11/70 board set on e-bay. . .

[Patrick Finnegan]

On Monday 14 January 2008 22:02, Richard wrote:
> In article <478C1B0E.8090407 at shiresoft.com>,
>
>     Guy Sotomayor <ggs at shiresoft.com>  writes:
> > The 11/70 CPU is *not* a unibus backplane.  It is a *very* large
> > backplane that fills an entire BA11F.
>
> Interesting, I just assumed it was unibus.  Is the /70 the only
> PDP-11 that has a custom backplane?  I thought the PDP-11 family had
> standard backplanes: unibus and Q-bus.

No.  Every UNIBUS -11 has a custom CPU backplane to some extent.

The QBUS ones have a mostly common backplane (ignoring differences in 
how many bits are wired on the address lines) mostly because the CPU 
fits all one one board.

FWIW, UNIBUS is a bus, not a backplane type.  A DD11 is pretty much the 
only UNIBUS backplane that isn't custom to the device that's in it.

Pat
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