74 lines
1.4 KiB
C#
74 lines
1.4 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace BizHawk.Emulation.Consoles.Nintendo
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{
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public class VsUnisys : NES.NESBoardBase
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{
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// this is a copy of UNROM until i figure out what the hell is going on
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int prg_mask;
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int vram_byte_mask;
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int prg;
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public override bool Configure(NES.EDetectionOrigin origin)
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{
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switch (Cart.board_type)
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{
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case "MAPPER099":
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break;
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default:
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return false;
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}
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vram_byte_mask = (Cart.vram_size * 1024) - 1;
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prg_mask = (Cart.prg_size / 16) - 1;
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SetMirrorType(Cart.pad_h, Cart.pad_v);
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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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int block = addr >> 14;
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int page = block == 1 ? prg_mask : prg;
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int ofs = addr & 0x3FFF;
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return ROM[(page << 14) | ofs];
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}
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public override void WritePRG(int addr, byte value)
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{
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prg = value & prg_mask;
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}
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public override byte ReadPPU(int addr)
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{
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if (addr < 0x2000)
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{
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return VRAM[addr & vram_byte_mask];
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}
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else return base.ReadPPU(addr);
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}
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public override void WritePPU(int addr, byte value)
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{
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if (addr < 0x2000)
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{
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VRAM[addr & vram_byte_mask] = value;
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}
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else base.WritePPU(addr, value);
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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", ref prg);
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}
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}
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}
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