Hi, Everybody........I'm very new in PIC, so I need your help to implement my first project, but I have several problem about PIC (16F84) programmer. Coz my budged limited, I decide to build by my self a programmer that explain in AN589, but I don't know : - Is AN589 suit and operate well for PIC 16F84 - What software I must use to program my PIC with AN589 - How to know the programmer that I build will operate well without program it first and run it in my circuit (try and error) - If I not wrong, our program code placed in Program memory (RAM) inside PIC, so If I finish program my PIC and shut down the Power to move it to my circuit, Will my program code discharged? or I must do it with In Circuit Programming ? Temporarily, that era all of my problem. At first, thank you for your help and reply. Best Regard, Ken Chang,