Don Lancaster's TV Typewriter, a reprint of an amazingly prescient article in the September 1973 issue of Radio Electronics magazine. The site includes the complete booklet you could order from the inventor.
Lots more on vintage computers from the Southwest Technical Products Corporation.
This article was just the beginning of what would become a book, "TV Typewriter Cookbook," it's far larger and more comprehensive than the booklet that RadioElectronics published. I remember buying the book in 1976 when it came out, it was one of my primary sourcebooks for learning about microcomputers. This article and book was an important part of the origin of modern microcomputers, it was required reading for anyone designing video display circuits.