Overview: "Local" I/O Operation
Article ID: 103883
Article Last Modified on 7/30/2001
This article was previously published under Q103883
SUMMARY
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.
Keywords: KB103883