diff -r 189f695d0b02 -r 4c2b92281cdc emul/mini/src/main/resources/org/apidesign/vm4brwsr/emul/lang/java_lang_Number.js
--- a/emul/mini/src/main/resources/org/apidesign/vm4brwsr/emul/lang/java_lang_Number.js	Thu Jan 31 15:26:09 2013 +0100
+++ b/emul/mini/src/main/resources/org/apidesign/vm4brwsr/emul/lang/java_lang_Number.js	Thu Jan 31 20:19:38 2013 +0100
@@ -91,6 +91,7 @@
 
 Number.prototype.and64 = function(x) {
     var low = this & x;
+    low += (low < 0) ? (__m32+1) : 0;
     if (this.hi && x.hi) {
         var hi = this.hi & x.hi;
         return hi.next32(low);
@@ -98,6 +99,16 @@
     return low;
 };
 
+Number.prototype.or64 = function(x) {
+    var low = this | x;
+    low += (low < 0) ? (__m32+1) : 0;
+    if (this.hi || x.hi) {
+        var hi = this.hi | x.hi;
+        return hi.next32(low);
+    };
+    return low;
+};
+
 Number.prototype.shl64 = function(x) {
     if (x >= 32) {
         var hi = (this << (x - 32)) | 0;