Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!inesc!ajr
From: ajr@inesc.UUCP (Julio Raposo)
Newsgroups: comp.sys.ibm.pc
Subject: warm/cold reboot on a IBM-PC
Keywords: reboot, IBM-PC
Message-ID: <203@inesc.UUCP>
Date: 17 Jan 90 09:57:27 GMT
Organization: INESC - Inst. Eng. Sistemas e Computadores, LISBOA. PORTUGAL.
Lines: 23


	I hope this can help some of you out there.

	After the recent postings about cold and warm reboot by jumping
	to adress FFFF:0000, I decided to find out why it always did a cold
	reboot on my computer, although pressing the Ctrl-Alt-Del keys gave
	a warm reboot. I found out that the value I have to load into adress
	0000:0472 (I'm writing it from memory, don't torch me if it is the
	wrong adress, please look in the previous postings) is NOT 1234, or,
	in C programs, ~0x1234. My ROM Bios has a NOT instruction to that
	memory adress before the test, thats why the warm boot didn't work.
	Changing the value from 1234 to NOT 1234 (don't be confused) gave me
	the warm boot I was looking for.

						Antonio Julio Raposo

					  (ajr@inesc.pt - LISBOA - PORTUGAL)


P.S.: My BIOS is Schneider (German made) for MS-DOS 3.3

Disclaimer: My boss knows nothing about this, I hope he never finds out.
	    All standart disclaimers apply.