Changes

* <b>Memory.</b>  High-speed local storage, such as [[Random-access memory]]

* <b>Memory.</b>  High-speed local storage, such as [[Random-access memory]]

* <b>Software.</b>  Each unique computer hardware environment needs software that works with the model of processor used in that computer.

* <b>Software.</b>  Each unique computer hardware environment needs software that works with the model of processor used in that computer.

* <b>Input/Output.</b>  Computers are only useful if they can generate output.  Output can vary from control lines to 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:

* <b>Storage.</b>  Large amounts of lower-speed, less-expensive hardware where data can be stored for later retrieval.  The most typical form is 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.

==Binary and ternary==

==Binary and ternary==