PCI device classes
<h2>Device classes</h2>
<p>
Device class is identified by a single byte. It is stored as 2 hexadecimal digits (all in lowercase).
They can be examined <a href='/read/PD'>here</a>.

<h2>Device subclasses</h2>
<p>
A device class is divided into subclasses.
Each subclass is identified in a same way as a device class, by single byte represented by 2 hexadecimal letters.

<h2>Program interface</h2>
<p>
A subclass can have different program interfaces.
An interface is identified by a single byte represented by 2 hexadecimal letters.

<h2>See also</h2>
You can have a look at <a href='/read/PC'>PCI devices</a>.