From dca5ff5a1a585c31d2100871dea28f63d8626084 Mon Sep 17 00:00:00 2001
From: negativeExponent <negativeExponent@users.noreply.github.com>
Date: Tue, 28 Jan 2020 08:15:53 +0800
Subject: [PATCH] Add mapper 372

---
 src/boards/372.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c       |   1 +
 src/ines.h       |   1 +
 3 files changed, 112 insertions(+)
 create mode 100644 src/boards/372.c

diff --git a/src/boards/372.c b/src/boards/372.c
new file mode 100644
index 0000000..36d9800
--- /dev/null
+++ b/src/boards/372.c
@@ -0,0 +1,110 @@
+/* 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.
+ */
+
+/* added 2020-1-28 - negativeExponent */
+/* NES 2.0 Mapper 372 is used for a revision of the Rockman I-VI multicart (PCB ID SFC-12).
+ * It is INES Mapper 045 but with one bit of outer bank register #2 working as a CHR-ROM/RAM switch.
+ */
+
+#include "mapinc.h"
+#include "mmc3.h"
+
+static uint8 WRAM[0x2000];
+static uint32 CHRRAMSIZE;
+static uint8 *CHRRAM;
+
+static void M372CW(uint32 A, uint8 V) {
+	if (!UNIFchrrama) {
+		uint32 NV = V;
+		if (EXPREGS[2] & 8)
+			NV &= (1 << ((EXPREGS[2] & 7) + 1)) - 1;
+		else if (EXPREGS[2])
+			NV &= 0;	/* hack ;( don't know exactly how it should be */
+		NV |= EXPREGS[0] | ((EXPREGS[2] & 0xF0) << 4);
+        if (EXPREGS[2] & 0x20)
+		    setchr1r(0x10, A, V);
+		else
+			setchr1(A, NV);
+	} else
+		/* setchr8(0); */		/* i don't know what cart need this, but a new one need other lol */
+		setchr1(A, V);
+}
+
+static void M372PW(uint32 A, uint8 V) {
+	uint32 MV = V & ((EXPREGS[3] & 0x3F) ^ 0x3F);
+	MV |= EXPREGS[1];
+	if(UNIFchrrama)
+		MV |= ((EXPREGS[2] & 0x40) << 2);
+	setprg8(A, MV);
+/*	FCEU_printf("1:%02x 2:%02x 3:%02x A=%04x V=%03x\n",EXPREGS[1],EXPREGS[2],EXPREGS[3],A,MV); */
+}
+
+static DECLFW(M372Write) {
+	if (EXPREGS[3] & 0x40) {
+		WRAM[A - 0x6000] = V;
+		return;
+	}
+	EXPREGS[EXPREGS[4]] = V;
+	EXPREGS[4] = (EXPREGS[4] + 1) & 3;
+	FixMMC3PRG(MMC3_cmd);
+	FixMMC3CHR(MMC3_cmd);
+}
+
+static DECLFR(M372Read) {
+	uint32 addr = 1 << (EXPREGS[5] + 4);
+	if (A & (addr | (addr - 1)))
+		return X.DB | 1;
+	else
+		return X.DB;
+}
+
+static void M372Reset(void) {
+	EXPREGS[0] = EXPREGS[1] = EXPREGS[2] = EXPREGS[3] = EXPREGS[4] = 0;
+	EXPREGS[5]++;
+	EXPREGS[5] &= 7;
+	MMC3RegReset();
+}
+
+static void M372Power(void) {
+	GenMMC3Power();
+	EXPREGS[0] = EXPREGS[1] = EXPREGS[2] = EXPREGS[3] = EXPREGS[4] = EXPREGS[5] = 0;
+	SetWriteHandler(0x5000, 0x7FFF, M372Write);
+	SetReadHandler(0x5000, 0x5FFF, M372Read);
+}
+
+static void M372Close(void) {
+	if (CHRRAM)
+		FCEU_gfree(CHRRAM);
+	CHRRAM = NULL;
+}
+
+void Mapper372_Init(CartInfo *info) {
+	GenMMC3_Init(info, 512, 256, 8, info->battery);
+	cwrap = M372CW;
+	pwrap = M372PW;
+	info->Reset = M372Reset;
+	info->Power = M372Power;
+	info->Close = M372Close;
+	CHRRAMSIZE = 8192;
+	CHRRAM = (uint8*)FCEU_gmalloc(CHRRAMSIZE);
+	SetupCartCHRMapping(0x10, CHRRAM, CHRRAMSIZE, 1);
+	AddExState(CHRRAM, CHRRAMSIZE, 0, "CHRR");
+	AddExState(EXPREGS, 5, 0, "EXPR");
+}
diff --git a/src/ines.c b/src/ines.c
index bfcb937..535f381 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -661,6 +661,7 @@ static BMAPPINGLocal bmap[] = {
 	{(uint8_t*)"GN-45",					366, GN45_Init},
 
 	{(uint8_t*)"Bit Corp 4-in-1",		357, Mapper357_Init },
+	{(uint8_t*)"MMC3 PIRATE SFC-12",	372, Mapper372_Init },
 
 	/* UNIF to NES 2.0 BOARDS */
 
diff --git a/src/ines.h b/src/ines.h
index bcc20a6..6ddb767 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -244,5 +244,6 @@ void NC7000M_Init(CartInfo *);
 void J2282_Init(CartInfo *);
 
 void Mapper357_Init(CartInfo *);
+void Mapper372_Init(CartInfo *info);
 
 #endif