At 05:55 17/08/98 PDT, you wrote: >Can anyone give me a good example or just a good site where i can >understand the how to of checksum's?? I'm doing serial comm and i need >some kind checksum's to make sure everything works fine. Better is to use CRC instead of checksum, an good explanation is with the DALLAS DS1820 data sheet and some code sample (C84) are available with UMPS project examples. Regards, Philippe. +--------------------------------------------------------+ | Virtual Micro Design | | | | E-Mail: p.techer@idls.izarbel.tm.fr | | URL: http://www.sistudio.com/umps | +--------------------------------------------------------+