diff --git a/dell.js b/dell.js
new file mode 100644
index 0000000..8e7653c
--- /dev/null
+++ b/dell.js
@@ -0,0 +1,59 @@
+
+function ord(str){
+    return str.charCodeAt(0);
+}
+
+function StrintToArray(str){
+    var arr = [];
+    for(var i=0;i<str.length;i++){
+        arr[i] = ord(str.charAt(i));
+    }
+    return arr;
+}
+
+function toByte(arr){
+    for(var i=0;i<arr.length;i++){
+        arr[i] = arr[i] & 0xFF;
+    }
+    return arr;
+}
+        
+
+function begin_calc(serial, s_arr){
+    var ret_arr = [];
+    if(typeof(serial)=="string"){
+        serial = StrintToArray(serial);
+    }
+    
+    ret_arr[0] = serial[ s_arr[3] ];
+    ret_arr[1] = ( serial[ s_arr[3] ] >> 5) |
+                 (( (serial[ s_arr[2] ] >> 5) | (serial[ s_arr[2] ] << 3))
+                & 0xF1);
+    ret_arr[2] = (serial[ s_arr[2] ] >> 2);
+    ret_arr[3] = (serial[ s_arr[2] ] >> 7) | (serial[ s_arr[1] ] << 1);
+    ret_arr[4] = (serial[ s_arr[1] ] >> 4) | (serial[ s_arr[0] ] << 4);
+
+
+    ret_arr[5] = (serial[1] >> 1);
+    ret_arr[6] = (serial[1] >> 6) | (serial[0] << 2);
+    ret_arr[7] = (serial[0] >> 3);
+    
+
+    return toByte(ret_arr);
+}
+
+
+function calc_suffix_tag(serial){
+    var ret_arr = begin_calc(serial,[1,2,3,4]);
+
+
+
+
+
+}
+
+function dell_service_tag(serial){
+
+
+
+}