From: Nate Eldredge <neldredge AT hmc DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Rebooting the PC
Date: 26 Sep 2000 10:44:34 -0700
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To: djgpp AT delorie DOT com
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Kalum Somaratna aka Grendel <kalum AT lintux DOT cx> writes:

> On  26 Sep 2000, Prashant TR decided to enlighten us with,
> 
> > I wrote:
> > 
> > > You can try this one:
> > > 
> > > outportb (0x61, 0xfe);
> > > 
> > > It resets the CPU.
> > 
> > Sorry, there's yet another correction here apart from what Nate has
> > said. The port number is 0x64h, not 0x61h. Sorry again.
> 
> Shouldn't protected mode OS's like windoze trap this and prevent a CPU
> reset hapenning???

Of course they should.  But this would also break all the DOS programs
that tweak the hardware at low levels, so they don't.

Linux does forbid this manner of tomfoolery (except for root, and even
then it takes special measures).

-- 

Nate Eldredge
neldredge AT hmc DOT edu