diff --git a/src/boards/280.c b/src/boards/280.c
new file mode 100644
index 0000000..07deac1
--- /dev/null
+++ b/src/boards/280.c
@@ -0,0 +1,83 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ * Copyright (C) 2025 NewRisingSun
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include "mapinc.h"
+
+static uint16 latchAddr;
+static uint8  latchData;
+static uint8  mode;
+
+static SFORMAT StateRegs[] = {
+   { &latchAddr, 2 | FCEUSTATE_RLSB, "LATC" },
+   { &latchData, 1, "DATA" },
+   { &mode, 1, "MODE" },
+   { 0 }
+};
+
+static void Sync(void) {
+   if (mode &1) {
+      setprg16(0x8000, 0x20 | latchData &0x07);
+      setprg16(0xC000, 0x27);
+   } else {
+      if (latchAddr &0x01)
+	      setprg32(0x8000, latchAddr >>3 &0x0F);
+      else {
+	      setprg16(0x8000, latchAddr >>2 &0x1F);
+	      setprg16(0xC000, latchAddr >>2 &0x1F);
+      }
+      if (~latchAddr &0x80) setprg16(0xC000, 0);
+   }
+   SetupCartCHRMapping(0, CHRptr[0], 0x2000, ~mode &0x01 && latchAddr &0x80? 0: 1);
+   setchr8(0);
+   setmirror(latchAddr &0x02? MI_H: MI_V);
+}
+
+static DECLFW(M280Write) {
+   latchAddr =A;
+   latchData =V;
+   Sync();
+}
+
+static void M280Reset(void) {
+   mode ^=1;
+   latchAddr = 0;
+   latchData = 0;
+   Sync();
+}
+
+static void M280Power(void) {
+   mode =0;
+   latchAddr = 0;
+   latchData = 0;
+   Sync();
+   SetReadHandler(0x8000, 0xFFFF, CartBR);
+   SetWriteHandler(0x8000, 0xFFFF, M280Write);
+}
+
+static void StateRestore(int version) {
+   Sync();
+}
+
+void Mapper280_Init(CartInfo *info) {
+   info->Power = M280Power;
+   info->Reset = M280Reset;
+   GameStateRestore = StateRestore;
+   AddExState(&StateRegs, ~0, 0, 0);
+}
diff --git a/src/ines.c b/src/ines.c
index cb8596b..432254f 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -698,6 +698,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "Akumajō Special: Boku Dracula-kun", 272, Mapper272_Init         )
 	INES_BOARD( "80013-B",                  274, BMC80013B_Init         )
 	INES_BOARD( "",                         277, Mapper277_Init         )
+	INES_BOARD( "K-3017",                   280, Mapper280_Init         )
 	INES_BOARD( "YY860417C",                281, Mapper281_Init         )
 	INES_BOARD( "860224C",                  282, Mapper282_Init         )
 	INES_BOARD( "GS-2004/GS-2013",          283, Mapper283_Init         )
diff --git a/src/ines.h b/src/ines.h
index c773541..8121042 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -253,6 +253,7 @@ void GN45_Init(CartInfo *info); /* m361, m366 */
 void Mapper270_Init(CartInfo *);
 void Mapper272_Init(CartInfo *);
 void Mapper277_Init(CartInfo *);
+void Mapper280_Init(CartInfo *);
 void Mapper281_Init(CartInfo *);
 void Mapper282_Init(CartInfo *);
 void Mapper283_Init(CartInfo *);