diff --git a/src/boards/AbG1l.c b/src/boards/428.c
similarity index 50%
rename from src/boards/AbG1l.c
rename to src/boards/428.c
index 7fde82b..06f18f7 100644
--- a/src/boards/AbG1l.c
+++ b/src/boards/428.c
@@ -25,7 +25,6 @@
 
 static uint8 regs[4];
 static uint8 hrd_flag;
-static void(*Sync)(void);
 
 static SFORMAT StateRegs[] =
 {
@@ -34,7 +33,8 @@ static SFORMAT StateRegs[] =
 	{ 0 }
 };
 
-static void SyncAbG1l(void) {
+static void Sync(void) {
+	int mask = regs[2] >> 6; /* There is an CNROM mode that takes either two or four inner CHR banks from a CNROM-like latch register at $8000-$FFFF. */
 
 	if (regs[1] & 0x10)
 		setprg32(0x8000,(regs[1] & 0xC0) >> 6);
@@ -44,48 +44,36 @@ static void SyncAbG1l(void) {
 		setprg16(0xC000, (regs[1] & 0xE0) >> 5);
 	}
 
-	/* FIXME: 2020-10-26  */
-	switch (regs[2] & 0xC0) {
-	case 0xC0: /* Pipe Dream */
-		setchr8((regs[0] & 0x03) | (regs[1] & ~0x03));
-		break;
-	case 0x40: /* Goonies */
-		setchr8((regs[0] & 0x01) | (regs[1] & 0x07));
-		break;
-	default:
-		setchr8(regs[1]);
-		break;
-	}
-
+	setchr8(((regs[1] & 0x07) & ~mask) | regs[0] & mask);
+	
 	setmirror((regs[1] & 0x8) ? 0 : 1);
 }
 
-static DECLFW(AbG1lWriteHi) {
+static DECLFW(WriteHi) {
 	regs[0] = V;
-	/* setchr8(((regs[2] & 0xC0) >> 7) << 2 | (regs[0] & 0x03)); */
 	Sync();
 }
 
-static DECLFW(AbG1lWriteLo) {
+static DECLFW(WriteLo) {
 	regs[A & 0x03] = V;
 	Sync();
 }
 
-static DECLFR(AbG1lReadLo) {
+static DECLFR(ReadLo) {
 	return hrd_flag;
 }
 
-static void AbG1lPower(void) {
-	hrd_flag = 0;
+static void Power(void) {
+	hrd_flag = 0; /* Solder pad, selecting different menus */
 
 	regs[0] = 0;
 	regs[1] = 0;
 	regs[2] = 0;
 
 	Sync();
-	SetWriteHandler(0x8000, 0xFFFF, AbG1lWriteHi);
-	SetWriteHandler(0x6001, 0x6002, AbG1lWriteLo);
-	SetReadHandler(0x6000, 0x7FFF, AbG1lReadLo);
+	SetWriteHandler(0x8000, 0xFFFF, WriteHi);
+	SetWriteHandler(0x6001, 0x6002, WriteLo);
+	SetReadHandler(0x6000, 0x7FFF, ReadLo);
 	SetReadHandler(0x8000, 0xFFFF, CartBR);
 }
 
@@ -93,7 +81,7 @@ static void StateRestore(int version) {
 	Sync();
 }
 
-static void AbG1lReset(void) {
+static void Reset(void) {
 	hrd_flag++;
 	hrd_flag &= 3;
 	
@@ -104,64 +92,14 @@ static void AbG1lReset(void) {
 	Sync();
 }
 
-void AbG1l_Init(CartInfo *info) {
-
-	Sync = SyncAbG1l;
-
+void Mapper428_Init(CartInfo *info) {
 	hrd_flag = 0;
 
 	Sync();
 
-	info->Power = AbG1lPower;
-	info->Reset = AbG1lReset;
+	info->Power = Power;
+	info->Reset = Reset;
 	AddExState(&StateRegs, ~0, 0, 0);
 	GameStateRestore = StateRestore;
 }
 
-
-static void SyncWellNoDG450(void) {
-
-	if (regs[1] & 0x10)
-		setprg32(0x8000, (regs[1]) >> 6);
-	else
-	{
-		setprg16(0x8000, (regs[1]) >> 5);
-		setprg16(0xC000, (regs[1]) >> 5);
-	}
-
-	setchr8(regs[1] & 0x0F);
-	setmirror((regs[1] & 0x8) ? 0 : 1);
-}
-
-static void WellNoDG450Power(void) {
-	hrd_flag = 0;
-
-	regs[0] = 0;
-	regs[1] = 0;
-	regs[2] = 0;
-
-	Sync();
-
-	SetWriteHandler(0x6001, 0x6002, AbG1lWriteLo);
-	SetReadHandler(0x6000, 0x7FFF, AbG1lReadLo);
-	SetReadHandler(0x8000, 0xFFFF, CartBR);
-}
-
-static void WellNoDG450Reset(void) {
-	hrd_flag++;
-	hrd_flag &= 3;
-
-	regs[0] = 0;
-	regs[1] = 0;
-	regs[2] = 0;
-
-	Sync();
-}
-
-void WellNoDG450_Init(CartInfo *info) {
-	Sync = SyncWellNoDG450;
-	info->Power = WellNoDG450Power;
-	info->Reset = WellNoDG450Reset;
-	AddExState(&StateRegs, ~0, 0, 0);
-	GameStateRestore = StateRestore;
-}
diff --git a/src/ines.c b/src/ines.c
index 33cbed2..ce9e8b3 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -788,6 +788,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "YY850439C",                397, Mapper397_Init         )
 	INES_BOARD( "831019C J-2282",           402, J2282_Init             )
 	INES_BOARD( "SC871115C",                421, Mapper421_Init         )
+	INES_BOARD( "AB-G1L/WELL-NO-DG450",     428, Mapper428_Init         )
 	INES_BOARD( "SA-9602B",                 513, SA9602B_Init           )
 	INES_BOARD( "DANCE2000",                518, UNLD2000_Init          )
 	INES_BOARD( "EH8813A",                  519, UNLEH8813A_Init        )
diff --git a/src/ines.h b/src/ines.h
index cbeaf42..ad0556e 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -282,6 +282,7 @@ void Mapper401_Init(CartInfo *);
 void Mapper411_Init(CartInfo *);
 void Mapper421_Init(CartInfo *);
 void Mapper422_Init(CartInfo *);
+void Mapper428_Init(CartInfo *);
 void Mapper516_Init(CartInfo *);
 void Mapper533_Init(CartInfo *);
 void Mapper534_Init(CartInfo *);
diff --git a/src/unif.c b/src/unif.c
index 14c3f60..e69a75a 100644
--- a/src/unif.c
+++ b/src/unif.c
@@ -438,7 +438,7 @@ static BMAPPING bmap[] = {
 	{ "8237A",                      215, UNL8237A_Init,         0 },
 	{ "830118C",                    348, BMC830118C_Init,       0 },
 	{ "A65AS",                      285, BMCA65AS_Init,         0 },
-	{ "AB-G1L",                 NO_INES, AbG1l_Init,            0 },
+	{ "AB-G1L",                     428, Mapper428_Init,        0 },
 	{ "AC08",                        42, AC08_Init,             0 },
 	{ "ANROM",                        7, ANROM_Init,            0 },
 	{ "AX5705",                     530, UNLAX5705_Init,        0 },
@@ -559,7 +559,8 @@ static BMAPPING bmap[] = {
 	{ "UNROM-512-32",                30, UNROM512_Init,         BMCFLAG_32KCHRR },
 	{ "UOROM",                        2, UNROM_Init,            0 },
 	{ "VRC7",                        85, UNLVRC7_Init,          0 },
-	{ "WELL-NO-DG450",          NO_INES, WellNoDG450_Init,      0 },
+	{ "WELL-NO-DG450",              428, Mapper428_Init,        0 },
+	{ "TF2740",                     428, Mapper428_Init,        0 },	
 	{ "YOKO",                       264, UNLYOKO_Init,          0 },
 	{ "COOLBOY",                    268, COOLBOY_Init,          BMCFLAG_256KCHRR },
 	{ "158B",                       258, UNL158B_Init,          0 },
diff --git a/src/unif.h b/src/unif.h
index 4f5517e..c53a3e8 100644
--- a/src/unif.h
+++ b/src/unif.h
@@ -189,8 +189,6 @@ void BMC830134C_Init(CartInfo *info);		/* m315 */
 void BMCGN26_Init(CartInfo *info);			/* m344 */
 
 void BS110_Init(CartInfo *info);
-void WellNoDG450_Init(CartInfo *info);
-void AbG1l_Init(CartInfo *info);
 void KG256_Init(CartInfo *info);
 void WAIXINGFS005_Init(CartInfo *info);