What I've also seen done is like what you see on Memory Simms quite a 
     bit, which are called "Presence-detect pads" which are just SMT pads 
     that are real close together and then printed with solder paste and 
     bridged together during reflow when they're needed to configure the 
     memory density that is loaded on the SIMM. The only drawback with that 
     is that you'll have to have a separate stencil for each possible board 
     configuration. A way around that though is just to use Zero-ohm SMD 
     resistors and then all you have to do is change the pick and place 
     program to build a different configuration..and you're not taking up 
     much space at all especially if you use 0603's!
     
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  > Along the same lines as Jerry Cupples' inquiry about alternatives to    
  > jumper/shunt setups for configuring boards:
     
  > Does anyone know of an easy way to do it without using thru-hole      
  > components, and something that a customer could manipulate as well?   
  > Like a surface mount jumper I guess. Does anyone manufacture them, and 
  > have any of you used them?
     
  > One possible answer to your problem, Jerry, might be to cut the       
  > headers once the test procedure is complete. We do that on some of our 
  > boards: use a header to program a part and then clip the pins so that 
  > they don't violate a height spec we design to. Of course our          
  > production is rather limited, and hand-cutting the pins is not a huge 
  > deal...
     
  > Andy B
  > [log in to unmask]

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