Original data data that did not exist before the process itself was initiated (eg. keyboard)
Previously-stored data data that existed prior to the function or the process being initiated (eg. code for programs, software), **data that has already been processed
Original data and previously stored data make up the input.
Storage
secondary memory
where the original data is saved to be used at a later time
external to the CPU
4 considerations:
- speed/access time
- cost
- capacity removable or not?
- type of access
Port controls input/output on CPU, ability to attach IO devices
--serial (comm.)
--PS2
--LPT parallel (faster than serial, mostly used for a printer)
--SCSI faster, requires special interface in machine
--USB (universal serial bus)
--USB 2.0 about the same as USB, but faster
--Firewire fastest
Capacity
TERMS ....... VALUES
One byte = 8 bits
One kilobyte = 1,024 bytes
One megabyte = 1,048,576 bytes
One gigabyte = 1,073,741,824 bytes
One terabyte = 1,099,511,627,776 bytes
