PC Systems
Buying a Computer can be a difficult task. There is so many factors to take into account. PC Systems is here to help though. Weather your looking to buy a computer over the internet and have it shipped across the world, or your going to go down to your local Oklahoma Computer Electronics Store and purchase one in person, we can help.
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A program that controls a device. Every device, whether it be a printer, disk drive, or keyboard, must have a driver program. Many drivers, such as the keyboard driver, come with the operating system. For other devices, you may need to load a new driver when you connect the device to your computer. In DOS systems, drivers are files with a.SYS extension. In Windows environments, drivers usually have a.DRV extension.
A driver acts like a translator between the device and programs that like to use the device. Each device has its own set of specialized commands that only its driver knows. In contrast, most programs access devices by using generic commands. The driver, therefore, accepts generic commands from a program and then translates them into specialized commands for the device.
In computing, a device driver or software driver is a computer program allowing higher level computer programs to interact with a hardware device.
A driver generally communicates with the device through the computer bus or communications subsystem to which the hardware connects. When a calling program invokes a routine in the driver, the driver issues commands to the device. When the device returns data to the driver, the driver may invoke routines in the original calling program. Drivers are hardware-dependent and operating-system-specific. They most commonly provide the interrupt handling required for any imperative asynchronous time-dependent hardware interface.
A device driver makes programming easier by acting as a interpreter between a hardware device and the applications or operating systems that like to use it. Programmers can write the higher level application code independently of whatever specific hardware device it will finally control, because code and device can interface in a standard way, iregardles of the software superstructure or of underlying hardware. Every version of a device, such as a printer, requires its own hardware-specific specialized commands. On the other hand, most applications utilize devices (such as a file to a printer) by means of high-level device-generic commands such as PRINTLN (print a line). The device-driver accepts these generic high-level commands and breaks them down into a series of low-level device-specific commands as needed by the device being driven. Furthermore, drivers can provide a level of security as they can run in kernel-mode, thereby protecting the operating system from applications running in user-mode.