From 6e9c54f79564d89a3747b9fc75209365c60a478f Mon Sep 17 00:00:00 2001
From: negativeExponent <negativeExponent@users.noreply.github.com>
Date: Sun, 6 Feb 2022 21:35:17 +0800
Subject: [PATCH] Add mapper 404

---
 src/boards/mmc1.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 src/ines.c        |  1 +
 src/ines.h        |  1 +
 3 files changed, 46 insertions(+)

diff --git a/src/boards/mmc1.c b/src/boards/mmc1.c
index e30ba53..126364a 100644
--- a/src/boards/mmc1.c
+++ b/src/boards/mmc1.c
@@ -681,3 +681,47 @@ void Mapper550_Init(CartInfo *info) {
 	AddExState(&latch, 1, 0, "LATC");
 	AddExState(&outerBank, 1, 0, "BANK");
 }
+
+/* ---------------------------- Mapper 404 -------------------------------- */
+
+/* NES 2.0 Mapper 404 - JY012005
+ * 1998 Super HiK 8-in-1 (JY-021B)*/
+
+static uint8_t outerBank;
+
+static void M404PRG16(uint32 A, uint8 V) {
+	uint8 mask = outerBank & 0x40 ? 0x07 : 0x0F;
+	setprg16(A, (V & mask) | (outerBank << 3) & ~mask);
+}
+
+static void M404CHR4(uint32 A, uint8 V) {
+	setchr4(A, (V & 0x1F) | outerBank << 5);
+}
+
+static DECLFW(M404Write) {
+	if (!(outerBank & 0x80)) {
+		outerBank = V;
+		MMC1PRG();
+		MMC1CHR();
+	}
+}
+
+static void M404Reset(void) {
+	outerBank = 0;
+	MMC1CMReset();
+}
+
+static void M404Power(void) {
+	outerBank = 0;
+	GenMMC1Power();
+	SetWriteHandler(0x6000, 0x7FFF, M404Write);
+}
+
+void Mapper404_Init(CartInfo *info) {
+	GenMMC1Init(info, 256, 256, 0, 0);
+	info->Power = M404Power;
+	info->Reset = M404Reset;
+	MMC1CHRHook4 = M404CHR4;
+	MMC1PRGHook16 = M404PRG16;
+	AddExState(&outerBank, 1, 0, "BANK");
+}
\ No newline at end of file
diff --git a/src/ines.c b/src/ines.c
index 29b43aa..48e5d35 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -797,6 +797,7 @@ INES_BOARD_BEGIN()
     INES_BOARD( "YY850437C",                396, Mapper396_Init         )
 	INES_BOARD( "YY850439C",                397, Mapper397_Init         )
 	INES_BOARD( "831019C J-2282",           402, J2282_Init             )
+	INES_BOARD( "JY012005",                 404, Mapper404_Init             )
 	INES_BOARD( "JY-302",                   410, Mapper410_Init             )
 	INES_BOARD( "SC871115C",                421, Mapper421_Init         )
 	INES_BOARD( "AB-G1L/WELL-NO-DG450",     428, Mapper428_Init         )
diff --git a/src/ines.h b/src/ines.h
index a211b85..944c68c 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -290,6 +290,7 @@ void Mapper396_Init(CartInfo *);
 void Mapper397_Init(CartInfo *);
 void Mapper401_Init(CartInfo *);
 void Mapper403_Init(CartInfo *);
+void Mapper404_Init(CartInfo *);
 void Mapper410_Init(CartInfo *);
 void Mapper411_Init(CartInfo *);
 void Mapper421_Init(CartInfo *);