diff --git a/src/top.v b/src/top.v
index d88d900..b2f50b3 100644
--- a/src/top.v
+++ b/src/top.v
@@ -25,6 +25,13 @@ module proc_top(
 
 /* Color bar generator */
 
+parameter CB_HRES = 1280;
+parameter CB_VRES = 720;
+parameter CB_H_FP = 68;
+parameter CB_H_BP = 300;
+parameter CB_V_FP = 25;
+parameter CB_V_BP = 5;
+
 reg [11:0] cb_x = 0;
 reg [11:0] cb_y = 0;
 reg [11:0] cb_cnt = 0;
@@ -43,39 +50,55 @@ assign out_green = cb_green;
 assign out_blue = cb_blue;
 
 always @(posedge clk) begin
-	cb_red   <= 8'hff;
-	cb_green <= 8'h00;
-	cb_blue  <= 8'h00;
-
-	if (cb_x == 1279) begin
-		cb_blank <= 1;
-	end else if (cb_x == 1648-1 && (cb_y == 749 || cb_y < 719)) begin
-		cb_blank <= 0;
-	end
+	cb_x <= cb_x + 1;
 	
-	if (cb_x == 1280+72-1) begin
-		cb_hsync <= 1;
-	end else if (cb_x == 1280+72+80-1) begin
-		cb_hsync <= 0;
-	end
+	cb_hsync <= cb_x >= 8 && cb_x <= 15;
+	cb_vsync <= cb_y >= 4 && cb_y <= 7;
 	
-	if (cb_x == 1648-1) begin
+	if (cb_x == CB_H_FP + CB_HRES + CB_H_BP - 1) begin
 		cb_x <= 0;
+		cb_y <= cb_y + 1;
 		
-		if (cb_y == 720+3-1) begin
-			cb_vsync <= 1;
-		end else if (cb_y == 720+3+5-1) begin
-			cb_vsync <= 0;
-		end
 		
-		if (cb_y == 750-1) begin
+		if (cb_y == CB_V_FP - 1) begin
+			cb_vactive <= 1;
+			
+		end else if (cb_y == CB_V_FP + CB_VRES - 1) begin
+			cb_vactive <= 0;
+			
+		end else if (cb_y == CB_V_FP + CB_VRES + CB_V_BP - 1) begin
 			cb_y <= 0;
-		end else begin
-			cb_y <= cb_y + 1;
 		end
 		
-	end else begin
-		cb_x <= cb_x + 1;
+	end else if (cb_vactive && (cb_x == CB_H_FP - 1)) begin
+		cb_red   <= 0;
+		cb_green <= 0;
+		cb_blue  <= 0;
+		cb_blank <= 0;
+		cb_cnt <= 0;
+		cb_bar <= 0;
+		
+	end else if (cb_vactive && (cb_x == CB_H_FP + CB_HRES - 1)) begin
+		cb_blank <= 1;
+		
+	end
+	
+	if (!cb_blank) begin
+		cb_cnt <= cb_cnt + 1;
+		
+		if (cb_cnt == 255) begin
+			cb_cnt <= 0;
+			cb_bar <= cb_bar + 1;
+			
+			if (cb_bar == 7) begin
+				cb_bar <= 0;
+			end
+			
+			cb_red   <= {8{cb_bar[0]}};
+			cb_green <= {8{cb_bar[1]}};
+			cb_blue  <= {8{cb_bar[2]}};
+		end
+		
 	end
 end