[pups] pdp11/73 memory

[pups] pdp11/73 memory

[Christos Papachristou]

 
I recently found a cabinet with a MicroVAX II (in 2 BA23 enclosures) and
quite a lot storage devices on it. I plan to replace the MicroVAX II CPU
module (M7606-AA) with a pdp11/73 CPU module (M8192) . I only have a
512k RAM module (M8067LA) for the pdp11/73 . The microVAX has two quad
height memory modules , but I haven't checked yet whether they are 1, 2
,4 or 8 megs each (ie M7607,M7608 or M7609) .Is it possible to keep some
of the MicroVAX memory modules if they are below or equal to 4 megs?  
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[pups] pdp11/73 memory

[David Evans]

On Fri, Dec 12, 2003 at 06:31:12PM +0200, Christos Papachristou wrote:
>  
> Is it possible to keep some
> of the MicroVAX memory modules if they are below or equal to 4 megs?  


  No.  The uVAX memory requires special PMI stuff (carried over those
ribbon cables) that the PDP-11 CPUs don't grok.  At least, that's
what I've always been told.

-- 
David Evans                                         dfevans at bbcr.uwaterloo.ca
Ph.D. Candidate, Computer/Synth Junkie     http://bbcr.uwaterloo.ca/~dfevans/
University of Waterloo         "Default is the value selected by the composer
Ontario, Canada           overridden by your command." - Roland TR-707 Manual

[pups] pdp11/73 memory

[Johnny Billquist]

On Fri, 12 Dec 2003, David Evans wrote:

> On Fri, Dec 12, 2003 at 06:31:12PM +0200, Christos Papachristou wrote:
> >  
> > Is it possible to keep some
> > of the MicroVAX memory modules if they are below or equal to 4 megs?  
> 
>   No.  The uVAX memory requires special PMI stuff (carried over those
> ribbon cables) that the PDP-11 CPUs don't grok.  At least, that's
> what I've always been told.

And that's correct.

The 11/73 require Q-bus memory. The only VAX that used this is the
MicroVAX I.
If the 11/73 really is a disguised 11/83 CPU, you can use the 11/83 PMI
memory, which don't work the same way as the VAX PMI.

(PMI by the way stands for Private Memory Interconnect)

	Johnny

Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt at update.uu.se           ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

[pups] pdp11/73 memory

[Fred N. van Kempen]

Hi all,

>   No.  The uVAX memory requires special PMI stuff (carried over those
> ribbon cables) that the PDP-11 CPUs don't grok.  At least, that's
> what I've always been told.
Correct.

--f

[pups] pdp11/73 memory

[emanuel stiebler]

Fred N. van Kempen wrote:

> Hi all,
> 
> 
>>  No.  The uVAX memory requires special PMI stuff (carried over those
>>ribbon cables) that the PDP-11 CPUs don't grok.  At least, that's
>>what I've always been told.
> 
> Correct.

Really ? I thought the uVaxI had the memory on the qbus ?

[pups] pdp11/73 memory

[David Evans]

On Fri, Dec 12, 2003 at 12:29:49PM -0700, emanuel stiebler wrote:
> Fred N. van Kempen wrote:
> 
> >Hi all,
> >
> >
> >> No.  The uVAX memory requires special PMI stuff (carried over those
> >>ribbon cables) that the PDP-11 CPUs don't grok.  At least, that's
> >>what I've always been told.
> >
> >Correct.
> 
> Really ? I thought the uVaxI had the memory on the qbus ?
> 

  uVAX I does, I think, but IIRC the original post was about uVAX II
memory.

-- 
David Evans                                         dfevans at bbcr.uwaterloo.ca
Ph.D. Candidate, Computer/Synth Junkie     http://bbcr.uwaterloo.ca/~dfevans/
University of Waterloo         "Default is the value selected by the composer
Ontario, Canada           overridden by your command." - Roland TR-707 Manual

[pups] pdp11/73 memory

[Johnny Billquist]

On Fri, 12 Dec 2003, emanuel stiebler wrote:

> Fred N. van Kempen wrote:
> 
> > Hi all,
> > 
> > 
> >>  No.  The uVAX memory requires special PMI stuff (carried over those
> >>ribbon cables) that the PDP-11 CPUs don't grok.  At least, that's
> >>what I've always been told.
> > 
> > Correct.
> 
> Really ? I thought the uVaxI had the memory on the qbus ?

Correct. :-)
And so the uVAX I don't have ribbon cables to memory.

	Johnny

Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt at update.uu.se           ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

[pups] pdp11/73 memory

[Carl Lowenstein]

> From: "Christos Papachristou" <chpap at ics.forth.gr>
> To: <pups at minnie.tuhs.org>
> Date: Fri, 12 Dec 2003 18:31:12 +0200
> Subject: [pups] pdp11/73 memory
>  
> I recently found a cabinet with a MicroVAX II (in 2 BA23 enclosures) and
> quite a lot storage devices on it. I plan to replace the MicroVAX II CPU
> module (M7606-AA) with a pdp11/73 CPU module (M8192) . I only have a
> 512k RAM module (M8067LA) for the pdp11/73 . The microVAX has two quad
> height memory modules , but I haven't checked yet whether they are 1, 2
> ,4 or 8 megs each (ie M7607,M7608 or M7609) .Is it possible to keep some
> of the MicroVAX memory modules if they are below or equal to 4 megs?  

No.
MicroVAX memory uses a different interconnect scheme.
It is not in the Qbus address space.

    carl
-- 
    carl lowenstein         marine physical lab     u.c. san diego
                                                 clowenst at ucsd.edu