Yeah, it is cool! Can't wait for some games to come out using this engine!
w00t!

Hi, did you read one of my past posts?
I cracked ti's RSA and MD5 encryption scheme and was able to figure oout how to transfer a custom os. Right now i have a basic linux that boots and says "HI"
But the nice thing is is that on the calc if you take out a batt., hold del, while holding del put in batt, that will allow you to transfer the os

Is this for real? I've been looking forward to this kind of stuff since those message boards about putting Linux on the TI-92+ way back in 1999 or something. I just hope you're not pulling our legs. Not a good joke, though, if it was.

It's for real. I have done a basic linux on the 83+ se and i can't release how i did it because it is not fool-proof yet and will make calculators inoprable for days, even if you leave the batteries out for 2 days you have to do odd things to get it to work

I understand. You need to make a consistent and straightforward way for anyone to install/uninstall the OS.

Anyway, can you tell others how you did it so that others can start to work on developing new OS's?

Sorry, for the moment it requierd me to buy 5 more ti-83+se's of of e-bay and take one, remove a chip and replace it with another one that was compatable. i sent the chip to a lab so the encryption keys can be extracted and the chip's plans layed out and given to me

That's way too much work.

And ican't really tell how to make it because it is very confusing even to the expert programmers. you would need experiance in boot-sector coding and building a basic sys in asm. and you can't use rom calls or include files that are pre-made

I don't want to spoil your fun, but ever noticed that that big rambling hard disk in our calculators has linux preinstalled.
Just thought i should mention.

</sarcasm>

That's an extremely impressive claim, however you must prove it. I know how to code boot sectors, structure a complete OS, and program Z80 ASM. So how about e-mailing the steps to me to accomplish this?

umm, did you read the post about the fact that i had to make a circut change and replace a chip??
you got 5 extra calcs to play with?
you got $9500 to spend on a bunch of lab boys revese engenering chips?
just thought i would ask.

This just proves you are lying...Because seriously the answers are yes and yes...I've got 3 83+s and 2 SEs...

Hey! Has anyone actually talked to TI about the development of an OS? You or some of the other people at Detached Solutions or Radical Software might be given some information, because they include some of your apps in the SE!
Well, I don't know.

I think those apps are just included on the calculator when you get it, but they're not part of the OS.

Hey! i replaced the flash rom chip

and link logic circut

AND the boot sector is 300 BYTES

Wouldn't it be more like a boot page than a boot sector?

Why would you need a boot sector/page for a TI calculator OS? After all, the OS is pretty small and it's always running. So what would be the purpose of a boot sector/page?

it is important to have some rom that can never be corrupted so that if an os install fails you can try again.

ummm, ti has some real rom, not flashable, that allows os install

umm, linux would need one because if you took out batt how would it start? and this one you have to shut down and start up cause that was eiser to code

Re:!!!!!!!!!!!!!

A man is walking along when he sees a funeral procession going by, the
longest procession he's ever seen. It seems to consist of the hearse,
followed by a man with a Doberman on a leash, followed by several hundred
other men. After watching for a few minutes, he can restrain his curiosity
no longer, and walks up to one of the mourners.
"Excuse me, sir, I don't mean to bother you in your moment of grief,
but this is the strangest procession I've ever seen. What happened, who is
the funeral for?"
"Well, it's nothing special, really, the funeral is for the mother-
in-law of the man at the front of the procession. You see, his Doberman
attacked and killed her."
"That's awful!", replies the onlooker. "But... um... tell me, you
don't think he'd let me borrow that dog, do you?"
"Get in line, buddy," replies the mourner, "get in line."


LMAO
wish i could have the dog to...

Heh, that's good too. And, I think I figured out what LMAO means by guessing, but my guess is inaproperiate (I know I didn't spell it right, and don't bother to fix it) and probably wouldn't be too good on the message boards.

"Laugh My Aft Off" ;-)

Haha, I was right!

I know, but TI includes some of the applications that they've written.

Are you an evil hacker or something? You're always mentioning in your posts about hacking into places. Is it easy or hard to do that?

Thanks for making the distinction... I myself am a benevolent hacker. I only hack for a good cause.

Hm... I want to learn how to hack. I'm felling suddenly left out :) (I like smilies! :):):):):):):) )

www.astalavista.com/library

library? What is that for?

hacking docs and tutorials

<interested>Oooh! Okay!
<!-- no closing tag for <interested> because I'm probably never going to be not interested in that -->

I like HTML
I like Javascript
I like TI-BASIC
I like Assembly
I like Java
I like C
I like C++
I like Perl
...

Evil hacker? What's that?

ummm, evil hacker=ME!
MWAHAHAHAHAHAHA
plus, ti-calc.org has plenty an embarasing code errors
if i wanted to i could gain full access to ti-calc.org but i would never do that cause its my favorit web site. :-)

Yeah, it's probably my fav website too.

Mine too!

PARADE FOR TICALC.ORG!!!
PARADE FOR PATRICK DAVIDSON!!!

ALSO PARADE FOR MICHAEL VINCENT!!!
ALSO PARADE FOR CHICKENDUDE!!!
ALSO PARADE FOR EVERYONE (-FOCUSEDWOLF AKA DEPLEATEDURANIUM)

I would come up with some witty remark, but im laughing too hard to think! LOL your a hacker LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL LOL

Breaking RSA requires no more than five lines of code, and MD5 is almost as easy. TI would never use much encryption (if any) on their OS because it takes too long to decrypt it. They would never use such weak encryption algorithms either.

Also, 500Gb hard drives do not exist.

uhh, ever heard of raid-5 special array harddrives?
didn't think so
gimme $800 and i'll give you one

A RAID drive provides instantaneuos true error correction usin g3 disks and the RAID car ditself costs thousands. You have to be:
1)Stupid
2)Crazy
3)Stupid and Crazy
4)Need real-time error correction that I would love to have but couldn't b/c only a snob... super nerd... corporation... or other type of intense data storage and retrival network wiht tons of money I would pray to have would have them.

I hope I make myself clear....crystal clear....

umm, RSA is one of the worlds strongest encryption scheams. But ti used 56-bit keys

What exactly IS the point in using encryption on a calculator? Isn't like there's any sensitive information on it that can't be accessed through the normal user interface ...
Besides, a 56-bit key sounds a little off ... don't they use bit bit-lengths that are powers of 2? Like 1 bit, 2 bit, 4 bit, 8 bit, 16 bit, 32 bit, 64 bit, 128 bit? (I don't think I saw 56 bit in that list ...)

No, encryption lengths generally are any multiple of 8 bits. Besides, you should have heard of 56-bit encryption, it and 40-bit are only the most publicized, well-known cipher lengths...

My bad ... but I still stick with my original statement of there being no point in using encryption on a calculator ...

I'm thinking that the encryption is only used to verify that an OS is valid. There's probably some sort of certificate that is "sealed" with encryption. This is one of the obstacles of us putting our own OS's on the calculators. Fortunately, gary has cracked the encryption, which brings us that much closer to replacing the OS.

Of course, if word of this got to TI, they would probably change their encryption or something to ensure their OS stays on the calcs.

But it won't matter if we don't upgrade our calculator/buy a new one...

yeah, they already change them enough. (Grumbles about AMS 2.05 stuff again) OBTW, I got bigdyna to run on my 82 with the HW2PATCH and PreOS, and some other stuff like that.

82?

yeah, you found the mistake before I did. I meant 89, but you probably already knew that. :)

AMS 2.05

HUH? Isn't that what he said?

crud, I meant 89

parity checks use xtra bits

besides, ever heard of 1024 bit? that's a power of two to

and i meant 57 for that parity bit

1 2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768 65536 131072 262144 524288 1048576 2097152 4094304 8388608 16777216 33554432... can I stop now?

NO!!!
67108864 134217728 268435456 536870912 1073741824 2147483648 4294967296 8589934592 17179869184 34359738368 68719476736 137438953472 274877906944 549755813888 1099511627776 2199023255552 4398046511104 8796093022208 17592186044416 35184372088832 70368744177664 140737488355328 281474976710656 562949953421312 1125899906842624 2251799813685248 4503599627370496 9007199254740992 18014398509481984 36028797018963968 72057594037927936 144115188075855872 288230376151711744 576460752303423488 1152921504606846976 2305843009213693952 4611686018427387904 9223372036854775808 18446744073709552616 36893488147419103232

I'm not quite sure if that last one is correct...

Hey that last one is 2^64, or 2^(2^(2^(2*3))). Cool.

It's only 2^(2^(2*3)).

2^(2^(2^(2*3))) would be 2^(2^64), which is a HUGE number.

<slaps forehead several times>
stupid stupid stupid!!!

oh, and I redid the math with the windows calculator (anybody know of a calculator that holds more than 32 digits?) and chivo's last power of 2 (the one that ended 3232) is actually 2^65. I should have checked my work before posting. geez, and I thought I was a math nerd.

i made this program about a year ago:

DEFINT A-Z
DIM a(15)
DIM c(16)
a(1) = 1
SCREEN 12
OPEN "p2.txt" FOR OUTPUT AS #1
DO
FOR d = 1 TO 15
a(d) = a(d) + a(d)
a(d) = a(d) + c(d)
c(d + 1) = INT(a(d) / 1000)
a(d) = a(d) - c(d + 1) * 1000
NEXT
IF b < 100 THEN
b = b + 1
PRINT b; a(15); a(14); a(13); a(12); a(11); a(10); a(9); a(8); a(7); a(6); a(5); a(4); a(3); a(2); a(1)
PRINT #1, b; a(15); a(14); a(13); a(12); a(11); a(10); a(9); a(8); a(7); a(6); a(5); a(4); a(3); a(2); a(1)
END IF
LOOP
close #1

Nope!
*
18446744073709552616
should be
18446744073709551616
and
*
36893488147419103232
should be
36893488147419105232

You're right about the first, but I was right about the second.

5444517870735015415413993718908291383296

Is this one correct? I think it's the longest number allowed on here.

(this is one whole number)

1797693134862315907729305190789024733617 9769789423065727343008115773267580550096 3132708477322407536021120113879871393357 6587897688144166224928474306394741243777 6789342486548527630221960124609411945308 2952085005768838150682342462881473913110 5408272371633505106845862982399472459384 79716304835356329624224137216

That's 2^1024 !!! That's as high as I'm going.

Oops, yep. My bad.

No. It isn't. Technology review printed an article about DVD 'piracy,' and they even printed the code to decrypt DVDs and RSA (the RSA code is in a little sidebar thing). A link to the full text of the article is entered as my url above.

And when I said that 500Gb hard drives do not exist, I meant as a consumer product in 2.5in form factor. IBM has a technology that promises to be able to fit this much storage into one drive, but it still does not work inexpensively.

ok.

but the 128-bit RSA is one of the strongest encrypt alithograms avalible. The RSA i talk about uses the private-public key pairs. likein PGP (Pretty Good Privacy)

......o
........o
...___.o
|\/..o\
|/\___/

Ignore dots

.........\
.........}\
...`\...'..\
....}\/.~~.o\
....}/\..))._}
...,/./`.../`
.........}/
........./

Ignore dots

A sheet of paper crossed my desk the other day and as I read it,
realization of a basic truth came over me. So simple! So obvious we couldn't
see it. John Knivlen, Chairman of Polamar Repeater Club, an amateur radio
group, had discovered how IC circuits work. He says that smoke is the thing
that makes ICs work because every time you let the smoke out of an IC circuit,
it stops working. He claims to have verified this with thorough testing.
I was flabbergasted! Of course! Smoke makes all things electrical
work. Remember the last time smoke escaped from your Lucas voltage regulator
Didn't it quit working? I sat and smiled like an idiot as more of the truth
dawned. It's the wiring harness that carries the smoke from one device to
another in your Mini, MG or Jag. And when the harness springs a leak, it lets
the smoke out of everything at once, and then nothing works. The starter motor
requires large quantities of smoke to operate properly, and that's why the wire
going to it is so large.
Feeling very smug, I continued to expand my hypothesis. Why are Lucas
electronics more likely to leak than say Bosch? Hmmm... Aha!!! Lucas is
British, and all things British leak! British convertible tops leak water,
British engines leak oil, British displacer units leak hydrostatic fluid, and
I might add Brititsh tires leak air, and the British defense unit leaks
secrets... so naturally British electronics leak smoke.
-- Jack Banton, PCC Automotive Electrical School

You might get flamed by British people on that one. :)

For everyone who doesn't understand...

The RSA cipher is, in a way, the most powerful encryption in existence (available to the public). What is different about RSA is that it works on a public-key system. This means that rather than worrying about trading secret keys, anyone can send an encrypted message but will be unable to decrypt one, even their own message. Each computer has TWO keys, a public and a private key. Information can be encrypted with the public key that can only be decrypted using the private key, and vice versa. The reason for this is that the encryption includes a one-way function - in the case of RSA, the multiplication of two large prime numbers. Cracking an RSA key requires factoring an enormous number into two other enormous numbers. This is easy enough to describe, but very tedious in practice. With the exception of quantum computers (which I'm sure already exist, but those who have them aren't talking) breaking RSA will probably never be efficient.

DVD's, on the other hand, work on a traditional cipher in the sense that they require a secret "master key." Unlike RSA, CSS is a very weak but convoluted cipher, with lots of XORing and shifting. It is possible to crack a DVD (as demonstrated by Jon Johansen) but it's much easier to just use the key that was stolen from the Xing player, which I will not post here but is very easy to find.

Now for the philosophical comment: DVD decryption has nothing to do with piracy - it is not necessary to decrypt a movie in order to copy it; the only reason to decrypt it is that you want to watch it.

Watching the DVD is exactly the point, and the movie industry says that decrypting DVDs through any method not specifically licensed by them is circumvention. As of the Technology Review article, there were no legal DVD players for Linux because none of them were licensed.

*Waits patiently for this useless string to be deleted*

Hi, did you read one of my past posts?
I cracked ti's RSA and MD5 encryption scheme and was able to figure oout how to transfer a custom os. Right now i have a basic linux that boots and says "HI"
But the nice thing is is that on the calc if you take out a batt., hold del, while holding del put in batt, that will allow you to transfer the *TI's* os back to it

uh isnt it the APPS key? On my TI-89 HW1 it is...

83+se