There are several other sites that have punch card information. Columbia University Computing History Columbia University links If the above 2 links give you an Object Not Found error that is your browser forcing a HTTPS connection even for sites that can't handle HTTPS. There is nothing I can do about it. Although you could look at your browser settings and disable the forcing of HTTPS. 1401 Restoration Project Punched Cards by Douglas W. Jones IBM Punch Card Systems in the U.S. Army WikipediA IBM 100 Years EBCDIC/ASCII table