In a message dated 97-05-11 00:09:18 EDT, you write: << Yes, I believe it was published by TAD Books although I don't remeber the exact title, either. It was available at my local library. At the time I read it, I think I estimated it would cost about $1,000 altogether to build the computer. It would probably be a lot cheaper today. Seemed like a very good boook. >> Z-80 Microcomputer Design Projects, William Barden, Jr. $14.95, Howard Sams. published in 1980. describes a <10 chip single board computer. how much was a Z80 in 1980? KiloBaud Klassroom. by Peter Stark. describes a 6802 single board computer. seems like mostly reprints from the magazine column of the same name. 1982 The 8085 Cookbook. Build your own working computer. Tab books. uses the SC/MP. Build your own advanced computer. Tab books. uses the 9900, i believe. The Bugbooks. I can probably dig out several more which describe a single board system. None get into things such as disk drives, not that I recall anyway. Kelly