diff --git a/src/dos/dev_con.h b/src/dos/dev_con.h
index ef397730..05af1d0a 100644
--- a/src/dos/dev_con.h
+++ b/src/dos/dev_con.h
@@ -44,8 +44,6 @@ private:
 		Bit8u attr;
 		Bit8u data[NUMBER_ANSI_DATA];
 		Bit8u numberofarg;
-		Bit16u nrows;
-		Bit16u ncols;
 		Bit8s savecol;
 		Bit8s saverow;
 		bool warned;
@@ -117,6 +115,7 @@ bool device_CON::Write(Bit8u * data,Bit16u * size) {
 	Bit16u count=0;
 	Bitu i;
 	Bit8u col,row;
+	Bit16u ncols,nrows;
 	Bit8u tempdata;
 	while (*size>count) {
 		if (!ansi.esc){
@@ -273,11 +272,13 @@ bool device_CON::Write(Bit8u * data,Bit16u * size) {
 				ansi.warned = true;
 				LOG(LOG_IOCTL,LOG_WARN)("ANSI SEQUENCES USED");
 			}
+			ncols = real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS);
+			nrows = real_readb(BIOSMEM_SEG,BIOSMEM_NB_ROWS) + 1;
 			/* Turn them into positions that are on the screen */
 			if(ansi.data[0] == 0) ansi.data[0] = 1;
 			if(ansi.data[1] == 0) ansi.data[1] = 1;
-			if(ansi.data[0] > ansi.nrows) ansi.data[0] = (Bit8u)ansi.nrows;
-			if(ansi.data[1] > ansi.ncols) ansi.data[1] = (Bit8u)ansi.ncols;
+			if(ansi.data[0] > nrows) ansi.data[0] = (Bit8u)nrows;
+			if(ansi.data[1] > ncols) ansi.data[1] = (Bit8u)ncols;
 			INT10_SetCursorPos(--(ansi.data[0]),--(ansi.data[1]),page); /*ansi=1 based, int10 is 0 based */
 			ClearAnsi();
 			break;
@@ -294,9 +295,10 @@ bool device_CON::Write(Bit8u * data,Bit16u * size) {
 		case 'B': /*cursor Down */
 			col=CURSOR_POS_COL(page) ;
 			row=CURSOR_POS_ROW(page) ;
+			nrows = real_readb(BIOSMEM_SEG,BIOSMEM_NB_ROWS) + 1;
 			tempdata = (ansi.data[0]? ansi.data[0] : 1);
-			if(tempdata + static_cast<Bitu>(row) >= ansi.nrows)
-				{ row = ansi.nrows - 1;}
+			if(tempdata + static_cast<Bitu>(row) >= nrows)
+				{ row = nrows - 1;}
 			else	{ row += tempdata; }
 			INT10_SetCursorPos(row,col,page);
 			ClearAnsi();
@@ -304,9 +306,10 @@ bool device_CON::Write(Bit8u * data,Bit16u * size) {
 		case 'C': /*cursor forward */
 			col=CURSOR_POS_COL(page);
 			row=CURSOR_POS_ROW(page);
+			ncols = real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS);
 			tempdata=(ansi.data[0]? ansi.data[0] : 1);
-			if(tempdata + static_cast<Bitu>(col) >= ansi.ncols) 
-				{ col = ansi.ncols - 1;} 
+			if(tempdata + static_cast<Bitu>(col) >= ncols) 
+				{ col = ncols - 1;} 
 			else	{ col += tempdata;}
 			INT10_SetCursorPos(row,col,page);
 			ClearAnsi();
@@ -346,15 +349,17 @@ bool device_CON::Write(Bit8u * data,Bit16u * size) {
 		case 'K': /* erase till end of line (don't touch cursor) */
 			col = CURSOR_POS_COL(page);
 			row = CURSOR_POS_ROW(page);
-			INT10_WriteChar(' ',ansi.attr,page,ansi.ncols-col,true); //Use this one to prevent scrolling when end of screen is reached
-			//for(i = col;i<(Bitu) ansi.ncols; i++) INT10_TeletypeOutputAttr(' ',ansi.attr,true);
+			ncols = real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS);
+			INT10_WriteChar(' ',ansi.attr,page,ncols-col,true); //Use this one to prevent scrolling when end of screen is reached
+			//for(i = col;i<(Bitu) ncols; i++) INT10_TeletypeOutputAttr(' ',ansi.attr,true);
 			INT10_SetCursorPos(row,col,page);
 			ClearAnsi();
 			break;
 		case 'M': /* delete line (NANSI) */
-			col = CURSOR_POS_COL(page);
 			row = CURSOR_POS_ROW(page);
-			INT10_ScrollWindow(row,0,ansi.nrows-1,ansi.ncols-1,ansi.data[0]? -ansi.data[0] : -1,ansi.attr,0xFF);
+			ncols = real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS);
+			nrows = real_readb(BIOSMEM_SEG,BIOSMEM_NB_ROWS) + 1;
+			INT10_ScrollWindow(row,0,nrows-1,ncols-1,ansi.data[0]? -ansi.data[0] : -1,ansi.attr,0xFF);
 			ClearAnsi();
 			break;
 		case 'l':/* (if code =7) disable linewrap */
@@ -403,8 +408,6 @@ device_CON::device_CON() {
 	lastwrite=0;
 	ansi.enabled=false;
 	ansi.attr=0x7;
-	ansi.ncols=real_readw(BIOSMEM_SEG,BIOSMEM_NB_COLS); //should be updated once set/reset mode is implemented
-	ansi.nrows=real_readb(BIOSMEM_SEG,BIOSMEM_NB_ROWS) + 1;
 	ansi.saverow=0;
 	ansi.savecol=0;
 	ansi.warned=false;