====== nand ======
  *[[http://www.ladyada.net/make/gpsshield/index.html|GPS shield]]
  *[[http://www.ladyada.net/make/waveshield/index.html|Wave shield]]
  *[[http://www.arduino.cc/playground/Learning/SDMMC|Interfacing SD / MMC Card with SPI]]
  *[[http://www.zen35383.zen.co.uk/stnield/psxpads.txt|PlayStation PAD/Memory Interface Protocol]]