- without instructions and info the comp doesn't know what to do
- putting data into the comp
- referred as data entry
- processor is where the work is
- recieves info
- stores it as memory
- made of two parts (cpu and and main storage)
OUTPUT
- sends the data saved back to the operator
- wouldn't know what the comp had done
- would be useless without this
- hard copys usually printed on paper through printer
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