diff --git a/user/ansi_parser_callbacks.c b/user/ansi_parser_callbacks.c
index 0aa64ea..712ef04 100644
--- a/user/ansi_parser_callbacks.c
+++ b/user/ansi_parser_callbacks.c
@@ -267,19 +267,19 @@ apars_handle_CSI(char leadchar, int *params, char keychar)
 			break;
 
 		case 'L':
-			// TODO insert line
+			screen_insert_lines(n1);
 			break;
 
 		case 'M':
-			// TODO delete line
+			screen_delete_lines(n1);
 			break;
 
 		case '@':
-			// TODO insert character (in line)
+			screen_insert_characters(n1);
 			break;
 
 		case 'P':
-			// TODO delete character (in line)
+			screen_delete_characters(n1);
 			break;
 	}
 }
diff --git a/user/screen.c b/user/screen.c
index 0cc86f8..17bbcea 100644
--- a/user/screen.c
+++ b/user/screen.c
@@ -276,6 +276,34 @@ screen_fill_with_E(void)
 
 //region Screen manipulation
 
+void screen_insert_lines(unsigned int lines)
+{
+	NOTIFY_LOCK();
+	// TODO
+	NOTIFY_DONE();
+}
+
+void screen_delete_lines(unsigned int lines)
+{
+	NOTIFY_LOCK();
+	// TODO
+	NOTIFY_DONE();
+}
+
+void screen_insert_characters(unsigned int count)
+{
+	NOTIFY_LOCK();
+	// TODO
+	NOTIFY_DONE();
+}
+
+void screen_delete_characters(unsigned int count)
+{
+	NOTIFY_LOCK();
+	// TODO
+	NOTIFY_DONE();
+}
+
 /**
  * Change the screen size
  *
diff --git a/user/screen.h b/user/screen.h
index b2d93f0..705b4bf 100644
--- a/user/screen.h
+++ b/user/screen.h
@@ -122,6 +122,12 @@ void screen_scroll_down(unsigned int lines);
 /** esc # 8 - fill entire screen with E of default colors */
 void screen_fill_with_E(void);
 
+// --- insert / delete ---
+void screen_insert_lines(unsigned int lines);
+void screen_delete_lines(unsigned int lines);
+void screen_insert_characters(unsigned int count);
+void screen_delete_characters(unsigned int count);
+
 // --- Cursor control ---
 
 /** Set cursor position */