From ced209604c017bcf00002a35046462d713fd6e95 Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Tue, 9 Sep 2025 00:44:10 +0200
Subject: [PATCH] Add mapper 583.

---
 src/boards/583.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |  1 +
 src/ines.h       |  1 +
 3 files changed, 52 insertions(+)
 create mode 100644 src/boards/583.c

diff --git a/src/boards/583.c b/src/boards/583.c
new file mode 100644
index 0000000..483e3ed
--- /dev/null
+++ b/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;
+}
diff --git a/src/ines.c b/src/ines.c
index 1253b3c..93cf2f2 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -954,6 +954,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "5068",                     573, Mapper573_Init         )
 	INES_BOARD( "T-215",                    579, Mapper579_Init         )
 	INES_BOARD( "ET-82",                    581, Mapper581_Init         )
+	INES_BOARD( "8203",                     583, Mapper583_Init         )
 	INES_BOARD( "HN-02",                    586, Mapper586_Init         )
 	INES_BOARD( "ET-81",                    588, Mapper588_Init         )
 	INES_BOARD( "810706",                   589, Mapper589_Init         )
diff --git a/src/ines.h b/src/ines.h
index 5d55090..5ba4eb1 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -419,6 +419,7 @@ void Mapper567_Init(CartInfo *);
 void Mapper573_Init(CartInfo *);
 void Mapper579_Init(CartInfo *);
 void Mapper581_Init(CartInfo *);
+void Mapper583_Init(CartInfo *);
 void Mapper586_Init(CartInfo *);
 void Mapper588_Init(CartInfo *);
 void Mapper589_Init(CartInfo *);