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11 Cards in this Set

  • Front
  • Back

General purpose computer system

A computer is an electronic device , operating under the control of instructions stored in its memory.


Accept data (input)


Manipulate data (processing)


Produce results from the processing


Store data and results for future use (memory)


CPU

Central processing unit which is the brain of the computer and therefore controls how the rest of the computer works


CU- CARRIES OUT INSTRUCTIONS IN THE SOFTWARE AND DIRECTS THE FLOW OF DATA THROUGH THE COMPUTER


ALU- PERFORMS THE CALCULATIONS AND LOGIC OPERATIONS

Main memory

Located directly on the main circuit board so that data can travel quickly to and from the CPU.


Secondary storage

Permanently stored

Bistable Devices

It can be in only two possible states.


ON/OFF


0/1


PULSE/NO PULSE

ROM vs RAM

RAM has temporary instructions for the computer, where the CPU receives instructions from. It is volatile


ROM- instructions that can be read but not changed (non-volatile)

ROMS

PROM-programmable ROM


EPROM- erasable PROM, can be erased and reprogrammed repeatedly. It is erased when exposed to UV light


EEPROM- electronically EPROM, erased electronically

Bit

Zeros and ones known as the binary system

Byte

8bits is 1 byte


Kilobyte is 2^10 which is 1024bits

Word

Largest amount of data which can be accessed together is called a word

Wordsize

Number of bits which can be transferred in a word is know as its wordsize