87 lines
1.8 KiB
C#
87 lines
1.8 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.Boards
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{
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//generally mapper66
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//Doraemon
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//Dragon Power
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//Gumshoe
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//Thunder & Lightning
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//Super Mario Bros. + Duck Hunt
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//TODO - bus conflicts
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public class GxROM : NES.NESBoardBase
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{
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//configuraton
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int prg_mask, chr_mask;
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//state
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int prg, chr;
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public override bool Configure(NES.BootGodDB.Cart cart)
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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 "NES-GNROM":
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case "BANDAI-GNROM":
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case "HVC-GNROM":
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case "NES-MHROM":
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Assert(cart.chr_size == 8 || cart.chr_size == 16 || cart.chr_size == 32);
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BoardInfo.PRG_Size = (cart.board_type == "NES-MHROM" ? 64 : 128);
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BoardInfo.CHR_Size = cart.chr_size;
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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_mask = (BoardInfo.PRG_Size/8/2) - 1;
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chr_mask = (BoardInfo.CHR_Size / 8) - 1;
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SetMirrorType(cart.pad_h, cart.pad_v);
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//validate
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Assert(cart.prg_size == BoardInfo.PRG_Size);
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Assert(cart.chr_size == BoardInfo.CHR_Size);
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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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return ROM[addr + (prg<<15)];
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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 VROM[addr + (chr << 13)];
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}
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else return base.ReadPPU(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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chr = ((value & 3) & chr_mask);
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prg = (((value>>4) & 3) & prg_mask);
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}
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public override void SaveStateBinary(BinaryWriter bw)
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{
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base.SaveStateBinary(bw);
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bw.Write(chr);
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bw.Write(prg);
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}
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public override void LoadStateBinary(BinaryReader br)
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{
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base.LoadStateBinary(br);
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chr = br.ReadInt32();
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prg = br.ReadInt32();
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}
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}
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} |