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From: fzsitvay@techbook.com (Frank Zsitvay)
Newsgroups: comp.sys.dec.micro
Subject: Re: PC100B MEMORY EXPANSION
Message-ID: <1990Dec4.014444.27145@techbook.com>
Date: 4 Dec 90 01:44:44 GMT
References: <9012021412.AA08543@remote.dccs.upenn.edu> <1990Dec02.163654.10451@mthvax.cs.miami.edu>
Distribution: na
Organization: TECHbooks of Beaverton Oregon - Public Access Unix
Lines: 38

In a previous article, the author's name unknown at this moment, someone
said:

>>While adding chips to my PC100B Memory Expansion board recently I bent
>>the tan 10 pin resister pac near the middle of the board.  
>
>>I want to replace the resister pac that I believe is faulty but I am
>>unable to find a value for it.  

   if this is a 9 pin SIP resistor, remove the remnents of the old one
from the board, and make sure you end up with 9 clean holes.  you'll 
want to install a 9 pin SIP socket (radio shack carries a sip socket, just
trim off the unneeded positions with diagonal cutters or a razor saw.
a butcher's cleaver can be used as a last resort.)  then, find a 22k
resistor pack (usually, pin one is common, and there are eight resistors
connected between it and the individual pins.) and insert it into the
socket.  
 
   the reason why you should use a socket is because, although 22k ohms
is common for this application (pull-up or pull-down resistors with
LS TTL glue) it may not be the correct value, and it would be easier to
pull out the resistor pack and insert another one than to solder one
in, and have to rip it out if it doesn't work.
 
   it is best to err on the high side of resistance.  i don't think you
could do any damage with a low resistance, but you may not want to take
that chance.  you'll know when it works, as you'll get no errors during the
memory test.
 
   digi-key carriers the stuff you need if you can't find it anywhere
else...



-- 
fzsitvay@techbook.COM - but don't quote me on that....

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