diff --git a/src/emu/cpu/mips/mips3.c b/src/emu/cpu/mips/mips3.c
index 2c542bb2683..b7752a60130 100644
--- a/src/emu/cpu/mips/mips3.c
+++ b/src/emu/cpu/mips/mips3.c
@@ -1990,11 +1990,11 @@ CPU_EXECUTE( mips3 )
 					case 0x02:  /* BLTZL */     if ((INT64)RSVAL64 < 0) ADDPC(SIMMVAL); else mips3.core.pc += 4;        break;
 					case 0x03:  /* BGEZL */     if ((INT64)RSVAL64 >= 0) ADDPC(SIMMVAL); else mips3.core.pc += 4;   break;
 					case 0x08:  /* TGEI */      if ((INT64)RSVAL64 >= SIMMVAL) generate_exception(EXCEPTION_TRAP, 1);   break;
-					case 0x09:  /* TGEIU */     if (RSVAL64 >= SIMMVAL) generate_exception(EXCEPTION_TRAP, 1);  break;
+					case 0x09:  /* TGEIU */     if (RSVAL64 >= UIMMVAL) generate_exception(EXCEPTION_TRAP, 1);  break;
 					case 0x0a:  /* TLTI */      if ((INT64)RSVAL64 < SIMMVAL) generate_exception(EXCEPTION_TRAP, 1);    break;
-					case 0x0b:  /* TLTIU */     if (RSVAL64 >= SIMMVAL) generate_exception(EXCEPTION_TRAP, 1);  break;
-					case 0x0c:  /* TEQI */      if (RSVAL64 == SIMMVAL) generate_exception(EXCEPTION_TRAP, 1);  break;
-					case 0x0e:  /* TNEI */      if (RSVAL64 != SIMMVAL) generate_exception(EXCEPTION_TRAP, 1);  break;
+					case 0x0b:  /* TLTIU */     if (RSVAL64 >= UIMMVAL) generate_exception(EXCEPTION_TRAP, 1);  break;
+					case 0x0c:  /* TEQI */      if (RSVAL64 == UIMMVAL) generate_exception(EXCEPTION_TRAP, 1);  break;
+					case 0x0e:  /* TNEI */      if (RSVAL64 != UIMMVAL) generate_exception(EXCEPTION_TRAP, 1);  break;
 					case 0x10:  /* BLTZAL */    if ((INT64)RSVAL64 < 0) ADDPCL(SIMMVAL,31);                     break;
 					case 0x11:  /* BGEZAL */    if ((INT64)RSVAL64 >= 0) ADDPCL(SIMMVAL,31);                    break;
 					case 0x12:  /* BLTZALL */   if ((INT64)RSVAL64 < 0) ADDPCL(SIMMVAL,31) else mips3.core.pc += 4; break;
@@ -2029,7 +2029,7 @@ CPU_EXECUTE( mips3 )
 			case 0x16:  /* BLEZL */     if ((INT64)RSVAL64 <= 0) ADDPC(SIMMVAL); else mips3.core.pc += 4;           break;
 			case 0x17:  /* BGTZL */     if ((INT64)RSVAL64 > 0) ADDPC(SIMMVAL); else mips3.core.pc += 4;                break;
 			case 0x18:  /* DADDI */
-				if (ENABLE_OVERFLOWS && RSVAL64 > ~SIMMVAL) generate_exception(EXCEPTION_OVERFLOW, 1);
+				if (ENABLE_OVERFLOWS && (INT64)RSVAL64 > ~SIMMVAL) generate_exception(EXCEPTION_OVERFLOW, 1);
 				else if (RTREG) RTVAL64 = RSVAL64 + (INT64)SIMMVAL;
 				break;
 			case 0x19:  /* DADDIU */    if (RTREG) RTVAL64 = RSVAL64 + (UINT64)SIMMVAL;                         break;
diff --git a/src/emu/video/fixfreq.c b/src/emu/video/fixfreq.c
index eb9c47ecd7c..281bb22e635 100644
--- a/src/emu/video/fixfreq.c
+++ b/src/emu/video/fixfreq.c
@@ -242,11 +242,18 @@ void fixedfreq_device::update_vid(double newval, attotime cur_time)
 		bm->plot_box(m_last_x, m_last_y + m_sig_field, pixels - m_last_x, 1, col);
 		m_last_x = pixels;
 	}
-	if (sync & 1) VERBOSE_OUT(("VSYNC %d %d\n", pixels, m_last_y + m_sig_field));
+	if (sync & 1)
+	{
+		VERBOSE_OUT(("VSYNC %d %d\n", pixels, m_last_y + m_sig_field));
+	}
 	if (sync & 2)
+	{
 		VERBOSE_OUT(("HSYNC up %d\n", pixels));
+	}
 	if (sync & 4)
+	{
 		VERBOSE_OUT(("HSYNC down %f %d %f\n", time.as_double()* 1e6, pixels, m_vid));
+	}
 	//VERBOSE_OUT(("%d\n", m_last_x);
 
 	if (sync & 1)
diff --git a/src/mess/tools/imgtool/modules/bml3.c b/src/mess/tools/imgtool/modules/bml3.c
index 5cf30310976..d7efba94f78 100644
--- a/src/mess/tools/imgtool/modules/bml3.c
+++ b/src/mess/tools/imgtool/modules/bml3.c
@@ -704,7 +704,6 @@ static imgtoolerr_t bml3_diskimage_writefile(imgtool_partition *partition, const
 	size_t i;
 	UINT64 sz, read_sz;
 	UINT64 freespace = 0;
-	unsigned char g;
 	unsigned char *gptr;
 	UINT8 granule_count;
 	UINT8 granule_map[MAX_GRANULEMAP_SIZE];
@@ -744,7 +743,8 @@ static imgtoolerr_t bml3_diskimage_writefile(imgtool_partition *partition, const
 	if (ferr)
 		return imgtool_floppy_error(ferr);
 
-	g = 0x00;
+	unsigned char g = 0x00;
+	UINT32 granule_bytes = info->granule_sectors * info->sector_size;
 
 	do
 	{
@@ -758,7 +758,7 @@ static imgtoolerr_t bml3_diskimage_writefile(imgtool_partition *partition, const
 		gptr = &granule_map[g];
 
 
-		i = MIN(read_sz, info->granule_sectors * info->sector_size);
+		i = MIN(read_sz, granule_bytes);
 		if (i > 0) {
 			err = transfer_to_granule(img, g, i, sourcef);
 			if (err)
diff --git a/src/mess/tools/imgtool/modules/ti99.c b/src/mess/tools/imgtool/modules/ti99.c
index d0e643f3454..8e200d7db89 100644
--- a/src/mess/tools/imgtool/modules/ti99.c
+++ b/src/mess/tools/imgtool/modules/ti99.c
@@ -968,7 +968,7 @@ static imgtoolerr_t open_image_lvl1(imgtool_stream *file_handle, ti99_img_format
 {
 	imgtoolerr_t err;
 	int reply;
-	int totphysrecs;
+	UINT16 totphysrecs;
 
 
 	l1_img->img_format = img_format;
@@ -1030,7 +1030,7 @@ static imgtoolerr_t open_image_lvl1(imgtool_stream *file_handle, ti99_img_format
 				|| (totphysrecs < 2)
 				|| memcmp(vib->id, "DSK", 3) || (! strchr(" P", vib->protection))
 				|| (((img_format == if_mess) || (img_format == if_v9t9))
-					&& (stream_size(file_handle) != totphysrecs*256)))
+					&& (stream_size(file_handle) != totphysrecs*256U)))
 			return (imgtoolerr_t)IMGTOOLERR_CORRUPTIMAGE;
 
 		if ((img_format == if_pc99_fm) || (img_format == if_pc99_mfm))
diff --git a/src/mess/tools/imgtool/modules/vzdos.c b/src/mess/tools/imgtool/modules/vzdos.c
index c724d7901e2..ae9c259c90d 100644
--- a/src/mess/tools/imgtool/modules/vzdos.c
+++ b/src/mess/tools/imgtool/modules/vzdos.c
@@ -498,7 +498,7 @@ static imgtoolerr_t vzdos_diskimage_readfile(imgtool_partition *partition, const
 		if (ret) return ret;
 
 		/* detect sectors pointing to themselfs */
-		if ((track == pick_integer_le(buffer, DATA_SIZE, 1)) && (sector == pick_integer_le(buffer, DATA_SIZE + 1, 1)))
+		if ((track == (int)pick_integer_le(buffer, DATA_SIZE, 1)) && (sector == (int)pick_integer_le(buffer, DATA_SIZE + 1, 1)))
 			return IMGTOOLERR_CORRUPTIMAGE;
 
 		/* load next track and sector values */