Add mapper 277

src/boards/277.c

@@ -0,0 +1,64 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2006 CaH4e3
+ *  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
+ */
+
+#include "mapinc.h"
+#include "latch.h"
+
+static void Sync(void) {
+    if (!(latch.data & 1) && (latch.data & 8)) {
+        setprg16(0x8000, latch.data & ~1);
+        setprg16(0xC000, latch.data |  1);
+    } else {
+        if (latch.data & 8) {
+            setprg16(0x8000, latch.data);
+            setprg16(0xC000, latch.data);
+        } else {
+            setprg16(0x8000, latch.data);
+            setprg16(0xC000, latch.data | 7);
+        }
+    }
+	setchr8(0);
+	setmirror(((latch.data >> 4) & 1) ^ 1);
+}
+
+static DECLFW(M277Write) {
+	if (!(latch.data & 0x20)) {
+		LatchWrite(A, V);
+	}
+}
+
+static void M277Power(void) {
+    LatchPower();
+    latch.data = 8;
+    Sync();
+	SetWriteHandler(0x8000, 0xFFFF, M277Write);
+}
+
+static void M277Reset() {
+    latch.data = 0x08;
+    Sync();
+}
+
+void Mapper277_Init(CartInfo *info) {
+	Latch_Init(info, Sync, NULL, 0, 0);
+	info->Power = M277Power;
+	info->Reset = M277Reset;
+}