From 943cccd0feb2469eb7f1b2d88d54624ccf0d1905 Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Mon, 8 Sep 2025 17:05:45 +0200
Subject: [PATCH] Add mapper 579.

---
 src/boards/579.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |  1 +
 src/ines.h       |  1 +
 3 files changed, 51 insertions(+)
 create mode 100644 src/boards/579.c

diff --git a/src/boards/579.c b/src/boards/579.c
new file mode 100644
index 0000000..0357e52
--- /dev/null
+++ b/src/boards/579.c
@@ -0,0 +1,49 @@
+/* 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 >>2 &0x1F;
+	if (Latch_address &0x200) {
+		setprg16(0x8000, prg);
+		setprg16(0xC000, prg |7);
+	} else {
+		if (Latch_address &0x001)
+			setprg32(0x8000, prg >>1);
+		else {
+			setprg16(0x8000, prg);
+			setprg16(0xC000, prg);
+		}
+	}
+	SetupCartCHRMapping(0, CHRptr[0], CHRsize[0], Latch_address &0x80? 0: 1);
+	setchr8(0);
+	setmirror(Latch_address &0x02? MI_H: MI_V);
+}
+
+void protectLatchBits (uint16 *address, uint8 *newValue, uint8 romValue) { /* Once bit 9 is set, only the inner bank bits can be modified. */
+	if (Latch_address &0x200) *address = *address &0x01C | Latch_address &~0x01C;
+}
+
+void Mapper579_Init (CartInfo *info) {
+	Latch_init(info, sync, 0x8000, 0xFFFF, protectLatchBits);
+	info->Reset = Latch_power;
+}
diff --git a/src/ines.c b/src/ines.c
index 547adc5..bd4d6ef 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -948,6 +948,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "Bung Super Game Doctor",   561, Mapper561_562_Init     )
 	INES_BOARD( "Venus Turbo Game Doctor",  562, Mapper561_562_Init     )
 	INES_BOARD( "J-2020",                   563, Mapper563_Init         )
+	INES_BOARD( "T-215",                    579, Mapper579_Init         )
 	INES_BOARD( "HN-02",                    586, Mapper586_Init         )
 INES_BOARD_END()
 
diff --git a/src/ines.h b/src/ines.h
index 0991fed..423ba96 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -413,6 +413,7 @@ void Mapper558_Init(CartInfo *);
 void Mapper559_Init(CartInfo *);
 void Mapper561_562_Init(CartInfo *);
 void Mapper563_Init(CartInfo *);
+void Mapper579_Init(CartInfo *);
 void Mapper586_Init(CartInfo *);
 
 void FFE_Init(CartInfo *);