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3371531
the basics of computer science
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just the basics tbh
Mapa Mental por
sobahor34
, atualizado more than 1 year ago
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Criado por
sobahor34
mais de 8 anos atrás
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the basics of computer science
CPU
the cpu is the central processing unit
what the cpu does is to fetch and execute instructions from the memory
the fetch and execute cycle
the cpu is more or less the brain of the computer
the cpu processes data
the fetch and execute cycle
basically this cycle we speak of is carried out by the cpu
fetching is when the cpu finds out which instruction it needs to carry out. the nstruction comes from the memory
the cpu fetches the instruction from the memory and then carries it out.
RAM
stands for random access memory
all contents of the ram is lost when the power is switched off
when a program loads, the instructions are loaded unto ram
ROM
stands for read only memory
the rom stores data that will not need to be updated
when the power is switched off, the data does not go anywhere
ALU
stands for arithmetic logic unit
this is one part of the CPU
this is where all the calculations take place
control unit
retrived data from the memory and executes the instructions
directs the flow of insructions and co-ordinates parts of the cpu
different types of memory
cloud storage
e.g: icloud
refers to when data is stored away from the computer
and can be accesed at different points over the internet
magnetic storage
include the actual hard disk that the memory is stored on
optical storage
e.g: cd's, dvd's etc.
are written and read using lasers
solid state storage
e.g: flash drives and usb's
use electronic circuits to store data
These are all secondary storage
HDD
stands for hard disk drive
can store large amounts of data
flash memory
operates in a similar way to ROM
uses electronic chips as storage
is portable
cache memory
stores copies of instructions from the ram
internal memory
provides fast access storage to data that is being used by the cpu
controller
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