diff --git a/src/boards/addrlatch.c b/src/boards/addrlatch.c
index dda64dd..836e7a8 100644
--- a/src/boards/addrlatch.c
+++ b/src/boards/addrlatch.c
@@ -757,3 +757,21 @@ static void M435Sync(void) {
 void Mapper435_Init(CartInfo *info) {
 	Latch_Init(info, M435Sync, NULL, 0x0000, 0x8000, 0xFFFF, 1);
 }
+
+/*------------------ Map 464 ---------------------------*/
+static void M464Sync(void) {
+	int p =latche >>7;
+	int c =latche &0x1F;
+	if (latche &0x40) {
+		setprg32(0x8000, p >> 1);
+	} else {
+		setprg16(0x8000, p);
+		setprg16(0xC000, p);
+	}
+	setchr8(c);
+	setmirror(latche &0x20? MI_H: MI_V);
+}
+
+void Mapper464_Init(CartInfo *info) {
+	Latch_Init(info, M464Sync, NULL, 0x0000, 0x8000, 0xFFFF, 1);
+}
diff --git a/src/ines.c b/src/ines.c
index 1d7f0b2..ce3791e 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -821,6 +821,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "DS-9-27",                  452, Mapper452_Init         )
 	INES_BOARD( "K6C3001A",                 456, Mapper456_Init         )
 	INES_BOARD( "YH810X1",                 	463, Mapper463_Init         )
+	INES_BOARD( "NTDEC 9012",          	464, Mapper464_Init         )
 	INES_BOARD( "Keybyte Computer",        	466, Mapper466_Init         )
 	INES_BOARD( "47-2",                 	467, Mapper467_Init         )
 	INES_BOARD( "SA-9602B",                 513, SA9602B_Init           )
diff --git a/src/ines.h b/src/ines.h
index 8a6d505..2a489cf 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -329,6 +329,7 @@ void Mapper444_Init(CartInfo *);
 void Mapper452_Init(CartInfo *);
 void Mapper456_Init(CartInfo *);
 void Mapper463_Init(CartInfo *);
+void Mapper464_Init(CartInfo *);
 void Mapper466_Init(CartInfo *);
 void Mapper467_Init(CartInfo *);
 void Mapper516_Init(CartInfo *);