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- IBM_305_RAMAC abstract "The IBM 305 RAMAC was the first commercial computer that used a moving-head hard disk drive (magnetic disk storage) for secondary storage. The system was publicly announced on September 14, 1958, with test units already installed at the U.S. Navy and at private corporations. RAMAC stood for \"Random Access Method of Accounting and Control\", as its design was motivated by the need for real-time accounting in business.The first RAMAC to be used in the U.S. auto industry was installed at Chrysler's MOPAR Division in 1957. It replaced a huge tub file which was part of MOPAR's parts inventory control and order processing system. The 305 was one of the last vacuum tube computers that IBM built. It weighed over a ton. The IBM 350 disk system stored 5 million alphanumeric characters recorded as 6 data bits, 1 parity bit and one space bit for 8 bits recorded per character. It had fifty 24-inch-diameter (610 mm) disks. Two independent access arms moved up and down to select a disk, and in and out to select a recording track, all under servo control. Average time to locate a single record was 600 milliseconds. Several improved models were added in the 1950s. The IBM RAMAC 305 system with 350 disk storage leased for US$3,200 per month in 1957 dollars, equivalent to a purchase price of about $160,000. More than 1,000 systems were built. Production ended in 1961; the RAMAC computer became obsolete in 1962 when the IBM 1405 Disk Storage Unit for the IBM 1401 was introduced, and the 305 was withdrawn in 1969.The original 305 RAMAC computer system could be housed in a room of about 9 m (30 ft) by 15 m (50 ft); the 350 disk storage unit measured around 1.5 square metres (16 sq ft). The first hard disk unit was shipped September 13, 1956. The additional components of the computer were a card punch, a central processing unit, a power supply unit, an operator's console/card reader unit, and a printer. There was also a manual inquiry station that allowed direct access to stored records. IBM touted the system as being able to store the equivalent of 64,000 punched cards.Programming the 305 involved not only writing machine language instructions to be stored on the drum memory, but also almost every unit in the system (including the computer itself) could be programmed by inserting wire jumpers into a plugboard control panel.During the 1960 Olympic Winter Games in Squaw Valley (USA), IBM provided the first electronic data processing systems for the Games. The system featured an IBM RAMAC 305 computer, punched card data collection, and a central printing facility.Currie Munce, research vice president for Hitachi Global Storage Technologies (which has acquired IBM's hard disk drive business), stated in a Wall Street Journal interview that the RAMAC unit weighed over a ton, had to be moved around with forklifts, and was delivered via large cargo airplanes. According to Munce, the storage capacity of the drive could have been increased beyond five megabytes, but IBM's marketing department at that time was against a larger capacity drive, because they didn't know how to sell a product with more storage.".
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- IBM_305_RAMAC wikiPageWikiLink Chrysler.
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- IBM_305_RAMAC wikiPageWikiLink IBM_1401.
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- IBM_305_RAMAC wikiPageWikiLink IBM_Electric_typewriter.
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- IBM_305_RAMAC wikiPageWikiLink Method_of_complements.
- IBM_305_RAMAC wikiPageWikiLink Mopar.
- IBM_305_RAMAC wikiPageWikiLink Opcode.
- IBM_305_RAMAC wikiPageWikiLink Parity_bit.
- IBM_305_RAMAC wikiPageWikiLink Plugboard.
- IBM_305_RAMAC wikiPageWikiLink Punched_card.
- IBM_305_RAMAC wikiPageWikiLink Relay.
- IBM_305_RAMAC wikiPageWikiLink Revolutions_per_minute.
- IBM_305_RAMAC wikiPageWikiLink Servomechanism.
- IBM_305_RAMAC wikiPageWikiLink Signed_number_representations.
- IBM_305_RAMAC wikiPageWikiLink The_Wall_Street_Journal.
- IBM_305_RAMAC wikiPageWikiLink Tub_file.
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- IBM_305_RAMAC wikiPageWikiLink File:BRL61-IBM_305_RAMAC.jpeg.
- IBM_305_RAMAC wikiPageWikiLink File:IBM_350_RAMAC.jpg.
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- IBM_305_RAMAC wikiPageWikiLinkText "305 RAMAC".
- IBM_305_RAMAC wikiPageWikiLinkText "IBM 305 RAMAC".
- IBM_305_RAMAC wikiPageWikiLinkText "IBM 305".
- IBM_305_RAMAC wikiPageWikiLinkText "RAMAC".
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- IBM_305_RAMAC subject Category:1956_introductions.
- IBM_305_RAMAC subject Category:IBM_vacuum_tube_computers.
- IBM_305_RAMAC hypernym Computer.
- IBM_305_RAMAC type InformationAppliance.
- IBM_305_RAMAC type Computer.
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- IBM_305_RAMAC comment "The IBM 305 RAMAC was the first commercial computer that used a moving-head hard disk drive (magnetic disk storage) for secondary storage. The system was publicly announced on September 14, 1958, with test units already installed at the U.S. Navy and at private corporations. RAMAC stood for \"Random Access Method of Accounting and Control\", as its design was motivated by the need for real-time accounting in business.The first RAMAC to be used in the U.S.".
- IBM_305_RAMAC label "IBM 305 RAMAC".
- IBM_305_RAMAC sameAs Q980941.
- IBM_305_RAMAC sameAs IBM_305_RAMAC.
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- IBM_305_RAMAC sameAs IBM_RAMAC_305.
- IBM_305_RAMAC sameAs IBM_305_RAMAC.
- IBM_305_RAMAC sameAs Ramac.
- IBM_305_RAMAC sameAs IBM_305_RAMAC.
- IBM_305_RAMAC sameAs IBM_305_RAMAC.
- IBM_305_RAMAC sameAs m.03jq5w.
- IBM_305_RAMAC sameAs IBM_305_RAMAC.
- IBM_305_RAMAC sameAs Q980941.
- IBM_305_RAMAC wasDerivedFrom IBM_305_RAMAC?oldid=708352910.
- IBM_305_RAMAC depiction BRL61-IBM_305_RAMAC.jpeg.
- IBM_305_RAMAC isPrimaryTopicOf IBM_305_RAMAC.