What Happened to Punched Paper Tape Before Magnetic Storage Took Over?

Before magnetic tape, floppy disks, and modern digital storage, computers and communication systems often stored information as physical holes punched into long strips of paper. Punched paper tape began with nineteenth-century telegraph systems, but its influence eventually reached wartime codebreaking, early computers, numerical-control machine tools, and the birth of the personal computer industry. This video explores how punched tape worked, why machines such as Colossus depended on it, how it became a common way to load programs into early computers, and how a paper tape carried Altair BASIC—the software that helped launch Microsoft. You’ll also discover why magnetic storage gradually replaced paper tape, how cassette tapes and floppy disks pushed it out of everyday computing, and why the U.S. military and National Security Agency continued using punched tape for cryptographic keys long after the rest of the world had moved on. The last NSA punched key tape in the United States was produced in 2019. Yet punched tape never completely disappeared. Its legacy still survives in computer conventions such as ASCII DELETE, XON/XOFF flow control, and even parts of the language and habits of modern computing. #PunchedTape #ComputerHistory #VintageComputing #DataStorage #TechnologyHistory