Overview: "Local" I/O Operation (103883)
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.
| Modification Type: |
Major |
Last Reviewed: |
7/30/2001 |
| Keywords: |
KB103883 |
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