Here is a link to one of the replies that I earlier got http://www.8052.com/forum/read.phtml?id=38738

While on it just read through the rest of the thread also and other postings on this topic - many including undersigned, had problems getting this to work. Nothing wrong with the circuit but other things like OS were issues. But then there were others (as usual ;-) who said it works wonders for them.

Hope it helps.

Raghu