Didn't Olin ment directly from the silicon, not from the outside of the package. I think the rev no is readable with the "right" programmer. Jan-Erik S=F6derholm. Spehro Pefhany wrote : >At 05:33 PM 2/17/2003 -0500, you (which was Olin...) wrote: > > > >The easiest way is to read the revision number directly from the = chip. > >How? > >For example (grabbing one close at hand), PIC18F452-I/P 0207GSP > >Is that a B3 or a B5? -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics