From 2b172d3eb2b62fd57dc8e2a27f3242a0c8d7ab42 Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Fri, 30 Dec 2022 00:43:48 +0100
Subject: [PATCH] Mapper 195: Reimplemented according to nesdev description.
 This makes the emulaton compatible with unhacked Captain Tsubasa 2, and
 IN-compatible with hacked Captain Tsubasa 2.

---
 src/boards/195.c  | 88 +++++++++++++++++++++++++++++++++++++++++++++++
 src/boards/mmc3.c | 34 +++++-------------
 2 files changed, 96 insertions(+), 26 deletions(-)
 create mode 100644 src/boards/195.c

diff --git a/src/boards/195.c b/src/boards/195.c
new file mode 100644
index 0000000..c33fb08
--- /dev/null
+++ b/src/boards/195.c
@@ -0,0 +1,88 @@
+/* FCEUmm - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2022
+ *
+ * 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"
+
+writefunc writePPU;
+static uint8 *CHRRAM;
+static uint32 CHRRAMSIZE;
+static uint8 mask;
+static uint8 compare;
+extern uint32 RefreshAddr;
+
+static void Mapper195_CHRWrap(uint32 A, uint8 V) {
+	if ((V &mask) ==compare)
+		setchr1r(0x10, A, V);
+	else
+		setchr1r(0, A, V);
+}
+
+static const uint8 compares[8] = { 0x28, 0x00, 0x4C, 0x64, 0x46, 0x7C, 0x04, 0xFF };
+static DECLFW(Mapper195_InterceptPPUWrite) {
+	if (RefreshAddr <0x2000) {
+		int addr =RefreshAddr;
+		int reg, bank;
+
+		if (MMC3_cmd &0x80) addr ^=0x1000;
+		if (addr <0x1000)
+			reg =addr >>11;
+		else
+			reg =(addr >>10) -2;
+
+		bank =DRegBuf[reg];
+		if (bank &0x80) {
+			if (bank &0x10) {
+				mask =0x00;
+				compare =0xFF;
+			} else {
+				int index =(bank &0x02? 1: 0) | (bank &0x08? 2: 0) | (bank &0x40? 4: 0);
+				mask =bank &0x40? 0xFE: 0xFC;
+				compare =compares[index];
+			}
+			FixMMC3CHR(MMC3_cmd);
+		}
+	}
+	writePPU(A, V);
+}
+
+static void Mapper195_Power(void) {
+	mask =0xFC;
+	compare =0x00;
+	GenMMC3Power();
+	setprg4r(0x10, 0x5000, 2);
+	SetWriteHandler(0x5000, 0x5FFF, CartBW);
+	SetReadHandler(0x5000, 0x5FFF, CartBR);
+	
+	if (GetWriteHandler(0x2007) !=Mapper195_InterceptPPUWrite) {
+		writePPU =GetWriteHandler(0x2007);
+		SetWriteHandler(0x2007, 0x2007, Mapper195_InterceptPPUWrite);
+	}
+}
+
+void Mapper195_Init(CartInfo *info) {
+	GenMMC3_Init(info, 512, 256, 16, info->battery);
+	cwrap = Mapper195_CHRWrap;
+	info->Power = Mapper195_Power;
+	info->Reset = MMC3RegReset;
+	CHRRAMSIZE =4096;
+	CHRRAM =(uint8*)FCEU_gmalloc(CHRRAMSIZE);
+	SetupCartCHRMapping(0x10, CHRRAM, CHRRAMSIZE, 1);
+	AddExState(CHRRAM, CHRRAMSIZE, 0, "CHRR");
+}
diff --git a/src/boards/mmc3.c b/src/boards/mmc3.c
index b90e7cb..864e498 100644
--- a/src/boards/mmc3.c
+++ b/src/boards/mmc3.c
@@ -1007,31 +1007,6 @@ void Mapper194_Init(CartInfo *info) {
 	AddExState(CHRRAM, CHRRAMSIZE, 0, "CHRR");
 }
 
-/* ---------------------------- Mapper 195 ------------------------------- */
-static void M195CW(uint32 A, uint8 V) {
-	if (V <= 3)	/* Crystalis (c).nes, Captain Tsubasa Vol 2 - Super Striker (C) */
-		setchr1r(0x10, A, V);
-	else
-		setchr1r(0, A, V);
-}
-
-static void M195Power(void) {
-	GenMMC3Power();
-	setprg4r(0x10, 0x5000, 2);
-	SetWriteHandler(0x5000, 0x5fff, CartBW);
-	SetReadHandler(0x5000, 0x5fff, CartBR);
-}
-
-void Mapper195_Init(CartInfo *info) {
-	GenMMC3_Init(info, 512, 256, 16, info->battery);
-	cwrap = M195CW;
-	info->Power = M195Power;
-	CHRRAMSIZE = 4096;
-	CHRRAM = (uint8*)FCEU_gmalloc(CHRRAMSIZE);
-	SetupCartCHRMapping(0x10, CHRRAM, CHRRAMSIZE, 1);
-	AddExState(CHRRAM, CHRRAMSIZE, 0, "CHRR");
-}
-
 /* ---------------------------- Mapper 196 ------------------------------- */
 /* MMC3 board with optional command address line connection, allows to
  * make three-four different wirings to IRQ address lines and separately to
@@ -1127,6 +1102,13 @@ void Mapper197_Init(CartInfo *info) {
 
 /* ---------------------------- Mapper 198 ------------------------------- */
 
+static void M198Power(void) {
+	GenMMC3Power();
+	setprg4r(0x10, 0x5000, 2);
+	SetWriteHandler(0x5000, 0x5fff, CartBW);
+	SetReadHandler(0x5000, 0x5fff, CartBR);
+}
+
 static void M198PW(uint32 A, uint8 V) {
 	if (V >= 0x50)	/* Tenchi o Kurau II - Shokatsu Koumei Den (J) (C).nes */
 		setprg8(A, V & 0x4F);
@@ -1137,7 +1119,7 @@ static void M198PW(uint32 A, uint8 V) {
 void Mapper198_Init(CartInfo *info) {
 	GenMMC3_Init(info, 1024, 0, 16, info->battery);
 	pwrap = M198PW;
-	info->Power = M195Power;
+	info->Power = M198Power;
 }
 
 /* ---------------------------- Mapper 205 ------------------------------ */