As verified by the previous message from Wojtek Skulski, the book on the 8051 processor with a chapter on Fuzzy Logic is "The Final Word on the 8051" by Matthew Chapman, copyright 1984. It has 255 pages, the author and copyright notice is on the last page. The final chapter is "CHAPTER 11 - BUMPIN’ FUZZIES WITH THE 8051". The Keil web site does not seem to have a copy posted. http://www.keil.com/c51/ describes the compiler, and http://www.keil.com/books/8051books.asp recommends some books, but a google search of that site does not turn up the document in a location that I see. It is mentioned on pages http://www.keil.com/forum/1709/ and http://www.keil.com/forum/9444/. The entry at 1709 has some clues as to why it was removed, and some (old) locations at which it could be found. I did more searching to try to find a site which clearly (to me) has a legal copy, without full success. The page https://www.coursehero.com/file/6073184/8051a/ is the closest I have found. It shows a preview of the document which matches the file I found elsewhere, and also Wojtek's copy. The MD5 and SHA checksums of the file I found match those of Wojtek's copy. The md5sum of the FINALWD.PDF file is eb7bb4123afbb37508275a8d798e946e FINALWD.PDF The shasum of the FINALWD.PDF file is 83c9de47315172f0156b70d1dae631bb1dc9be8f FINALWD.PDF An "ls -l" on the file shows it is 1550491 bytes in length. The first paragraph of the text is: "This is a book about the Intel 8051 microcontroller and its large family of descendants. It is intended to give you, the reader, some new techniques for optimizing your 8051 projects and the development process you use for those projects. It is not the purpose of this book to provide various recipes for different types of embedded projects." I tried searching for phrases from that first paragraph, as well as the title, and obtained similar but not identical search results from google. -- John Roberts