>> how would you preserve the timing? > > 1200N71 > That's fine for the single output line, but that implies some (limited) 'intelligence' on the other side of the serial port. IMHO that spoils the idea. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products docent Hogeschool van Utrecht: www.voti.nl/hvu -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist