Re: anyone have a jtag schematic -- Eye In The Sky

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Date Posted: 09:46:10 02/17/02 Sun
Author: Pex_nb
Subject: Re: anyone have a jtag schematic
In reply to: fred 's message, "anyone have a jtag schematic" on 20:09:14 02/12/02 Tue

>need jtag reader schematic or site where i can view
>schematic

Nice pic of a homemade jtag reader.
http://www.geocities.com/electronics1st/JTAG.html

I copied this months ago. Thought it may come in handy some time. I never tried it myself.
-------------------------------
Parts section:
I bought a 5 pack of 100 OHM 1/2 watt resistors from Radio Shack(wattage does not matter, 1/8 through 1/2 are fine).
Also I scrounged up a 25D(parallel) connector.
I also used a six inch piece of Cat5 cable I had laying around(keep it under 12" and you should be fine).

Connections to D25 section:
1) I soldered one wire to pins 18-25 on the D25 connector.
Really all I did was spread solder across those pins and then soldered the wire to it.
2) Soldered a 100 OHM resistor to each the following pins on the D25 connector.
Pins 2, 3, 4, 5, and 13.
3) I then soldered a wire from the Cat5 cable to the other end of each resistor.
4) I unplugged the IRD and unhooked all the cables to it.
Then I flipped it over and soldered the wires from the other end of the Cat 5 cable.
I counted the large pads on the right of the long ground pad by the following:
Top pad #1 etc. to the bottom pad #7.
Pad 1 and pad 7 are not used.
Next solder the wires that came from the 25D connector as follows:

Connections to IRD JTAG section:
Wire 2 to IRD pad 2
Wire 3 to IRD pad 3
Wire 4 to IRD pad 4
Now things change a bit:
Wire 5 to IRD pad 6
Wire 13 to IRD pad 5
Ground is easy, just solder the wire that came from pins 18-25 to the long ground block that should be to your left(no resistor on this wire).

Disclaimer:
That's it you are ready to dump.
From what I have read, this can be a dangerous way to hook it up(experts say a voltage spike can cause problems to both IRD and your computer) SO BE CAUTIOUS or do not use this method.

Software section:
I did NOT plug in the IRD till all connections were done and the computer was on.
I then ran the jtag_p.exe program.
It should show you the following:
IDCODE=2D4C9041(this is the most common code, there are others)
It will say it does not know that ID Code.
Just press y
Then where it ask's for starting address put 7FF80000
Then it ask's for length, put 80000
That will do a full dump(512K). It took a couple minutes on a 486 100 MHZ.
You can also do a partial dump to get just the Box Keys.
7FFFFFC0
0C
After dump is done, just open out.bin with a hex editor and read your keys.
They will be immediately after your IRD #.
I had to reverse the hex to use with Dish Net and left them the same order for BEV.
That's it, the Simple Jtag interface for Dummies!
Enjoy
Jim
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