Build Your Own ZX80 - How to build your own ZX80. Includes construction details, parts list, pictures and software. - http://home.micros.users.btopenworld.com/zx80/zx80.html
ZX80 World - A place to learn about the ZX80 computer, the people, Tim Hartnell, the books, magazines. - http://freespace.virgin.net/christopher.cox/zx80/index.htm
ZX80 - Planet Sinclair - Information, photos and resources for the Sinclair ZX80, including a detailed account of its development extracted from Ian Adamson and Richard Kennedy's book "Sinclair and the Sunrise Technology". - http://www.nvg.org/sinclair/computers/zx80/zx80.htm