Re: TI85 Phone Dialer (82 Bug)
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This is a multi-part message in MIME format.
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GTS wrote:
>
> after quite a bit of testing, i'm writing preliminary reports on an
> interesting TI-82 bug. i'm doing this so some of you with more time out
> there can see what can be done with this.
>
> WARNING: testing this will most likely cause the loss of ALL memory on
> your calculator
>
> now, if you put an equation in Y1 (i don't think the actual equation
> matters, just its existence), then use the shade command, and break the
> SHADE as it is drawing the graph of the equation, you can get some very
> interesting results.
>
> for example:
> Y1=X
> Shade(1,1,7 //no closing parenthasies.
> then hit ON to break the function as it is displayed, the message "Mem
> cleared" appears on the home screen, with a blinking cursor, and the
> program indicator (the line in the upper right hand corner of the screen)
> is running, indicating that there is some program in prgress. here's the
> kicker: the memory isn't cleared!!
> -the first two digits of the shade command don't seem to matter, but the
> third digit can be either a 4,5,6, or 7, to get interesting results. 5
> just locks up the calculator, 4 puts a cursor on the graph screen, and
> displays the current x-coordinat in small type somewhere on the screen (it
> varies). 6 does many different things. occasionally, it returns me to
> the home screen and displays the number 3.2E-128 in small type with a
> regular cusor below.
> occasionally, after doing one of the above, if you look at the memory
> information, it will say that there are between 22000 and 65000 bytes of
> programs, with 28000 bytes free, but there won't be any programs in the
> PROG menu!! if there are about 22K bytes in programs, and you run the
> Shade(1,1,6. then break it and repeatedly hit last entry, you will get a
> huge memory dump to the screen, faster than the display or output
> functions could ever do it. once, i got random horizontal lines appearing
> and disappearing on my screen, probably 10 or 20 lines flashing per
> second!
>
> some believe it possiblle to somehow enter assembler commands/mchine code
> using this bug.
> i would appreciate any information regarding this bug, and i encourage all
> to experiment (BACK UP YOUR MEMORY FIRST!!!!!!!!!)
> it has been known to work on ROM version 16 and 18, i haven't tried
> others.
> i take no responsibility for harm to your calculator.
>
> any feedback is welcome at msimmons@lan.tjhsst.edu with subject:TI-82 bug.
> have fun
>
> --
> gts@cais.cais.com
I've done various checking, and the third digit as 6 gives many varying
results for vaules of A-(theta), 0-9, and other simple entries. I'm
attaching a picture file (composed of multiple screenshots) that I got
from my 82 when it went wacko and changed a program listing. I have ROM
v. 18.0, and this 'stuff' doesn't seem to work on 19.0.
-Calcbert
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