diff --git a/.gitignore b/.gitignore
index f50ae6d..ad961ae 100644
--- a/.gitignore
+++ b/.gitignore
@@ -56,3 +56,4 @@ ValgrindOut.xml
 *.patch
 *.sh
 *.conf
+*.pdf
diff --git a/src/dialogs/print/convenience.c b/src/dialogs/print/convenience.c
index 32b1681..5395cf4 100644
--- a/src/dialogs/print/convenience.c
+++ b/src/dialogs/print/convenience.c
@@ -44,7 +44,7 @@
  	if(!(widget && GTK_IS_V3270(widget)))
 		return errno = EINVAL;
 
-	lib3270_trace_event(v3270_get_session(widget),"print action activated (type=%d)\n",(int) mode);
+	lib3270_write_event_trace(v3270_get_session(widget),"print action activated (type=%d)\n",(int) mode);
 
 	if(!v3270_is_connected(widget))
 		return errno = ENOTCONN;
diff --git a/src/dialogs/print/print.c b/src/dialogs/print/print.c
index 2e81b20..ea8752b 100644
--- a/src/dialogs/print/print.c
+++ b/src/dialogs/print/print.c
@@ -69,27 +69,27 @@
 		{
 		case GTK_PRINT_OPERATION_RESULT_ERROR:
 			debug("%s: Error on print operation",__FUNCTION__);
-			lib3270_trace_event(operation->widget->host,"%s\n",_("Error on print operation"));
+			lib3270_write_event_trace(operation->widget->host,"%s\n",_("Error on print operation"));
 			break;
 
 		case GTK_PRINT_OPERATION_RESULT_APPLY:
 			debug("%s: The print settings should be stored.",__FUNCTION__);
-			lib3270_trace_event(operation->widget->host,"%s\n",_("The print settings should be stored."));
+			lib3270_write_event_trace(operation->widget->host,"%s\n",_("The print settings should be stored."));
 			break;
 
 		case GTK_PRINT_OPERATION_RESULT_CANCEL:
 			debug("%s: The print operation has been canceled, the print settings should not be stored.", __FUNCTION__);
-			lib3270_trace_event(operation->widget->host,"%s\n",_("The print operation has been canceled, the print settings should not be stored."));
+			lib3270_write_event_trace(operation->widget->host,"%s\n",_("The print operation has been canceled, the print settings should not be stored."));
 			break;
 
 		case GTK_PRINT_OPERATION_RESULT_IN_PROGRESS:
 			debug("%s: The print operation is running",__FUNCTION__);
-			lib3270_trace_event(operation->widget->host,"%s\n",_("The print operation is running"));
+			lib3270_write_event_trace(operation->widget->host,"%s\n",_("The print operation is running"));
 			break;
 
 		default:
 			debug("Unexpected status %d in print operation",(int) result);
-			lib3270_trace_event(operation->widget->host,_("Unexpected status %d in print operation"),(int) result);
+			lib3270_write_event_trace(operation->widget->host,_("Unexpected status %d in print operation"),(int) result);
 
 		}
 
diff --git a/src/terminal/drawing/draw.c b/src/terminal/drawing/draw.c
index beee516..c85e6ea 100644
--- a/src/terminal/drawing/draw.c
+++ b/src/terminal/drawing/draw.c
@@ -40,6 +40,7 @@
  #include <lib3270/session.h>
  #include <lib3270/toggle.h>
  #include <internals.h>
+ #include <lib3270/trace.h>
 
  #include <v3270.h>
  #include <terminal.h>
@@ -256,6 +257,7 @@ static void draw_small_text(cairo_t *cr, const GdkRectangle *rect, v3270FontInfo
 
 static gboolean draw_cg(cairo_t *cr, unsigned char chr, v3270FontInfo *font, GdkRectangle *rect)
 {
+	// https://unicode.org/charts/PDF/U2300.pdf
 	static const struct CharList
 	{
 		unsigned char chr;
@@ -350,25 +352,25 @@ void v3270_draw_char(cairo_t *cr, unsigned char chr, unsigned short attr, H3270 
 			cairo_rel_line_to(cr,0,rect->height);
 			break;
 
-		case 0xd4: // CG 0xac, LR corner
+		case 0xd4: // CG 0xac, LR corner ⌟
 			cairo_move_to(cr,rect->x, rect->y+(rect->height/2));
 			cairo_rel_line_to(cr,rect->width/2,0);
 			cairo_rel_line_to(cr,0,-(rect->height/2));
 			break;
 
-		case 0xd5: // CG 0xad, UR corner
+		case 0xd5: // CG 0xad, UR corner ⌝
 			cairo_move_to(cr,rect->x, rect->y+(rect->height/2));
 			cairo_rel_line_to(cr,rect->width/2,0);
 			cairo_rel_line_to(cr,0,rect->height/2);
 			break;
 
-		case 0xc5: // CG 0xa4, UL corner
+		case 0xc5: // CG 0xa4, UL corner ⌜
 			cairo_move_to(cr,rect->x+rect->width,rect->y+(rect->height/2));
 			cairo_rel_line_to(cr,-(rect->width/2),0);
 			cairo_rel_line_to(cr,0,(rect->height/2));
 			break;
 
-		case 0xc4: // CG 0xa3, LL corner
+		case 0xc4: // CG 0xa3, LL corner ⌞
 			cairo_move_to(cr,rect->x+rect->width,rect->y+(rect->height/2));
 			cairo_rel_line_to(cr,-(rect->width/2),0);
 			cairo_rel_line_to(cr,0,-(rect->height/2));
@@ -405,7 +407,10 @@ void v3270_draw_char(cairo_t *cr, unsigned char chr, unsigned short attr, H3270 
 		default:
 
 			if(!draw_cg(cr, chr, font, rect))
+			{
+				lib3270_write_screen_trace(session,"I don't known how to draw CG character %02x\n",(int) chr);
 				cairo_rectangle(cr, rect->x+1, rect->y+1, rect->width-2, rect->height-2);
+			}
 
 		}
 	}
diff --git a/src/terminal/scroll.c b/src/terminal/scroll.c
index eb591de..0a52d08 100644
--- a/src/terminal/scroll.c
+++ b/src/terminal/scroll.c
@@ -45,15 +45,15 @@ gboolean v3270_scroll_event(GtkWidget *widget, GdkEventScroll *event)
 {
 	v3270 * terminal = GTK_V3270(widget);
 
-	lib3270_trace_event(terminal->host,"scroll event direction=%d",(int) event->direction);
+	lib3270_write_event_trace(terminal->host,"scroll event direction=%d",(int) event->direction);
 
 	if(lib3270_get_program_message(terminal->host) != LIB3270_MESSAGE_NONE || event->direction < 0 || event->direction > G_N_ELEMENTS(terminal->scroll))
 	{
-		lib3270_trace_event(terminal->host,"  dropped (not available)\n");
+		lib3270_write_event_trace(terminal->host,"  dropped (not available)\n");
 		return FALSE;
 	}
 
-	lib3270_trace_event(terminal->host,"\n");
+	lib3270_write_event_trace(terminal->host,"\n");
 
 	debug("%d %p", (int) event->direction, terminal->scroll[event->direction]);
 
--
libgit2 0.21.2