System/360 computers and peripherals IBM System 360 RPG Debugging Template and Keypunch Card(页面存档备份,存于互联网档案馆) Video of a two-hour lecture and panel discussion(页面存档备份,存于互联网档案馆)
pencil-and-paper M-notation used characters unavailable on the IBM 026 key punch(英语:Keypunch). The READ and PRINT programs induced a de facto standard external notation