Tjaart, for those of us without an electronics background (OK so you might ask what on earth are we doing on PICLIST -in my case the answer is 'Learning!') would you live to explain further the naming of Vdd, Vcc etc. >The PIC's are CMOS devices (That's why the power pins are markedVdd & Vss > instead of Vcc and Vee), Apologies for the off-topic bandwidth - hopefully one or two succinct responses will enlighten me (and other electronics neophytes) without infuriating others. Brian Brian Jones Technical Planner Java Technology Centre IBM Hursley