Hi Philip, As I've mentioned before in a past post, using the Master SPI Bus Engine tool is a great way to learn how to use the SPI command set for MMC/SD flash modules before you commit to PIC code (especially if you have not worked with MMC/SD flash modules before). It sure saved me a lot of time when I was playing with a MMC module in the past, because you completely avoid the low-level "coding, compiling, programming the PIC, and testing" development cycle at the PIC level. When you become comfortable with the MMC/SD SPI command set using the Master SPI Bus Engine, it then makes it easier to develop your low-level PIC code. Best regards, Ken Pergola -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body