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31 Cards in this Set
- Front
- Back
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system clock (measured in hertz)
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2.4 billion clock cycles per sec
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software
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freeware, shareware, public domain software
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PDA (palm pilot)
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softwares- PIM (calendar, addresses)
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spreadsheet software
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excel (use charts)
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DVD-ROM
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digital versatile disc-ROM or
digital video disc-ROM high capacity disc storing 4.7 GB to 17GB must have DVD-ROM drive or DVD player to read stores databases, music, complex softwares, movies |
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DVD-RW
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Rewritable DVD
some are double sided |
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different ways to upgrade CPU
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chip to chip
piggy back daugther board upgrade |
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microprocessor
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CPU
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processor
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(central processing unit)
interprets and carries out basic instructions that operate a computer. control unit. arithmetic logic unit (ALU). |
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The four operations of the CPU that make up the machine cycle.
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1. fetch- obtain program instructions or data item from memory.
2. decode- translate instructions into commands. 3. execute- carry out and command. 4. store- write result to memory. |
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cache
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helps speed computer processes by storing frequently used instructions and data.
also called memory cache. |
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how is application software distributed
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packaged software, custom software, shareware, freeware, public-domain software
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how big is a point?
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1/72nd of an inch
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what is a nanosecond?
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1 billionth of a second
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what is the average size of a harddrive
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40-250 gigabites
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kilobite
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1000
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megabite
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1,000,000
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gigabite
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1,000,000,000
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terabite
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1,000,000,000,000
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what is spreadsheet software?
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-organizes data
-performs calculations and recalculates when data changes. =A1+B2(*C12) =D1+E2(*F12) =Sum (C12:Y12) |
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what is a function?
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a predefined formula that performs calculations
=C4+C5+C6+C7+C8 =SUM (C4:C8) |
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what are the different parts of the database?
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-a table contains records
-a record is a row in a table that contains information about a person, product, or event -a field is a column in a table that contains a specific piece of information within a record |
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what does volatile mean?
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the information is lost when the computer is turned off
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storage medium is nonvolatile
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contents are restored when power is turned off
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memory is volatile
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holds data and instructions temporarily
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floppy disk formula
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2 sides x 80 tracks x 18 secotrs per track x 512 bites per sector= 1.44 MB
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what is a cylinder?
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vertical section of track through all platters; single movement of read/write head arms accesses all platters in cylinder
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what is a disk cache?
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portion of memory that processor uses to store frequently accessed items
1st request for data- to disk cache 2nd request for data- to hard disk |
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what is a track
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divided into evenly sized sectors that store items
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what is static ram (SRAM)
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used for special applications such as cache
faster and more reliable than DRAM chips |
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what is dynamic ram (DRAM)
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most common type
faster variations of DRAM are SDRAm and RDRAM |
