For what's it worth ... I do not have an 11/45 :-(, but I
was triggered when I read M787. Long ago, I added "LTC" to
my 11/35, which involved installing an M787 in slot 3,
position F. The 11/35 manual said that you must cut one
wire on the backplane ... perhaps that applies here too ...?
- Henk.
> -----Original Message-----
> From: cctalk-bounces at classiccmp.org
> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Jay West
> Sent: dinsdag 28 maart 2006 7:32
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: 11/45 RTC
>
> Given that the system seems to pass a lot of diags, but fails
> the LTC test, I'm focusing there. From looking in the
> programming manual for the DL11-W, it appears that bit 7
> never being set means that there is no LTC L signal coming in
> to the DL11-W. It would appear that software clears this bit
> and then waits for it to set (by the square wave from the AC
> at 50 or 60 hz or so). According to the diag, bit 7 never
> sets, so I'm thinking I'm not getting any LTC signal from the
> power supply. I need to find that square wave signal and see
> if it's working and directed to the right place.
>
> My problem is finding that signal. My 11/45 is a KB11-A,
> serial number < 2000. The maintenance manual shows the LTC
> coming from the power supply to the power distribution board
> (top connector towards the cabinet door) shows six wires, the
> bottom one (brown) going to slot 1 row C where the M787
> option plugs in. My top connector does not have that many
> wires, only 3 or so. My system never had (I don't believe) a
> M787 card. The system came with two DL11-A (M7800), and a
> M7228 (KW11-P). But I don't think there was ever a LTC in
> slot 1. So is it possible that LTC isn't even routed out of
> the power supply? I'm wanting to use a single DL11-W with the
> onboard LTC. But doesn't that need to get the LTC signal from
> the backplane? If it wasn't ever routed to the system unit....
>
> So I'm not sure where to look. I'll pour over the manuals some more.
>
> Jay West
>
>
>
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As I stated in the chat last night, I don't know a whole lot about 11/45s
(or rather, any PDP11s before the /04 in general) but I would recommend
downloading xxdp v2.5 and seeing if that even boots. This is an easy way to
figure out if (a) it's just RT-11 5.1, and (b) if there are additional diags
on the xxdp 2.5 cartridge that might help nail down the problem.
Downloadable here:
http://www.ibiblio.org/pub/academic/computer-science/history/pdp-11/xxdp/
I hope that helps.
Julian
> -----Original Message-----
> From: cctalk-bounces at classiccmp.org
> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Jay West
> Sent: Sunday, March 26, 2006 7:22 PM
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: booting rt11 v5.1 on an 11/45
>
> The 11/45 will boot xxdp+ v1, but won't boot RT11 v5.1.
>
> Upon booting the RT11 v5.1 RL02 pack, the disk flashes for
> about 5-8 seconds, then the processor just halts.
>
> First question which I didn't see in the RT11 5x docs... what
> exactly would the hardware requirements be for RT11 5.1 on a
> 11/45? Is it expecting a minimum of memory? Certain I/O
> devices at certain locations? I tried both a real DEC RT11
> v5.1 RL02 dist. pack, and also was able to gen one from a 5.1
> image on a scratch pack with vtserver.
>
> The only thing I can think of (and another listmember point
> to as well) is a problem with interrupts. But I've no idea
> how exactly to go about troubleshooting it, not being a DEC
> expert like others here :) I've gone back and forth between
> using 8K core, 16K core, or 128k unibus memory.
> Similar results. My copy of xxdp+ seems a bit old, so most
> diags I have seem to have older names.
>
> Any thoughts are most appreciated!
>
> Jay West
>
>
I have a couple of Zenith power supplies, fit their models 151, I think,
maybe more. Anybody interested in taking these off my hands?
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
I've got an Escon Microcomputer/Selectric Interface System that looks
like it was sold as a kit. It appears to be a unit to convert a
Selectric I or II typewriter so it can be used as a computer printer. Is
anyone familiar with this unit, and any ideas about what it is worth? It
belongs to the widow of my friend who died last month, and I am trying
to help separate the good stuff from everything else.
Okay, so I was thinking, would it be possible to replace the regulators and
whatnot in a BA11 with several standard PC power supplies? Obviously there
would be adjustments that need to be made, but considering the DEC units are
now 20+ years old and the out-of-service modules may have dried up caps,
would this not be a possible option?
I'm just curious, I'm no electrician, nor have I looked over the leads yet.
Secondly, if I have less than half the BA11 box full of cards, do I need
both of the fans plugged in?
Julian
> -----Original Message-----
> From: cctalk-bounces at classiccmp.org
> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Don North
> Sent: Monday, March 27, 2006 3:04 PM
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: Curiosity about power supplies (BA11)
>
> Wolfe, Julian wrote:
> > Okay, so I was thinking, would it be possible to replace the
> > regulators and whatnot in a BA11 with several standard PC power
> > supplies? Obviously there would be adjustments that need
> to be made,
> > but considering the DEC units are now 20+ years old and the
> > out-of-service modules may have dried up caps, would this
> not be a possible option?
> Certainly possible, with either OTS PC style or switcher PS modules.
>
> For the 'classic' DEC brick-style regulator modules as in the
> BA11-K box:
>
> H744 ....... +5V @ 25A
> H7441 ...... +5V @ 32A (upgrade to the H744)
> H745 ...... -15V @ 10A
> H754 ...... +20V @ 8A & -5V @ 1-8A
> 54-11086 .. +15V @ 4A
>
> A standard BA11-K box has 2xH744 (or later 2xH7441), 1xH745,
> 1x54-11086, and usually a spot for 1xH754 (for core memory,
> not req'd if no core).
>
> Each of the backplanes (DD11-D/C) has one or two AMP MateNLok
> connectors that handle the power distribution to the various
> slots, typically a pair of 14ga wires for +5V, and one wire
> each for the other voltages. Each 9slot SU is nominally
> 10-15A max at +5V, easily handled by a small switcher.
>
> The main problem I see with OTS PC supplies is they are +12V
> and not +15V.
> Older DEC cards expect +15V input and do on-board regulation
> to +12V. Only some of the later MOS memory cards (like
> MS11-PB 1MB for the 11/44) expect
> +12V on the backplane (which is supplied directly from the
> BA11-A supply).
>
> I have built a benchtop debug station that uses a DD11-CK 4
> slot SU with an inexpensive +5V at 10A, +15V at 2A, -15V at -2A
> modular supply. I suppose it would be fairly straightforward
> to rip out the rear end of a BA11-K box an lineup 5 or 6 of
> these and completely replace the power subsystem.
> >
> > I'm just curious, I'm no electrician, nor have I looked
> over the leads yet.
> >
> > Secondly, if I have less than half the BA11 box full of cards, do I
> > need both of the fans plugged in?
> >
> For the BA11-K box remember the fans not only cool the boards
> but also the power regulators and internal power supply
> transformer. I would not disable one of the fans even if the
> box were lightly populated. Power supplies want to be in a
> cool environment, heat is your biggest enemy (besides time, I guess).
> > Julian
I pretty much counted on this being the answer, and again it was more of a
curiosity thing. Thanks :)
> >
> >
> >
>
>
> Of interest is the fact that he would start a group, probably yahoo
> group specifically for this stuff if there is not a group
already. He
> is wondering how much interest there really is in this hardware/
software?
As these are pretty much the only sort of B machine that started with
the
B 5000 that normal folks are likely to run into, there is going to be
some
interest in the future.
I think it would be *FAR* better to contact the owner first. From what
I've seen, the connection is slow and there is a lot of material there.
It is also possible the site could be mirrored on a faster connection;
after all, the guy is a ham and thus a good guy :).
<IMNSHO ON>
BTW, this site has been posted both here and on the Heath Listserver. It
is entirely possible that a number of people are hogging the bandwidth
and copying the site. If so, that kind of misuse could well result in
the site going down. Look at the notice on bitsavers!
<IMNSHO OFF>
> From: "James Fogg" <James at jdfogg.com>
> >
> > I just saw a reference to http://www.pestingers.net/pdfs/ on
> > the Heathkit Listserver. It looks like it has a number of
> > other computer manuals besides Heathkit. I've bookmarked it now :).
>
>
> When I find something incredibly useful I download the content because
> you never know when it will go away. Like just now the link above shows
> "service unavailable". Did you Download the content?
>
Umm, thanks but no thanks, it was a technical curiousity, not indicating
anything was broken.
> -----Original Message-----
> From: cctalk-bounces at classiccmp.org
> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Useddec at aol.com
> Sent: Monday, March 27, 2006 12:37 PM
> To: cctalk at classiccmp.org
> Subject: Re: Curiosity about power supplies (BA11)
>
> I have all of the replacement parts if are interested.
>
> Paul
>
