Microsoft KB Archive/103883

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Overview: "Local" I/O Operation

Article ID: 103883

Article Last Modified on 7/30/2001

This article was previously published under Q103883



When an application requests I/O services, the underlying operating system calls device driver software that is resident in BIOS on most MS-DOS PCs. Device driver software is written to communicate with the device controller card, and can thus forward the I/O request to firmware that is resident on the controller.

The device controller then provides the required control signals to the device.

Keywords: KB103883