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From: ark@rabbit.UUCP
Newsgroups: net.micro.pc
Subject: reset for IBM PC
Message-ID: <2292@rabbit.UUCP>
Date: Thu, 15-Dec-83 22:36:02 EST
Article-I.D.: rabbit.2292
Posted: Thu Dec 15 22:36:02 1983
Date-Received: Sat, 17-Dec-83 02:35:19 EST
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 25

One of the pins on one of the system board power supply connectors
is noted as "Power Good".  The hardware manual has this to say:

	"Power On/Off Cycle:  When the supply is turned off
	for a minimum of 1.0 second, and then turned on, the
	power-good signal will be regenerated.

	The power-good signal indicates that there is adequate
	power to continue processing.  If the power goes below
	the specified levels, the power-good signal triggers
	a system shutdown.

	This signal is the logical AND of the dc output-voltage
	sense signal and the ac input voltage fail signal.
	This signal is TTL-compatible up-level for normal
	operation or down-level for fault conditions.
	The ac fail signal causes pwer-good to go to a down-level
	when any output voltage falls below the regulation
	limits.

	The dc output-voltage sense signal holds the power-good
	signal at a down level (during power-on) until all
	output voltages have reached their respective minimum
	sense levels.  The power-good signal has a turn-on delay
	of at least 100 ms but no greater than 500 ms."