So I'm using this shield ... - http://linksprite.com/wiki/index.php5?title=NFC_PN532_Shield ..but I'm looking to expand to use an Ethernet/SD card shield also. I'm aware they cannot both use the same SS pin, so I looked into if one of them could use another other than D10, when I came across that the SS pin on the mega was 53, but I've been using 10 absolutely fine. However 9 does not work.
Is 53 and 10 the only SS pin on the mega? And does anyone know of some compatible sd/ethernet shields that I could stack that did not use d10 as SS?