diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper242.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper242.cs
index 5e7f69693d..4462874763 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper242.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper242.cs
@@ -21,6 +21,15 @@ mirroring - both
     class Mapper242 : NES.NESBoardBase
     {
         int prg, mirror;
+        
+        public enum EMirrorType
+        {
+            Vertical, Horizontal,
+            OneScreenA, OneScreenB,
+            //unknown or controlled by the board
+            External
+        }
+
         public override bool Configure(NES.EDetectionOrigin origin)
         {
             //configure
@@ -36,19 +45,22 @@ mirroring - both
 
         public override byte ReadPPU(int addr)
         {
-            //SetMirroring(mirror, mirror, 0, 0); //?? TODO
+            if (mirror == 0)
+                SetMirrorType(0, 1);
+            else
+                SetMirrorType(1, 0);
+            SetMirrorType(Cart.pad_h, Cart.pad_v);
             return base.ReadPPU(addr);
         }
 
         public override byte ReadPRG(int addr)
         {
-            return VROM[addr + (prg * 0x8000)];
-            //return base.ReadPRG(addr);
+            return ROM[addr + (prg * 0x8000)];
         }
 
         public override void WriteWRAM(int addr, byte value)
         {
-            mirror = (addr & 0x01);
+            int mirror = (addr & 0x01);
             prg = (addr & 0x7F) >> 3;
             base.WriteWRAM(addr, value);
         }
diff --git a/BizHawk.MultiClient/output/gamedb.txt b/BizHawk.MultiClient/output/gamedb.txt
index a6a007838b..44e5ff8daf 100644
--- a/BizHawk.MultiClient/output/gamedb.txt
+++ b/BizHawk.MultiClient/output/gamedb.txt
@@ -2267,7 +2267,7 @@ sha1:CF655333DCE649A3C7060E9989860F2FC74E473A		Demon Sword (U)	NES		board=NES-SL
 sha1:7786BA1FE8E7E9E542EEB13CF2A6E2A1AD7F696D		Metal Gear (U)	NES		board=KONAMI-UNROM;PRG=128
 sha1:894F20405286F5F75133CE4648300E2C67972B40		Solomon's Key (U)	NES		board=NES-CNROM;PRG=32;CHR=32
 sha1:0C53B06E1D13AE917536BB39010914EA3D111FF5		Thunder & Lightning (U)	NES		board=NES-GNROM;PRG=128;CHR=32;bad
-sha1:9BDFF9A19265D84979F43F0F6E925A735DDEB38B		Wai Xing Zhan Shi (Ch)	NES		board=Mapper242;PRG=32;CHR=0;VRAM=8
+sha1:9BDFF9A19265D84979F43F0F6E925A735DDEB38B		Wai Xing Zhan Shi (Ch)	NES		board=Mapper242;PRG=512;CHR=0;VRAM=8
 
 ;these roms are from goodNES but they are confusingly messed up somehow
 sha1:192C543866F1037276D2778046ABEDCA84868E26		Bio Senshi Dan - Increaser To No Tatakai (J)	NES		board=JALECO-JF-14;PRG=128;CHR=128