Talk:Controller (computing)/Early shared history from Controller
A controller is a person or device that exercises or attempts to exercise control or influence.
Control Theory
In control theory, a controller is a device that attempts to control states or outputs of a dynamic system. Generally, it accomplishes this using feedback to reject disturbances to the system: known as closed-loop control. Open-loop control also occurs: in systems sufficiently well-characterized to predict what inputs will necessarily achieve the desired states or outputs. For example, the velocity of a motor may be well-characterized for the voltage fed into it, in which case feedback may prove unnecessary.
Organisational Control
In business and administration, the controller is one of the most senior accountants in a firm or institution.
Controllers also feature commonly in the hierarchies of espionage networks.
See also: comptroller
Computing
In computing, especially in computer hardware, controllers occur commonly, often when interfacing with peripherals. See for example:
- disk array controller (a type of storage controller)
- disk controller (a type of storage controller)
- graphics controller or video display controller
- network controller (in Ethernet)
- keyboard controller
- interrupt controller
- RAID controller
- SCSI controller
- Terminal Access Controller
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