The part of a computer that completes the processing.It can be said to fetch and execute instructions from main memory.This is called the fetch,decode,execute cycle.
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What are some factors that affect the CPU's speed?
clock speed,number of cores and cache
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What are the two main parts of the CPU?
Control unit that provides control signals and the ALU that performs any logic calculations
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What is an embedded system?
A computer that is fully contained within the device it controls
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Job of the program counter
points to the next instruction in memory,copies its value to the MAR,gets incremented by 1
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Job of the memory address register
recieves a memory address from the PC,sends it along with the address bus to the correct location in memory
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Job of the memory data register
the instruction and data is sent along the data bus and stored in the MDR
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Job of the accumulator
when the instruction is executed the results are stored here.
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What is RAM and what is the role of it?
Random access memory. Stores instructions and data for programs that are currently in use. It is volatile
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What is ROM and what is the role of it?
Read only memory.Stores instructions needed to boot up the computer including the BIOS. its non volatile
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What is virtual memory?
When there isnt enough space in RAM for all the programs that are currently being run.Using virtual memory is much slower than RAM
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What is cache memory?
Super fast memory close to the CPU.It stores the most commonly used instructions so they can be retrieved faster
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What is flash memory?
ROM memory that can be rewritable. Very fast
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What is the order of units of data?
Bit,nibble,byte,kilobyte,megabyte,gigabyte,terbyte and petabyte
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What is a network?
When two or more computers are connected together
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Benefits of a network
files can be shared,resources like printers and scanners can be shared,buying software is cheaper and you can manage users and security centrally
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advantages of a LAN
quick and easy,cheap to set and maintain and fast
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disadvantages of a LAN
small area only and relatively few computers
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Card 2
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What are some factors that affect the CPU's speed?
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