Start Mapper 46, could not get the gamedb.txt entry to work properly

BizHawk.Emulation/BizHawk.Emulation.csproj

@@ -118,6 +118,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper240.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper242.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper078.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\Mapper046.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\DRROM.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\HKROM.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper044.cs" />

BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper046.cs

@@ -0,0 +1,90 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Consoles.Nintendo
+{
+	class Mapper046 : NES.NESBoardBase
+	{
+		//Rumblestation 15-in-1 (Unl).nes
+		//TODO: WHy does the gamedb entry fail?
+
+		/*
+			Regs at $6000-7FFF means no PRG-RAM.
+
+			$6000-7FFF:  [CCCC PPPP]   High CHR, PRG bits
+			$8000-FFFF:  [.CCC ...P]   Low CHR, PRG bits
+ 
+			'C' selects 8k CHR @ $0000
+			'P' select 32k PRG @ $8000
+		 */
+		
+		//configuration
+		int prg_bank_mask_32k, chr_bank_mask_8k;
+
+		//state
+		int prg_bank_32k_H, prg_bank_32k_L,
+			chr_bank_8k_H, chr_bank_8k_L;
+
+		public override void WriteWRAM(int addr, byte value)
+		{
+			prg_bank_32k_H = value & 0x0F;
+			chr_bank_8k_H = value >> 4;
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			prg_bank_32k_L = value & 0x01;
+			chr_bank_8k_L = (value >> 4) & 0x07;
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				//TODO: High bits
+				return VROM[addr + (chr_bank_8k_L * 0x2000)];
+			}
+			else return base.ReadPPU(addr);
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			//TODO: High bits
+			return ROM[addr + (prg_bank_32k_L * 0x8000)];
+		}
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			//configure
+			switch (Cart.board_type)
+			{
+				case "MAPPER046":
+					break;
+				default:
+					return false;
+			}
+
+			prg_bank_mask_32k = Cart.prg_size / 32 - 1;
+			chr_bank_mask_8k = Cart.chr_size / 8 - 1;
+			SetMirrorType(Cart.pad_h, Cart.pad_v);
+
+			prg_bank_32k_H = 0;
+			prg_bank_32k_L = 0;
+			chr_bank_8k_H = 0;
+			chr_bank_8k_L = 0;
+
+			return true;
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("prg_bank_32k_H", ref prg_bank_32k_H);
+			ser.Sync("prg_bank_32k_L", ref prg_bank_32k_L);
+			ser.Sync("chr_bank_8k_H", ref chr_bank_8k_H);
+			ser.Sync("chr_bank_8k_L", ref chr_bank_8k_L);
+		}
+	}
+}

BizHawk.MultiClient/output/gamedb.txt

@@ -94,6 +94,7 @@ sha1:536D623BA02A622BDE8E2D7D514AE9785B5E0357	H	Punch Out!! Kirby (Hack) (U)	NES
 sha1:334DCB823B480957057C2B4C72686BE26823C12A	V	Fighting Hero (Unl)	NES		board=Mapper193;PRG=128;CHR=256;WRAM=8
 sha1:D09EF8127C64CBE817B45DF33C4D43E7B441E381		Final Fantasy V (Unl)	NES		board=Mapper164;PRG=512;CHR=0;WRAM=8;PRAM=8
 sha1:92D9695FEB774F60965A8303CFE3E6AAEE7B7B62		Magic Dragon (Unl)	NES		board=Mapper107;PRG=128;CHR=64;WRAM=8;PAD_H=1
+sha1:E2F19D010DE7FED40C2591C3966BA5A137935249		15-in-1 (Unl)	NES		board=Mapper046;PRG=128;CHR=64;WRAM=0
 
 #include gamedb_neshomebrew.txt
 #include gamedb_user.txt