Fun, now we can transfer an OS easier and much less painless, now I may try PedroM. *Goes off to use FreeFlash*

"is intended to be more flexible and newer" Just out of curiosity, how can something be intended to be older? ;)

The person creating it makes it that way.

In this particular case, I imagine Michael was trying to say that the program was intended to be more flexible as well as it is newer than TIB Receiver. But, seeing as how I didn't write the article, I can't really say much to that.

His point is that it's impossible to make new things that are older, rather than newer, than previous things. Y'know, what with our perception of time being linear...

Unless PedroM support HW3, I'm not even going to try. :)

You can get a Titanium version of PedroM (linked with the TIGCC linker) at:
http://www.tigen.org/ kevin.kofler/ti89prog/ pedrom-ld-tigcc.zip
(remove the spaces).

Owning a TI-89T myself, I took a look at the PedroM. It has a few advantages over the operating system that comes with calculator. However, one major drawback is that it does not have a CAS. The CAS is one of the main advantages that it has over other calculators. Without it, I would be perfectly fine with my ti-83+ (you don't buy a calculator just for games, right?) so I do not see the purpose of using PedroM.

The purpose of using PedroM is that it's a 3rd-party operating system. It's been over a year since I've taken a look at it, but from what I can recall, it's actually fairly decent.

Hmm not having a CAS is like a gun with no bullets...the best you can do is throw it at your teacher and run :P

School shooting jokes are so April 1999...

What is CAS?

Computer Algebra System

So what is it? Does it receive an OS or does it sign the OS? The article says it does both but only one is needed. If it signs it, you dont need a receiver.

The documentation explains that the "signer" doesn't actually sign the OS, but it replaces the MD5SUM with a specific invalid one, which the receiving part coaxes the boot code into accepting without a signature check.

I saw an articel abou this in TI-Gen, it sounded so impressive I couldn't help but read further! I'm actually really impressed with his work and many of the french programmers in the TI community.

On a side note, I officially have the coolest amount of dowloads this week:

"Ranked number 8 in our list of most downloaded authors for the past seven days with 1337 downloads." :-)

PH34R M0RG4N D4VI35 TH3 M05T L33T D0WN04D3D 4UTH0R 0F TH3 W33K W00T!

I much needed step in the development of third-party operating systems. Good work!

Woops, that "I" that started the sentence was supposed be an "A". I don't know how that happened, being that A is on the complete other side of the keyboard... Must be some subconscious thing A need to be worried about.

now to get this on other calcs....
why not get the ti-os on another device. this os done on palms but how about a nds? http://ds.rorexrobots.com/calc/
w00t

I don't know why anybody would use PedroM, other than to show off for a few days "look people, a non to-89 os! rotfl haha.."

Really.. I dont enjoy typing unix commands on my unix pc, so why would I trade my cas, for typing?

I mean sure, its cool and a big development step. But it seems like some that that should be idolized for its acheivement, and not actaully used.

On the other hand, now that the community has a newer tool for installing os's on the calc, maybe someone can make one with CAS, a kick ass GUI, and basic support? That would be pretty sweet.

)>-TiAtari-<(

You'll be more in need of a development tool than a sending tool for that though. But I have good news for you: TIGCC supports Flash Operating System development. Documentation is pretty lacking though, so you're best off asking me for details if you seriously want to get into such a project. Or just look at the Punix project, which (unlike PedroM) is using the TIGCC Flash OS support.

Then just use AMS. It has a nice GUI, it supports BASIC, and it's continously updated and improved.

I have read that its code gets worse over time

<<it's continously updated and improved>>
*Choke* What was the last major feature added to AMS? The Desktop? How long ago? :)

I personally see PedroM as a basis for development that could not be realized on AMS (requiring for example huge storage space, OS-level hacks, unexisting OS services, direct access to protected I/O ports and Flash memory...)

-- Olivier Armand

The fundemental problem with trying to make third-party CAS is that, basically, nobody knows how. Even at TI, they probably had a team of a dozen people who worked on that aspect of the OS alone. And I'm not talking about programming it, I'm talking about actually figuring out how it will work! I've never seen an open-source CAS before, for the computer or calculator. But frankly, it's such an amazing piece of work that I don't mind paying for it.

There are a few Open Source CASes. Search for xcas, Yacas and Maxima. None of these can be easily ported to the calculators though.

Actually, they didn't. They simply bought Derive.

Well, alot of algebra can be done simply by string ("expression") parsing / manipulation.

some math is easy to implement:
-trig = trig tables
-! factorial = simple recursive function
-unit conversion = simple ratios
-floor / ceiling = 3 lines of basic code
-GCD / LCM = some easy set theory logic

of course more difficult things such as derivitives, integrals, summations, solving, etc, aren't simple to implement, but integral tables do exist, which have generic forms for most common integrals...

anyway, don't get me wrong, I'm not claiming to be some super math genious, but is there anything wrong with what I said?

my two cents

)>-GTAtari-<(

It is not so simple :)