diff --git a/src/boards/fk23c.cpp b/src/boards/fk23c.cpp
index 9617cdf3..7679d0ff 100644
--- a/src/boards/fk23c.cpp
+++ b/src/boards/fk23c.cpp
@@ -22,22 +22,33 @@
 #include "mmc3.h"
 #include "../ines.h"
 
+static bool is_BMCFK23CA;
 static uint8 unromchr;
 static uint32 dipswitch;
+static uint8 *CHRRAM=NULL;
+static uint32 CHRRAMSize;
 
 static void BMCFK23CCW(uint32 A, uint8 V)
 {
   if(EXPREGS[0]&0x40)
     setchr8(EXPREGS[2]|unromchr);
+  else if(EXPREGS[0]&0x20) {
+    setchr1r(0x10, A, V);
+  }
   else
   {
     uint16 base=(EXPREGS[2]&0x7F)<<3;
-    setchr1(A,V|base);
     if(EXPREGS[3]&2)
     {
-      setchr1(0x0400,EXPREGS[6]|base);
-      setchr1(0x0C00,EXPREGS[7]|base);
+      int cbase=(MMC3_cmd&0x80)<<5;
+      setchr1(A,V|base);
+      setchr1(0x0000^cbase,DRegBuf[0]|base);
+      setchr1(0x0400^cbase,EXPREGS[6]|base);
+      setchr1(0x0800^cbase,DRegBuf[1]|base);
+      setchr1(0x0c00^cbase,EXPREGS[7]|base);
     }
+    else
+      setchr1(A,V|base);
   }
 }
 
@@ -75,6 +86,11 @@ static int prg_mask;
 //PRG wrapper
 static void BMCFK23CPW(uint32 A, uint8 V)
 {
+  uint32 bank = (EXPREGS[1] & 0x1F);
+  uint32 hiblock = ((EXPREGS[0] & 8) << 4)|((EXPREGS[0] & 0x80) << 1)|(UNIFchrrama?((EXPREGS[2] & 0x40)<<3):0);
+  uint32 block = (EXPREGS[1] & 0x60) | hiblock;
+  uint32 extra = (EXPREGS[3] & 2);
+
   if((EXPREGS[0]&7)==4)
     setprg32(0x8000,EXPREGS[1]>>1);
   else if ((EXPREGS[0]&7)==3)
@@ -86,7 +102,7 @@ static void BMCFK23CPW(uint32 A, uint8 V)
   { 
     if(EXPREGS[0]&3)
 		{
-			uint32 blocksize = (6+prg_bonus)-(EXPREGS[0]&3);
+			uint32 blocksize = (6)-(EXPREGS[0]&3);
 			uint32 mask = (1<<blocksize)-1;
 			V &= mask;
 			//V &= 63; //? is this a good idea?
@@ -102,32 +118,42 @@ static void BMCFK23CPW(uint32 A, uint8 V)
       setprg8(0xE000,EXPREGS[5]);
     }
   }
+	setprg8r(0x10,0x6000,A001B&3);
 }
 
 //PRG handler ($8000-$FFFF)
 static DECLFW(BMCFK23CHiWrite)
 {
-  if(EXPREGS[0]&0x40)
-  {
-    if(EXPREGS[0]&0x30)
-      unromchr=0;
+	if(EXPREGS[0]&0x40)
+	{
+		if(EXPREGS[0]&0x30)
+			unromchr=0;
+		else
+		{
+			unromchr=V&3;
+			FixMMC3CHR(MMC3_cmd);
+		}
+	}
+	else
+	{
+		if((A==0x8001)&&(EXPREGS[3]&2&&MMC3_cmd&8))
+		{
+			EXPREGS[4|(MMC3_cmd&3)]=V;
+			FixMMC3PRG(MMC3_cmd);
+			FixMMC3CHR(MMC3_cmd);
+		}
     else
-    {
-      unromchr=V&3;
-      FixMMC3CHR(MMC3_cmd);
-    }
-  }
-  else
-  {
-    if((A==0x8001)&&(EXPREGS[3]&2&&MMC3_cmd&8))
-    {
-      EXPREGS[4|(MMC3_cmd&3)]=V;
-      FixMMC3PRG(MMC3_cmd);
-      FixMMC3CHR(MMC3_cmd);
-    }
-    else    
-      if(A<0xC000)
+      if(A<0xC000) {
+        if(UNIFchrrama) { // hacky... strange behaviour, must be bit scramble due to pcb layot restrictions
+                          // check if it not interfer with other dumps
+          if((A==0x8000)&&(V==0x46))
+            V=0x47;
+          else if((A==0x8000)&&(V==0x47))
+            V=0x46;
+        }
         MMC3_CMDWrite(A,V);
+        FixMMC3PRG(MMC3_cmd);
+      }
       else
         MMC3_IRQWrite(A,V);
   }
@@ -159,19 +185,25 @@ static DECLFW(BMCFK23CWrite)
 			FixMMC3PRG(MMC3_cmd);
 			FixMMC3CHR(MMC3_cmd);
 		}
-  } 
-	//else printf("- ");
-	//printf("%04X = $%02X\n",A,V);
+  }
 
+	if(is_BMCFK23CA)
+	{
+		if(EXPREGS[3]&2)
+			EXPREGS[0] &= ~7;   // hacky hacky! if someone wants extra banking, then for sure doesn't want mode 4 for it! (allow to run A version boards on normal mapper)
+	}
+
+	//printf("%04X = $%02X\n",A,V);
 	//printf("%02X %02X %02X %02X\n",EXPREGS[0],EXPREGS[1],EXPREGS[2],EXPREGS[3]);
 }
 
 static void BMCFK23CReset(void)
 {
+	//NOT NECESSARY ANYMORE
 	//this little hack makes sure that we try all the dip switch settings eventually, if we reset enough
-  dipswitch++;
-  dipswitch&=7;
-	printf("BMCFK23C dipswitch set to %d\n",dipswitch);
+	// dipswitch++;
+	// dipswitch&=7;
+	//printf("BMCFK23C dipswitch set to %d\n",dipswitch);
 
   EXPREGS[0]=EXPREGS[1]=EXPREGS[2]=EXPREGS[3]=0;
   EXPREGS[4]=EXPREGS[5]=EXPREGS[6]=EXPREGS[7]=0xFF;
@@ -191,11 +223,31 @@ static void BMCFK23CPower(void)
   SetWriteHandler(0x8000,0xFFFF,BMCFK23CHiWrite);
   FixMMC3PRG(MMC3_cmd);
   FixMMC3CHR(MMC3_cmd);
+}
 
+static void BMCFK23CAPower(void)
+{
+  GenMMC3Power();
+  dipswitch = 0;
+  EXPREGS[0]=EXPREGS[1]=EXPREGS[2]=EXPREGS[3]=0;
+  EXPREGS[4]=EXPREGS[5]=EXPREGS[6]=EXPREGS[7]=0xFF;
+  SetWriteHandler(0x5000,0x5fff,BMCFK23CWrite);
+  SetWriteHandler(0x8000,0xFFFF,BMCFK23CHiWrite);
+  FixMMC3PRG(MMC3_cmd);
+  FixMMC3CHR(MMC3_cmd);
+}
+
+static void BMCFK23CAClose(void)
+{
+  if(CHRRAM)
+    FCEU_gfree(CHRRAM);
+  CHRRAM=NULL;
 }
 
 void BMCFK23C_Init(CartInfo *info)
 {
+	is_BMCFK23CA = false;
+
   GenMMC3_Init(info, 512, 256, 8, 0);
   cwrap=BMCFK23CCW;
   pwrap=BMCFK23CPW;
@@ -211,3 +263,29 @@ void BMCFK23C_Init(CartInfo *info)
 
 	prg_mask = 0x7F>>(prg_bonus);
 }
+
+void BMCFK23CA_Init(CartInfo *info)
+{
+	is_BMCFK23CA = true;
+
+  GenMMC3_Init(info, 512, 256, 8, 0);
+  cwrap=BMCFK23CCW;
+  pwrap=BMCFK23CPW;
+  info->Power=BMCFK23CAPower;
+  info->Reset=BMCFK23CReset;
+  info->Close=BMCFK23CAClose;
+
+	CHRRAMSize=8192;
+  CHRRAM=(uint8*)FCEU_gmalloc(CHRRAMSize);
+  SetupCartCHRMapping(0x10, CHRRAM, CHRRAMSize, 1);
+  AddExState(CHRRAM, CHRRAMSize, 0, "CRAM");
+
+  AddExState(EXPREGS, 8, 0, "EXPR");
+  AddExState(&unromchr, 1, 0, "UNCHR");
+  AddExState(&dipswitch, 1, 0, "DIPSW");
+
+	prg_bonus = 1;
+	if(MasterRomInfoParams.find("bonus") != MasterRomInfoParams.end())
+		prg_bonus = atoi(MasterRomInfoParams["bonus"].c_str());
+	prg_mask = 0x7F>>(prg_bonus);
+}
diff --git a/src/boards/mmc3.h b/src/boards/mmc3.h
index 558f8c3b..a5e03cde 100644
--- a/src/boards/mmc3.h
+++ b/src/boards/mmc3.h
@@ -1,4 +1,6 @@
 extern uint8 MMC3_cmd;
+extern uint8 A000B;
+extern uint8 A001B;
 extern uint8 EXPREGS[8];
 extern uint8 DRegBuf[8];
 
diff --git a/src/unif.cpp b/src/unif.cpp
index 5308c5c9..22ee5ff1 100644
--- a/src/unif.cpp
+++ b/src/unif.cpp
@@ -313,6 +313,7 @@ static int LoadCHR(FCEUFILE *fp)
 #define BMCFLAG_FORCE4 1
 #define BMCFLAG_16KCHRR  2
 #define BMCFLAG_32KCHRR  4
+#define BMCFLAG_EXPCHRR 8
 
 static BMAPPING bmap[] = {
 
@@ -438,6 +439,9 @@ static BMAPPING bmap[] = {
 
 	{ "TEK90", Mapper90_Init,0},
 
+ { "FK23C", BMCFK23C_Init,BMCFLAG_EXPCHRR},
+ { "FK23CA", BMCFK23CA_Init,BMCFLAG_EXPCHRR},
+
 	{0,0,0}
 };
 
@@ -501,10 +505,14 @@ static int InitializeBoard(void)
 		{
 			if(!malloced[16])
 			{
-				if(bmap[x].flags & BMCFLAG_16KCHRR)
-					CHRRAMSize = 16384;
-				else
-					CHRRAMSize = 8192;
+      if(bmap[x].flags & BMCFLAG_16KCHRR)
+        CHRRAMSize = 16384;
+      else if(bmap[x].flags & BMCFLAG_32KCHRR)
+        CHRRAMSize = 32768;
+      else if(bmap[x].flags & BMCFLAG_EXPCHRR)
+        CHRRAMSize = 128 * 1024;
+      else
+        CHRRAMSize = 8192;
 				if((UNIFchrrama=(uint8 *)FCEU_malloc(CHRRAMSize)))
 				{
 					SetupCartCHRMapping(0,UNIFchrrama,CHRRAMSize,1);
diff --git a/src/unif.h b/src/unif.h
index 46c884b8..159ec38e 100644
--- a/src/unif.h
+++ b/src/unif.h
@@ -89,6 +89,7 @@ void BMC70in1B_Init(CartInfo *info);
 void BMC13in1JY110_Init(CartInfo *info);
 void BMCT262_Init(CartInfo *info);
 void BMCFK23C_Init(CartInfo *info);
+void BMCFK23CA_Init(CartInfo *info);
 void BMCD1038_Init(CartInfo *info);
 void BMCA65AS_Init(CartInfo *info);
 void BMCGK192_Init(CartInfo *info);
diff --git a/vc/vc8_fceux.vcproj b/vc/vc8_fceux.vcproj
index 52df6507..f12e1792 100644
--- a/vc/vc8_fceux.vcproj
+++ b/vc/vc8_fceux.vcproj
@@ -592,6 +592,14 @@
 			<File
 				RelativePath="..\src\mappers\156.cpp"
 				>
+				<FileConfiguration
+					Name="Release Fastbuild|Win32"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+						WarningLevel="4"
+					/>
+				</FileConfiguration>
 			</File>
 			<File
 				RelativePath="..\src\boards\164.cpp"