diff --git a/include/vga.h b/include/vga.h
index 55abf2f8..1de2b8c9 100644
--- a/include/vga.h
+++ b/include/vga.h
@@ -262,7 +262,12 @@ typedef struct {
 	Bit8u color_plane_enable;
 	Bit8u color_select;
 	Bit8u index;
-	Bit8u enabled;
+	Bit8u disabled; // Used for disabling the screen.
+					// Bit0: screen disabled by attribute controller index
+					// Bit1: screen disabled by sequencer index 1 bit 5
+					// These are put together in one variable for performance reasons:
+					// the line drawing function is called maybe 60*480=28800 times/s,
+					// and we only need to check one variable for zero this way.
 } VGA_Attr;
 
 typedef struct {
diff --git a/src/hardware/vga_attr.cpp b/src/hardware/vga_attr.cpp
index 1f1371b0..9f23b509 100644
--- a/src/hardware/vga_attr.cpp
+++ b/src/hardware/vga_attr.cpp
@@ -46,7 +46,7 @@ void VGA_ATTR_SetPalette(Bit8u index,Bit8u val) {
 Bitu read_p3c0(Bitu /*port*/,Bitu /*iolen*/) {
 	// Wcharts, Win 3.11 & 95 SVGA
 	Bitu retval = attr(index) & 0x1f;
-	if (attr(enabled)) retval |= 0x20;
+	if (!(attr(disabled) & 0x1)) retval |= 0x20;
 	return retval;
 }
  
@@ -54,7 +54,8 @@ void write_p3c0(Bitu /*port*/,Bitu val,Bitu iolen) {
 	if (!vga.internal.attrindex) {
 		attr(index)=val & 0x1F;
 		vga.internal.attrindex=true;
-		attr(enabled)=val & 0x20;
+		if (val & 0x20) attr(disabled) &= ~1;
+		else attr(disabled) |= 1;
 		/* 
 			0-4	Address of data register to write to port 3C0h or read from port 3C1h
 			5	If set screen output is enabled and the palette can not be modified,
@@ -69,7 +70,7 @@ void write_p3c0(Bitu /*port*/,Bitu val,Bitu iolen) {
 		case 0x04:		case 0x05:		case 0x06:		case 0x07:
 		case 0x08:		case 0x09:		case 0x0a:		case 0x0b:
 		case 0x0c:		case 0x0d:		case 0x0e:		case 0x0f:
-			if (!attr(enabled)) VGA_ATTR_SetPalette(attr(index),(Bit8u)val);
+			if (attr(disabled) & 0x1) VGA_ATTR_SetPalette(attr(index),(Bit8u)val);
 			/*
 				0-5	Index into the 256 color DAC table. May be modified by 3C0h index
 				10h and 14h.
diff --git a/src/hardware/vga_draw.cpp b/src/hardware/vga_draw.cpp
index f24c5d78..a12d9580 100644
--- a/src/hardware/vga_draw.cpp
+++ b/src/hardware/vga_draw.cpp
@@ -637,15 +637,13 @@ static void VGA_ProcessSplit() {
 }
 
 static void VGA_DrawSingleLine(Bitu /*blah*/) {
-	if (vga.attr.enabled) {
-        Bit8u * data=VGA_DrawLine( vga.draw.address, vga.draw.address_line );	
-		RENDER_DrawLine(data);
-	} else {
-		// else draw overscan color line
-		// TODO: black line should be good enough for now
-		// (DoWhackaDo)
+	if (GCC_UNLIKELY(vga.attr.disabled)) {
+		// draw blanked line (DoWhackaDo, Alien Carnage, TV sports Football)
 		memset(TempLine, 0, sizeof(TempLine));
 		RENDER_DrawLine(TempLine);
+	} else {
+		Bit8u * data=VGA_DrawLine( vga.draw.address, vga.draw.address_line );	
+		RENDER_DrawLine(data);
 	}
 
 	vga.draw.address_line++;
diff --git a/src/hardware/vga_other.cpp b/src/hardware/vga_other.cpp
index 80143d4f..47b47b14 100644
--- a/src/hardware/vga_other.cpp
+++ b/src/hardware/vga_other.cpp
@@ -522,7 +522,7 @@ Bitu read_herc_status(Bitu /*port*/,Bitu /*iolen*/) {
 void VGA_SetupOther(void) {
 	Bitu i;
 	memset( &vga.tandy, 0, sizeof( vga.tandy ));
-	vga.attr.enabled = true;
+	vga.attr.disabled = 0;
 	vga.config.bytes_skip=0;
 
 	//Initialize values common for most machines, can be overwritten
diff --git a/src/hardware/vga_s3.cpp b/src/hardware/vga_s3.cpp
index c656a4d0..3d428788 100644
--- a/src/hardware/vga_s3.cpp
+++ b/src/hardware/vga_s3.cpp
@@ -355,7 +355,7 @@ Bitu SVGA_S3_ReadCRTC( Bitu reg, Bitu iolen) {
 	switch (reg) {
 	case 0x24:	/* attribute controller index (read only) */
 	case 0x26:
-		return (vga.attr.enabled?0x20:0x00) | (vga.attr.index&0x1f);
+		return ((vga.attr.disabled & 1)?0x00:0x20) | (vga.attr.index & 0x1f);
 	case 0x2d:	/* Extended Chip ID (high byte of PCI device ID) */
 		return 0x88;
 	case 0x2e:	/* New Chip ID  (low byte of PCI device ID) */
diff --git a/src/hardware/vga_seq.cpp b/src/hardware/vga_seq.cpp
index 33a6604d..edd400a4 100644
--- a/src/hardware/vga_seq.cpp
+++ b/src/hardware/vga_seq.cpp
@@ -47,6 +47,8 @@ void write_p3c5(Bitu /*port*/,Bitu val,Bitu iolen) {
 			} else {
 				seq(clocking_mode)=val;
 			}
+			if (val & 0x20) vga.attr.disabled |= 0x2;
+			else vga.attr.disabled &= ~0x2;
 		}
 		/* TODO Figure this out :)
 			0	If set character clocks are 8 dots wide, else 9.