On 21 Aug, Michael Kukat wrote:

> I don't know exactly if the 2 backplanes differ.
The older /300 only backplanes have a 32 bit memory interconnect, the
newer /300 and up backplanes have a 64 bit memory interconnect. I have
a /300, that was upgraded to a /400 with the 5019353 / 5419354
backplane. But remember that the /400 CPU uses different memory (32 vs.
64 bit). 
-- 



tschüß,
         Jochen

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