CUBIX/6809 updates - test-drb@ccmp.vtda.org

13 Dec 2005

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Subject: RE: CUBIX/6809 updates
   From: "Robert Armstrong" <bob at jfcl.com>
   Date: Tue, 13 Dec 2005 11:38:37 -0800
     To: "'General Discussion: On-Topic and Off-Topic Posts'"	<cctalk
at classiccmp.org>

  Same problem as the S100, tho - how do you chisel
out an XT 
 board edge connector at home... 
  I've had fairly good success (the SBC6120 and Elf 2000) using stacking bus
connectors, similar to PC/104.  They aren't quite as general purpose as a
real backplane, but you don't need fingers and you don't need gold plating.

Bob 
This is a solution I've used as well that is cheap and has few negatives
if any.  One advantage is the connector is not married to any bus.

I've used multiple 20, 34 and 40wide ribbon with IDC connectors for a 
bus (alternate grounds and power) that performs well at decent speeds.
If one cable is not enough pins then use two side by side.  It's 
advantage is common, cheap and you can taylor bus width to your needs.
Since the "back plane" is short typically the problems of ringing and 
cross talk are minimal and adaquate grounds keep it clean. 

Allison