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Drum memory of a Polish ZAM-41 computer Drum memory from the BESK computer, Sweden's first binary computer, which made its debut in 1953. Drum memory was a magnetic data storage device invented by Gustav Tauschek in 1932 in Austria. [1] [2] Drums were widely used in the 1950s and into the 1960s as computer memory.
The IBM 2301 is a magnetic drum storage device introduced in the late 1960s to "provide large capacity, direct access storage for IBM System/360 Models 65, 67, 75, or 85." The vertically mounted drum rotates at around 3,500 revolutions per minute, and has a head-per-track access mechanism and a capacity of 4 MB.
It is a serial-architecture machine, in which the main memory is a magnetic drum. It uses the drum as a recirculating delay-line memory, in contrast to the analog delay line implementation in other serial designs. Each track has a set of read and write heads; as soon as a bit was read off a track, it is re-written on the same track a certain ...
The IBM 305 RAMAC was the first commercial computer that used a moving-head hard disk drive (magnetic disk storage) for secondary storage. [1] The system was publicly announced on September 14, 1956, [2] [3] with test units already installed at the U.S. Navy and at private corporations. [2]
IBM 650 Console Unit [19] housed the magnetic drum storage, arithmetical device (using vacuum tubes) and the operator's console. IBM 655 Power Unit [ 20 ] IBM 533 or IBM 537 Card Read Punch Unit [ 21 ] [ 22 ] [ 23 ] The IBM 533 had separate feeds for reading and punching; the IBM 537 had one feed, thus could read and then punch into the same card.
The drum controller selected the proper head and waited for the data to appear under it as the drum turned. The IBM 650 had a drum memory of 1,000 to 4,000 10-digit words with an average access time of 2.5 milliseconds. Core memory from Project Whirlwind, circa 1951. Magnetic-core memory was patented by A Wang in 1951. Core uses tiny magnetic ...
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The IBM 1405 Disk Storage Unit was announced in 1961 and was designed for use with the IBM 1400 series, medium scale business computers. [25] The 1405 Model 1 has a storage capacity of 10 million alphanumeric characters (60,000,000 bits) on 25 disks. Model 2 has a storage capacity of 20 million alphanumeric characters (120,000,000 bits) on 50 ...