
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ser.Sync("prg_banks_8k", ref prg_banks_8k);
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}
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}
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}
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