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From: bsrdp@warwick.ac.uk (Hylton Boothroyd)
Newsgroups: comp.os.msdos.programmer
Subject: Re: rebooting by a command, not by Ctrl-Alt-del or power off/on
Summary: General method is not general to clones
Keywords: Reboot, clones
Message-ID: <1991Jan24.183619.11120@warwick.ac.uk>
Date: 24 Jan 91 18:36:19 GMT
References: <1991Jan10.013850.3506@cubmol.bio.columbia.edu> <1991Jan18.234616.18063@ncsuvx.ncsu.edu> <12503@ccicpg.UUCP>
Sender: news@warwick.ac.uk (Network news)
Organization: Warwick Business School
Lines: 33

In article <12503@ccicpg.UUCP> mhr@ccicpg.UUCP (MHR {who?}) writes:
> > > I want to know how to reboot an IBM pc not by Ctrl-Alt-del, power
> > > off/on, or pressing the reset button methods. In other words, is
> > > there a command I can issue to reboot the machine
> > > -ping   ping@cubmol.bio.columbia.edu (128.59.128.3)
> >
> > bank@lea.csc.ncsu.edu
>
> Here is the assembly language code for both warm and cold boot
> simulators.
>
> warm boot:
> 	MOV	AX,0040
> 	MOV	DS,AX
> 	MOV	AX,1234
> 	MOV	[0072],AX
> 	JMP	FFFF:0000
>
> cold boot:
> 	JMP	FFFF:0000

Note that this advice depends on having:
        * a true blue IBM PC,
	* a clone in which the manufacturer's implementatation of BIOS
	  code has emulated the true blue behaviour at FFFF:0000 .
There appears to have been a period when some manufacturers felt it
wiser not to emulate IBM warm boot too closely for fear of copyright
action. The clone I use falls into that category.
--
Hylton Boothroyd        Janet: h.boothroyd@uk.ac.warwick.cu
Warwick Business School Darpa: h.boothroyd%cu.warwick.ac.uk@relay-nsfnet.ac.uk
University of Warwick   Uucp:  h.boothroyd@warwick.uucp
COVENTRY, England       Earn/Bitnet: h.boothroyd%uk.ac.warwick.cu@UKACRL