Hi all, I'm trying to program a 16C84 with a low cost PARALLAX programmer and have some trouble: 1/ I'm obliged to program 3 or 5 times the chip to have the oscillator programmed for CRYSTAL and not RC 2/ I have the programmed chip (SMD), then sold it onto the board. I connect RB6,RB7, MCLR and VCC to the programmer in order to modify the program. Problem is as the chip is programmed for Crystal oscillator the programmer as many difficulties to read and program it. Does anybody know if it's necessary the oscillator section run properly to re-program a 16C84 ? Does somebody have the same problem with a parallax programmer ? Regards, Philippe. ------------------------------------------------------ Virtual Micro Design E-Mail: p.techer@idls.izarbel.tm.fr UMPS, the universal microcontroller simulator WEB: http://idls.izarbel.tm.fr/entp/techer/P01.HTM