Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!samsung!munnari.oz.au!csource!david
From: david@csource.oz.au (david nugent)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Using Int 19h?
Message-ID: <558@csource.oz.au>
Date: 8 Jul 90 16:26:42 GMT
References: <90184.155514J0S@psuvm.psu.edu> <1990Jul3.221200.3894@kth.se> <1990Jul6.031331.13561@everexn.uucp>
Organization: Unique Computing Pty Ltd, Melb, Aust.
Lines: 52

In <1990Jul6.031331.13561@everexn.uucp> mike@everexn.uucp (Mike Higgins) writes:

>>Try this It will Reboot your system 
>>Use debug
>>
>>-n reboot.com
>>-a 100
>>mow ax,0040
>>push ax
>>pop es
>>es:
>>mov word ptr [0072], 1234
>>jmp ffff:0000
>>-rcx
>>11
>>w
>>q
>	I have used this trick sucessfully for years, but it stopped working
>when I moved up to a 386.  I've tried reboot.com on many AT's and find that
>it doesn't work on some, does on others.  Never works on my Everex Step/20.
>I'd be VERY interested in a version that does work on newer 386's.


The problem there is memory management.  In some situations it works; in
others it doesn't.  What you need to do is better simulate a reboot.

I use the following code with great success, with only two exceptions; it
doesn't work under either PC-MOS/386 or Windows 3.0.  It does work fine
with QEMM or 386^MAX, and also under DESQview.

	xor	ax,ax
	mov	es,ax
	mov	bx,1234
	mov	es:[0472],bx		<- for warm boot
	cli
	mov	ds,ax
	mov	es,ax
	mov	ss,ax
	mov	sp,ax
	mov	ax,2
	push	ax
	mov	ax,f000
	push	ax
	mov	ax,fff0
	push	ax
	iret

	
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