Article View: comp.sys.atari.st
Article #33367Re: How not to boot from your hard disk.
From: Ge' Weijers
Date: Tue, 26 Jul 1988 15:49
Date: Tue, 26 Jul 1988 15:49
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From article <489@laura.UUCP>, by klute%trillian.irb@unido.uucp (Rainer Klute):
> In article <1094@atari.UUCP> apratt@atari.UUCP (Allan Pratt) writes:
>>* COLD cold boot code: copy a bit of code to $8, then jump to it. *
>>* The bit of code clears RAM starting from its own end, until it *
>>* gets a bus error. Then it jumps to the start of the ROM. *
>
> Why not simply set memvalid (0x0420) to zero and jump through 0x0004?
>
A virus conceivably might restore memvalid directly after the reset (or can
it? I'd have to check it with a disassembler)
--
Ge' Weijers, Informatics dept., Nijmegen University, the Netherlands
UUCP: {uunet!,}mcvax!kunivv1!hobbit!ge
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!attcan!uunet!mcvax!kunivv1!hobbit!ge From: ge@hobbit.sci.kun.nl (Ge' Weijers) Newsgroups: comp.sys.atari.st Subject: Re: How not to boot from your hard disk. Message-ID: <301@hobbit.sci.kun.nl> Date: 26 Jul 88 15:49:37 GMT References: <489@laura.UUCP> Organization: University of Nijmegen, The Netherlands. Lines: 13