From 2d82ec73e6a86ff175658478ac7da0fb88966cd7 Mon Sep 17 00:00:00 2001
From: libretroadmin <reallibretroretroarch@gmail.com>
Date: Sun, 9 Jun 2024 18:27:44 +0200
Subject: [PATCH] Add mapper 430

---
 src/boards/430.c  | 66 +++++++++++++++++++++++++++++++++++++++++++++++
 src/boards/mmc3.c |  4 +++
 src/boards/mmc3.h |  1 +
 src/ines.c        |  1 +
 src/ines.h        |  1 +
 5 files changed, 73 insertions(+)
 create mode 100644 src/boards/430.c

diff --git a/src/boards/430.c b/src/boards/430.c
new file mode 100644
index 0000000..8fc0227
--- /dev/null
+++ b/src/boards/430.c
@@ -0,0 +1,66 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  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 "mmc3.h"
+
+static void M430CW(uint32 A, uint8 V) {
+	uint8 mask = (EXPREGS[0] & 4) ? 0x7F : 0xFF;
+	setchr1(A, ((EXPREGS[0] << 6) & ~mask) | (V & mask));
+}
+
+static void M430PW(uint32 A, uint8 V) {
+	if (EXPREGS[0] & 8) {
+		setprg8(0x8000, ((EXPREGS[0] << 4) & 0x30) | ((DRegBuf[6] & ~2) & 0x0F));
+		setprg8(0xA000, ((EXPREGS[0] << 4) & 0x30) | ((DRegBuf[7] & ~2) & 0x0F));
+		setprg8(0xC000, ((EXPREGS[0] << 4) & 0x30) | ((DRegBuf[6] |  2) & 0x0F));
+		setprg8(0xE000, ((EXPREGS[0] << 4) & 0x30) | ((DRegBuf[7] |  2) & 0x0F));
+	} else {
+		setprg8(A, ((EXPREGS[0] << 4) & 0x30) | (V & 0x0F));
+	}
+}
+
+static DECLFW(M430Write) {
+	if (MMC3CanWriteToWRAM()) {
+	    EXPREGS[0] = A & 0xFF;
+	    FixMMC3PRG(MMC3_cmd);        
+	    FixMMC3CHR(MMC3_cmd);
+    }
+}
+
+static void M430Reset(void) {
+	EXPREGS[0] = 0;
+	MMC3RegReset();
+}
+
+static void M430Power(void) {
+	EXPREGS[0] = 0;
+	GenMMC3Power();
+	SetWriteHandler(0x6000, 0x7FFF, M430Write);
+}
+
+void Mapper430_Init(CartInfo *info) {
+	GenMMC3_Init(info, 128, 256, 0, 0);
+	cwrap = M430CW;
+	pwrap = M430PW;
+	info->Reset = M430Reset;
+	info->Power = M430Power;
+	AddExState(EXPREGS, 1, 0, "EXPR");
+}
diff --git a/src/boards/mmc3.c b/src/boards/mmc3.c
index 4e65121..f02fb84 100644
--- a/src/boards/mmc3.c
+++ b/src/boards/mmc3.c
@@ -70,6 +70,10 @@ void GenMMC3_Init(CartInfo *info, int prg, int chr, int wram, int battery);
  * ----------------------------------------------------------------------
  */
 
+int MMC3CanWriteToWRAM(void) {
+	return ((A001B & 0x80) && !(A001B & 0x40));
+}
+
 void FixMMC3PRG(int V) {
 	if (V & 0x40) {
 		pwrap(0xC000, DRegBuf[6]);
diff --git a/src/boards/mmc3.h b/src/boards/mmc3.h
index b29a53e..911b635 100644
--- a/src/boards/mmc3.h
+++ b/src/boards/mmc3.h
@@ -20,6 +20,7 @@ void FixMMC3PRG(int V);
 void FixMMC3CHR(int V);
 DECLFW(MMC3_CMDWrite);
 DECLFW(MMC3_IRQWrite);
+int MMC3CanWriteToWRAM(void);
 
 void GenMMC3_Init(CartInfo *info, int prg, int chr, int wram, int battery);
 
diff --git a/src/ines.c b/src/ines.c
index 517ec22..cdbdd44 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -812,6 +812,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "BS-400R/BS-4040",          422, Mapper422_Init         )
 	INES_BOARD( "AB-G1L/WELL-NO-DG450",     428, Mapper428_Init         )
 	INES_BOARD( "LIKO BBG-235-8-1B",        429, Mapper429_Init         )
+	INES_BOARD( "831031C/T-308",            430, Mapper430_Init         )
 	INES_BOARD( "Realtek GN-91B",           431, Mapper431_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 819e5ff..88ead23 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -321,6 +321,7 @@ void Mapper421_Init(CartInfo *);
 void Mapper422_Init(CartInfo *);
 void Mapper428_Init(CartInfo *);
 void Mapper429_Init(CartInfo *);
+void Mapper430_Init(CartInfo *);
 void Mapper431_Init(CartInfo *);
 void Mapper432_Init(CartInfo *);
 void Mapper433_Init(CartInfo *);