Thanks, I see it. MPLAB only reads it upon initialization of the PICKIT2 programmer, and the "PICKIT2" application does not read it at all. Interestinly enough, there is no revision number shown at all for the 16F505. Other part numbers easily at hand do show rev number. Cheerful regards, Bob On Fri, 28 Mar 2008 10:34:40 -0700 (PDT), "Funny NYPD" said: > Hi, Bob, > See attached picture, the 2nd pink-color marked part has a "b4", which > represented the silicon revision of the PIC18F458 chip I am using. You > should be able to read it on other chips from either PICKit2 or ICD2. The > toolset on the photo is a Au Group Electronics Edition of PICkit2. -- http://www.fastmail.fm - Access your email from home and the web -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist