diff --git a/assets/basic.js b/assets/basic.js
index b5cb60e..d93f2b4 100644
--- a/assets/basic.js
+++ b/assets/basic.js
@@ -1090,6 +1090,11 @@ if no arg text were given (e.g. "10 NEXT"), args will have zero length
         return akku;
     });
 },
+/* GOTO and GOSUB won't work but that's probably the best...? */
+"DO" : function(lnum, args) {
+    //return resolve(args[args.length - 1]);
+    return undefined;
+},
 "OPTIONDEBUG" : function(lnum, args) {
     return oneArgNum(lnum, args, (lh) => {
         if (lh != 0 && lh != 1) throw lang.syntaxfehler(line);
diff --git a/assets/dotest.bas b/assets/dotest.bas
new file mode 100644
index 0000000..8265950
--- /dev/null
+++ b/assets/dotest.bas
@@ -0,0 +1,3 @@
+10 DEFUN KA(X)=IF X>2 THEN DO(PRINT("HAI");PRINT(X)) ELSE DO(PRINT("BYE");PRINT(X))
+20 INPUT N
+30 KA(N)
diff --git a/assets/maptest.bas b/assets/maptest.bas
deleted file mode 100644
index e69de29..0000000