RE: [OFFTOPIC] BIOS Password defeat
On 08-Aug-2000 Daniel Reuter wrote:
> Hello there,
>
> I found a pretty nice 486 PCI-motherboard in the bulk waste last week,
> which I would like to use as secondary computer with debian. The board is
> working, but unfortunately, it was setup in a way that you can only boot
> from harddisk, and shadow RAM was enabled. So I tried to change the
> settings, but the preliminary user has installed a Setup-Password, so that
> I can't access the BIOS. I know, that there are ways to get around this,
> but I don't know how to do it in this special case.
> So does anybody know where to find the necessary information? Is there a
> tool for Linux or DOS to access and change BIOS-settings (I could plugin
> the harddisk from another computer and try to boot into Linux or use the
> small DOS-partition I have on this disk). Or is there some kind of cheat
> password, which will always work?
> The BIOS is a Phoenix version 4.04.
You could write a little program or use dos debug to wipe out the cmos data
at port 0x70 index, 0x71 data. (Containing something like:
for (i=0; i<0x80; i++) {
outp(0x70, i); outp(0x71, 0);
} )
In fact, it's only necessary to alter the checksum, and the bios should reset
to the defaults.
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