It works generally, but some serial ports don't supply the 12 Volts, that is necessary. >>> Rod Wilson 13-08-97 10.52 >>> Hi all, Has anyone on the list built the LUDIPIPO PIC Programmer for the 16C84? Does it work? It seems to be a very simple design and looks ideal for a first attempt at building a programmer. Any help would be very much appreciated. Best regards Rod Wilson Email: rod.wilson@barclays.co.uk