102 lines
2.1 KiB
C#
102 lines
2.1 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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//generally mapper2
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//Mega Man
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//Castlevania
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//Contra
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//Duck Tales
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//Metal Gear
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//TODO - look for a mirror=H UNROM--maybe there are none? this may be fixed to the board type.
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[NES.INESBoardImplPriority]
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public class UxROM : NES.NESBoardBase
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{
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//configuration
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int prg_mask;
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int vram_byte_mask;
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Func<int, int> adjust_prg;
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//state
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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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adjust_prg = (x) => x;
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//configure
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switch (Cart.board_type)
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{
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case "MAPPER002":
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break;
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case "NES-UNROM": //mega man
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case "HVC-UNROM":
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case "KONAMI-UNROM":
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AssertPrg(128); AssertChr(0); AssertVram(8);
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//AssertWram(0); //JJ - Tobidase Daisakusen Part 2 (J) includes WRAM
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break;
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case "HVC-UN1ROM":
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AssertPrg(128); AssertChr(0); AssertWram(0); AssertVram(8);
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adjust_prg = (x) => ((x >> 2) & 7);
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break;
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case "NES-UOROM": //paperboy 2
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case "HVC-UOROM":
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AssertPrg(256); AssertChr(0); AssertVram(8); AssertWram(0);
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break;
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default:
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return false;
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}
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//these boards always have 8KB of VRAM
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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 = adjust_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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} |