Dear Friends I wrote my own pic programmer using the 16F87x specification # DS = 39025D. The question is: When I program the 16F84A the chip is totally programmed, BUT when I = program a 16F873 or 877 device the DATA eeprom do not accept = programming. Thank you for your attention. Vidal Microcontroller Solutions www.vidal.com.br -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST