I happen to have a July 1964 issue of Electronics World with an article titled "Binary Computer Codes and ASCII" by Ed Bukstein. It gives a summary of existing codes then has this statement. The recent trend toward "networking" of computers has emphasized the need for a standard code. Here is the American Standard Code for Information Interchange X3.4-1963 chart http://www.swtpc.com/mholley/ElectronicsWorld/Jul1964/ASCII_1963.jpg (I have got it in tiff also.) Note that lower case is unassigned and the underscore is a back arrow. Also in this issue Don Lancaster has a light dimmer project. It uses a new semiconductor called a "bilateral switching diode". Michael Holley