Path: utzoo!attcan!uunet!husc6!spdcc!ima!johnl
From: johnl@ima.ima.isc.com (John R. Levine)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Reset Switch
Message-ID: <3965@ima.ima.isc.com>
Date: 24 May 89 14:13:38 GMT
References: <1966@ur-cc.UUCP> <18@consult.UUCP> <5208@tekgvs.LABS.TEK.COM>
Reply-To: johnl@ima.UUCP (John R. Levine)
Organization: Segue Software, Inc.
Lines: 23

In article <5208@tekgvs.LABS.TEK.COM> keithe@tekgvs.LABS.TEK.COM (Keith Ericson) writes:
>I have an original 6mhz IBM PC AT (Model 5170) and I would like
>to wire up a reset switch ...

Here is a copy of an article I posted a year ago on this topic.  You need
some minor ability to deal with hardware, but do not need to make any
changes to the AT.  You could drill a hole in the AT's case and mount the
reset switch, but I chose to put mine in a separate little box with a cable
running into the AT, so I could remove it if need be.

I built one for about five bucks.  The AT has a "power good" signal
coming out of the power supply; if you pull that signal down to ground
for a moment the AT will think that it's just been turned on and reboot.
I put a momentary contact switch in series with a 220 ohm resistor (I picked
220 just because I had one lying around and didn't want to short the +5
directly to ground.)  Power good is pin 1 on the PS8 power connector and
a convenient ground is pin 6 on the same connector.  I just folded over the
leads from my switch and stuffed them into the back of PS8 to avoid any
cutting or soldering.  Works great.
-- 
John R. Levine, Segue Software, POB 349, Cambridge MA 02238, +1 617 492 3869
{ bbn | spdcc | decvax | harvard | yale }!ima!johnl, Levine@YALE.something
Massachusetts has 64 licensed drivers who are over 100 years old.  -The Globe