diff --git a/src/mame/audio/cps3.c b/src/mame/audio/cps3.c
index a98f4df3f04..301e264f7be 100644
--- a/src/mame/audio/cps3.c
+++ b/src/mame/audio/cps3.c
@@ -162,7 +162,8 @@ WRITE32_DEVICE_HANDLER( cps3_sound_w )
 	}
 	else
 	{
-		printf("Sound [%x] %x\n", offset, data);
+		// during boot: Sound [84] 230000
+		logerror("Sound [%x] %x\n", offset, data);
 	}
 }
 
@@ -181,7 +182,7 @@ READ32_DEVICE_HANDLER( cps3_sound_r )
 	}
 	else
 	{
-		printf("Unk sound read : %x\n", offset);
+		logerror("Unk sound read : %x\n", offset);
 		return 0;
 	}
 }
diff --git a/src/mame/drivers/cps3.c b/src/mame/drivers/cps3.c
index 8d48f0b13be..272d210f345 100644
--- a/src/mame/drivers/cps3.c
+++ b/src/mame/drivers/cps3.c
@@ -1661,7 +1661,8 @@ static WRITE32_HANDLER( cram_gfxflash_bank_w )
 
 	if (ACCESSING_BITS_0_7)
 	{
-	/*  if(DEBUG_PRINTF)*/ printf("cram_gfxflash_bank_LSB_w LSB32 %08x\n",data);
+		// writes 0 during boot
+		//printf("cram_gfxflash_bank_LSB_w LSB32 %08x\n",data);
 	}
 }
 
@@ -2080,7 +2081,8 @@ static void cps3_process_character_dma(running_machine &machine, UINT32 address)
 		}
 		else
 		{
-			printf("Unknown DMA List Command Type\n"); // warzard uses command 0, uncompressed? but for what?
+			// warzard uses command 0, uncompressed? but for what?
+			//printf("Unknown DMA List Command Type\n");
 		}
 
 	}