diff --git a/src/boards/448.c b/src/boards/448.c
new file mode 100644
index 0000000..7e73fbe
--- /dev/null
+++ b/src/boards/448.c
@@ -0,0 +1,161 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2023
+ *
+ * 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
+ */
+
+/* NES 2.0 Mapper 448
+ * VRC4-based 830768C multicart circuit board used by a Super 6-in-1 multicart.
+ */
+
+#include "mapinc.h"
+#include "latch.h"
+
+static uint8 reg;
+static uint8 vrc4Prg;
+static uint8 vrc4Mirr;
+static uint8 vrc4Misc;
+static uint8 vrc4IRQLatch;
+static uint8 vrc4IRQa;
+static uint8 vrc4IRQCount;
+static int16 vrc4IRQCycles;
+
+static SFORMAT StateRegs[] = {
+	{ &reg,           1, "REGS" },
+	{ &vrc4Prg,       1, "PREG" },
+	{ &vrc4Mirr,      1, "V4MI" },
+	{ &vrc4Misc,      1, "V4MS" },
+	{ &vrc4IRQLatch,  1, "VILA" },
+	{ &vrc4IRQa,      1, "VIMO" },
+	{ &vrc4IRQCount,  1, "VICO" },
+	{ &vrc4IRQCycles, 2, "VICY" },
+	{ 0 },
+};
+
+static void Sync(void) {
+	setchr8(0);
+	if (reg & 0x08) { /* AOROM */
+		setprg32(0x8000, ((reg << 2) & ~0x07) | (latch.data & 0x07));
+		setmirror(MI_0 + ((latch.data >> 4) & 0x01));
+	} else {
+		if (reg & 0x04) { /* UOROM */
+			setprg16(0x8000, ((reg << 3) & ~0x0F) | (vrc4Prg & 0x0F));
+			setprg16(0xC000, ((reg << 3) & ~0x0F) | 0x0F);
+		} else { /* UNROM */
+			setprg16(0x8000, (reg << 3) | (vrc4Prg & 0x07));
+			setprg16(0xC000, (reg << 3) | 0x07);
+		}
+		switch (vrc4Mirr & 0x03) {
+		case 0: setmirror(MI_V); break;
+		case 1: setmirror(MI_H); break;
+		case 2: setmirror(MI_0); break;
+		case 3: setmirror(MI_1); break;
+		}
+	}
+}
+
+static DECLFW(writeVRC4) {
+	if (A < 0x9000) {
+		vrc4Prg = V;
+		Sync();
+	} else {
+		switch (A & 0xF000 | ((A >> 2) & 3)) {		
+		case 0x9000:
+			vrc4Mirr = V;
+			Sync();
+			break;
+		case 0x9002:
+			vrc4Misc = V;
+			break;
+		case 0xF000:
+			vrc4IRQLatch = (vrc4IRQLatch & 0xF0) | (V & 0x0F);
+			break;
+		case 0xF001:
+			vrc4IRQLatch = (vrc4IRQLatch & 0x0F) | (V << 4);
+			break;
+		case 0xF002:
+			vrc4IRQa = V;
+			if (vrc4IRQa & 0x02) {
+				vrc4IRQCount = vrc4IRQLatch;
+				vrc4IRQCycles = 341;
+			}
+			X6502_IRQEnd(FCEU_IQEXT);
+			break;
+		case 0xF003:
+			vrc4IRQa = (vrc4IRQa & ~0x02) | ((vrc4IRQa << 1) & 0x02);
+			X6502_IRQEnd(FCEU_IQEXT);
+			break;
+		}
+	}
+}
+
+static DECLFW(M448WriteReg) {
+	if (vrc4Misc & 1) {
+		reg = A & 0xFF;
+		Sync();
+	}
+}
+
+static DECLFW(M448Write) {
+	LatchWrite(A, V);
+    writeVRC4(A, V);
+}
+
+static void FP_FASTAPASS(1) M448CPUHook(int a) {
+	int count = a;
+	while (count--) {
+		if ((vrc4IRQa & 0x02) && ((vrc4IRQa & 0x04) || ((vrc4IRQCycles -= 3) <= 0))) {
+			if (~vrc4IRQa & 0x04) {
+				vrc4IRQCycles += 341;
+			}
+			if (!++vrc4IRQCount) {
+				vrc4IRQCount = vrc4IRQLatch;
+				X6502_IRQBegin(FCEU_IQEXT);
+			}
+		}
+	}
+}
+
+static void M448Reset(void) {
+	reg = 0;
+	Sync();
+}
+
+static void M448Power(void) {
+	reg = 0;
+	vrc4Prg = 0;
+	vrc4Mirr = vrc4Misc = 0;
+	vrc4IRQLatch = vrc4IRQa = vrc4IRQCount = vrc4IRQCycles = 0;
+	LatchPower();
+
+	SetReadHandler(0x8000, 0xFFFF, CartBR);
+	SetWriteHandler(0x6000, 0x7FFF, M448WriteReg);
+	SetWriteHandler(0x8000, 0xFFFF, M448Write);
+}
+
+static void StateRestore(int version) {
+	Sync();
+}
+
+void Mapper448_Init(CartInfo *info) {
+	Latch_Init(info, Sync, NULL, 0, 0);
+	info->Reset = M448Reset;
+	info->Power = M448Power;
+	MapIRQHook = M448CPUHook;
+	GameStateRestore = StateRestore;
+	AddExState(StateRegs, ~0, 0, 0);
+}
diff --git a/src/boards/556.c b/src/boards/556.c
new file mode 100644
index 0000000..04fa6b3
--- /dev/null
+++ b/src/boards/556.c
@@ -0,0 +1,330 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2023
+ *
+ * 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
+ */
+
+/* NES 2.0 Mapper 556
+ * Used for the for the 超强小新2+瑪莉家族 7-in-1 (JY-215) multicart.
+ */
+
+#include "mapinc.h"
+
+static uint8 reg[5];
+static uint8 mmc3Reg[8];
+static uint8 mmc3Cmd;
+static uint8 mmc3Mirr;
+static uint8 mmc3Wram;
+static uint8 mmc3IRQLatch;
+static uint8 mmc3IRQCount;
+static uint8 mmc3IRQa;
+static uint8 mmc3IRQReload;
+static uint8 vrc4Prg[2];
+static uint8 vrc4Mirr;
+static uint8 vrc4Misc;
+static uint16 vrc4Chr[8];
+static uint8 vrc4IRQLatch;
+static uint8 vrc4IRQa;
+static uint8 vrc4IRQCount;
+static int16 vrc4IRQCycles;
+static uint8 *WRAM = NULL;
+static uint32 WRAMSIZE = 0;
+
+static SFORMAT StateRegs[] = {
+	{ reg,            5, "REGS" },
+	{ mmc3Reg,        8, "MMC3" },
+	{ &mmc3Cmd,       1, "M3IX" },
+	{ &mmc3Mirr,      1, "M3MI" },
+	{ &mmc3Wram,      1, "M3WR" },
+	{ &mmc3IRQLatch,  1, "M3RL" },
+	{ &mmc3IRQCount,  1, "M3CN" },
+	{ &mmc3IRQa,      1, "M3IQ" },
+	{ &mmc3IRQReload, 1, "M3IR" },
+	{ vrc4Prg,        2, "V4PR" },
+	{ &vrc4Mirr,      1, "V4MI" },
+	{ &vrc4Misc,      1, "V4MS" },
+	{ vrc4Chr,       16, "V4CH" },
+	{ &vrc4IRQLatch,  1, "VILA" },
+	{ &vrc4IRQa,      1, "VIMO" },
+	{ &vrc4IRQCount,  1, "VICO" },
+	{ &vrc4IRQCycles, 2, "VICY" },
+	{ 0 },
+};
+
+static void Sync(void) {
+	uint32 prgmask = ~reg[3] & 0x3F;
+	uint32 prgbase = ((reg[3] & 0x40) << 2) | reg[1];
+	uint32 chrmask = 0xFF >> (~reg[2] & 0x0F);
+	uint32 chrbase = ((reg[3] & 0x40) << 6) | ((reg[2] & 0xF0) << 4) | reg[0];
+	uint32 cbase = 0; /* prg/chr bank flip flag */
+
+	if (~reg[2] & 0x80) {
+		/* MMC3 */
+		cbase = (mmc3Cmd << 8) & 0x4000;
+		setprg8(0x8000 ^ cbase, (prgbase & ~prgmask) | (mmc3Reg[6] & prgmask));
+		setprg8(0xA000,         (prgbase & ~prgmask) | (mmc3Reg[7] & prgmask));
+		setprg8(0xC000 ^ cbase, (prgbase & ~prgmask) | (0xFE & prgmask));
+		setprg8(0xE000,         (prgbase & ~prgmask) | (0xFF & prgmask));
+
+		cbase = (mmc3Cmd << 5) & 0x1000;
+		setchr1(0x0000 ^ cbase, (chrbase & ~chrmask) | ((mmc3Reg[0] & 0xFE) & chrmask));
+		setchr1(0x0400 ^ cbase, (chrbase & ~chrmask) | ((mmc3Reg[0] | 0x01) & chrmask));
+		setchr1(0x0800 ^ cbase, (chrbase & ~chrmask) | ((mmc3Reg[1] & 0xFE) & chrmask));
+		setchr1(0x0C00 ^ cbase, (chrbase & ~chrmask) | ((mmc3Reg[1] | 0x01) & chrmask));
+		setchr1(0x1000 ^ cbase, (chrbase & ~chrmask) | (mmc3Reg[2] & chrmask));
+		setchr1(0x1400 ^ cbase, (chrbase & ~chrmask) | (mmc3Reg[3] & chrmask));
+		setchr1(0x1800 ^ cbase, (chrbase & ~chrmask) | (mmc3Reg[4] & chrmask));
+		setchr1(0x1C00 ^ cbase, (chrbase & ~chrmask) | (mmc3Reg[5] & chrmask));
+
+		setmirror((mmc3Mirr & 0x01) ^ 1);
+	} else {
+		/* VRC4 mode */
+		cbase = (vrc4Misc << 13) & 0x4000;
+		setprg8(0x8000 ^ cbase, (prgbase & ~prgmask) | (vrc4Prg[0] & prgmask));
+		setprg8(0xA000,         (prgbase & ~prgmask) | (vrc4Prg[1] & prgmask));
+		setprg8(0xC000 ^ cbase, (prgbase & ~prgmask) | (0xFE & prgmask));
+		setprg8(0xE000,         (prgbase & ~prgmask) | (0xFF & prgmask));
+
+		setchr1(0x0000,         (chrbase & ~chrmask) | (vrc4Chr[0] & chrmask));
+		setchr1(0x0400,         (chrbase & ~chrmask) | (vrc4Chr[1] & chrmask));
+		setchr1(0x0800,         (chrbase & ~chrmask) | (vrc4Chr[2] & chrmask));
+		setchr1(0x0C00,         (chrbase & ~chrmask) | (vrc4Chr[3] & chrmask));
+		setchr1(0x1000,         (chrbase & ~chrmask) | (vrc4Chr[4] & chrmask));
+		setchr1(0x1400,         (chrbase & ~chrmask) | (vrc4Chr[5] & chrmask));
+		setchr1(0x1800,         (chrbase & ~chrmask) | (vrc4Chr[6] & chrmask));
+		setchr1(0x1C00,         (chrbase & ~chrmask) | (vrc4Chr[7] & chrmask));
+
+		switch (vrc4Mirr & 0x03) {
+		case 0: setmirror(MI_V); break;
+		case 1: setmirror(MI_H); break;
+		case 2: setmirror(MI_0); break;
+		case 3: setmirror(MI_1); break;
+		}
+	}
+}
+
+static DECLFW(writeMMC3) {
+	switch (A & 0xE001) {
+	case 0x8000:
+		mmc3Cmd = V;
+		Sync();
+		break;
+	case 0x8001:
+		mmc3Reg[mmc3Cmd & 7] = V;
+		Sync();
+		break;
+	case 0xA000:
+		mmc3Mirr = V;
+		Sync();
+		break;
+	case 0xA001:
+		mmc3Wram = V;
+		Sync();
+		break;
+	case 0xC000:
+		mmc3IRQLatch = V;
+		break;
+	case 0xC001:
+		mmc3IRQReload = 1;
+		break;
+	case 0xE000:
+		mmc3IRQa = 0;
+		X6502_IRQEnd(FCEU_IQEXT);
+		break;
+	case 0xE001:
+		mmc3IRQa = 1;
+		break;
+	}
+}
+
+static DECLFW(writeVRC4) {
+	uint8 index;
+	A = (A & 0xF000) | ((A >> 2) & 3) | (A & 3);
+	switch (A & 0xF000) {
+	case 0x8000:
+	case 0xA000:
+		vrc4Prg[(A >> 13) & 1] = V;
+		Sync();
+		break;
+	case 0x9000:
+		if (~A & 2) {
+			vrc4Mirr = V;
+		} else if (~A & 1) {
+			vrc4Misc = V;
+		}
+		Sync();
+		break;
+	case 0xF000:
+		switch (A & 3) {
+		case 0:
+			vrc4IRQLatch = (vrc4IRQLatch & 0xF0) | (V & 0x0F);
+			break;
+		case 1:
+			vrc4IRQLatch = (vrc4IRQLatch & 0x0F) | (V << 4);
+			break;
+		case 2:
+			vrc4IRQa = V;
+			if (vrc4IRQa & 0x02) {
+				vrc4IRQCount = vrc4IRQLatch;
+				vrc4IRQCycles = 341;
+			}
+			X6502_IRQEnd(FCEU_IQEXT);
+			break;
+		case 3:
+			vrc4IRQa = (vrc4IRQa & ~0x02) | ((vrc4IRQa << 1) & 0x02);
+			X6502_IRQEnd(FCEU_IQEXT);
+			break;
+		}
+		break;
+	default:
+		index = ((A - 0xB000) >> 11) | ((A >> 1) & 1);
+		if (A & 1) {
+			vrc4Chr[index] = (vrc4Chr[index] & 0x0F) | (V << 4);
+		} else {
+			vrc4Chr[index] = (vrc4Chr[index] & ~0x0F) | (V & 0x0F);
+		}
+		Sync();
+		break;
+	}
+}
+
+static DECLFW(M556WriteReg) {
+	if (~reg[3] & 0x80) {
+		reg[reg[4] & 3] = V;
+		reg[4]++;
+		Sync();
+	}
+}
+
+static DECLFW(M556Write) {
+	if (~reg[2] & 0x80) {
+		writeMMC3(A, V);
+	} else {
+		writeVRC4(A, V);
+	}
+}
+
+static void FP_FASTAPASS(1) M556CPUHook(int a) {
+	int count = a;
+
+	if (~reg[2] & 0x80) {
+		return;
+	}
+
+	/* VRC4 IRQ mode */
+	while (count--) {
+		if ((vrc4IRQa & 0x02) && ((vrc4IRQa & 0x04) || ((vrc4IRQCycles -= 3) <= 0))) {
+			if (~vrc4IRQa & 0x04) {
+				vrc4IRQCycles += 341;
+			}
+			if (!++vrc4IRQCount) {
+				vrc4IRQCount = vrc4IRQLatch;
+				X6502_IRQBegin(FCEU_IQEXT);
+			}
+		}
+	}
+}
+
+static void M556HBHook(void) {
+	int count = mmc3IRQCount;
+
+	if (reg[2] & 0x80) {
+		return;
+	}
+
+	/* MMC3 IRQ mode */
+	if (!count || mmc3IRQReload) {
+		mmc3IRQCount = mmc3IRQLatch;
+	} else {
+		mmc3IRQCount--;
+	}
+	if (count && !mmc3IRQCount && mmc3IRQa) {
+		X6502_IRQBegin(FCEU_IQEXT);
+	}
+	mmc3IRQReload = 0;
+}
+
+static void M556Reset(void) {
+	int i;
+	for (i = 0; i < 5; i++) {
+		reg[i] = 0;
+    }
+	reg[2] = 0x0F;
+	Sync();
+}
+
+static void M556Power(void) {
+	int i;
+	for (i = 0; i < 5; i++) {
+		reg[i] = 0;
+    }
+	for (i = 0; i < 8; i++) {
+		mmc3Reg[i] = 0;
+    }
+	for (i = 0; i < 2; i++) {
+		vrc4Prg[i] = 0;
+    }
+	for (i = 0; i < 8; i++) {
+		vrc4Chr[i] = 0;
+    }
+	mmc3Cmd = mmc3Mirr = mmc3Wram = mmc3IRQLatch = mmc3IRQCount = mmc3IRQa = mmc3IRQReload = 0;
+	vrc4Mirr = vrc4Misc = vrc4IRQLatch = vrc4IRQa = vrc4IRQCount = vrc4IRQCycles = 0;
+	reg[2] = 0x0F;
+	Sync();
+
+	SetReadHandler(0x8000, 0xFFFF, CartBR);
+	SetWriteHandler(0x5000, 0x5FFF, M556WriteReg);
+	SetWriteHandler(0x8000, 0xFFFF, M556Write);
+
+	if (WRAM) {
+		setprg8r(0x10, 0x6000, 0);
+		SetReadHandler(0x6000, 0x7FFF, CartBR);
+		SetWriteHandler(0x6000, 0x7FFF, CartBW);
+	}
+}
+
+static void M556Close(void) {
+	if (WRAM) {
+		FCEU_gfree(WRAM);
+	}
+	WRAM = NULL;
+}
+
+static void StateRestore(int version) {
+	Sync();
+}
+
+void Mapper556_Init(CartInfo *info) {
+	info->Reset = M556Reset;
+	info->Power = M556Power;
+	info->Close = M556Close;
+	MapIRQHook = M556CPUHook;
+	GameHBIRQHook = M556HBHook;
+	GameStateRestore = StateRestore;
+	AddExState(StateRegs, ~0, 0, 0);
+
+	WRAMSIZE = info->PRGRamSize + info->PRGRamSaveSize;
+	if (WRAMSIZE) {
+		WRAM = (uint8 *)FCEU_gmalloc(WRAMSIZE);
+		SetupCartPRGMapping(0x10, WRAM, WRAMSIZE, 1);
+		AddExState(WRAM, WRAMSIZE, 0, "WRAM");
+		if (info->battery) {
+			info->SaveGame[0] = WRAM;
+			info->SaveGameLen[0] = WRAMSIZE;
+		}
+	}
+}
diff --git a/src/ines.c b/src/ines.c
index 345d4c8..a4b6ecb 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -821,6 +821,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "850335C",                  441, Mapper441_Init         )
 	INES_BOARD( "NC-3000M",                 443, Mapper443_Init         )
 	INES_BOARD( "NC-7000M/NC-8000M",        444, Mapper444_Init         )
+	INES_BOARD( "830768C",                  448, Mapper448_Init         )
 	INES_BOARD( "22-in-1 King Series",      449, Mapper449_Init         )
 	INES_BOARD( "DS-9-27",                  452, Mapper452_Init         )
 	INES_BOARD( "N625836",                  455, Mapper455_Init         )
@@ -861,6 +862,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "5-in-1 (CH-501)",          543, Mapper543_Init         )
 	INES_BOARD( "SACHEN 3013",              553, Mapper553_Init         )
 	INES_BOARD( "KS-7010",                  554, Mapper554_Init         )
+	INES_BOARD( "JY-215",                   556, Mapper556_Init         )
 	INES_BOARD( "",                         550, Mapper550_Init         )
 	INES_BOARD( "YC-03-09",                 558, Mapper558_Init         )
 INES_BOARD_END()
diff --git a/src/ines.h b/src/ines.h
index 0d4f5f4..89f41a3 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -330,6 +330,7 @@ void Mapper439_Init(CartInfo *);
 void Mapper441_Init(CartInfo *);
 void Mapper443_Init(CartInfo *);
 void Mapper444_Init(CartInfo *);
+void Mapper448_Init(CartInfo *);
 void Mapper449_Init(CartInfo *);
 void Mapper452_Init(CartInfo *);
 void Mapper455_Init(CartInfo *);
@@ -359,6 +360,7 @@ void Mapper543_Init(CartInfo *);
 void Mapper550_Init(CartInfo *);
 void Mapper553_Init(CartInfo *);
 void Mapper554_Init(CartInfo *);
+void Mapper556_Init(CartInfo *);
 void Mapper558_Init(CartInfo *);
 
 #endif