Hi Vidal The second one is a 16F877 20Mhz not a 16F877A. I had the same problem and I asked the question to the supplier. regards Luis -----Original Message----- From: Vidal [mailto:vidal@WEBSPEED.DK] Sent: 10 February 2004 15:06 To: PICLIST@mitvma.mit.edu Subject: [PIC:] !6F877A - I/P versus PIC16F877-20/P I have bought two 16F877 from two different sources. Is there a difference between the two? Label 1reads - 16F877A - I/P the other PIC16F877-20/P. I was supposed to have 16F877A 20 Mhz. Regards Vidal -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu