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Used Sun SystemsSun Microsystems, Inc. is an American vendor of computers, computer components, computer software, and information technology services. Sun systems is headquartered in Santa Clara, California. Sun is located in part of Silicon Valley. Sun Systems is on the former west campus of the Agnews Developmental Center. Sun Microsystems Products include computer servers and workstations based on its own SPARC processors as well as AMD's Opteron and Intel's Xeon processors; storage systems; and, a suite of software products including the Solaris Operating System, developer tools, Web infrastructure software, and identity management applications. Other technologies of note include the Java platform and NFS. Sun is a proponent of open systems in general and UNIX in particular and a major contributor of open source software. http://en.wikipedia.org/wiki/Sun_Microsystems portable multimedia playerA portable multimedia player (PMP), sometimes referred to as a portable video player (PVP), is a consumer electronics device that is capable of storing and playing digital media. Digital audio players (DAP) that can also display images and play videos are PMPs. Like DAPs, the data is typically stored on a hard drive, microdrive, or flash memory. Other types of electronic devices like cellphones are sometimes referred as PMPs due to their playback capabilities. Wiki portable multimedia playerRecyclingRecycling is the reprocessing of materials into new products. Recycling generally prevents the waste of potentially useful materials, reduces the consumption of raw materials and reduces energy usage, and hence greenhouse gas emissions, compared to virgin production. Recycling is a key concept of modern waste management and is the third component of the waste hierarchy. Recyclable materials, also called "recyclables", may originate from a wide range of sources including the home and industry. They include glass, paper, aluminium, asphalt, iron, textiles and plastics. Biodegradable waste, such as food waste or garden waste, is also recyclable with the assistance of micro-organisms through composting or anaerobic digestion. Recyclates are sorted and separated into material types. Contamination of the recylates with other materials must be prevented to increase the recyclates' value and facilitate easier reprocessing for the ultimate recycling facility. This sorting can be performed either by the producer of the waste or within semi- or fully-automated materials recovery facilities. There are two common household methods of recycling. In curbside collection , consumers leave presorted recyclable materials in front of their property to be collected by a recycling vehicle. With a "bring" or carry-in system, the householder takes the materials to collection points, such as transfer stations or civic amenity sites. Wiki RecyclingRefurbishmentRefurbishment (restoration) is the process of major maintenance or minor repair of an item, either aesthetically or mechanically. Often, antiques such as furniture are refurbished to bring back their original luster by applying new paint or wood stain, fixing loose joints with glue or nails, and cleaning or replacing hardware such as drawer pulls. Toys such as model trains are also refurbished, especially if they are considered classics. In some cases, even paper items such as valuable comic books can be refurbished by replacing rusty staples, removing page stains with chemicals, etc. If a building is "refurbished", it usually becomes a renovation. Antique, classic and muscle cars are frequently restored, both cosmetically and mechanically. In most jurisdictions, restored cars that pass an inspection can be registered for legal use on the road. Many classic car owners enjoy taking their rare restored vehicles to car shows or out for recreational driving. Computers and laptops that are refurbished usually means that it did not initially pass quality standards of the manufacturer. They then fix or recertify the unit and sell it at a discount price (Up to 30% off). Most of them carry a 30 day store warranty and 90 days with manufacturer. Open-box, returned and/or repaired electronics of all kinds are frequently sold as refurbished, almost always with a guarantee of functionality and at a small discount. Refurbishment is especially common with more expensive types of electronics such as video game consoles and computer monitors, likely because these items have relatively high return rates (attributed to a combination of buyer's remorse and the fact that categories of electronics have a direct cost-to-complexity relationship; complex gadgets are more likely than simpler ones to have one or two defective components) and benefit more, sales-wise, from price-proportional discounts than cheaper items. Wiki Refurbishment |
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ProgramsIn practical terms, a computer program might include anywhere from a dozen instructions to many millions of instructions for something like a word processor or a web browser. A typical modern computer can execute billions of instructions every second and nearly never make a mistake over years of operation. Large computer programs may take teams of computer programmers years to write and the probability of the entire program having been written completely in the manner intended is unlikely. Errors in computer programs are called bugs. Sometimes bugs are benign and do not affect the usefulness of the program, in other cases they might cause the program to completely fail (crash), in yet other cases there may be subtle problems. Sometimes otherwise benign bugs may be used for malicious intent, creating a security exploit. Bugs are usually not the fault of the computer. Since computers merely execute the instructions they are given, bugs are nearly always the result of programmer error or an oversight made in the program's design. In most computers, individual instructions are stored as machine code with each instruction being given a unique number (its operation code or opcode for short). The command to add two numbers together would have one opcode, the command to multiply them would have a different opcode and so on. The simplest computers are able to perform any of a handful of different instructions, the more complex computers have several hundred to choose from—each with a unique numerical code. Since the computer's memory is able to store numbers, it can also store the instruction codes. This leads to the important fact that entire programs (which are just lists of instructions) can be represented as lists of numbers and can themselves be manipulated inside the computer just as if they were numeric data. The fundamental concept of storing programs in the computer's memory alongside the data they operate on is the crux of the von Neumann, or stored program, architecture. In some cases, a computer might store some or all of its program in memory that is kept separate from the data it operates on. This is called the Harvard architecture after the Harvard Mark I computer. Modern von Neumann computers display some traits of the Harvard architecture in their designs, such as in CPU caches. Programs |
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