>Doesn't one normally tie both enables together and toggle between the two >drivers? I chose not to do this so I could (if neccessary) verify my writes to the bus were not getting trashed. Fair point though. Regards, Simon -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST