14 Aug
2006
14 Aug
'06
3:12 p.m.
On 8/14/06, vrs <vrs at msn.com> wrote:
So the backplane (which also wants to be physically
large) ends up being a
really expensive (and nearly impossible to fix) PCB. Might be better to use
wire-wrap (or maybe space the connectors way apart and try for 2 layers) for
the prototype :-).
How about what DEC did for later backplanes... 2-layer board plus
wire-wrap? You could do the easy stuff, power connections, etc., in
copper, then do some of the congestion relieving stuff in the
wire-wrap layer. That many wire-wrap sockets (of whatever style)
wouldn't be cheap, so I doubt it would save much money over a 4-layer
backplane, but you'd make part of the backplane circuit accessible.
-ethan