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Computer history project

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by

Aaron Williams

on 18 January 2013

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Transcript of Computer history project

Minicomputer Mainframe Computer Memory ,Storage, and Mini computers Computer History Mini Computers Memory In the early 1940s the technology for memory was the day was the vacuum tube. Storage Early computers used punch cards to input programs and data. Punch cards were in common use until the mid-1970s. The first hard disk drive was the IBM Model 350 Disk File. It had 50 24-inch discs with a storage capacity of 5 million characters (just under 5 MB The first hard drive to have more than 1 GB in capacity was the IBM 3380. It was made in 1980 and it could store 2.52 GB. It was the size of a refrigerator, weighed 550 pounds The floppy disk was invented by IBM and used the mid-1970s to the late 1990s had a capacity of 79.7 kB The pace at which RAM has developed has been somewhat slower than the rate for other computing technologies which sets an extremely high bar for development and has led to a discrepancy particularly with regards to the speed at which a CPU and RAM can operate respectively.

RAM (Random Access Memory) is much faster than magnetic memory, but has much lower capacity, and loses its memory when the power is removed. Programs and data you want to operate on are stored on the disk, for example, a word document. When you want to edit the word document, the document is copied from the disk to RAM Magnetic tape was first used for data storage in 1951.The effective transfer rate for the magnetic tape read about 7,200 characters per second. The tapes were metal and 1200 feet long Background: Current: Current Background Robert Norman patented a semiconductor static RAM {Random Access Memory} design at Fairchild in 1963 that was later used by IBM as the Harper cell.

In 1965 a collaborative development between Scientific companies produced a fully-decoded 8-bit bipolar device and later that year Components Division engineers Ben Agusta and Paul Castrucci developed the SP95, a 16-bit RAM for the IBM System/360 Model 95.

Random Access Read-Write Memories (RAMs) store information that changes frequently and must be accessed quickly. Offering the lowest cost per storage bit. Designed to be smaller and simpler than mainframe computers
Simple, fast, inexpensive computer
Hit new range of customers
used for small businesses, control manufacturing, or collecting scientific data Development Future of RAM: There isn't much development happening in the world of Random Access Memory other than NVRAM non-volatile RAM which allows RAM to retain information after having no power. This technology is not widely implemented due to other drawbacks. Current and Future Minicomputer era ended in the 1990's when Personal Computers were invented
PC's were cheaper and easier to use. They were the first computers people used at home.
Today we depend on PC's for many tasks. Phones are now like mini, hand held PC's.
In the future people will depend even more on PC computers and paper will become more and more obsolete. Wes Clark designed the first minicomputer around 1960 to collect scientific data
LINC (Laboratory Instrument Computer) liked design and created 12 more
Minicomputers hit the market in 1961 with Digital Equipment's PDP-1 for $120,000
Opened new market for computer companies
Each new design was more efficient and cheaper than the last one Current memory for computers is the hard drive Future Memory will continue to become more dense (More memory capacity in a smaller space)
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