Apple has released updated documentation describing the ports and connectors on 2009 MacBook Pro models, presenting the hardware in a more comprehensive way for customers.
KB article HT3627 titled “MacBook Pro (13-inch, Mid 2009): External ports and connectors” has been updated on Apple’s Support site to give customers a better description of the I/O ports found on MacBook Pro notebooks shipped in the summer of 2009.
The document specifically addresses the 13-inch version of the laptop, detailing the MagSafe power port, the Gigabit Ethernet port, the FireWire 800 port, the Mini DisplayPort, USB 2.0 connections, the headphone (jack) plug, and the SD card slot.
A comprehensive graphical representation of the laptop along with a table shows each individual port with its respective description (i.e. what it is and what it does).
For example, FireWire 800 allows you to “Connect high-speed external devices, such as digital video cameras and storage devices. Connect an adapter or cable to use this port as FireWire 400, FireWire 200, or FireWire 100.”