, on 01/19/07
at 10:31 PM, ggranat@earthlink.net said:
>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.
This may be true, although it's been a while since I've seen the insides
of a PDP-11. Wikipedia might be able to reveal some of the history.
>I'm not sure where the ancestery goes from there, but I'm sure
>that even earlier examples can be found.
There were any number of them. The Intel Multibus comes to mind.
>The biggest problem with
>passive backplane is that signal paths tend to be a bit long.
True, but this can be handled with good design.
FWIW, while not quite the same, there are several examples of PCs running
multiple CPUs on separate boards. For OS/2, there was the Orange Micro.
This was a plugin that allowed an Apple to OS/2 Warp natively on an x86.
I had a plugin card for my Apple ][ that contained an 8085 that ran CP/M.
Regards,
Steven
--
----------------------------------------------------------------------
"Steven Levine" MR2/ICE 2.67 #10183 Warp/eCS/DIY/14.103a_W4
www.scoug.com irc.fyrelizard.com #scoug (Wed 7pm PST)
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