From a9e30eccc8662bd9e3629766cb8bbe986468beed Mon Sep 17 00:00:00 2001
From: Angelo Salese <angelosa@users.noreply.github.com>
Date: Thu, 21 Jul 2011 14:47:47 +0000
Subject: [PATCH] Port from MESS, nw

---
 src/mame/drivers/saturn.c | 2 +-
 src/mame/machine/stvcd.c  | 9 ++++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/mame/drivers/saturn.c b/src/mame/drivers/saturn.c
index cf6ee5aeba1..d9557e097f7 100644
--- a/src/mame/drivers/saturn.c
+++ b/src/mame/drivers/saturn.c
@@ -576,7 +576,7 @@ static WRITE32_HANDLER( saturn_scu_w )
 		case 0x14/4: case 0x34/4: case 0x54/4:
 			if(INDIRECT_MODE(DMA_CH))
 			{
-				if(LOG_SCU) logerror("Indirect Mode DMA lv %d set\n",DMA_CH);
+				//if(LOG_SCU) logerror("Indirect Mode DMA lv %d set\n",DMA_CH);
 				if(!DWUP(DMA_CH)) state->m_scu.index[DMA_CH] = state->m_scu.dst[DMA_CH];
 			}
 
diff --git a/src/mame/machine/stvcd.c b/src/mame/machine/stvcd.c
index 65aff080d5b..699b3583eb0 100644
--- a/src/mame/machine/stvcd.c
+++ b/src/mame/machine/stvcd.c
@@ -26,6 +26,7 @@
 #include "cdrom.h"
 #include "stvcd.h"
 #include "sound/cdda.h"
+#include "debugger.h"
 
 // super-verbose
 #if 0
@@ -892,6 +893,11 @@ static void cd_writeWord(running_machine &machine, UINT32 addr, UINT16 data)
 			hirqreg |= CMOK|DRDY;
 			break;
 
+		/* these are ERRORS from our core and mustn't happen! */
+		case 0x2100:
+		case 0x2300:
+			debugger_break(machine);
+			break;
 
 		case 0x3000:	// Set CD Device connection
 			{
@@ -1301,8 +1307,9 @@ static void cd_writeWord(running_machine &machine, UINT32 addr, UINT16 data)
 			break;
 
 		case 0x6400:    // put sector data
-			/* TODO: Dungeon Master Nexus trips this */
+			/* TODO: After Burner 2 and Dungeon Master Nexus trips this */
 			// ...
+
 			hirqreg |= (CMOK|EHST);
 			break;