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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 fetch and execute cycle
- the cpu is more or less the brain of the computer
- what the cpu does is to fetch and
execute instructions from the
memory
- the cpu processes data
- the cpu is the central processing unit
- 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.
- basically this cycle we
speak of is carried out by
the cpu
- 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
- stands for random access
memory
- 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
- stands for read only
memory
- ALU
- stands for arithmetic logic unit
- this is one part of the CPU
- this is where all the calculations take place
- stands for arithmetic logic unit
- control unit
- retrived data from the memory and
executes the instructions
- directs the flow of insructions and co-ordinates parts of the cpu
- directs the flow of insructions and co-ordinates parts of the cpu
- retrived data from the memory and
executes the instructions
- 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
- e.g: icloud
- magnetic storage
- include the actual hard
disk that the memory is
stored on
- 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
- e.g: cd's, dvd's etc.
- solid state storage
- e.g: flash drives and usb's
- use electronic
circuits to store
data
- e.g: flash drives and usb's
- These are all secondary storage
- cloud storage
- HDD
- stands for hard disk drive
- can store large
amounts of data
- can store large
amounts of data
- stands for hard disk drive
- flash memory
- operates in a similar way to ROM
- uses electronic chips as storage
- is portable
- is portable
- uses electronic chips as storage
- operates in a similar way to ROM
- cache memory
- stores copies of instructions
from the ram
- stores copies of instructions
from the ram
- internal memory
- provides fast access storage to
data that is being used by the cpu
- provides fast access storage to
data that is being used by the cpu
- controller
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