From cac8c8fa1cc5fd648d30cb7a7a7f049a81979d16 Mon Sep 17 00:00:00 2001
From: negativeExponent <negativeExponent@users.noreply.github.com>
Date: Sat, 12 Feb 2022 10:13:30 +0800
Subject: [PATCH] Add mapper 417

---
 src/boards/417.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |  1 +
 src/ines.h       |  1 +
 3 files changed, 82 insertions(+)
 create mode 100644 src/boards/417.c

diff --git a/src/boards/417.c b/src/boards/417.c
new file mode 100644
index 0000000..bea2e35
--- /dev/null
+++ b/src/boards/417.c
@@ -0,0 +1,80 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2022 negativeExponent
+ *
+ * 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 uint8 preg[4];
+static uint8 creg[8];
+static uint8 nt[4];
+static uint8 IRQa;
+static uint16 IRQCount;
+
+static SFORMAT StateRegs[] = {
+	{ preg, 4, "PREG" },
+    { creg, 8, "CREG" },
+    { nt, 4, "NREG" },
+    { &IRQa, 1, "IRQA" },
+    { &IRQCount, 2, "IRQC" },
+	{ 0 }
+};
+
+static void Sync(void) {
+    int i;
+    setprg8(0x8000, preg[0]);
+    setprg8(0xA000, preg[1]);
+    setprg8(0xC000, preg[2]);
+    setprg8(0xE000, ~0);
+    for (i = 0; i < 8; i++) setchr1(i << 10, creg[i]);
+    setmirrorw(nt[0] & 1, nt[1] & 1, nt[2] & 1, nt[3] & 1);
+}
+
+static DECLFW(M417Write) {
+    switch ((A >> 4) & 7) {
+    case 0: preg[A & 3] = V; Sync(); break;
+    case 1: creg[0 | (A & 3)] = V; Sync(); break;
+    case 2: creg[4 | (A & 3)] = V; Sync(); break;break;
+    case 3: IRQCount = 0; IRQa = 1; break;
+    case 4: IRQa = 0; X6502_IRQEnd(FCEU_IQEXT); break;
+    case 5: nt[A & 3] = V; Sync(); break;
+    }
+}
+
+static void M417Power(void) {
+	Sync();
+    SetReadHandler(0x8000, 0xFFFF, CartBR);
+    SetWriteHandler(0x8000, 0xFFFF, M417Write);
+}
+
+static void M417IRQHook(int a) {
+    IRQCount += a;
+    if (IRQa && IRQCount > 1024)
+        X6502_IRQBegin(FCEU_IQEXT);
+}
+
+static void StateRestore(int version) {
+	Sync();
+}
+
+void Mapper417_Init(CartInfo *info) {
+	info->Power = M417Power;
+    MapIRQHook = M417IRQHook;
+	GameStateRestore = StateRestore;
+	AddExState(&StateRegs, ~0, 0, 0);
+}
diff --git a/src/ines.c b/src/ines.c
index ffb8dc3..8c9035d 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -714,6 +714,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "A88S-1",                   411, Mapper411_Init         )
 	INES_BOARD( "0353",                     415, Mapper415_Init         )
 	INES_BOARD( "4-in-1/N-32",              416, Mapper416_Init         )
+	INES_BOARD( "",                         417, Mapper417_Init         )
 	INES_BOARD( "BS-400R/BS-4040",          422, Mapper422_Init         )
 	INES_BOARD( "Realtec 8090",             432, Mapper432_Init         )
 	INES_BOARD( "NC-20MB",                  433, Mapper433_Init         )
diff --git a/src/ines.h b/src/ines.h
index 884fd95..90f3fa6 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -298,6 +298,7 @@ void Mapper410_Init(CartInfo *);
 void Mapper411_Init(CartInfo *);
 void Mapper415_Init(CartInfo *);
 void Mapper416_Init(CartInfo *);
+void Mapper417_Init(CartInfo *);
 void Mapper421_Init(CartInfo *);
 void Mapper422_Init(CartInfo *);
 void Mapper428_Init(CartInfo *);