Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!umich!sharkey!indetech!pacbell!barn!everexn!mike
From: mike@everexn.uucp (Mike Higgins)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Using Int 19h?
Keywords: warm boot cold boot
Message-ID: <1990Jul11.193312.13926@everexn.uucp>
Date: 11 Jul 90 19:33:12 GMT
References: <90184.155514J0S@psuvm.psu.edu> <1990Jul5.151534.3823@sj.ate.slb.co <2697a1f3-20d1.4comp.sys.ibm.pc-1@vpnet.chi.il.us>
Organization: Everex Systems, Inc.
Lines: 19

In <2697a1f3-20d1.4comp.sys.ibm.pc-1@vpnet.chi.il.us> cgordon@vpnet.chi.il.us (Gordon Hlavenka) writes:

>The jump to the 8086 boot address is usually effective, just set the flag at
>0000:0472 to 0 for cold and 1234H for warm boots.

>Anybody else?

	I wrote myself a re-boot.com progam based on the 40:72 warm start
flag, and have used it and loved it for years.  But recently it stopped
working! (When I switched to a new computer).
       It seems that the AMI BIOS in my Everex Step/20 doesn't keep the
warm start flag in that location any more...  Does anybody know of another
way to do a warm start?  Is there a command to send to the keyboard controller
to ask it to do a warm start?  Is there a flag in the CMOS clock non-volitile
RAM that indicates warm start?  (How is the 286 luke-warm reboot done when
getting out of protected mode?).  
	Does anybody else have experience with the 40:72 1234 flag failing
to work?  Is this a 'feature' of the AMI BIOS only, or do other systems
have this problem?