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From: cy5@cunixa.cc.columbia.edu (Conway Yee)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: How to hook up turbo switch?
Keywords: turbo 386 clone ami c&t
Message-ID: <1990Aug10.200504.20168@cunixf.cc.columbia.edu>
Date: 10 Aug 90 20:05:04 GMT
References: <2050@sud509.ed.ray.com>
Sender: news@cunixf.cc.columbia.edu (The Daily News)
Reply-To: cy5@cunixa.cc.columbia.edu (Conway Yee)
Organization: Columbia University
Lines: 30

In article <2050@sud509.ed.ray.com> heiser@tdw201.ed.ray.com writes:
>
>
>Hi,
>
>I have a question about configuring the machine I am building.
>
>On the case I got, there is a "turbo" button with a two-wire cable
>attahced, with a jumper on the end (with two holes).
>
>On my motherboard, the "turbo" speed selection is made by setting a
>jumper on a 3-pin jumper.  The instructions say that for low speed,
>jumper pins 1/2, for high-speed, jumper pins 2/3.  
>
>What's the proper way for me to deal with this so that if I have the
>turbo pushbutton in the "out" position the system will be in slow speed,
>and if I have it in the "in" position, the system will run at the 
>high speed?

In your case, either pins 1 or 3 is not hooked up to anything. Thus, if
3 is the one that is hooked up to nothing then having the jumper on 2/3
is the same has an open circuit on 1/2.  Thus, installing your switch
on 1/2 enables you to toggle 1/2 open circuit or closed circuit.  This
enables you to get the "turbo" and the "standard" speeds.

If pin 1 is the one hooked up to nothing, then the reverse is true.  Placing
the switch on 2/3 allows you to toggle speeds.

			Good luck,
			Conway Yee, N2JWQ