* [pups] pdp11/73 memory
@ 2003-12-12 17:56 Fred N. van Kempen
2003-12-12 19:29 ` emanuel stiebler
0 siblings, 1 reply; 8+ messages in thread
From: Fred N. van Kempen @ 2003-12-12 17:56 UTC (permalink / raw)
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
^ permalink raw reply [flat|nested] 8+ messages in thread
* [pups] pdp11/73 memory
2003-12-12 17:56 [pups] pdp11/73 memory Fred N. van Kempen
@ 2003-12-12 19:29 ` emanuel stiebler
2003-12-12 20:14 ` David Evans
2003-12-13 1:58 ` Johnny Billquist
0 siblings, 2 replies; 8+ messages in thread
From: emanuel stiebler @ 2003-12-12 19:29 UTC (permalink / raw)
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 ?
^ permalink raw reply [flat|nested] 8+ messages in thread
* [pups] pdp11/73 memory
2003-12-12 19:29 ` emanuel stiebler
@ 2003-12-12 20:14 ` David Evans
2003-12-13 1:58 ` Johnny Billquist
1 sibling, 0 replies; 8+ messages in thread
From: David Evans @ 2003-12-12 20:14 UTC (permalink / raw)
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
^ permalink raw reply [flat|nested] 8+ messages in thread
* [pups] pdp11/73 memory
2003-12-12 19:29 ` emanuel stiebler
2003-12-12 20:14 ` David Evans
@ 2003-12-13 1:58 ` Johnny Billquist
1 sibling, 0 replies; 8+ messages in thread
From: Johnny Billquist @ 2003-12-13 1:58 UTC (permalink / raw)
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
^ permalink raw reply [flat|nested] 8+ messages in thread
* [pups] pdp11/73 memory
2003-12-12 17:23 ` David Evans
@ 2003-12-13 1:56 ` Johnny Billquist
0 siblings, 0 replies; 8+ messages in thread
From: Johnny Billquist @ 2003-12-13 1:56 UTC (permalink / raw)
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
^ permalink raw reply [flat|nested] 8+ messages in thread
* [pups] pdp11/73 memory
@ 2003-12-12 22:49 Carl Lowenstein
0 siblings, 0 replies; 8+ messages in thread
From: Carl Lowenstein @ 2003-12-12 22:49 UTC (permalink / raw)
> 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
^ permalink raw reply [flat|nested] 8+ messages in thread
* [pups] pdp11/73 memory
2003-12-12 16:31 Christos Papachristou
@ 2003-12-12 17:23 ` David Evans
2003-12-13 1:56 ` Johnny Billquist
0 siblings, 1 reply; 8+ messages in thread
From: David Evans @ 2003-12-12 17:23 UTC (permalink / raw)
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
^ permalink raw reply [flat|nested] 8+ messages in thread
* [pups] pdp11/73 memory
@ 2003-12-12 16:31 Christos Papachristou
2003-12-12 17:23 ` David Evans
0 siblings, 1 reply; 8+ messages in thread
From: Christos Papachristou @ 2003-12-12 16:31 UTC (permalink / raw)
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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2003-12-12 17:56 [pups] pdp11/73 memory Fred N. van Kempen
2003-12-12 19:29 ` emanuel stiebler
2003-12-12 20:14 ` David Evans
2003-12-13 1:58 ` Johnny Billquist
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2003-12-12 22:49 Carl Lowenstein
2003-12-12 16:31 Christos Papachristou
2003-12-12 17:23 ` David Evans
2003-12-13 1:56 ` Johnny Billquist
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