> did you remember to set port B as output before your 'flicks'? Yup, all LATB are output except one with a pull-up mov #0b0000100000000000,w0 mov w0,TRISB LATB,#0 does show the activity I set in a normal power-up Joe ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.5863 / Virus Database: 4328/9487 - Release Date: 04/08/15 --=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 .