From b6cb482bfe109e097ea45762cd85c93afb732d20 Mon Sep 17 00:00:00 2001
From: negativeExponent <negativeExponent@users.noreply.github.com>
Date: Tue, 28 Jan 2020 12:07:47 +0800
Subject: [PATCH] Add mapper 381

---
 src/boards/datalatch.c | 20 ++++++++++++++++++++
 src/ines.c             |  1 +
 src/ines.h             |  1 +
 3 files changed, 22 insertions(+)

diff --git a/src/boards/datalatch.c b/src/boards/datalatch.c
index d40c65d..1926cdf 100644
--- a/src/boards/datalatch.c
+++ b/src/boards/datalatch.c
@@ -490,6 +490,26 @@ void Mapper241_Init(CartInfo *info) {
 	Latch_Init(info, M241Sync, 0, 0x8000, 0xFFFF, 1, 0);
 }
 
+/*------------------ Map 381 ---------------------------*/
+/* 2-in-1 High Standard Game (BC-019), reset-based */
+static uint8 reset = 0;
+static void M381Sync(void) {
+	setprg16(0x8000, ((latche & 0x10) >> 4) | ((latche & 7) << 1) | (reset << 4));
+	setprg16(0xC000, 15 | (reset << 4));
+	setchr8(0);
+}
+
+static void M381Reset(void) {
+	reset ^= 1;
+	M381Sync();
+}
+
+void Mapper381_Init(CartInfo *info) {
+	info->Reset = M381Reset;
+	Latch_Init(info, M381Sync, 0, 0x8000, 0xFFFF, 1, 0);
+	AddExState(&reset, 1, 0, "RST0");
+}
+
 /*------------------ Map 538 ---------------------------*/
 /* NES 2.0 Mapper 538 denotes the 60-1064-16L PCB, used for a
  * bootleg cartridge conversion named Super Soccer Champion
diff --git a/src/ines.c b/src/ines.c
index a016e75..e9f058d 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -662,6 +662,7 @@ static BMAPPINGLocal bmap[] = {
 	
 	{(uint8_t*)"Bit Corp 4-in-1",		357, Mapper357_Init },
 	{(uint8_t*)"MMC3 PIRATE SFC-12",	372, Mapper372_Init },
+	{(uint8_t*)"KN-42",					381, Mapper381_Init },
 	{(uint8_t*)"60-1064-16L (FDS)",		538, Mapper538_Init },
 	{(uint8_t*)"LittleCom 160-in-1",	541, Mapper541_Init },
 
diff --git a/src/ines.h b/src/ines.h
index 6a2763b..2047761 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -245,6 +245,7 @@ void J2282_Init(CartInfo *);
 
 void Mapper357_Init(CartInfo *);
 void Mapper372_Init(CartInfo *);
+void Mapper381_Init(CartInfo *);
 void Mapper538_Init(CartInfo *);
 void Mapper541_Init(CartInfo *);