OR, It IS possible, looking at the release statement (inserted below) in the .pdf, that scribdb and Andrew Lynch and Bill Bradford may have an interest in where the book is hosted. Dunno. Vern Wright "A Note about this book and its free availability online Readers are encouraged to download this book of design guidelines and application notes from Steve Ciarcia, founder and editorial director of Circuit Cellar magazine. Although the original title first appeared in 1981, pre-dating Circuit Cellar ?the magazine,? I still get a number of purchase requests each year from electronics enthusiasts. Some are just interested in Steve?s brand of designing and ability to overcome obstacles, while others still find themselves tweaking projects that use parts described in Steve?s projects. Please note: The original work was only available as a hard copy. Thanks to Andrew Lynch and Bill Bradford for their work in creating the PDF and getting permission from copyright holder Steve Ciarcia to release it. Scanning done by Bill Bradford. You will be pleased to know that the same style of embedded computing articles can be found each month through Circuit Cellar magazine. Please visit www.circuitcellar.com to learn about this monthly resource for professional designers and electronics enthusiasts alike. Please enjoy ?Build Your Own Z80 Computer? as a great blast from the past. Its style is the foundation on which Circuit Cellar magazine was built and continues to grow. I look forward to seeing you become a part of the ongoing Circuit Cellar success story. Sincerely, Sean Donnelly, Publisher ? Circuit Cellar circuitcellar at circuitcellar.com"