peter green wrote: > What programmer are you using and what is its VPP rise time like? It's not a issue of Vpp rise time, although too slow Vpp rise time can make this and a few related problems worse. I can demonstrate the problem with the right PIC using a USBProg, which raises Vpp from 0 to 13V in well under 500nS. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist