diff --git a/src/boards/sachen.c b/src/boards/sachen.c
index db5e63d..bc79786 100644
--- a/src/boards/sachen.c
+++ b/src/boards/sachen.c
@@ -2,6 +2,7 @@
  *
  * Copyright notice for this file:
  *  Copyright (C) 2002 Xodnizel
+ *  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
@@ -18,10 +19,13 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
+/* 2020-2-3 - updated mapper 150/243 */
+
 #include "mapinc.h"
 
 static uint8 cmd, dip;
 static uint8 latch[8];
+static uint8 mapperNum;
 
 static void S74LS374MSync(uint8 mirr) {
 	switch (mirr & 3) {
@@ -32,7 +36,8 @@ static void S74LS374MSync(uint8 mirr) {
 	}
 }
 
-static void S74LS374NSynco(void) {
+/* old mapper 150 and 243 */
+/* static void S74LS374NSynco(void) {
 	setprg32(0x8000, latch[0]);
 	setchr8(latch[1] | latch[3] | latch[4]);
 	S74LS374MSync(latch[2]);
@@ -57,7 +62,7 @@ static DECLFW(S74LS374NWrite) {
 static DECLFR(S74LS374NRead) {
 	uint8 ret;
 	if ((A & 0x4100) == 0x4100)
-/*		ret=(X.DB&0xC0)|((~cmd)&0x3F); */
+//		ret=(X.DB&0xC0)|((~cmd)&0x3F);
 		ret = ((~cmd) & 0x3F) ^ dip;
 	else
 		ret = X.DB;
@@ -128,7 +133,7 @@ void S74LS374NA_Init(CartInfo *info) {
 	GameStateRestore = S74LS374NRestore;
 	AddExState(latch, 5, 0, "LATC");
 	AddExState(&cmd, 1, 0, "CMD");
-}
+}*/
 
 static int type;
 static void S8259Synco(void) {
@@ -407,3 +412,84 @@ void TCA01_Init(CartInfo *info) {
 	info->Power = TCA01Power;
 }
 
+/* ------------------ Mapper 150 --------------------- */
+/* ------------------ Mapper 243 --------------------- */
+
+/* Mapper 150 - SA-015 / SA-630 / Unif UNL-Sachen-74LS374N */
+/* Mapper 243 - SA-020A */
+
+static void S74LS374NSynco(void) {
+	uint32 chrBank;
+	if (mapperNum == 150)
+		chrBank = (latch[6] & 3) | ((latch[4] << 2) & 4) | (latch[2] << 3);
+	else
+		chrBank = (latch[2] & 1) | ((latch[4] << 1) & 2) | (latch[6] << 2);
+
+	setprg32(0x8000, (latch[2] & 1) | latch[5]);
+	setchr8(chrBank);
+
+	switch ((latch[7] >> 1) & 3) {
+	case 0: setmirrorw(0, 1, 1, 1); break;
+	case 1: setmirror(MI_H); break;
+	case 2: setmirror(MI_V); break;
+	case 3: setmirror(MI_0); break;
+	}
+}
+
+static DECLFR(S74LS374NRead) {
+	uint8 ret;
+	if ((A & 0xC101) == 0x4101) {
+		if (dip & 1)
+			ret = (latch[cmd] & 3) | (X.DB & 0xFC);
+		else
+			ret = (latch[cmd] & 7) | (X.DB & 0xF8);
+	} else {
+		ret = X.DB;
+	}
+	return ret;
+}
+
+static DECLFW(S74LS374NWrite) {
+	if (dip & 1)
+		V |= 4;
+	switch (A & 0xC101) {
+	case 0x4100:
+		cmd = V & 7;
+		break;
+	case 0x4101:
+		latch[cmd] = V & 7;
+		S74LS374NSynco();
+		break;
+	}
+}
+
+static void S74LS374NRestore(int version) {
+	S74LS374NSynco();
+}
+
+static void S74LS374NReset(void) {
+	dip ^= 1;
+	latch[0] = latch[1] = latch[2] = latch[3] = 0;
+	latch[4] = latch[5] = latch[6] = latch[7] = 0;
+	S74LS374NSynco();
+}
+
+static void S74LS374NPower(void) {
+	dip = 0;
+	latch[0] = latch[1] = latch[2] = latch[3] = 0;
+	latch[4] = latch[5] = latch[6] = latch[7] = 0;
+	S74LS374NSynco();
+	SetReadHandler(0x8000, 0xFFFF, CartBR);
+	SetWriteHandler(0x4100, 0x7FFF, S74LS374NWrite);
+	if (mapperNum == 150)
+		SetReadHandler(0x4100, 0x7FFF, S74LS374NRead);
+}
+
+void S74LS374N_Init(CartInfo *info) {
+	mapperNum = info->mapper;
+	info->Power = S74LS374NPower;
+	info->Reset = S74LS374NReset;
+	GameStateRestore = S74LS374NRestore;
+	AddExState(latch, 8, 0, "LATC");
+	AddExState(&cmd, 1, 0, "CMD");
+}
diff --git a/src/ines.c b/src/ines.c
index 3917ba5..aa552ee 100644
--- a/src/ines.c
+++ b/src/ines.c
@@ -545,7 +545,7 @@ static BMAPPINGLocal bmap[] = {
 	{(uint8_t*)"TCU01",				147, TCU01_Init},
 	{(uint8_t*)"SA0037",				148, SA0037_Init},
 	{(uint8_t*)"SA0036",				149, SA0036_Init},
-	{(uint8_t*)"S74LS374N",			150, S74LS374N_Init},
+	{(uint8_t*)"SA-015/SA-630",			150, S74LS374N_Init},
 	{(uint8_t*)"",					151, Mapper151_Init},
 	{(uint8_t*)"",					152, Mapper152_Init},
 	{(uint8_t*)"BANDAI SRAM",			153, Mapper153_Init},	/* Bandai board 16 with SRAM instead of EEPROM */
@@ -638,7 +638,7 @@ static BMAPPINGLocal bmap[] = {
 	{(uint8_t*)"",					240, Mapper240_Init},
 	{(uint8_t*)"",					241, Mapper241_Init},
 	{(uint8_t*)"",					242, Mapper242_Init},
-	{(uint8_t*)"S74LS374NA",			243, S74LS374NA_Init},
+	{(uint8_t*)"SA-020A",			243, S74LS374N_Init},
 	{(uint8_t*)"DECATHLON",			244, Mapper244_Init},
 	{(uint8_t*)"",					245, Mapper245_Init},
 	{(uint8_t*)"FONG SHEN BANG",		246, Mapper246_Init},
diff --git a/src/unif.c b/src/unif.c
index 6d5e666..37917e0 100644
--- a/src/unif.c
+++ b/src/unif.c
@@ -520,7 +520,7 @@ static BMAPPING bmap[] = {
 	{ "SSS-NROM-256", NO_INES, SSSNROM_Init, 0 },
 	{ "SUNSOFT_UNROM", 93, SUNSOFT_UNROM_Init, 0 },	/* fix me, real pcb name, real pcb type */
 	{ "Sachen-74LS374N", 150, S74LS374N_Init, 0 },
-	{ "Sachen-74LS374NA", 243, S74LS374NA_Init, 0 },	/* seems to be custom mapper */
+	{ "Sachen-74LS374NA", 243, S74LS374N_Init, 0 },	/* seems to be custom mapper */
 	{ "Sachen-8259A", 141, S8259A_Init, 0 },
 	{ "Sachen-8259B", 138, S8259B_Init, 0 },
 	{ "Sachen-8259C", 139, S8259C_Init, 0 },