Article: Q103883
Product(s): Windows for Workgroups and Windows NT Networking Issues
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Last Modified: 30-JUL-2001
LOCAL I/O OPERATION
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.
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