Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!bionet!hayes.ims.alaska.edu!acad3.fai.alaska.edu!ftpam1
From: ftpam1@acad3.fai.alaska.edu (MUNTS PHILLIP A)
Newsgroups: sci.electronics
Subject: Re: PC board jumper ideas?
Message-ID: <1990Dec1.073320.4342@hayes.ims.alaska.edu>
Date: 1 Dec 90 07:33:20 GMT
References: <1990Nov30.032401.27217@cascade.Stanford.EDU>
Sender: usenet@hayes.ims.alaska.edu (J Random USENET)
Reply-To: ftpam1@acad3.fai.alaska.edu
Organization: University of Alaska Fairbanks
Lines: 37
News-Software: VAX/VMS VNEWS 1.3-4
Nntp-Posting-Host: acad3.fai.alaska.edu

In article <1990Nov30.032401.27217@cascade.Stanford.EDU>, simoni@strat.Stanford.EDU (Richard Simoni) writes...
> 
>I am building an expansion daughter board for a computer, and I need access
>to some of the signals on the existing motherboard.  All of the signals I
>need are found on the pins of standard DIP chips on the motherboard.  No
>fancy surface mounting, just DIPs soldered into a 4-layer board.  Now...
>does anyone have any good ideas on how to connect a jumper wire off of those
>pins?  Ideally, the mechanism contacting the pins should be soldered in
>place, while still allowing the wire itself to be removed, as in a
>plug/socket arrangement.  My own ideas are:
> 
>1.  Place an IC socket on top of the chip with the desired signal(s), with the
>socket pins resting on the upper "bend" of the motherboard chip's pins.
>Then use a DIP jumper to get the signal(s) to the daughter board.
> 
>2.  Solder some sort of header onto the desired pins.  A wire with the
>appropriate connector for said header then carries the signal(s) to the
>daugther board.  (Is there a type of header made for specifically this
>purpose?)
> 
>Any and all ideas appreciated,
> 
>Rich Simoni
>simoni@strat.stanford.edu

     For testing at least, you might consider DIP clips.  If you get the
kind without pinheads, you can plug a single row insulation displacement
connector and ribbon cable onto each side of the clip.

     Once upon a time many eons ago I helped install a card into a Commodore
PET that included an "EZ hook" type connector to acquire a signal.  If you
have only a few signals you might consider this also.  Not recommended for
a 32-bit bus!

Philip Munts N7AHL
NRA Extremist, etc.
University of Alaska, Fairbanks


Brought to you by Super Global Mega Corp .com