Multitasking and Process loops sometimes find a little overlap. The web site http://microdesignsinc.com/picbook/ does a good job of demonstrating non-blocking via time slicing. Although=20 it is 10 years back, the basics have not changed. The 18F452 has become=20 the 18F4520 and remains as my favorite user friendly PIC. Since the book=20 was new when I first bought it I emailed a few typo's for the project.=20 The book was used at Georgia Tech by the author, Dr. Peatman. He was=20 surprised that an old hobbyist would buy & use his textbook. I was=20 surprised that the author would bother to contact me! On 4/23/2013 1:46 PM, alan.b.pearce@stfc.ac.uk wrote: >>> Sorry for the typing errors above, that's what you get for having the >>> breadboard in front of the keyboard :) >>> >>> >>> On 19 April 2013 16:41, Chris Roper wrote: >>> >>>> Roam Black came up with what looks like a god one too: >>>> >>>> --=20 John Ferrell W8CCW That which can be destroyed by the truth should be. P.C. HODGELL =20 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .