The best low cost FAT12 / FAT16 code I have seen is at the http://www.prllc.com/prllc_homemainFlash.htm web site. The source costs about $139 US and is worth every bit of that amount. Be prepared to work in C.

I have looked at all stuff on the web regarding FAT file formatting for FLASH memory cards and come to the conclusion that almost all of it is junk. There is however good code also for free at the FreeDos-32 web site for FAT file system drivers but the nature of those drivers makes a lot of work to move it to a Harvard architecture processor.

And guess what....PRLLC is also offering nice sample code for MMC drivers!

Michael Karas