Sigh, shouldn't try to type when I'm this tired. Female 9-pin (to plug into
the BA11-D) to male 15-pin (for the DD11-C/D to plug into).
*nod* I'll put the system aside again for awhile. But if I come across a
DD11-C or D I'll go back to work on it.
In the "Go to Unibus hell" category I DO hav
> an adapter cable to go from a 9-pin male (shell; female pins) to a
> 15-pin female (shell; male pins)
Sigh, shouldn't try to type when I'm this tired. Female 9-pin (to plug into
the BA11-D) to male 15-pin (for the DD11-C/D to plug into).
Noel
> From: Chris Zach
> the DD11-B is a MUD backplane
No, it's SPC; other sources, e.g.
http://www.chdickman.com/pdp11/Notes/DD11.shtml
agree.
So if you have a DD11-B, you must have a BA11-D, with the 9-pin power
plugs.
The best thing to do is get a DD11-C or -D, and build an adapter c
On 1/9/22 4:04 PM, Chris Zach via cctalk wrote:
I'm working on my pdp11/10 getting it back together. One
problem I think I have is that the secondary memory (a
Plessy 700101-100) may be shorting the -15 line for some
reason. Working on it, but does anyone have a manual or
anything like that fo
Hm. So the DD11-B backplane does not appear to be SPC/MUD. Instead it
seems to handle 4 SPC devices along with a DF11 "communication line
adapter" in the middle AB slots.
Oi.
That brings up an interesting question: How did this system ever work in
the first place? I know I ran it with two of
If you have a 10-1/2" box, you can mount a MUD backplane - but you might
still have an issue because the older BA11-D boxes use the old 9-pin power
connectors, and the MUD backplanes (DD11-C, -D, etc) all use the newer 15-pin
ones.
There we go. I have an 11/05 in a BA11-D box with a DD11-B expan
> From: Chris Zach
> the secondary memory (a Plessy 700101-100) may be shorting the -15 line
> for some reason. Working on it, but does anyone have a manual or
> anything like that for this kind of memory board?
I've got a Plessey core memory manual somewhere, but I can't find it,
Worst case I guess I could put a broken MS11-PL board in and set it for
16k start. It's got bad memory chips on it but I think the first 16k
were good. And as a bonus it can work in both a +15 *AND* a +12 volt
Unibus (yeah, the 11/24 used +12 on the +15 lines. No idea what was
wrong with DEC)
I'm sorry, on the memories, I went to look at my old notebook form that
era, but it seems some pages have fallen out over time :-)
I think a friend has an 11/05 or 10, I will ask him for its
configuration and see if that will help.
cheers,
Nigel
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ
Probably. It's a 1973 version, the DD11-B is a MUD backplane, but it
seems to only have power plugs for +5,+15,-15. Looking at the MUD specs
I see there are backplane pins assigned for +20 and -5 so I might be
able to cobble something together.
That's one of the fun things about Unibus: There
I would assume that your 11/10 has the suffix -NC. There were two
versions, the -NC used -15V four wire memory, and the later -SC used
+20V three-wire memory.
The +20V was provided by a MUD slot (Modified Unibus Device) and there
was usually a big red sticker in it warning to not plug a modul
I'm working on my pdp11/10 getting it back together. One problem I think
I have is that the secondary memory (a Plessy 700101-100) may be
shorting the -15 line for some reason. Working on it, but does anyone
have a manual or anything like that for this kind of memory board?
Alternately, what k
On Sun, Jan 9, 2022 at 2:56 AM Noel Chiappa via cctalk <
cctalk@classiccmp.org> wrote:
> > This:
> > https://www.ebay.com/itm/275084268137
> > ...
> > Anyway I fully expect it to go ... for a _lot_ more than the opening
> price.
>
> Much to my surprise, it didn't sell at all (a
On 1/9/22 8:17 AM, P Gebhardt via cctalk wrote:
I'm rather puzzled that an -11/70 will sell for north of $10K, while a /780
can't fetch $5K. I can only guess that PDP-11'S are seen as more important in
the collector world (even though the BSD work, which had such a huge impact on
UNIX, which has
> From: Tom Hunter
> The original "Portable C Compiler" by S. C. Johnson (also known as
> "pcc") had functional support for the Data General Nova. Could somebody
> please point me to this original implementation?
> ...
> I am looking for the original implementation - not an
> On 01/09/2022 9:10 AM Tom Hunter via cctalk wrote:
>
>
> The original "Portable C Compiler" by S. C. Johnson (also known as "pcc")
> had functional support for the Data General Nova. Could somebody please
> point me to this original implementation?
>
> There is a modern C99 version of this
The original "Portable C Compiler" by S. C. Johnson (also known as "pcc")
had functional support for the Data General Nova. Could somebody please
point me to this original implementation?
There is a modern C99 version of this compiler maintained by Anders
Magnusson at: http://pcc.ludd.ltu.se/
Unf
>I'm rather puzzled that an -11/70 will sell for north of $10K, while a /780
>can't fetch $5K. I can only guess that PDP-11'S are seen as more important in
>the collector world (even though the BSD work, which had such a huge impact on
>UNIX, which has now - in the form of Linux - taken over the wo
> This:
> https://www.ebay.com/itm/275084268137
> ...
> Anyway I fully expect it to go ... for a _lot_ more than the opening
price.
Much to my surprise, it didn't sell at all (although a number of other lots,
likely from this machine, did.)
I'm rather puzzled that an -11/70 w
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