72 lines
1.5 KiB
C#
72 lines
1.5 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.Cores.Nintendo.NES
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{
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public sealed class Farid_UNROM_8_in_1 : NES.NESBoardBase
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{
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// http://forums.nesdev.com/viewtopic.php?f=9&t=11099
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// state
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int c; // clock bit for the second 74'161
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int e; // /load for second 74'161. guaranteed to be 0 on powerup
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int prginner;
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int prgouter; // guaranteed to be 0 on powerup
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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 "UNIF_FARID_UNROM_8-IN-1":
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AssertPrg(1024);
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AssertChr(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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Cart.vram_size = 8;
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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 void WritePRG(int addr, byte value)
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{
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prginner = value & 7;
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int newc = value >> 7;
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int newe = value >> 3 & 1;
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if (newc > c && e == 0) // latch e and outer
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{
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e = newe;
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prgouter = value >> 4 & 7;
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}
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c = newc;
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}
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public override byte ReadPRG(int addr)
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{
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int bnk = addr >= 0x4000 ? 7 : prginner;
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bnk |= prgouter << 3;
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return ROM[bnk << 14 | addr & 0x3fff];
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}
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public override void SyncState(BizHawk.Common.Serializer ser)
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{
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base.SyncState(ser);
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ser.Sync("c", ref c);
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ser.Sync("e", ref e);
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ser.Sync("prginner", ref prginner);
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ser.Sync("prgouter", ref prgouter);
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}
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public override void NESSoftReset()
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{
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e = 0;
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prgouter = 0;
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}
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}
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}
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