22PCI slots. These six 32-bit PCI 2.2 expansion slots support bus master PCI cards like SCSI or LAN cards with 133MB/s maximum throughput.
23Audio controller. This C-Media 6-channel PCI audio chip supports legacy audio and HRTF 3D positional audio functions. The chip also supports 24-bit SPDIF In (0.5~5V) and SPDIF Out (44.1K and 48K formats) professional digital audio interface.
LAN controller. This RealTek 8100 PCI LAN controller fully supports 10BASE-T/100BASE-TX Ethernet networking. (on LAN models only)
Microphone jack. This Mic (pink) jack connects a microphone. In 6-channel audio mode, this connector becomes Bass/Center.
Line In jack. This Line In (light blue) jack connects a tape player or other audio sources. In 6-channel mode, this connector becomes Rear Speaker Out.
Line Out jack. This Line Out (lime) jack connects a headphone or a speaker.
28Game/MIDI connector. This connector supports a joystick or a game pad for playing games, and MIDI devices for playing or editing audio files.
Serial ports. These two 9-pin COM1/COM2 ports are for pointing devices or other serial devices.
Parallel port. This 25-pin port connects a parallel printer, a scanner, or other devices.
USB ports. These two 4-pin Universal Serial Bus (USB) ports are available for connecting USB devices such as a mouse and PDA.
32RJ-45 port. This port allows connection to a Local Area Network (LAN) through a network hub. (on LAN models only)
33PS/2 keyboard port. This purple 6-pin connector is for a PS/2 keyboard.
34PS/2 mouse port. This green 6-pin connector is for a PS/2 mouse.
ASUS P4B-E motherboard user guide