tvdos: cls to clear out secondary fbuf

assets/disk0/tvdos/bin/command.js

@@ -275,6 +275,7 @@ shell.coreutils = {
     cls: function(args) {
         con.clear();
         graphics.clearPixels(255);
+        graphics.clearPixels2(240);
     },
     exit: function(args) {
         cmdExit = true;

assets/disk0/tvdos/bin/telcom.js

@@ -62,7 +62,9 @@ function sendMessage(line) {
         }
     }
     else {
-        com.sendMessage(port - 1, line + "\x17")
+        if (line.charAt(line.length - 1) == '\\')
+            line = line.substring(0, line.length - 1) + '\x17'
+        com.sendMessage(port - 1, line)
         println(com.fetchResponse(port - 1))
     }
 }