Motherboard (Was: The Burroughs B5900 and E-Mode

Josh Dersch derschjo at
Thu Oct 15 12:57:05 CDT 2015

On Thu, Oct 15, 2015 at 10:38 AM, tony duell <ard at>

> > "Motherboard" was around then, although Burroughs might not have used it.
> > Burroughs might very well have been more inclined to call it "backplane".
> I generally use the term 'motherboard' for the sort of thing you find in an
> IBM5150 or Apple ][ -- that is a board with a lot of electronics on it and
> the
> edge connectors for daughterboards (I/O cards, etc) whereas I use the term
> 'backplane' for what I have in a PDP11 or PERQ, etc, just connectors wired
> together
> (maybe with some simple logic) and almost everything on plug-in boards.
> Incidentally, the HP150 has the procrssor and video boards, along with 2
> optional
> I/O boards going in from the rear of the case and plugging into a PCB of
> connectors
> (and IIRC a simple printer interface). Due to its position HP call it the
> 'frontplane'. I have
> never seen that term used anywhere else (I assume it's also applicable to
> the HP120
> but I have never seen any technical info for that machine).

The documentation for the AMT DAP 600 I have refers to a "midplane," so
named because it's in the center of the machine, with boards plugged into
both sides...

- Josh

> -tony

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