From 8e467d4a464d503995515ece8a644c8f7089a510 Mon Sep 17 00:00:00 2001
From: adelikat <adelikat@tasvideos.org>
Date: Mon, 17 Oct 2016 17:34:54 -0500
Subject: [PATCH] NESHawk - support Reset Based 4-in-1

---
 .../Consoles/Nintendo/NES/Boards/Mapper60.cs  | 61 ++++++++++++++++++-
 1 file changed, 59 insertions(+), 2 deletions(-)

diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper60.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper60.cs
index 9ef990ac4c..d9ff278ff9 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper60.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper60.cs
@@ -1,4 +1,5 @@
-using BizHawk.Common;
+using System;
+using BizHawk.Common;
 using BizHawk.Common.NumberExtensions;
 
 namespace BizHawk.Emulation.Cores.Nintendo.NES
@@ -20,7 +21,13 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 			switch (Cart.board_type)
 			{
 				case "MAPPER060":
-					break;
+					// Hack, Reset 4-in-1 is a different board but still assign to mapper 60
+					if (Cart.prg_size != 64 || Cart.chr_size != 32)
+					{
+						break;
+					}
+
+					return false;
 				default:
 					return false;
 			}
@@ -75,4 +82,54 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 			return base.ReadPPU(addr);
 		}
 	}
+
+	public class Reset4in1 : NES.NESBoardBase
+	{
+		private int resetSwitch = 0;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER060":
+					// Hack, Reset 4-in-1 is a different board but still assign to mapper 60
+					if (Cart.prg_size == 64 && Cart.chr_size == 32)
+					{
+						break;
+					}
+					return false;
+				default:
+					return false;
+			}
+
+			return true;
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			ser.Sync("resetSwitch", ref resetSwitch);
+			base.SyncState(ser);
+		}
+
+		public override void NESSoftReset()
+		{
+			resetSwitch = (resetSwitch + 1) & 3;
+			base.NESSoftReset();
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			return ROM[(resetSwitch << 14) + (addr & 0x3FFF)];
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				return VROM[(resetSwitch << 13) + addr];
+			}
+
+			return base.ReadPPU(addr);
+		}
+	}
 }