From a9f679ef1512caa6d54f134b99119c419778f52a Mon Sep 17 00:00:00 2001
From: negativeExponent <negativeExponent@users.noreply.github.com>
Date: Tue, 24 Mar 2020 01:34:03 +0800
Subject: [PATCH] Add 42-in-80000 multicart (m380)

---
 src/boards/380.c   | 96 ++++++++++++++++++++++++++++++++++++++++++++++
 src/ines-correct.h |  1 +
 src/ines.c         |  1 +
 src/ines.h         |  3 +-
 4 files changed, 100 insertions(+), 1 deletion(-)
 create mode 100644 src/boards/380.c

diff --git a/src/boards/380.c b/src/boards/380.c
new file mode 100644
index 0000000..a6bf1be
--- /dev/null
+++ b/src/boards/380.c
@@ -0,0 +1,96 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ * Copyright (C) 2020 negativeExponent
+ *
+ * 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.
+ */
+
+/* NES 2.0 Mapper 380 denotes the 970630C circuit board,
+ * used on a 512 KiB multicart having 42 to 80,000 listed NROM and UNROM games. */
+
+#include "mapinc.h"
+
+static uint16 latche;
+static uint8 dipswitch;
+
+static SFORMAT StateRegs[] = {
+   { &latche, 2 | FCEUSTATE_RLSB, "LATC" },
+   { &dipswitch, 1, "DPSW" },
+   { 0 }
+};
+
+static void Sync(void)
+{
+   if (latche & 0x200)
+   {
+      if (latche & 1) /* NROM 128 */
+      {
+         setprg16(0x8000, latche >> 2);
+         setprg16(0xC000, latche >> 2);
+      }
+      else /* NROM-256 */
+         setprg32(0x8000, latche >> 3);
+   }
+   else /* UxROM */
+   {
+      setprg16(0x8000, latche >> 2);
+      setprg16(0xC000, (latche >> 2) | 7);
+   }
+   setmirror(((latche >> 1) & 1) ^ 1);
+}
+
+static DECLFR(M380Read)
+{
+   if (latche & 0x100)
+      return dipswitch;
+   return CartBR(A);
+}
+
+static DECLFW(M380Write)
+{
+   latche = A;
+   Sync();
+}
+
+static void M380Reset(void)
+{
+   dipswitch = (dipswitch + 1) & 0xF;
+   latche = 0;
+   Sync();
+}
+
+static void M380Power(void)
+{
+   dipswitch = 0;
+   latche = 0;
+   Sync();
+   setchr8(0);
+   SetReadHandler(0x8000, 0xFFFF, M380Read);
+   SetWriteHandler(0x8000, 0xFFFF, M380Write);
+}
+
+static void StateRestore(int version)
+{
+   Sync();
+}
+
+void Mapper380_Init(CartInfo *info)
+{
+   info->Power = M380Power;
+   info->Reset = M380Reset;
+   GameStateRestore = StateRestore;
+   AddExState(&StateRegs, ~0, 0, 0);
+}
diff --git a/src/ines-correct.h b/src/ines-correct.h
index 937a154..c34ad79 100644
--- a/src/ines-correct.h
+++ b/src/ines-correct.h
@@ -398,6 +398,7 @@
 	{ 0xf6b9d088,    366,        0 }, /* 4-in-1 (K-3131GS, GN-45) [p1][!] */
 	{ 0x503566b2,    366,        0 }, /* 4-in-1 (K-3131SS, GN-45) [p1][!] */
 	{ 0xDB2D2D88,    369,        -1 }, /* Super Mario Bros. Party.nes */
+	{ 0x87F83EA2,    380,        -1 }, /* 42 to 80,000 */
 	{ 0xC4B94BD5,    389,        -1 }, /* Caltron - 9 in 1 (USA) (Proto) */
 
 	/* ines mappers that uses unif boards */
diff --git a/src/ines.c b/src/ines.c
index 2399220..2bc8ab5 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -670,6 +670,7 @@ INES_BOARD_BEGIN()
 	INES_BOARD( "GN-45",                    366, GN45_Init              )
 	INES_BOARD( "MMC3 PIRATE SFC-12",       372, Mapper372_Init         )
 	INES_BOARD( "95/96 Super HiK 4-in-1",   374, Mapper374_Init         )
+	INES_BOARD( "42 to 80,000 (970630C)",   380, Mapper380_Init         )
 	INES_BOARD( "KN-42",                    381, Mapper381_Init         )
 	INES_BOARD( "830928C",                  382, Mapper382_Init         )
 	INES_BOARD( "Caltron 9-in-1",           389, Mapper389_Init         )
diff --git a/src/ines.h b/src/ines.h
index 4219a7f..24e0abb 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -260,8 +260,9 @@ void Mapper360_Init(CartInfo *);
 void Mapper369_Init(CartInfo *);
 void Mapper372_Init(CartInfo *);
 void Mapper374_Init(CartInfo *);
-void Mapper382_Init(CartInfo *);
+void Mapper380_Init(CartInfo *);
 void Mapper381_Init(CartInfo *);
+void Mapper382_Init(CartInfo *);
 void Mapper389_Init(CartInfo *);
 void Mapper390_Init(CartInfo *);
 void Mapper516_Init(CartInfo *);