From 00b1bd0e9f2abb8eab76f1eb2ac4e97ce5187c44 Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Thu, 11 Sep 2025 00:03:29 +0200
Subject: [PATCH] Add mapper 557.

---
 src/boards/557.c       |  37 ++++++++++++++
 src/boards/asic_n118.c | 108 +++++++++++++++++++++++++++++++++++++++++
 src/boards/asic_n118.h |  36 ++++++++++++++
 src/ines.c             |   1 +
 src/ines.h             |   1 +
 5 files changed, 183 insertions(+)
 create mode 100644 src/boards/557.c
 create mode 100644 src/boards/asic_n118.c
 create mode 100644 src/boards/asic_n118.h

diff --git a/src/boards/557.c b/src/boards/557.c
new file mode 100644
index 0000000..4f8dff5
--- /dev/null
+++ b/src/boards/557.c
@@ -0,0 +1,37 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2020
+ *
+ * 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"
+#include "asic_n118.h"
+#include "wram.h"
+
+static void sync() {
+	setprg8r(0x10, 0x6000, 0);
+	N118_syncPRG(0x0F, 0x00);
+	setchr8(0);
+	setmirror(N118_getCHRBank(7) &0x20? MI_H: MI_V);
+}
+
+void Mapper557_Init(CartInfo *info) {
+	N118_init(info, sync, NULL, NULL);
+	WRAM_init(info, 8);
+}
diff --git a/src/boards/asic_n118.c b/src/boards/asic_n118.c
new file mode 100644
index 0000000..757875a
--- /dev/null
+++ b/src/boards/asic_n118.c
@@ -0,0 +1,108 @@
+/* FCE Ultra - 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"
+#include "asic_n118.h"
+
+static void (*N118_cbSync)();
+static int (*N118_cbGetPRGBank)(uint8);
+static int (*N118_cbGetCHRBank)(uint8);
+static uint8 N118_index;
+static uint8 N118_reg[8];
+
+static SFORMAT N118_state[] = {
+	{ N118_reg,   8, "N8RG" },
+	{&N118_index, 1, "N8IX" },
+	{ 0 }
+};
+
+int N118_getPRGBank (uint8 bank) {
+	return bank &2? (0xFE | bank &1): N118_reg[6 | bank &1];
+}
+
+int N118_getCHRBank (uint8 bank) {
+	return bank &4? N118_reg[bank -2]: (N118_reg[bank >>1] &~1 | bank &1);
+}
+
+void N118_syncPRG (int AND, int OR) {
+	int bank;
+	for (bank = 0; bank < 4; bank++) setprg8(0x8000 | bank <<13, N118_cbGetPRGBank(bank) &AND |OR);
+}
+
+void N118_syncCHR (int AND, int OR) {
+	int bank;
+	for (bank = 0; bank < 8; bank++) setchr1(bank <<10, N118_cbGetCHRBank(bank) &AND |OR);
+}
+
+DECLFW(N118_writeReg) {
+	if (A &1) {
+		N118_reg[N118_index &7] = V;
+		N118_cbSync();
+	} else
+		N118_index = V;
+}
+
+void N118_clear () {
+	N118_reg[0] = 0; N118_reg[1] = 2; N118_reg[2] = 4; N118_reg[3] = 5; N118_reg[4] = 6; N118_reg[5] = 7; N118_reg[6] = 0; N118_reg[7] = 1;
+	N118_index = 0;
+	N118_cbSync();
+}
+
+static void N118_setHandlers () {
+	SetReadHandler (0x6000, 0xFFFF, CartBR);
+	SetWriteHandler(0x6000, 0x7FFF, CartBW);
+	SetWriteHandler(0x8000, 0x9FFF, N118_writeReg);
+}
+
+static void N118_configure (void (*sync)(), int (*prg)(uint8), int (*chr)(uint8)) {
+	N118_cbSync = sync;
+	N118_cbGetPRGBank = prg? prg: N118_getPRGBank;
+	N118_cbGetCHRBank = chr? chr: N118_getCHRBank;
+}
+
+void N118_activate (uint8 clear, void (*sync)(), int (*prg)(uint8), int (*chr)(uint8)) {
+	N118_configure(sync, prg, chr);
+	N118_setHandlers();
+	if (clear)
+		N118_clear();
+	else
+		N118_cbSync();
+}
+
+void N118_addExState () {
+	AddExState(N118_state, ~0, 0, 0);
+}
+
+void N118_restore (int version) {
+	N118_cbSync();
+}
+
+void N118_power () {
+	N118_setHandlers();
+	N118_clear();
+}
+
+void N118_init (CartInfo *info, void (*sync)(), int (*prg)(uint8), int (*chr)(uint8)) {
+	N118_addExState();
+	N118_configure(sync, prg, chr);
+	info->Power = N118_power;
+	info->Reset = N118_cbSync;
+	GameStateRestore = N118_restore;
+}
diff --git a/src/boards/asic_n118.h b/src/boards/asic_n118.h
new file mode 100644
index 0000000..77438ae
--- /dev/null
+++ b/src/boards/asic_n118.h
@@ -0,0 +1,36 @@
+/* FCE Ultra - 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
+ */
+
+#ifndef _ASIC_N118_H
+#define _ASIC_N118_H
+
+int N118_getPRGBank (uint8);
+int N118_getCHRBank (uint8);
+void N118_syncPRG (int, int);
+void N118_syncCHR (int, int);
+DECLFW (N118_writeReg);
+void N118_clear ();
+void N118_activate (uint8, void (*)(), int (*)(uint8), int (*)(uint8));
+void N118_addExState();
+void N118_restore (int);
+void N118_power ();
+void N118_init (CartInfo *, void (*)(), int (*)(uint8), int (*)(uint8));
+
+#endif
diff --git a/src/ines.c b/src/ines.c
index 6145274..0825ede 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -965,6 +965,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "KS-7010",                  554, Mapper554_Init         )
 	INES_BOARD( "",                  	555, Mapper555_Init         )
 	INES_BOARD( "JY-215",                   556, Mapper556_Init         )
+	INES_BOARD( "NTDEC 2718",               557, Mapper557_Init         )
 	INES_BOARD( "YC-03-09",                 558, Mapper558_Init         )
 	INES_BOARD( "Subor Sango II",           559, Mapper559_Init         )
 	INES_BOARD( "Bung Super Game Doctor",   561, Mapper561_562_Init     )
diff --git a/src/ines.h b/src/ines.h
index 5af07f2..37695a7 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -432,6 +432,7 @@ void Mapper553_Init(CartInfo *);
 void Mapper554_Init(CartInfo *);
 void Mapper555_Init(CartInfo *);
 void Mapper556_Init(CartInfo *);
+void Mapper557_Init(CartInfo *);
 void Mapper558_Init(CartInfo *);
 void Mapper559_Init(CartInfo *);
 void Mapper561_562_Init(CartInfo *);