Re: A86: new news to some old news to others


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Re: A86: new news to some old news to others






Ekauq wrote:

> every rom call that you guys are finding are the same rom calls that the
> programmers of the ti-86 used to program the ti-86

The 86's ROM doesn't use any of the calls on ROM page 13, or at least very few.
These calls are for programmers like us to call, so that if a call might not be in
the same place in all ROM versions, it will be in the same place on page 13.  The
ROM doesn't need to make calls to this page because it can directly make calls to
page 0 (where you end up after a call to page 13).

>
>
> all of these roms mimic the commands that are already on the calculator, well
> i believe that they are one in the same.  for example, someone found a rom
> call that does the same thing as >frac which is true in the sense that it's
> the same rom call that the programmers used.
>
> one thing i would love to know is if there is a way to remove the original
> programming of the ti-86 and overwrite it with a completely new os, change the
> ti-86 completely, since what we all use is an os in the first place.  the only
> way i could see that you can't take it off is if the os is written in rom and
> protected (which is probably true).

I tried seeing if I could overwrite the calculators functions with my own ones,
but it will not work unless you use an interupt.But, if you really wanted to, you
could write a program that starts a certain shell every time the calc is turned on
and then never leaves that shell.

>
>
> but the question remains, did ti use all of the rom calls, or just the ones
> that it wanted to for the 86.




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