I am currently switching an old design using the Pic-C 1.21 compiler to the C17 compiler. After adding the linker files and renaming a lot of bit variables it compiles and works but will quickly hang or get lost seemingly because of interrupt problems. I had this problem with the Pic-C 1.21 years ago and the problem was because of bank switching. I am using the large memory model. Any suggestions would be appreciated. Scott Ammerman EMerge Interactive 10315 102nd Terrace Sebastian, FL 32958 -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics