Hi, I have been looking at the 16F device programming specifications and notice a number of differences in the algorithms. This lead me to think, which of all the 16F's are the most used in peoples projects, there are such a variety. Are there specific must have devices? I think I mentioned before we are developing a portable battery powered PICmicro programmer, and was hoping to get a little more of an insight of how the device has developed over the years. My knowledge is with the Atmel AVR device, and as I have been developing for that beasty from the beginning, I know all of the past ISP pitfalls and changes that have been made to the devices as the years go by, and understand how useful it is to have that sort of info. Bryan Software Engineer - Embedded Results Ltd trading as www.kanda.com -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.7.2 - Release Date: 11/03/2005 -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist