Computer science definitions

Whats the definition of a computer system

• Anything that has a input, output device and storage devices

• has inputs

• has ouputs

• is a computer

Define Reliability

• How reliable systems are-unreliable systems may have legal impact, aircraft accidents etc.,loss of data, loss of use of systems impacting on buisness.

• How reliable systems arent- reliable systems may not have legal impact, aircraft accidents etc.,loss of data, loss of use of systems not impacting on buisness.

What isnt diaster recovery?

• Planning what to do

• having a plan of what to do

• planning in case of disaster

• lack of planning or no planning of what to do in case of natural disaster

What is De facto?

• Standards that just develop by common use. They become the standard way of doing things(Eg. programmers using comments).

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• Software keeps an eye on the health of systems. If it detects a problem it may switch over to another working system (mirror system) and keeps the system running.

• When a computer system isnt running the system is down. It is important to reduce the amount the system is down.

What is redundancy?

• Keeping a spare piece(s) of hardware in case one breaks. Making sure there is no system down time.

• Standards that develop

• When a computer system isnt running, the system is down.

What is RAM?

• Volatile memory which holds the most recent instructs that have been processed. Lack of RAM is likely to cause performance issues

• Non Volatile memory that holds the bootup program used when the computer first starts(boot strap sequence) known as the BIOS(basic input output system)

What is an area on the hard disk used as memory a which is Used when RAm is too small to deal with the amount of instructions. Affects the performance.

• Virtual memory

• Visual memory

• Virtual network

• Flash memory

Which register is this? It acts as a buffer, a storage place for data that is "on its way" to somewhere else. It holds data to be FETCHED and changed by the CPU.

• MDR

• MAR

• PC

• MDDRA

What is the ALU?

• Arithmetic Logic Unit- This is responsable for all the arithmetic and logical operations in the CPU.

• ALU a type of food in an indian restaurant

• Arimaths Loogik Uniet

• alu werks as logic operationm

What increments during the FDE cycle?

• PC- Program Counter. This holds the adress (location) of the next instruction to execute.

• ALU- Arithmetic Logic unit.

• Control Unit- This coordinates the actions of the CPU