> I am wondering if you have messed up the RA port initialisation > so that the rs pin is open collector without a pullup I wondered that too (a4 is usually the culprit). Richard is using a0, which is right next to input-only e3 / mclr Joe ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.6173 / Virus Database: 4450/10871 - Release Date: 10/22/15 --=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 .