The list of the ports on Mega page says "Serial: 0 (RX) and 1 (TX); Serial 1: 19 (RX) and 18 (TX); Serial 2: 17 (RX) and 16 (TX); Serial 3: 15 (RX) and 14 (TX)". But in the schematic there is atleast TX2/RX2 at pins 13 and 12. Are those pins serial ports, is there a reason they are missing from the text listing. What is the correct list.
By the way the Megas web page text is funny. It almost looks like the first serial port RX pin is connected to the pin #0. Quite a rare ic.