Changes

* <b>Input/Output.</b>  Computers are only useful if they can generate output.  Output can vary from control lines for engine components to characters on a video screen.  Input also varies in form, but most computers need input to process, which then drives the output.

* <b>Input/Output.</b>  Computers are only useful if they can generate output.  Output can vary from control lines for engine components to characters on a video screen.  Input also varies in form, but most computers need input to process, which then drives the output.

Most modern computer systems also have:

Most modern computer systems also have peripheral devices:

* <b>Storage.</b>  Large amounts of lower-speed, less-expensive hardware where data can be stored for later retrieval.  Storage can be local or it can be remotely accessed via a network.  The most typical form of local storage are hard disks, SSDs, thumb drives, and DVDROMs.

* <b>Storage.</b>  Large amounts of lower-speed, less-expensive hardware where data can be stored for later retrieval.  Storage can be local or it can be remotely accessed via a network.  The most typical form of local storage are hard disks, SSDs, thumb drives, and DVDROMs.  Older mass storage devices include punch cards, paper tapes, magnetic tapes, and CDROMs.

* <b>Other I/O devices.</b> Any number of optional peripheral devices are available for computers, including [[Computer mouse|mice]], scanners, card readers, [[terminals]], and [[printers]].

==Binary and ternary==

==Binary and ternary==