|
unit 3 - hardware
the way the computers architecture came about
primary memory
Input (Data) 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
|