Re: Re: A89: Archive Utility v2.00
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Re: Re: A89: Archive Utility v2.00
Perhaps an interupt or something (I don't know asm) could be setup to
intercept calls to the function, sorta like how the OS's have crashgaurd.
>I know, perhaps someone could write a module into the TI OS that is
>essentially a virus scan? I wouldn't think it would be terribly hard,
>just make it so if something tries to write on the certain areas of
>concern, you would have to okay it.
>
>Mark E. Scott Jr.
>mscott@dbcity.net
>
>
>-----Original Message-----
>From: Dux Gregis [mailto:dux@acz.org]
>Sent: Sunday, June 06, 1999 12:57 AM
>To: assembly-89@lists.ticalc.org
>Subject: Re: Re: A89: Archive Utility v2.00
>
>
>
>That's not what I know. Apparently once the flash ROM protection is
>disabled and the user has control, all memory (including the upgrade
>link area, being the same ROM as the rest of flash mem) is subject to
>editing. And yes, any program (including a normal asm program) can
>damage your calculator beyond repair. But don't panic -- ah, what the
>hell, why not panic?
>
>A simple solution: only run programs that have been priorly tested (I
>believe vti emulates the bug), say programs from ticalc.org. And if
>you know the address used in the hack, don't flaunt it recklessly.
>
>
>>
>> Olle, we need that stuff by your friend again. . .
>>
>> The way that the Flash ROM is constructed, it's impossible to
>completely
>> screw up the calculator. The Flash ROM can ONLY be written to by
>either A)
>> someplace else in the Flash ROM, B) the Flash ROM upgrade routines,
>and C)
>> that bug Dux mentioned (I'd like to know more about it). It
>*cannot*
>> normally be overwritten by programs in the RAM or User Data Archive.
>And
>> even though the bug allows them to get around that, the Flash ROM
>update
>> routines are true ROM, which cannot be overwritten (period) -
>meaning that
>> should your Flash ROM be corrupted, you can always link up to a
>computer and
>> send the ROM again.
>>
>> > This also adds the possibility f Virus's. Yu know as soon
>omeonestupid
>> > omes along and see's this they e going to try to ake a virus to
>kill
>> > youralc for good. If the Rom's corruptd then takng outthe
>batteres
>> > wouldn't even stop it. Does the ROM have to have built in ways of
>> > recieving new product code? If so we ned a way of protecting our
>> > individual ROM. Any ideas or suggestions? I not trying to star a
>> > panick and if I'm wrong please corret me.
>> >
>> > c2b3
>>
>>
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