diff --git a/rtl/display.v b/rtl/display.v
index 39dee04..4b9df69 100644
--- a/rtl/display.v
+++ b/rtl/display.v
@@ -184,7 +184,7 @@ module display (
     assign cursor = {v_cursor, h_cursor};
     assign vram_r_addr = {vram_v_addr, vram_h_addr};
 	 
-	 wire [5:0] cursor_character = cursor_on ? 6'd0 : 6'd32;
+	 wire [5:0] cursor_character = cursor_on ? 6'd0 : 6'd32;   // "@" or space
 
     assign font_char = (vram_r_addr != cursor) ? vram_dout : cursor_character;
     assign font_pixel = h_dot;     
@@ -220,11 +220,12 @@ module display (
         else
         if(pixel_clken) begin
             vram_w_en <= 0;
+				
+				// accepts a new character only at the start of each frame
 				if(v_cnt == 0 && h_cnt == 0) 
 				   ready <= 1;
 
-            if (clr_screen)
-            begin
+            if(clr_screen) begin
                 // return to top of screen
                 h_cursor <= 6'd0;
                 v_cursor <= 5'd0;
@@ -237,55 +238,41 @@ module display (
                 vram_din <= 6'd32;
                 vram_w_en <= 1;
             end
-            else
-            begin
+            else begin
                 // cursor overflow handling
-                if (h_cursor == 6'd40)
-                begin
+                if (h_cursor == 6'd40) begin
                     h_cursor <= 6'd0;
                     v_cursor <= v_cursor + 'd1;
                 end
 
-                if (v_cursor == vram_end_addr)
-                begin
+                if (v_cursor == vram_end_addr) begin
                     vram_start_addr <= vram_start_addr + 'd1;
                     vram_end_addr <= vram_end_addr + 'd1;
                 end
 
-                if (address == 1'b0) // address low == TX register
-                begin
-                    if (cpu_clken & w_en & ready)
-                    begin
+					 // address low == TX register
+                if (address == 1'b0) begin
+                    if (cpu_clken & w_en & ready) begin
                         // incoming character                        
 					         ready <= 0;			
-
-                        case(din)
-                        8'h0D,
-                        8'h8D: begin
-                            // handle carriage return
-                            h_cursor <= 0;
-                            v_cursor <= v_cursor + 'd1;
-                        end
-
-                        8'h00,
-                        8'h0A,
-                        8'h9B,
-                        8'h7F: begin
-                            // ignore the escape key
-                            h_cursor <= 0;
-                        end
-
-                        default: begin
+								
+								if(din[6:0]=='h0D) begin
+									 // handle carriage return
+									 h_cursor <= 0;
+									 v_cursor <= v_cursor + 'd1;
+								end 
+								else if(din[6:0] < 32) begin
+								    // 0-31 non printable characters, do nothing
+								end								
+								else begin
                             vram_w_addr <= cursor;
                             vram_din <= {~din[6], din[4:0]};
                             vram_w_en <= 1;
                             h_cursor <= h_cursor + 1;
-                        end
-                        endcase
+                        end                        
                     end                    
                 end
-                else
-                begin
+                else begin
                     vram_w_addr <= {vram_clr_addr, vram_h_addr};
                     vram_din <= 6'd32;
                     vram_w_en <= 1;