What is Device controller?
[[Image:Kontroler scsi isa.jpg|thumb|200px|SCSI device controller]] A device controller is a system that handles the incoming and outgoing signals of the CPU by acting as a bridge between CPU and the I/O devices. A device is connected to the computer via a plug and socket, and the socket is connect to a device controller. Device controllers use binary and digital codes. An IO device contains mechanical and electrical parts. A device controller is the electrical part of the IO device. == Device-Operating System Communication== The Device Controller receives the data from a connected device and stores it temporarily in some special purpose registers (i.e. local buffer) inside the controller. Then it communicates the data with a [[Device driver|Device Driver]]. For each device controller there is an equivalent device driver which is the standard interface through which the device controller communicates with the Operating Systems through Interrupts. Device controller is a hardware whereas device driver is a software. The controller's job is to convert the serial bit stream to block bytes and perform any error correction necessary. Each device controller is in charge of a specific type of device (for example disk drives, audio devices, or video displays). Each device controller has a local buffer. {{Tech-stub}} [[Category:Computer science]] [[Category:Electronics]]