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[plaguereign]

jtag saver 1.0 by xbox1crew - http://www.megaupload.com/?d=813JSIMM

Jtag Saver 1.0 by Xbox1crew
3/24/2010


Reasoning behind the design:
We wanted a simple, easy, and effective way of shutting down the jtag when it wasnt needed any longer.
Trying a 555 timer circuit, the circuit worked well, but was too expensive for people to get behind. This revision
actually costs about 2 dollars USD to implement and works well, without all of the extra components that were needed for
our first revision.

What will Jtag Saver do for me?
It will, in essence, allow you to safely use your jtagged xbox 360 without worry due to extra voltage or current being applied
to areas that weren't meant to have them applied. This circuit will shut the jtag circuit off after 15 seconds to try and limit
the damage that could be caused after long periods of use.

We developed this circuit after a few boards died soon after jtagging. It was too close together to be coincidental. Most boxes
that died did so within a week of jtagging. THIS is the reason for our pursuit.

The circuit has been tested thoroughly. Many on/off cycles were gone through to make sure that it worked every single time. It did.
Optionally, you can add a resistor and LED to pin 7 to show you when pin 6 is shut off (goes high). A 220 ohm resistor should suffice, but
this part is up to the end user.

Parts list:
PIC12f629
Octal switch cbt3244ad,112
2 1n4148 diodes
1 100 - 470 ohm resistor (for the "jumper")

Disclaimer:
We have no responsibility for anyone's damaged equipment, or for any misuse due to this circuit. This circuit was designed as a help to the
jtagged system user. Everything needed to get this circuit functioning, once you have the parts, is included in this file.

Enjoy and THANKS!

Greets:
EMAXX
Redline99
HoRnEyDvL
c0z
GreenGian
IceKiller
cr4zie
Team XeDev
free60
and Microsoft for making this fun :-D

This post has been edited by HoRnEyDvL: Mar 25 2010, 11:57 PM

[ToBbErT]

So this basicly disables the jtag hack after its been booted? Im curious what the experts will say from this. If your correct about the extra voltage and the damage being coused then im definatly gonna make one. Im just wondering why the people from XH never noticed this so i doubt if this is really true.

[plaguereign]

I, along with quite a few people have had issues with this.  that was our reasoning for this design.  by taking the jtag out of the circuit when it isnt needed.  Any current or voltage that is added or dropped to a lower level can cause damage or malfunctions.  For example, if your pcs power supply isnt putting out 12v or somwhere in that neighborhood, things will not work/work correctly.
Thanks for your reply.

[Mindstrm]

Hello All,

I might be very new, correction, I am very new at the JTAG world but I have not heard of this at all and what further confuses me is that groups like Team Xecuter haven't mentioned anything about this even with their new release of the NAND and JTAG connectivity kits.  If JTAG's are dying wouldn't their be more posts about it?  Like I said I am still very new at this whole JTAG world but I think what this post says to me is wait a little bit till the experts figure out if we are all fu*king up our xbox's by JTAG'ing them!

[juggahax0r]

I have heard reports from local people of this issue as well. Of course Xecuter and Maximus aren't going to mention it , they are trying to sell a product that does just that. If this works well then we should see it added to the tutorials for doing the mod , as an integral part of doing it. My concern is how well it switches between games and homebrew stuff with this installed. I will check it out and see what its all about.

[ToBbErT]

And when is the jtag hack not required? Once its booted into a hacked kernel?

[SlickWilly440]

This is the first time about hearing about JTag'ed console having the potential to be fried.

So basically, according to the OP, the JTag is only needed during the booting of the 360 system and after that the JTag can be turned off  with the JTag Saver (15 secs after boot), and the 360 will still have the JTag'ed functionality, until the console is turned off?  

Did anyone have trouble opening the .tif file and seen a picture?  (B/c I did).  Also, is the .hex file for flashing the PIC?

I think I'll just wait for a full tutorial or do some more research on making this.  Until then, I'll try not to play the 360 so much.

[ToBbErT]

Yes the .hex is for the PIC, here´s the diagram http://img232.imageshack.us/img232/9965/jtagsaver.jpg

Its a little bit blurry becouse i just made a screenshot from the .tif

Anyone knows a good place where to get a Octal switch cbt3244ad? All the places ive been all charge alot of money for shipping. I need a store in europe (IMG:style_emoticons/default/sad.gif)

This post has been edited by ToBbErT: Mar 25 2010, 06:08 PM

[SlickWilly440]

QUOTE(ToBbErT @ Mar 25 2010, 12:00 PM)

Yes the .hex is for the PIC, here´s the diagram http://img232.imageshack.us/img232/9965/jtagsaver.jpg

Its a little bit blurry becouse i just made a screenshot from the .tif

Anyone knows a good place where to get a Octal switch cbt3244ad? All the places ive been all charge alot of money for shipping. I need a store in europe (IMG:style_emoticons/default/sad.gif)

Thanks for posting a link.

Based on that picture, there will probably be an open market to sell JTag Savers.

[jgsieve]

Will this solve those weird ring of light problems like having the whole thing light up or the wrong controller. Also, maybe this could stop it from being turned just from plugging in the power block

[akijikan]

Wow, I've been doing JTAGs since december and have done dozens, but I had no idea that the JTAG circuitry could actually be damaging the console as it is used.  But with the weird problems that show up in some, this makes perfect sense.  Wow.  Thanks.

[ToBbErT]

QUOTE(jgsieve @ Mar 25 2010, 06:18 PM)

Will this solve those weird ring of light problems like having the whole thing light up or the wrong controller. Also, maybe this could stop it from being turned just from plugging in the power block

The rol (ring of light) problem is related to XBReboot i think.

[crimpshrine]

This all sounds kind of pointless to me..

From what I have read and is being covered in a thread on xboxhacker, if something negative were to happen from the "JTAG" it should only effect the JTAG.  So for example if a unit did "die" due to a JTAG, XBR would just not boot.  It should be easy enough to determine what cause of death was on one of these units that supposedly died due to JTAGGING.  I have seen nothing yet to confirm anything, just people saying ohh well yea I heard rumors, etc..

Here is the thread at xboxhacker, I am sure there will be more posts by people that have a good understanding.  If Blackaddr does not sound too worried then there is probably nothing here..

http://www.xboxhacker.org/index.php?topic=14724.0

Out of 45+ units I have done, I have not heard of one single unit stop working anytime after JTAGGING.  99% of the units I have done are Jaspers so to me that is not surprising since they don't suffer from heat related failures.

Most issues I have heard about are with XENON's and doing anything with one of those units is like playing with fire (literally).  They die eventually due to heat issues.  Just handling one that has NOT RROD'ed yet that has play time on it, is a big risk.  

Stating otherwise without 100% proof that the JTAG is in fact responsible is just silly.  Looks like someone is just trying to drum up a possible new thing they can sell to protect yourself.

[SlickWilly440]

QUOTE(crimpshrine @ Mar 25 2010, 12:34 PM)

Stating otherwise without 100% proof that the JTAG is in fact responsible is just silly.  Looks like someone is just trying to drum up a possible new thing they can sell to protect yourself.

Yeah, but if someone on the internet that I have never met before saids one is needed to protect my console, then I'm strongly inclined to get one installed otherwise my self-insecurities will get the best of me and I won't be able to sleep easy at night.........


.....................        

But seriously, thanks for posting a link that allows use to get an alternative view on the situation.

[Aldanga]

crimpshrine pretty much expressed my thoughts exactly. I've done more unit exploits than I can count and haven't heard of any consoles failing (apart from normal cold-solder issues which are bound to arise eventually).

I find this mostly pointless.