Port IO: Difference between revisions
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== Which ports belong to this device ==
There are three groups of devices, each requiring a different approach. The first group contains all PC-AT hardware, devices like [[PIT|timers]], [[PIC|interrupt controllers]], [[
The second group is plug-and-play hardware. Most modern cards and optional features are PCI, AGP or PCI express. At boot, their requirements are checked, and the BIOS will assign port ranges to each device. Enumerating the [[PCI]] bus will list all these devices, and can also tell you what ports (and memory mapped ranges) they use.
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