Hi Don, I believe both 100R and 10K are correct. If you have a look how RB6 and RB7 of the target are driven (signals are named RC3X, RC4X to ease up orientation :-), there is 330R from the 'driving' pin and 10K to the 'sense' pin. ICD firmware undoubtly checks that the target does not override applied signal levels. Since the R33 goes to the so far unused RCX0 (supposed to drive target RB3), I guess the resistor value doesn't matter at all. Even if the RCX0 is used in future firmware upgrades, the sense pin will see correct level thru 100R as well as 10K resistor. Josef >BTW, I briefly looked at the schematic on your page. I didnt really >check it much, but I noticed one thing that might be an error, or >maybe its a microchip error that you have fixed. Anyway, you have >R33 shown as 10 Kohms, but in the schematic I got from >microchip, its shown as 100 Ohms. ?? ======================================================================= Electronical devices for chemical laboratory, custom electronics design ----------------------------------------------------------------------- Snail Instruments Josef Hanzal, M. S. Vojanova 615 phone/fax: +420-311-624433 266 01 Beroun e-mail: snail@iol.cz Czech Republic URL: http://www.vitrum.cz/snail/ GPS: 49deg58'28" North, 14deg 4'35" East ======================================================================= -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]: PIC only [EE]: engineering [OT]: off topic [AD]: advertisements