It had its day, but the JDM design goes back to the late 90's, so it's going on 15 years old. Much has changed since the 16F84 was king, and Microchip doesn't make things any easier with all of their little programming idiosyncrasies that crop up as parts evolve.in my experience, the jdm programmer I have used isn't reliable at all.
The JDM was always a bit troublesome because it derived its power from the RS-232 port, and as the years went by it seems as if PC manufacturers strayed further and further away from the established RS-232 electrical specifications. I always had better luck with parallel port "Tait" programmers. I keep a generic Tait and an old MELABS one around for programming the old OTP parts that the newer programmers aren't capable of programming.Oh, I didn't realize that the JDM sucked so bad. If I knew that I probably wouldn't have gotten it. I thought that it didn't really matter what programmer you had.
I think that's your best bet. Now you just have to decide if you want to go with a Pickit2 or Pickit3. I don't know why Microchip has to make things so difficult.I'll have to get a pickit. I thought that they cost $200, but I didn't look that hard. If that solves my problem then all is good.
Here are a couple of videos that hopefully will help you to decide.
Any pic that requires a Vpp-before-Vdd algorithm to program, and has MCLR disabled, internal oscillator will have problems with the JDM, as JDM cannot control the Vdd.
There's a work around to this in a JDM derivative on the net, but like everyone else suggests do get a Pickit2, it will resurrect your locked chips.
Alternately, try another chip, this time with MCLR enabled (as long as you arent using this pin in your design) and see if the problem gets solved.
Regards,
Anand Dhuru
It wouldn't surprise me if these missing features miraculously appear in the PICkit3 immediately after Microchip runs out of PICkit2 inventory.yeah, I never understood what microchip was trying to do with pickit3, and their refusal to provide continued support for pickit2 (a perfect programmer in my view).
And it worked!!!
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