Bill Mensch mentioned this book in a video chat I had with him preparing for his VCF West 2020 Virtual presentation. It seems that a book that I'm looking for is hard to find and there is no PDF available. The book is: Microcomputer Systems Principles Featuring the 6502/KIM by Camp, Smay and Triska This is the Google Listing: https://books.google.com/books/about/Microcomputer_Systems_Principles_Featur... This is the World Cat listing: https://www.worldcat.org/title/microcomputer-systems-principles-featuring-th... If anyone knows of a PDF version, then please let me know. If you *have* the book, then consider scanning it for the general public's use. Thanks! -- ========================================= Jeff Brace Vice President & Board Member, VCF East Showrunner Vintage Computer Federation http://www.vcfed.org/ jeffrey@vcfed.org