2 <h2>Device classes</h2>
4 Device class is identified by a single byte. It is stored as 2 hexadecimal digits (all in lowercase).
5 They can be examined <a href='/read/PD'>here</a>.
7 <h2>Device subclasses</h2>
9 A device class is divided into subclasses.
10 Each subclass is identified in a same way as a device class, by single byte represented by 2 hexadecimal letters.
12 <h2>Program interface</h2>
14 A subclass can have different program interfaces.
15 An interface is identified by a single byte represented by 2 hexadecimal letters.
18 You can have a look at <a href='/read/PC'>PCI devices</a>.