The PIC Handheld programmer will not work with my circuit. Are there any special circuit requirements?
The Handheld programmer (and Keyfob) do have some limitations, in order to protect the programmer from faulty circuits. Extra circuitry on programming lines can create problems and so can some reset circuits. A recommended circuit can be found in the Quick Start Guide:
Quick Start Guide Handheld.pdf or
Quick Start Guide Keyfob. pdf