you can't just apply +5, and +12 for power and Vpp and have it work. there's timing issues, when it applies the voltage, which is first applied, to even get into programming mode. these voltages need to be controlled by the programmer. some newer JDM's use external supplies, but it still controls when they're applied to the pic.
as everyone has been saying, break down and buy the pickit2, or other.
by the time you build the cheapo serial one, buy a cable, waste hours upon hours trying to get it to work, you'll have spent way more than if you bought
the pickit (or other) in the first place..
here's the kicker, even after you get an enhanced jdm, get it to work, get/make external supplies for +5/+13, make a housing for it with switches etc, and tweak the software to run off your laptop with a usb converter...............
You'll end up buying a different programmer for the other features.!
(say um, pickit2? for serial i/o, logic injection/analyzer, etc..)
oh, and if code protect is on, it will always fail verification.. even if it programmed fine, it will be unable to read the code to do the verification. :/
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