PDF reference for the Arduino Mega 2560 board, 6.76 MB, labelled as its datasheet. Its large size suggests it includes the ATmega2560 microcontroller documentation or detailed board information alongside pin mapping. Expect details on headers, power input and regulation, the USB interface and microcontroller pin functions. Useful for tracing a dead board, checking the 5 V and 3.3 V rails, identifying the ICSP header for reloading the bootloader and confirming which port pins map to the board connectors.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @datasheet. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.