Dreaded <target device ID 3FFF> - SOLVED

[Demon]

I pull out an old circuit with a 18F44K22, connect my U2, check the Device ID, but I used the JUMPER THAT WAS ON THAT CIRCUIT ALREADY. The darn thing worked. I swap for one of my 16F877, program, swap it to my new test breadboard on the left, and instant heartbeat.



All these days going nowhere, it was the fracking cable that came with the U2 USB programmer. I still have the super-short cable that came with my U2 Serial Programmer, and that one works fine. It's just too damn short so I had made a 2 inch version.

So I pull out the meter and start checking continuity on the jumper. This is what it looks like. :O



Insane...

Robert

[tumbleweed]

I've never used a U2, but that doesn't seem to match up to what's on the website...

[Demon]

No kidding.

There's a serious short-circuit happening in those header terminals. I think the cable isn't perfectly aligned at the ends, and the contacts rubbed alongside two wires.

I tested the one I made and it's all one-pin-to-one-pin, same as with the ridiculously short cable I got with the U2 Serial programmer (when I first started), as expected from a flat header cable assembly.

I'm gonna open it up later just to look inside. I'm just happy I finally tracked the the source of ONE of my "recent" puzzles.

Robert