68k virus

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Summary:

I wrote a virus for the 68k series

68k virus

gamerfreak666 11 Apr 2008 15:31

And they said it was impossible

CODE:

:Vir()
:prgm
:try
:loop
:inputstr "INPUT",a
:endloop
:else
:Vir()
:endtry
:endprgm

END

so if you can break it let me know
i only know of one way to do it and no it does not involve taking out the batteries

sooooo… DISCUSS

Re: 68k virus

DarkerLine 11 Apr 2008 18:11

Well one way to break it would be to keep causing an error (e.g. pressing ON) until either memory runs out or the recursion depth limit is reached, at which point the line vir() will cause an error and the program will exit.

This could be avoided by using Lbl and Goto instead of calling the program again.

Re: 68k virus

Socks 11 Apr 2008 21:56

Hmm, it's a good thing I didn't do that to my calculator - I don't have the patience to press ON until an overflow occurred, nor do I have the ability to build a robot to do it right now.

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/Socks

Re: 68k virus

DarkerLine 12 Apr 2008 02:33

A way to speed up the process would be to enter a very large string (which can be done fairly quickly using copy and paste) filling up most of memory.

Re: 68k virus

Socks 12 Apr 2008 13:29

How do you make a selection to copy? I know you can copy from the home screen, but can you select your own stuff (like in a program)?

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/Socks

Re: 68k virus

DarkerLine 12 Apr 2008 15:41

You can copy in much the same way as on a computer: press and hold the ⇧ key, and use the arrows to select text.

Re: 68k virus

Socks 12 Apr 2008 15:51

Oh, that makes sense. Thanks!

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/Socks

Re: 68k virus

gamerfreak666 18 Apr 2008 15:20

pressing ON will not break it :) nor will battery removal as stated above

Re: 68k virus

gamerfreak666 18 Apr 2008 15:24

there is a much eaisier way to break it without breaking your hand if you figure it out please let me know and your cookie will be mailed promptly :)

Re: 68k virus

gamerfreak666 18 Apr 2008 15:26

thank you for the goto idea i suppose i could have thought of it but i am a lazy B*D so thank you :)

Re: 68k virus

Xphoenix 13 Apr 2008 20:20

Or use the Exec command to reset the RAM. It's faster and smaller.

Here's one that eats up memory (if you run it long enough…BOOM):

virus()
Prgm
Loop
Try
Exec "12"
Else
EndTry
EndLoop
EngPrgm

As for breaking out of that (the original post), keep pushing ON. Something happens eventually.

Last edited on 16 Apr 2008 00:40 by Xphoenix Show more

Re: 68k virus

DarkerLine 13 Apr 2008 21:02

I can't say I'm happy with this genre of discussion…

Re: 68k virus

gamerfreak666 18 Apr 2008 15:23

i never said you had to come here just a topic on TI-BASIC theory discussion (albeit malicious)

Re: 68k virus

gamerfreak666 18 Apr 2008 15:22

i wrote one very similar to that a while ago but after about 5 or 6 minutes it just stops and normal processes resume

Re: 68k virus

gamerfreak666 18 Apr 2008 15:28

here is a hint on breaking it:

"Simultanious actions suck"

Re: 68k virus

brook251 01 Oct 2008 00:20

Erm, right, left, second, on breaks the program but resets your ram…