I personally don't think the device with common SDI/SDO line be called "SPI-Compatiable". Thomas Rick Regan wrote: So the device (with the common SDI/SDO line) must be accessed "half duplex", as opposed to SPI, which clocks data in/out on the same pulse? Is this really SPI then? --------------------------------- Do you Yahoo!? Yahoo! Tax Center - File online by April 15th -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body