> From: Tony Duell
> if it behaves as you describe, it would appear that if placed at the
> remote end of the bus it could lock the bus by forcing SACK/ asserted
> (as the M9302 does) if a grant chain is open [and there's a board with
> a pull-up on the grant input just after t
>
> > Converting between genuine 20mA loop and RS232 is not that hard.
>
> Yes, but I'm i) lazy, and ii) overwhelmed with other projects! :-)
True, but sometimes (and I have been guilty of this) it takes longer to post
and moan
about the problem than to dig into the junk box, grab the solde
> From: Tony Duell
> Converting between genuine 20mA loop and RS232 is not that hard.
Yes, but I'm i) lazy, and ii) overwhelmed with other projects! :-)
>> there's a 'SACK Timeout Module' (M8264) which I think performs the
>> same function, but at the _start_ of the bus. (I say
>
> > Yes, it is a pity that the later board set (a) has the jumper to
> > disable the built-in console port and (b) has the switchable divider
> > allowing higher baud rates so you generally don't need to :-)
>
> Well, except for those of us who don't have any 20mA gear, and want to
> From: Tony Duell
> Yes, it is a pity that the later board set (a) has the jumper to
> disable the built-in console port and (b) has the switchable divider
> allowing higher baud rates so you generally don't need to :-)
Well, except for those of us who don't have any 20mA gear, a
My 11/05 S's have the names of the cards printed on the chassis wall. The
cards and their slots are listed in the 11/05 S docs. I have always
referred to these unambiguous sources. As long as you have the matching
mounting box for the version of model S of course.
Bill Degnan
twitter: billdeg
v
On 10/5/2015 10:24 AM, Henk Gooijen wrote:
=
Sorry for the delayed answer, I don't
have email available at work -:/
I have one M930 in slot 3 position
A-B, because that is the termination
for the processor. I am pretty sure
(not 100%) that I also have an M930
in slot 9 position A-
good news as far as power supply goes.
On Mon, Oct 5, 2015 at 4:02 PM, Henk Gooijen
wrote:
> -Oorspronkelijk bericht- From: william degnan Sent: Monday,
> October 05, 2015 8:59 PM To: General Discussion: On-Topic and Off-Topic
> Posts Subject: Re: PDP-11/10 repair started
>
-Oorspronkelijk bericht-
From: william degnan
Sent: Monday, October 05, 2015 8:59 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: PDP-11/10 repair started
What are the DC LO and AC LO values off the backplane? Do they change when
you insert the CPU card. (one
Sent: Monday,
>> October 05, 2015 5:44 PM To: cctalk@classiccmp.org Subject: Re:
>> PDP-11/10 repair started
>> Ok. I got the initial impression that you only had the CPU in. Thanks
>> for the expanded info.
>>
>> When you don't have any core memory, I wonder i
On 2015-10-05 17:56, Henk Gooijen wrote:
-Oorspronkelijk bericht- From: Johnny Billquist Sent: Monday,
October 05, 2015 5:44 PM To: cctalk@classiccmp.org Subject: Re:
PDP-11/10 repair started
Ok. I got the initial impression that you only had the CPU in. Thanks
for the expanded info
-Oorspronkelijk bericht-
From: Johnny Billquist
Sent: Monday, October 05, 2015 5:44 PM
To: cctalk@classiccmp.org
Subject: Re: PDP-11/10 repair started
Ok. I got the initial impression that you only had the CPU in. Thanks
for the expanded info.
When you don't have any core m
>
> When you don't have any core memory, I wonder if you might need bus
> grants in those slots as well...? It's not as if they aren't a part of
> the Unibus... Memory sits on the Unibus, just like everything else,
> remember? Needs to check further if any special wiring are in place for
> those s
On 2015-10-05 17:24, Henk Gooijen wrote:
-Oorspronkelijk bericht- From: Johnny Billquist
Sent: Monday, October 05, 2015 4:53 PM
To: cctalk@classiccmp.org
Subject: Re: PDP-11/10 repair started
On 2015-10-05 13:50, tony duell wrote:
The 11/10 generally uses an M930 terminator.
Right
-Oorspronkelijk bericht-
From: Johnny Billquist
Sent: Monday, October 05, 2015 4:53 PM
To: cctalk@classiccmp.org
Subject: Re: PDP-11/10 repair started
On 2015-10-05 13:50, tony duell wrote:
The 11/10 generally uses an M930 terminator.
Right. However, the SACK signal exists, even on
On 2015-10-05 13:50, tony duell wrote:
The specific issue of an open grant chain locking the Unibus is a quirk
of the M9302 terminator (which asserts SACK under such conditions). This
is unlikely to be a problem on an 11/10.
Why? The 11/10 also have a Unibus, and also needs the terminator as we
>> isn't the switchable divider only present on later boards (the early
> > ones being pretty much 110 baud only)?
>
> Ooh, right you are - another way to tell the early M7260 from later ones. If
Yes, it is a pity that the later board set (a) has the jumper to disable the
built-in
consol
>> From: Tony Duell
>> I am working from 2 Printsets, both from Bitsavers. One is the GT40 one
>> (yet another backplane of course, but the same CPU, core memory, etc).
> Ah, thanks for that pointer; I'll see if it shows the same board
> versions as my 'early' hardcopy set.
> > The specific issue of an open grant chain locking the Unibus is a quirk
> > of the M9302 terminator (which asserts SACK under such conditions). This
> > is unlikely to be a problem on an 11/10.
>
> Why? The 11/10 also have a Unibus, and also needs the terminator as well
> as the SACK and other
On 2015-10-05 07:26, tony duell wrote:
You have no memory, and probably no devices to complete the
Unibus. So, it is quite likely showing the Unibus is in a
jammed state. At the least, you need a Unibus terminator,
and any bus grant cards between the CPU and the terminator
(you'd have to check
>
> You have no memory, and probably no devices to complete the
> Unibus. So, it is quite likely showing the Unibus is in a
> jammed state. At the least, you need a Unibus terminator,
> and any bus grant cards between the CPU and the terminator
> (you'd have to check the manual to see how the Uni
>
> > The other is the 11/05S schematic, which shows the later boards with
> > the crystal UART clock
>
> Say what? The "11/05S schematic" from Bitsavers shows the RC clock; look on
> page 61, bottom left corner, there's an RC circuit (and a couple of flops)
> producing an output "DPH TT
On 10/04/2015 01:09 PM, Henk Gooijen wrote:
Some corrections to my post regarding the console LED
behavior.
Voltage levels on the CPU backplane are still good whne
the 2 CPU boards
are installed in the backplane, but the processor is not
responsive to
the switches on the console panel.
The
> From: Tony Duell
> I am working from 2 Printsets, both from Bitsavers. One is the GT40 one
> (yet another backplane of course, but the same CPU, core memory, etc).
Ah, thanks for that pointer; I'll see if it shows the same board versions as
my 'early' hardcopy set.
> The other
> From: Tony Duell
> There are at least 2 versions of the 11/10 CPU boards. The later one,
> which I thought was the 11/10S, has soldered wire links to disable the
> arbiter ... I think another link disables the built-in console port.
> And didn't it use a crystal rather than R
On 2015-10-04 20:09, Henk Gooijen wrote:
Some corrections to my post regarding the console LED behavior.
Voltage levels on the CPU backplane are still good whne the 2 CPU boards
are installed in the backplane, but the processor is not responsive to
the switches on the console panel.
The RUN LED
I just yesterday started working on assembling an 11/05 S with a BK11-K
backplane. At the moment I am working through the power regulators to make
sure everything is right before I install the boards. I am assembling from
parts on hand but I do have the correct cards. I have M7260/61 and 8K
Core
On 10/4/2015 3:04 PM, Henk Gooijen wrote:
=
I define 11/10"S" by the backplane. There are 4 different backplanes
for the 11/10 and 11/05, according to the doc. I have them on my website,
www.pdp-11.nl/pdp11-05/cpu/backplanes.html
I did not know that there were different versions of the
> I define 11/10"S" by the backplane. There are 4 different backplanes
> for the 11/10 and 11/05, according to the doc. I have them on my website,
> www.pdp-11.nl/pdp11-05/cpu/backplanes.html
RIght...
> I did not know that there were different versions of the CPU boards,
> except the Rev.E and R
-Oorspronkelijk bericht-
From: tony duell
Sent: Sunday, October 04, 2015 10:44 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: RE: PDP-11/10 repair started
Yes, it is an 11/10S.
How do you define '11/10S' ?
AFAIK, the M7260 and M7261 is used in all 11/1
>
> Yes, it is an 11/10S.
How do you define '11/10S' ?
> AFAIK, the M7260 and M7261 is used in all 11/10 versions, and
> of course all 11/05 versions. I could be wronge though ...
The 11/05 and 11/10 are, by now, the same machine ;-). What I mean
by that is that essentially the difference was
-Oorspronkelijk bericht-
From: tony duell
Sent: Sunday, October 04, 2015 9:52 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: RE: PDP-11/10 repair started
the microcode is "on the menu" for next weekend ...
The system is a 11/10S, CPU is M7260 and M7261.
Ar
>
>
> the microcode is "on the menu" for next weekend ...
> The system is a 11/10S, CPU is M7260 and M7261.
Are you sure that's an 'S'? I thought the 'S' was the M8260/M8261 board
set with the links to disable the bus arbiter so it can be used as a slave
processor.
Anyway, getting back to this
-Oorspronkelijk bericht-
From: tony duell
Sent: Sunday, October 04, 2015 9:09 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: RE: PDP-11/10 repair started
Oops, I forgot to mention a few other checks that I did ...
AC LO and DC LO are some 4.6V. Both have a 130 mV
>
> Oops, I forgot to mention a few other checks that I did ...
> AC LO and DC LO are some 4.6V. Both have a 130 mV ripple, no spikes.
> That seems OK to me.
Sure, those sound OK to me too. But you would have felt a right idiot if you
had spent days working through the microcode and CPU logic onl
-Oorspronkelijk bericht-
From: tony duell
Sent: Sunday, October 04, 2015 8:16 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: RE: PDP-11/10 repair started
Some corrections to my post regarding the console LED behavior.
Voltage levels on the CPU backplane are still
> Some corrections to my post regarding the console LED behavior.
>
> Voltage levels on the CPU backplane are still good whne the 2 CPU boards
> are installed in the backplane, but the processor is not responsive to
> the switches on the console panel.
It's been a long time since I've been insid
Some corrections to my post regarding the console LED behavior.
Voltage levels on the CPU backplane are still good whne the 2 CPU boards
are installed in the backplane, but the processor is not responsive to
the switches on the console panel.
The RUN LED is on, ADDRESS/DATA are all off. When the
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