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From: mark@ems.UUCP (Mark H. Colburn)
Newsgroups: net.micro.pc
Subject: Re: need reset button for pc clone
Message-ID: <22@ems.UUCP>
Date: Fri, 7-Nov-86 04:37:19 EST
Article-I.D.: ems.22
Posted: Fri Nov  7 04:37:19 1986
Date-Received: Sat, 8-Nov-86 06:20:10 EST
References: <168@boulder.UUCP>
Reply-To: mark@ems.UUCP (Mark H. Colburn)
Distribution: na
Organization: EMS/McGraw-Hill, Eden Prairie
Lines: 22
Keywords: reset IBM PC

We have made several reset buttons for our pc's here at work.  On the IBM/PC,
I am not sure about others, there is a line going from the power supply to
the mother board called power good.  This line is used by the system to
monitor the quality of power that is being supplied.  This line is constantly
held high by the system.  If the power good line drops below a certain
threshold voltage then the system will shutdown.  Neat, huh?  So, what you
do is buy a momentary contact switch and connect one of the leads to the
power good line and the other lead goes to ground.  On the PC this can
be done without soldering, since the leads will fit quite nicely into
the power connector plug on the mother board along side the wires from
the power supply.  Now, when you press the switch you will pull the power
good line low, and the system will reset.  This is roughly equivilent to
a cold boot, without the POST.  Total cost is about $1.35.




-- 
Mark H. Colburn             UUCP: ihnp4!rosevax!ems!mark
EMS/McGraw-Hill              ATT: (612) 829-8200
9855 West 78th Street
Eden Prairie, MN  55344