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diff --git a/boards/01-222.c b/boards/01-222.c
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+++ b/boards/01-222.c
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+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2006 CaH4e3
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * TXC mappers
+ */
+
+#include "mapinc.h"
+
+static uint8 reg[4], cmd, is172, is173;
+static SFORMAT StateRegs[]=
+{
+  {reg, 4, "REGS"},
+  {&cmd, 1, "CMD"},
+  {0}
+};
+
+static void Sync(void)
+{
+  setprg32(0x8000,(reg[2]>>2)&1);
+  if(is172)
+    setchr8((((cmd^reg[2])>>3)&2)|(((cmd^reg[2])>>5)&1)); // 1991 DU MA Racing probably CHR bank sequence is WRONG, so it is possible to
+                                                          // rearrange CHR banks for normal UNIF board and mapper 172 is unneccessary
+  else
+    setchr8(reg[2]&3);
+}
+
+static DECLFW(UNL22211WriteLo)
+{
+//  FCEU_printf("bs %04x %02x\n",A,V);
+  reg[A&3]=V;
+}
+
+static DECLFW(UNL22211WriteHi)
+{
+//  FCEU_printf("bs %04x %02x\n",A,V);
+  cmd=V;
+  Sync();
+}
+
+static DECLFR(UNL22211ReadLo)
+{
+    return (reg[1]^reg[2])|(is173?0x01:0x40);
+//  if(reg[3])
+//    return reg[2];
+//  else
+//    return X.DB;
+}
+
+static void UNL22211Power(void)
+{
+  Sync();
+  SetReadHandler(0x8000,0xFFFF,CartBR);
+  SetReadHandler(0x4100,0x4100,UNL22211ReadLo);
+  SetWriteHandler(0x4100,0x4103,UNL22211WriteLo);
+  SetWriteHandler(0x8000,0xFFFF,UNL22211WriteHi);
+}
+
+static void StateRestore(int version)
+{
+  Sync();
+}
+
+void UNL22211_Init(CartInfo *info)
+{
+  is172=0;
+  is173=0;
+  info->Power=UNL22211Power;
+  GameStateRestore=StateRestore;
+  AddExState(&StateRegs, ~0, 0, 0);
+}
+
+void Mapper172_Init(CartInfo *info)
+{
+  is172=1;  
+  is173=0;
+  info->Power=UNL22211Power;
+  GameStateRestore=StateRestore;
+  AddExState(&StateRegs, ~0, 0, 0);
+}
+
+void Mapper173_Init(CartInfo *info)
+{
+  is172=0;  
+  is173=1;
+  info->Power=UNL22211Power;
+  GameStateRestore=StateRestore;
+  AddExState(&StateRegs, ~0, 0, 0);
+}