Re: Possible way to do assembly on TI-82!
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Could as many people as possible with a TI-82 please reset their calculator,
back it up to a file on your computer, follow the instructions below exept
for pressing P, and then try and back it up again, if it doesn't freeze your
calculator first. After you back it up a second time, try pressing P and
then if your calculator is still running, back it up again. I am going to
try and figure out exactly what it is doing. From what I can tell so far,
for some reason, this messes up the variable pointers in memory and when you
try and view a variable (like P) it doesn't get the end of variable character
so it keeps on going through the whole memory. From what I can see right
now, my guess is that there is a probably about a 25-30% chance that this
could be used to run assembled programs on the TI-82. If anyone else would
wan't copies of the backups that I recieve, please E-Mail me.
Riley McArdle
griffon@the-lair.com
http://www.toptown.com/hp/griffon/
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> From: Brian Ryner <bryner@maplecity.com>
> To: griffon@the-lair.com
> Subject: Possible way to do assembly on TI-82!
> Date: Friday, October 25, 1996 3:55 PM
>
>
> I saw a posting in the Calc-ti newsgroup about a bug in the TI-82 which
> could allow the use of an assembly shell, and I have experimented with it
> and found it to be true. The problem is, I'm not exactly knowledgable
> about assembly, but I do think I have found a way to get some of the ROM
> code from the calculator. Here's how to access this "assembly mode":
> Warning: BACK UP YOUR MEMORY FIRST!
>
> 1) Clear out all of your Y= expressions, except for the first one, make it
> something like Y=X or Y=X^2
> 2) Create a new program and put this in it:
> Shade(1,3,4
> Don't press enter at the end of the line.
> 3) Exit the program editor, go to Draw and do a ClrDraw.
> 4) Run the program, and while it's drawing the graph, press ON.
> 5) You should see a cursor. Now, depending on what you type, the
> calculator will do strange things. For example, use Y=X^2 for the
> equation, and then when you get the cursor, type P and press enter. The
> screen will flash with all sorts of strange characters.
>
> You will probably need to remove a battery and replace it to be able to use
> the calculator again.
>
> Typing different things when you get the cursor produces different results.
> The results can also be changed by whether or not you press enter after
> the Shade command, which numbers you use in the Shade command (only certain
> combinations work), the equation you have entered, and of course what you
> type when you get the cursor.
>
> Now, when I was playing around with this, somehow the calculator put part
> of the ROM INTO the program I was running. I haven't been able to repeat
> this, but fortunately I was able to send the program to my computer. I've
> stripped off the .82p header and checksum bytes at the end, and I'm
> attaching this to this e-mail. I don't think it's the WHOLE ROM, but it is
> something to start with.
>
>
> Brian Ryner
> email: bryner@MapleCity.com
>
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