Keith... Yes - I hooked up a PIC16C64 to a 2.5" laptop harddrive as part of a MP3-player project http://www.codepuppies.com/~ben/sens/pic/mp3 I used ata3-r6.doc as a guideline. I just did a web search on ata3-r6, and found a copy for download here: ftp://fission.dt.wdc.com/pub/standards/ata/ata-3/ATA3-R6.EXE Hope this helps. Cheers, Ben Keith Causey wrote: > > Has anybody here ever interfaced a micro-controller to an IDE device? If > so - where did you find the IDE specification and pinout? Thanks...