diff --git a/src/boards/225.c b/src/boards/225.c
index a00b9fd..ae384ed 100644
--- a/src/boards/225.c
+++ b/src/boards/225.c
@@ -31,6 +31,7 @@
 #include "mapinc.h"
 
 static uint8 extraRAM[4], prg, mode, chr, mirr;
+static uint8 is255;
 
 static SFORMAT StateRegs[] =
 {
@@ -56,7 +57,10 @@ static DECLFW(M225Write) {
 	uint8 bank = (A >> 14) & 1;
 	mirr = (A >> 13) & 1;
 	mode = (A >> 12) & 1;
-	chr = (A & 0x3f) | (bank << 6);
+	if (is255)
+		chr = (V & 0x03) | (A & 0x3C) | (bank << 6);
+	else
+		chr = (A & 0x3f) | (bank << 6);
 	prg = ((A >> 6) & 0x3f) | (bank << 6);
 	Sync();
 }
@@ -92,12 +96,14 @@ static void StateRestore(int version) {
 }
 
 void Mapper225_Init(CartInfo *info) {
+	is255 = 0;
 	info->Reset = M225Reset;
 	info->Power = M225Power;
 	GameStateRestore = StateRestore;
 	AddExState(&StateRegs, ~0, 0, 0);
 }
 
-void Mapper255_Init(CartInfo *info) {
+void Mapper255_Init(CartInfo *info) {	
 	Mapper225_Init(info);
-}
\ No newline at end of file
+	is255 = 1;
+}
diff --git a/src/ines.c b/src/ines.c
index dd417a0..07505f6 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -708,7 +708,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "SAN GUO ZHI PIRATE",       252, Mapper252_Init         )
 	INES_BOARD( "DRAGON BALL PIRATE",       253, Mapper253_Init         )
 	INES_BOARD( "",                         254, Mapper254_Init         )
-	INES_BOARD( "",                         255, Mapper255_Init         ) /* Duplicate of M225? */
+	INES_BOARD( "",                         255, Mapper255_Init         ) /* Variant of M225 */
 
 	/* NES 2.0 MAPPERS */