--- previous/src/convert/high640x8.c	2018/04/24 19:28:28	1.1.1.2
+++ previous/src/convert/high640x8.c	2018/04/24 19:29:34	1.1.1.3
@@ -72,33 +72,66 @@ static void ConvertHighRes_640x8Bit(void
 			colors[x] = SDL_MapRGB(sdlscrn->format, sdlColors[x].r, sdlColors[x].g, sdlColors[x].b);
 	}
 
-	for (y = 0; y < 832; y++)
-	{
+	if (ConfigureParams.System.bTurbo) {
+		for (y = 0; y < 832; y++)
+		{
 
-		for (x = 0; x < 1120; x++)
+			for (x = 0; x < 1120; x++)
+			{
+				switch (x&0x3)
+				{
+				case 0x0:
+					col=(NEXTVideo[(x/4)+y*280]&0xC0)>>6;
+					break;
+				case 0x1:
+					col=(NEXTVideo[(x/4)+y*280]&0x30)>>4;
+					break;
+				case 0x2:
+					col=(NEXTVideo[(x/4)+y*280]&0x0C)>>2;
+					break;
+				case 0x3:
+					col=(NEXTVideo[(x/4)+y*280]&0x03);
+					break;
+				}
+		    /* Hack to provide video output on color systems to  *
+		     * do memory configuration experiments. Remove later */
+		    if (ConfigureParams.System.bColor) {
+		        col = (NEXTColorVideo[(x*2)+(y*280*8)]&0x30)>>4;
+		    }
+		    /* --------------------------------------------------*/
+				putpixel(sdlscrn,x,y,col);
+			}
+		}
+	}
+	else {
+		for (y = 0; y < 832; y++)
 		{
-			switch (x&0x3)
+
+			for (x = 0; x < 1120; x++)
 			{
-			case 0x0:
-				col=(NEXTVideo[(x/4)+y*288]&0xC0)>>6;
-				break;
-			case 0x1:
-				col=(NEXTVideo[(x/4)+y*288]&0x30)>>4;
-				break;
-			case 0x2:
-				col=(NEXTVideo[(x/4)+y*288]&0x0C)>>2;
-				break;
-			case 0x3:
-				col=(NEXTVideo[(x/4)+y*288]&0x03);
-				break;
+				switch (x&0x3)
+				{
+				case 0x0:
+					col=(NEXTVideo[(x/4)+y*288]&0xC0)>>6;
+					break;
+				case 0x1:
+					col=(NEXTVideo[(x/4)+y*288]&0x30)>>4;
+					break;
+				case 0x2:
+					col=(NEXTVideo[(x/4)+y*288]&0x0C)>>2;
+					break;
+				case 0x3:
+					col=(NEXTVideo[(x/4)+y*288]&0x03);
+					break;
+				}
+		    /* Hack to provide video output on color systems to  *
+		     * do memory configuration experiments. Remove later */
+		    if (ConfigureParams.System.bColor) {
+		        col = (NEXTColorVideo[(x*2)+(y*288*8)]&0x30)>>4;
+		    }
+		    /* --------------------------------------------------*/
+				putpixel(sdlscrn,x,y,col);
 			}
-            /* Hack to provide video output on color systems to  *
-             * do memory configuration experiments. Remove later */
-            if (ConfigureParams.System.bColor) {
-                col = (NEXTColorVideo[(x*2)+(y*288*8)]&0x30)>>4;
-            }
-            /* --------------------------------------------------*/
-			putpixel(sdlscrn,x,y,col);
 		}
 	}
 }