Add mapper 583.

src/boards/583.c

@@ -0,0 +1,50 @@
+/* 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_latch.h"
+
+static void sync () {
+	int prg = Latch_address &~0xF | Latch_address <<3 &0x08;
+	if (Latch_address &0x20) {
+		setprg32(0x8000, prg >>1 &~7 | Latch_data &7);
+		setmirror(Latch_data &0x10? MI_1: MI_0);
+	} else {
+		if (Latch_address &0x10 && Latch_address &0x08) {
+			setprg16(0x8000, prg &~0x03 | Latch_data &0x03);
+			setprg16(0xC000, prg        |             0x03);
+			setmirror(MI_H);
+		} else {
+			setprg16(0x8000, prg &~0x07 | Latch_data &0x07);
+			setprg16(0xC000, prg        |             0x07);
+			setmirror(MI_V);
+		}
+	}
+	setchr8(0);
+}
+
+static void trapLatchWrite (uint16 *newAddress, uint8 *newValue, uint8 romValue) { /* The address bits are only updated on a rising edge of A7. */
+	if (!(~Latch_address &0x80 && *newAddress &0x80)) *newAddress = Latch_address;
+}
+
+void Mapper583_Init (CartInfo *info) {
+	Latch_init(info, sync, 0x8000, 0xFFFF, trapLatchWrite);
+	info->Reset = Latch_power;
+}