Panda Did you read and understand the comments about the stack NOT being re-entra= nt? According to Matt It is not intended to work properly when it is used by more than one "channel". Are you getting failures in your experiment one or experiment two or both. Russell --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .