On Wednesday 28 September 2005 02:58 pm, Richard Prosser scribbled: > I have a system under development at the moment that stores two copies > along with complemented checksum (to avoid the "All Zero" trap). I am > using it for record lengths of between 1 and 50 or so bytes. Ah-ha! I did something along those lines (inverting all or alternating bits in the different instances of each dataset), but it was more based on a hypothetical possibility (that the chip could get erased, etc), rather than a know problem. So, you want to share details of this "All zero trap"? Cheers, -Neil. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist