1 - Memory Module Sockets
2 - Multibay
3 - Keyboard / Mouse
4 - Solenoid Hood Lock
5 - Parallel
6 - Serial
7 - USB
8 - Network USB
9 - Audio
10 - Rear Chassis Fans
11 - PCI-Express x16 (graphics)
12 - PCI
13 - PCI-Express x8 Prime
14 - Auxiliary Audio
15 - CD-ROM Audio
16 - Front Audio
17 - Trusted Platform Module
18 - Serial ATA
19 - Front USB
20 - Front Chassis Fan
21 - Front Control Panel
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