Do you know HOW a COMPUTER TAPE DRIVE REALLY Works? 1968 Phase Encoding IBM 2420 NOW Technology

Very Technical Computer Magnetic Tape Recording Info, circa 1968. This Technical training film describes the IBM 2420 magnetic tape drive, introduced with the IBM System/360 in 1964. The 2420 improved System/360's throughput by providing faster tape speeds, better access times and superior rewind ability. The film describes significant improvements in the 2420 Tape Drive system including "Phase Encoding" technology. Illustrations and diagrams are included as well as high definition views of the tape mechanisms. An excellent instructional training aid and historical reference. Terms and concepts include magnetic tape transport, tape “skew”, bit encoding, parity and parity error, recording reliability, The concept of FCP, “Functional circuit packaging” is mentioned. FCP is the process of encapsulating semiconductor materials into a protective case to create a functional circuit. A process is also known as integrated circuit (IC) packaging. Other Discussions include: Advancements in 2420 model 5 and 2420 model 7 machines, using 9 Track Tape, Cartridge Loading Mechanisms, with 10.5 inch reels. The NRZI, “Non-Return to Zero, IBM”, term is also explained. Run time 16 mins. Uploaded by Computer History Archives Project - CHAP, for comment and discussion, and reference 2k and 4k Stock Footage available from Periscope Film http://www.periscopefilm.com For more information on IBM Magnetic Tape Drives visit: http://www.ibm.com