http://www.amazon.com/exec/obidos/ASIN/007033045X/qid=983053466/sr=1-1/ref=sc_b_1/105-4944617-8508707 This is the one I was referring to. Excellent book. Mine's on order! -- Dave's Engineering Page: http://www.dvanhorn.org Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body