said:
>I don't even know what "backplane architecture" is,
>but I recall some references to backplanes long ago.
>Didn't Zenith use them in some of their early PC
>designs ? (Not multiple CPUs, though. It would have
>been a lone 8086 or perhaps 80186 . . . .) {Zenith
>had a parallel development for awhile with HeathKit,
>the kits from which you could build some early PCs.
>The Zenith version came pre-built; the Heathkit
>version you put together yourself was somewhat
>cheaper. I think the last of these may have had an
>80386 in it.}
The Heath/Zenith computers were, IIRC, based on the S-100 Buss. The S-100
buss was a good example of the passive backplane architecture. And, I seem
to recall that it was patterned (loosely) after the DEC PDP-11. I'm not sure
where the ancestery goes from there, but I'm sure that even earlier examples
can be found. The biggest problem with passive backplane is that signal
paths tend to be a bit long.
-- gary
-----------------------------------------------------------
Gary Granat
ggranat@earthlink.net
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