Hullo all, Am i likely to encounter any problems programming either PIC16F874 or PIC16F74 using a commerical programmer which i have already used on the PIC16C74? Also, what about in-circuit serial programming? would the procedure be the same for all three processors? many thanks, Mark Adcock ------------------------------------------------------------------------ Griffith Elder and Company Ltd. Rougham Hill Bury St. Edmunds Tel. +44 1284 763616 IP33 2RU England Specialists in electronic weighing systems ------------------------------------------------------------------------ -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.