diff --git a/src/boards/addrlatch.c b/src/boards/addrlatch.c
index a1d1dfd..9aa62ed 100644
--- a/src/boards/addrlatch.c
+++ b/src/boards/addrlatch.c
@@ -472,6 +472,36 @@ void Mapper242_Init(CartInfo *info) {
 	Latch_Init(info, M242Sync, NULL, 0x0000, 0x8000, 0xFFFF, 1);
 }
 
+/*------------------ Map 288 ---------------------------*/
+/* NES 2.0 Mapper 288 is used for two GKCX1 21-in-1 multicarts
+ * - 21-in-1 (GA-003)
+ * - 64-in-1 (CF-015)
+ */
+static void M288Sync(void) {
+	setchr8(latche & 7);
+	setprg32(0x8000, (latche >> 3) & 3);
+}
+
+static DECLFR(M288Read) {
+	uint8 ret = CartBR(A);
+	if (latche & 0x20)
+		ret |= (dipswitch << 2);
+	return ret;
+}
+
+static void M288Reset(void) {
+	dipswitch++;
+	dipswitch &= 3;
+	M288Sync();
+}
+
+void Mapper288_Init(CartInfo *info) {
+	dipswitch = 0;
+	Latch_Init(info, M288Sync, M288Read, 0x0000, 0x8000, 0xFFFF, 0);
+	info->Reset = M288Reset;
+	AddExState(&dipswitch, 1, 0, "DIPSW");
+}
+
 /*------------------ Map 541 ---------------------------*/
 /* LittleCom 160-in-1 multicart */
 static void M541Sync(void) {
diff --git a/src/ines.c b/src/ines.c
index e9f058d..0866d2b 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -660,6 +660,7 @@ static BMAPPINGLocal bmap[] = {
 	{(uint8_t*)"HUMMER/JY-052",			281, Mapper281_Init},
 	{(uint8_t*)"GN-45",					366, GN45_Init},
 	
+	{(uint8_t*)"GKCX1",					288, Mapper288_Init },
 	{(uint8_t*)"Bit Corp 4-in-1",		357, Mapper357_Init },
 	{(uint8_t*)"MMC3 PIRATE SFC-12",	372, Mapper372_Init },
 	{(uint8_t*)"KN-42",					381, Mapper381_Init },
diff --git a/src/ines.h b/src/ines.h
index 2047761..ad42db6 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -243,6 +243,7 @@ void Bs5652_Init(CartInfo *);
 void NC7000M_Init(CartInfo *);
 void J2282_Init(CartInfo *);
 
+void Mapper288_Init(CartInfo *);
 void Mapper357_Init(CartInfo *);
 void Mapper372_Init(CartInfo *);
 void Mapper381_Init(CartInfo *);