For sale 128K Core RAM Industrial PDP 11/40 Massbus System

Pete Turnbull pete at
Mon Oct 31 05:53:42 CDT 2016

On 30/10/2016 22:47, Christian Gauger-Cosgrove wrote:
> On 30 October 2016 at 18:09, Mike Ross <tmfdmike at> wrote:
>> Unix? Probably a complete brain fart by me - but I thought Unix
>> required a machine with separate I/D spaces and the 11/40 wasn't one
>> of them?
> V5 and V6 will run on an 11/40. I *think* but I might be wrong, that
> V5 doesn't support split I/D.

Dunno, but I have V7 running on an 11/23 which I demo'd at the 2015 DEC 
Legacy event.  I've also had it running on an 11/34; neither of those 
have split I&D.  I've never tried to rebuild it for my 11/40 but I know 
it's supported.

I have BSD 2.11 running on an 11/83 - that (and 2.10) does need split 
I&D - but as Lyle mentioned, 2.9 and earlier don't need it.

Pete Turnbull

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