Topic: Multiversion Compatible Tsop Tutorial (Read 6394 times)

rgtaa · « **Reply #75 on:** June 10, 2003, 08:00:00 AM »

hopefully a few electronic's guys can straighten us out!

and give Radio Shack part numbers ... for the right resistor , and update the tuturial ... to reflect this NEW development.

rgtaa · « **Reply #76 on:** June 10, 2003, 12:33:00 PM »

The Dude!
Thanks alot!
You put my mind at rest... and you are also OPEN and Checking with your friends as to future updates!
That is all i need to know to feel comfortable ... and to know when you find out the answer you will post it!

You are really a good communicator!

Thanks again!

black_light · « **Reply #77 on:** June 10, 2003, 02:01:00 PM »

when u say 15 ohm or watt resistors do u mean 1/2 or 1/4 watt and ohm or watt. also is it 15k or just 15. thanks for the help, i would rather pay an extra .5 of a penny just to be safe.

majik655 · « **Reply #78 on:** June 10, 2003, 03:16:00 PM »

I too am confused.. but I beleive it is just typing that is confusing some of us..

10k ohms not 10ohms correct? He stated 101 said 10k and he knows his shit..

but then The_Dude said 10-20 ohms and left out the K so I am assuming 10K..

however I also want to know 1/4 watt or 1/2 watt.. I have asked this before and people have stated it doesn't matter.. there is barely a difference but I say there is .. double the difference.. what entails I don't know but 1/2 is twice as much as 1/4 lol

Anyway 10K 1/4 or 1/2 ??

black_light · « **Reply #79 on:** June 11, 2003, 03:20:00 PM »

any news from the author?

rgtaa · « **Reply #80 on:** June 12, 2003, 05:09:00 PM »

LOL!

The way you write makes me PANIC!

But ... it's better we find out sooner ...than later! ...

Especially the part where 3 of your Friends Xbox's Died! ....

fur_to_the_third · « **Reply #81 on:** June 13, 2003, 12:35:00 AM »

Hi Chaps

Sorry if this post doesn't quite look right - my first one on the board.

I've followed the tutorial - everything works great, except I made one small change - if you follow the tutorial, then your xbox will be modded when A19 is pulled high, and you'll boot orig bios when it's grounded.

With all the talk of potential heat problems, and resistors, I figured that it's better (at least for me) to flash the bios's the other way round - so you're booting the modded bios when A19 is grounded.

Seems to me that you'll be booting modded more often anyway, so why stress the MCPX?

Also something that I think is missing from the tutorial - the first thing I do when doing the 007 hack is to take a copy of the original bios (raincoat -r orig.bin). You can then split in half using your favourite method and you'll be sure to be flashing the top half of the TSOP with the right image. It's always a nice feeling when you split the orig.bin, take a checksum and it exactly matches on of the ones available on xbins.

Think that's about it - bloody amazing hack, I now have a fully switchable modded xbox for the cost of a switch.

fur^3

fur_to_the_third · « **Reply #82 on:** June 13, 2003, 12:39:00 AM »

QUOTE

You could use a larger resistor, 10R, say, to force to 0V.

Erm, does this mean that there is still the potential problem with A19 is tied to ground? If so - forget most of my last post!

I'm no electronics expert, but it would confuse the hell out of me if this was the case. If voltage = 0 then surely there's no current or anything... hmmm...

Can someone clarify this?

maximilian0017 · « **Reply #83 on:** June 13, 2003, 03:02:00 AM »

Umm, it's not that easy i think

A18/19 are switching all the time between vcc and ground, Every time certain images of the tsop are accessed these switch between the images.

So if you tie A19/18 to Gnd it would sometimes short the Vcc coming from the Mcpx.
And if you tie A19/18 to Vcc it would sometimes short the Gnd coming from the Cpu Mcpx.

So without a resistor the internal a18/19 transistor in the Mcpx will be shorted some of the time, all the switching power of this transistor will be converted to heat trough its internal resistance.

I'll try to find another x-box and try the resistors, ofcourse i'll let you know.
I've got the same problems with free time as "the Dude", but i will try to help.

And don't worry about those 3 people who had their xbox blown, I see a lot of these because i sometimes fix xboxes for people.(p.s. i don't sell modchips, i only repair xboxes)

For the last time:
This is a possible solution for a possible problem so please don't go

about it, no one with this mod has the resistors in at this time and almost none of them have problems

The same way of hacking is used for the LPC and the homebrew mods.

The Dude · « **Reply #84 on:** June 13, 2003, 08:15:00 AM »

One more thing to add,

fur_to_the_third did make a very good point about forcing 0v to the modified bios if that is your primary use. Personally the modified and retail bios share just about the same load on my xbox, because i do have many retail games that are played, so it would not make a difference to me. 0v does seem like the less likely culprit for problem, but if my understanding is correct of electrical signals, ground is still current, just negative current. I would not however mess with the switch while the xbox is on. Turn the xbox off before you plan on flipping the switch because you greatly increase your chance for a short doing that. Any Jackasses out there that think you can launch a game from the hdd using a modified bios, then switch to retail to jump on xbox live will find themselves banned really quick. Xbox live checks the bios you initially booted your xbox on, not the current bios selected.

IndieRockSteve · « **Reply #85 on:** June 13, 2003, 08:37:00 AM »

Max, how do you know they flop from vcc to gnd?

I'd like to help, since I seem to have a v1.0 box and I have quite a bit of electrical engineering background.

we should try and analyze what the chip does under normal operation to figure out how to best lock out the two halves.

rgtaa · « **Reply #86 on:** June 13, 2003, 08:51:00 AM »

we should only switch BIOS if XBOX is TURNED ON ... if we are planning on Flashing the other side of Chip ... right?

For example ... if a started in bios 1 ... and then went to flash the program ... before lauching the actual FLASH ...i could flip the switch ... then FLASH ... and this should be ok ... right?

just a once in a blue moon thing!

Right?

majik655 · « **Reply #87 on:** June 13, 2003, 10:38:00 AM »

QUOTE (ruffles_x @ Jun 13 2003, 10:53 AM)

Im sorry if i sound stupid but i need to confirm this, this is what i need to do?
user posted image

Thanks

no you need to get a switch with 3 legs.. not 2

left leg = gnd

middle leg = a19

right leg = vcc +5

of course vise versa lol as long as a19 is in the middle and other 2 on their own leg.. you are set.

rgtaa · « **Reply #88 on:** June 13, 2003, 10:42:00 AM »

NICE PIC!

The Dude · « **Reply #89 on:** June 13, 2003, 11:34:00 AM »

rgtaa to answer your question, yes it is ok to flip while the xbox is on, just don't make a habbit of it. If you've got obsessive compulsive disorder, don't keep flipping the switch for no reason at all. And second, ruffles, you're all fucked up dude. YOu do it that way you'll have one confused damn tsop. You need an SPDT switch, your picture there is a SPST. SPDT = Single Pole Double Throw, you pic is i understand is a Single Pole Single Throw. SPDT basically closes the switch in both positions while the SPST is closed/open. Last i belive vcc is 3.3v not 5v if you are tapping the lpc.

Author Topic: Multiversion Compatible Tsop Tutorial (Read 6394 times)