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System Unit Hardware
NA
41
Computer Science
12th Grade
11/08/2012

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Term
hardware
Definition
physical components that make up a computer system (e.g., system unit, keyboard, monitor)
Term
arithmetic/logic unit
Definition
expansion of the acronym ALU
Term
control unit
Definition
expansion of the acronym CU
Term
server
Definition
type of computer used by small- and medium-sized companies to support multi-user applications, provide network access and data storage, and host websites
Term
supercomputer
Definition
very large, very fast, and very expensive computer used by government agencies and large corporations for specialized applications and research
Term
motherboard
Definition
large circuit board inside the system case to which all of a computer system's components and devices are connected
Term
ALU
Definition
processor component responsible for performing all mathematical calculations and logical comparisons
Term
CU
Definition
processor component that oversees and manages the movement of data between components and devices
Term
byte
Definition
collection of 8 bits used to represent letters, numbers, and special characters
Term
random access memory
Definition
expansion of the acronym RAM
Term
read-only memory
Definition
expansion of the acronym ROM
Term
volatility
Definition
characteristic of RAM which causes all contents to be lost when the computer is shut down or power is lost
Term
ROM
Definition
type of memory which retains its contents even when power is lost
Term
RAM
Definition
type of memory whose contents are lost when power is lost
Term
bit
Definition
binary digit - a 0 or 1
Term
kilobyte (KB)
Definition
collection of approximately 1,000 bytes
Term
megabyte (MB)
Definition
collection of approximately 1,000,000 bytes
Term
gigabyte (GB)
Definition
collection of approximately 1,000,000,000 bytes
Term
terabyte (TB)
Definition
collection of approximately 1,000,000,000,000 bytes
Term
form factor
Definition
describes the size and orientation of a motherboard
Term
instruction cycle
Definition
series of steps that describes how instructions and data are moved from devices to memory to the processor, and back during program execution
Term
RAM
Definition
all instructions and data must be copied here before the processor can manipulate them
Term
fetch
Definition
machine cycle step in which the control unit obtains a program instruction or data item from RAM and copies it to the processor
Term
decode
Definition
machine cycle step in which a program instruction or data item is translated into binary (which can be understood by the processor)
Term
execute
Definition
machine cycle step in which the processor carries out an instruction
Term
store
Definition
machine cycle step in which the control unit copies a processing result from the processor back to RAM
Term
machine cycle
Definition
series of steps that describes how instructions and data are moved between RAM and the processor during instruction execution
Term
flashing
Definition
process of rewriting the contents of an updatable ROM chip
Term
BIOS
Definition
primitive instructions that "tell" the computer how to load the operating system from the hard drive on boot
Term
ROM
Definition
type of memory chip on which the BIOS is stored
Term
basic input/output system
Definition
expansion of the acronym BIOS
Term
CMOS
Definition
stores user-configurable BIOS settings (e.g., passwords, boot sequence)
Term
RAM---with a battery backup
Definition
type of chip used to store user-configurable BIOS settings (e.g., passwords, boot sequence)
Term
bus
Definition
system of wires used to connect motherboard components
Term
trace
Definition
single bus wire
Term
central processing unit
Definition
expansion of the acronym CPU
Term
instruction pointer
Definition
holds the memory address of the instruction currently being executed by the processor
Term
instruction register
Definition
holds a copy of the instruction currently being executed by the processor
Term
accumulator
Definition
special register in the processor that holds the results of mathematical
Term
register
Definition
high speed memory location in the processor that hold instructions and data as they are being processed
Term
microprocessor (CPU)
Definition
"brains" of the computer responsible for all data manipulation and instruction execution
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