Hi Tobias

Have a look at this page

http://www.piclist.com/techref/microchip/picstartplusicsp.htm

I program SMT PICs from 12F675 to 18F4550 with the PS+. It
will work with any PIC if you disconnect the PIC from the circuit
by switching (I use rotary). The PS+ is not designed to put out a
lot of power and cannot drive a circuit. If you can make the ICSP
pins (PB6, PB7) free that will make things simpler. I can usually do
this with the larger PICs. You can then use the circuit 0V and 5V
and need only manipulate MCLR. I've found that 50k-100k is OK
for a fixed pull-up, with PS+ MCLR coming in through a Schottky

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