diff --git a/src/drivers/libretro/fceu/unif.c b/src/drivers/libretro/fceu/unif.c
index 3b40c28..26f79a3 100644
--- a/src/drivers/libretro/fceu/unif.c
+++ b/src/drivers/libretro/fceu/unif.c
@@ -309,11 +309,11 @@ static int LoadCHR(FCEUFILE *fp) {
 	return(1);
 }
 
-#define BMCFLAG_FORCE4 1
-#define BMCFLAG_16KCHRR  2
-#define BMCFLAG_32KCHRR  4
-#define BMCFLAG_128KCHRR 8
-#define BMCFLAG_EXPCHRR  10
+#define BMCFLAG_FORCE4    0x01
+#define BMCFLAG_16KCHRR   0x02
+#define BMCFLAG_32KCHRR   0x04
+#define BMCFLAG_128KCHRR  0x08
+#define BMCFLAG_256KCHRR  0x10
 
 static BMAPPING bmap[] = {
 	{ "11160", BMC11160_Init, 0 },
@@ -353,8 +353,8 @@ static BMAPPING bmap[] = {
 	{ "ELROM", ELROM_Init, 0 },
 	{ "ETROM", ETROM_Init, 0 },
 	{ "EWROM", EWROM_Init, 0 },
-	{ "FK23C", BMCFK23C_Init, BMCFLAG_EXPCHRR },
-	{ "FK23CA", BMCFK23CA_Init, BMCFLAG_EXPCHRR },
+        { "FK23C", BMCFK23C_Init, BMCFLAG_256KCHRR },
+	{ "FK23CA", BMCFK23CA_Init, BMCFLAG_256KCHRR },
 	{ "FS304", UNLFS304_Init, 0 },
 	{ "G-146", BMCG146_Init, 0 },
 	{ "GK-192", BMCGK192_Init, 0 },
@@ -449,7 +449,8 @@ static BMAPPING bmap[] = {
 	{ "UOROM", UNROM_Init, 0 },
 	{ "VRC7", UNLVRC7_Init, 0 },
 	{ "YOKO", UNLYOKO_Init, 0 },
-   { "COOLBOY", COOLBOY_Init, BMCFLAG_128KCHRR },
+        { "COOLBOY", COOLBOY_Init, BMCFLAG_256KCHRR },
+        { "158B", UNL158B_Init, 0 },
 
 #ifdef COPYFAMI
 	{ "COPYFAMI_MMC3", MapperCopyFamiMMC3_Init, 0 },
@@ -514,12 +515,12 @@ static int InitializeBoard(void) {
 				else if (bmap[x].flags & BMCFLAG_32KCHRR)
 					CHRRAMSize = 32;
 				else if (bmap[x].flags & BMCFLAG_128KCHRR)
-               CHRRAMSize = 128;
-				else if (bmap[x].flags & BMCFLAG_EXPCHRR)
+					CHRRAMSize = 128;
+				else if (bmap[x].flags & BMCFLAG_256KCHRR)
 					CHRRAMSize = 256;
 				else
 					CHRRAMSize = 8;
-            CHRRAMSize <<= 10;
+                CHRRAMSize <<= 10;
 				if ((UNIFchrrama = (uint8*)FCEU_malloc(CHRRAMSize))) {
 					SetupCartCHRMapping(0, UNIFchrrama, CHRRAMSize, 1);
 					AddExState(UNIFchrrama, CHRRAMSize, 0, "CHRR");