This is a pin map for the Arduino Mega 2560 Rev3. All used ports are

Mega 2560 Rev3 Arduino Documentation

Arduino Mega 2560 R3 - DEV-11061 - SparkFun Electronics

Arduino Mega 2560 R3 (A000067) – PTSolns

Arduino Mega R3 Android Accessory Development Kit (ADK) Board [ATmega2560 ADK R3] : ID 563 : $84.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Arduino Mega 2560 Rev3 - AndyMark, Inc

OpenCR 1.0

Arduino Mega Tutorial [Pinout]

Arduino Mega 2560 - DEV-09949 - SparkFun Electronics

Arduino Mega Tutorial - Pinout and Schematics. Mega 2560 Specifications