diff --git a/src/mame/drivers/system1.c b/src/mame/drivers/system1.c
index b90f9cbb1e0..01555d0cf73 100644
--- a/src/mame/drivers/system1.c
+++ b/src/mame/drivers/system1.c
@@ -631,7 +631,9 @@ static WRITE8_HANDLER( nob_mcu_control_p2_w )
 
 	/* bit 3 is toggled once at the start of an IRQ, and again at the end */
 	if (((mcu_control ^ data) & 0x08) && !(data & 0x08))
-		;//logerror("MCU IRQ(8) toggle\n");
+	{
+		//logerror("MCU IRQ(8) toggle\n");
+	}
 
 	mcu_control = data;
 }
diff --git a/src/mame/machine/snesdsp1.c b/src/mame/machine/snesdsp1.c
index 06c37e01f26..3680bf32bbc 100644
--- a/src/mame/machine/snesdsp1.c
+++ b/src/mame/machine/snesdsp1.c
@@ -1359,9 +1359,9 @@ static void DSP1_project(INT16 *input, INT16 *output)
    Py=shiftR(Py,E-refE);
    Pz=shiftR(Pz,E3-refE);
 
-   C11=- (Px*shared.Nx>>15);
-   C8=- (Py*shared.Ny>>15);
-   C9=- (Pz*shared.Nz>>15);
+   C11= -(Px*shared.Nx>>15);
+   C8= -(Py*shared.Ny>>15);
+   C9= -(Pz*shared.Nz>>15);
    C12=C11+C8+C9;   // this cannot overflow!
 
    aux4=C12;   // de-normalization with 32-bits arithmetic
diff --git a/src/mame/video/dec8.c b/src/mame/video/dec8.c
index 401be2d4043..fafbae48d5a 100644
--- a/src/mame/video/dec8.c
+++ b/src/mame/video/dec8.c
@@ -363,7 +363,7 @@ static void draw_sprites2( running_machine* machine, bitmap_t *bitmap, const rec
 			if (fy) fy = 0; else fy = 1;
 			mult = 16;
 		}
-		else mult =- 16;
+		else mult = -16;
 
 		while (multi >= 0)
 		{
diff --git a/src/mame/video/twincobr.c b/src/mame/video/twincobr.c
index 53b5bfc9718..228980c0805 100644
--- a/src/mame/video/twincobr.c
+++ b/src/mame/video/twincobr.c
@@ -320,9 +320,9 @@ WRITE8_HANDLER( wardner_exscroll_w )	/* Extra unused video layer */
 {
 	switch (offset)
 	{
-		case 01:	data <<= 8;
+		case 01:	//data <<= 8;
 		case 00:	logerror("PC - write %04x to unknown video scroll X register\n",data); break;
-		case 03:	data <<= 8;
+		case 03:	//data <<= 8;
 		case 02:	logerror("PC - write %04x to unknown video scroll Y register\n",data); break;
 	}
 }