> On Mar 17, 2018, at 6:57 PM, Fritz Mueller wrote:
>
> I have a question about floating CSR allocation on PDP-11s. Both the 1976
> and 1981 versions of the PDP-11 peripherals handbook indicate the floating
> CSRs are to be allocated starting at address 760010. However, both the XXDP
> FLOA
Hi folks,
I have a question about floating CSR allocation on PDP-11s. Both the 1976 and
1981 versions of the PDP-11 peripherals handbook indicate the floating CSRs are
to be allocated starting at address 760010. However, both the XXDP FLOAT
program and simh's autoconfig suggest I should set m
> On Mar 11, 2018, at 3:55 PM, Fritz Mueller wrote:
>
> I have found it very convenient to maintain a simh configuration that
> parallels the physical hardware configuration of my PDP-11/45. I'm just
> about to add a DR11-C for a physical interface that I am building -- this
> will "grab" a
Hi folks,
I have found it very convenient to maintain a simh configuration that parallels
the physical hardware configuration of my PDP-11/45. I'm just about to add a
DR11-C for a physical interface that I am building -- this will "grab" a
floating interrupt ahead of a DZ11 that I already have
> On Mar 4, 2018, at 11:09 AM, Noel Chiappa via cctalk
> wrote:
> OK, another pair of unknown extender cards:
Spring cleaning, Noel? :-)
> On Mar 2, 2018, at 5:37 AM, Noel Chiappa via cctalk
> wrote:
>
>> From: Jerry Weiss
>> Typically execution of the RESET instruction in a user program is
>> treated as a NOP
>
> Yeah, that's not documented in most PDP-11 CPU manuals, either. It's one of
> the things that makes the PDP-11 impo
On 12/26/2017 5:25 AM, Mattis Lind via cctalk wrote:
> Since the terminal appears to work I also dumped the firmware out of the four
> bipolar PROMs.
>
> http://storage.datormuseum.se/u/96935524/Datormusuem/VT52/124A9.HEX
> http://storage.datormuseum.se/u/96935524/Datormusuem/VT52/125A9.HEX
> ht
Hi Al,
I may have some Z-29 docs around, if that would be helpful? I’ll have a look;
if I can find them I’d be happy to send them your way for scanning.
—FritzM.
On Jan 27, 2018, at 11:05 AM, Mark J. Blair via cctech
wrote:
> Isopropyl alcohol. Not very good for drinking; even store-brand vodka in
> plastic jugs is less harsh. :)
Haha — I don’t think I’ve had any “jug vodka” since college house-party days,
but that takes me back :-)
—FritzM.
Thanks for the tip on heating, Carl.
> On Jan 27, 2018, at 11:02 AM, Mark J. Blair via cctalk
> wrote:
> Some dumb questions from a guy who has not yet experienced his first head
> crash on a removable-pack hard drive:
>
> When it happens, am I correct in assuming that the pack is toast, and
On Jan 27, 2018, at 8:46 AM, Noel Chiappa via cctalk
wrote:
> http://gunkies.org/wiki/RK05_disk_drive#Prefilter_frame
Thank you!
> On Jan 26, 2018, at 2:14 PM, Bill Degnan wrote:
> http://vintagecomputer.net/digital/pdp8e/RK05_ext-filter.jpg
> http://vintagecomputer.net/browse_thread.cfm?id=588
Thanks, Bill! I am also missing the brackets, so looking for pics of those as
well.
—FritzM.
My restored RK05 drives are missing their rear air filters (the ones that cover
the back of the card cage). I would like to fashion some sort of replacements.
If anybody here has access to drives with the original filters, I’d really
appreciate a few photos so I can see what these looked like
I watched with great interest one of curiousmarc’s recent Alto videos, wherein
they clean a Diablo drive head ultrasonically. I’ve been struggling a bit with
my restored RK05 drives to completely clean the heads after minor head crashes.
Not being able to get them really sparkling clean makes
On Jan 13, 2018, at 1:09 PM, Noel Chiappa via cctalk
wrote:
> Ah; the dual-wide plug-in connector soldered onto the back kind of threw me a
> bit!
Yeah it’s a bit weird, but mine has that too. It’s a pass-through, and It
turns out, handily, that that you can plug in a KM11 right there for
t
On Jan 13, 2018, at 10:30 AM, Noel Chiappa via cctalk
wrote:
> that exposed backplane above it _might_ be an RK11-C...
Definitely an RK11-C — having recently restored one in my 11/45, I can see the
flying components on the backplane here are in just the right places. And it
would make sense w
Hello PDP-11 crowd:
I’m thinking of starting a project that will interface to a DR11-C, which has
the usual 40-pin Berg ribbon cable connectors. I thought I’d ping the
collected wisdom here to see if other folks had already sourced an available
modern cable connector for this that they partic
> On Dec 27, 2017, at 8:23 AM, Paul Koning wrote:
>
> ; "A SOURCE OF INNOCENT MERRIMENT!"
> ; - W.S. GILBERT, "MIKADO"
> ; "DID NOTHING IN PARTICULAR, AND DID IT VERY WELL"
> ; - W.S. GILBERT, "IOLANTHE"
> ; "TO BE IDLE IS THE ULTIMATE PURPOSE OF THE BUSY"
> ; - SAMUEL JOHNSON, "THE
I have been able to sysgen an RT-11 XM monitor with the idle loop light pattern
enabled, and install and boot it on my PDP-11/45. Here’s a video of the idle
lights:
https://www.youtube.com/watch?v=ycADKwgnLpE
I built the latest simh and tu58em from source on my MacBook, then was able to
do th
On Dec 26, 2017, at 2:22 PM, Mattis Lind wrote:
>
> Before putting everything together I also dumped the chargen ROM board…
Ah, yes — I did this with my own VT52 last xmas break! I breadboarded a little
scanner for that task because my chargen ROM was not socketed, and I didn’t
want to risk d
> On Dec 26, 2017, at 3:25 AM, Mattis Lind via cctalk
> wrote:
>
> … Instead I came up with a small
> circuit (well stole actually from the VT100 schematics) that generated a
> composite video signal from the TTL signals generated by the VT52…
Oh — this is a cool idea! Will keep in the bag of
The most documentation I’ve seen re. the PROMs is pages A-1 and A-2 of the VT52
maintenance manual here:
http://www.pdp8.net/pdp8cgi/query_docs/tifftopdf.pl/pdp8docs/ek-vt52-mm-002.pdf
I think you’ve probably seen that already. I’ll post more info from my VT52
later when I make it downstairs t
Hi Mattis,
> On Dec 23, 2017, at 12:08 AM, Mattis Lind via cctalk
> wrote:
>
> Anyhow, the VT52 boards are dead. … The terminal uses 4 pieces
> of 256 by 4 bipolar PROMs for a total of 512 bytes of microprogram.
> Has anyone dumped the contents of these so I could verify them?
I have a restore
Hi Henk,
On 12/10/2017 04:08 AM, Henk Gooijen wrote:
One question: where did you find paper for this printer.
It is not a “standard” format …
I have about a third of a box of paper that came with the LA30 when I
picked it up from surplus many years ago.
I've ordered a new box of paper from
Got the last replacement components I needed for my LA30 restore today,
and finished it up! Here's a short video of the LA30 connected as
console to my restored PDP-11/45:
https://www.youtube.com/watch?v=gMIL2bvUYIs
Hi all, an update on the sourcing questions below:
> On Nov 11, 2017, at 5:53 PM, Fritz Mueller wrote:
>
> I noticed that a few of the thin steel ribbon springs in the paper path are
> missing or broken on my unit, and some of the rubber bushings have hardened
> and deteriorated. Long shot as
Hi folks,
I'm picking my way through an LA30 restoration right now. It was pretty
filthy, so I've needed to pretty thoroughly disassemble it for proper
cleaning.
I noticed that a few of the thin steel ribbon springs in the paper path
are missing or broken on my unit, and some of the rubber
> On Aug 19, 2017, at 10:10 PM, Mattis Lind wrote:
>
> BTW. I have LC11 manual and drawings. But they are for the older M791. At
> least a bit helpful. Not scanned yet.
I'd be very interested to see those once scanned. I haven't gotten to the
interface card yet; so far I've just been working
On 08/17/2017 12:54 PM, Noel Chiappa via cctalk wrote:
Anyone out there have an LA30? :-)
For future reference, I am also working on an LA30 at the moment. I
think Mattis has restored one as well?
Mine is a P, and I have the matching M7910 to go with it, so no need for
an M7389 here (sound
> On Aug 1, 2017, at 7:37 PM, Jerry Weiss wrote:
>
> It is possible to install the TCP/IP Package on a 248K
> machine using the DEUNA/DELUA 18-bit (Non Unibus Map-
> ping) EU18XM.SYS handler.
Thanks Jerry, I'll check that out. Might also be a bit of work to
On 08/01/2017 05:27 PM, Jerry Weiss wrote:
If you install the DELUA, don’t forget there is TCP/IP support for RT11
from Alan Baldwin at http://shop-pdp.net/rthtml/tcpip.htm.
Hi Jerry -- I had seen the RT-11 TCP/IP stuff, but my 11/45 can only
address 256K of memory, so doesn't meet the minimum
On 08/01/2017 01:23 PM, Jay Jaeger wrote:
I have posted my code (and pinouts) on Google Drive at:
https://drive.google.com/open?id=0B2v4WRwISEQRUUxuNGhZRENvYjQ
Thanks, Jay -- I'll check it out!
Mattis: I *do* have a DELUA, actually, but haven't slotted it yet to
check it out. Your suggest
On 08/01/2017 10:16 AM, Al Kossow via cctalk wrote:
Another stillborn project?
I don't see any software to make the Beaglebone talk Unibus
Yes, this one has been around for a couple years now but sadly doesn't
seem to have progressed...
On 07/31/2017 12:15 PM, Don North wrote:
Arduino UNO (the 'original') and the Mega2560 big brother both use 5V
I/O microprocessors, so all the I/O is directly 5V capable.
Awesome, that seems like the way to go, then -- just need to bodge the
appropriate cables. I'll check it out!
--FritzM
> On Jul 31, 2017, at 11:30 AM, Bill Gunshannon via cctalk
> wrote:
>
> Well, I'm confused now. What do 16 bit paralel and ethernet have to do with
> each other?
Nothing, directly; confusion created by poor quoting on my part, probably! The
goal is a higher-bandwidth and higher-convenience
> On Jul 31, 2017, at 8:19 AM, Jay Jaeger wrote:
>
> I have Ethernet shield for my Arduino Uno, and I use that and a simple
> (in my case, perl, program to talk to the final destination device. I
> have two cables, one for each direction, from the DR11-C (not using DMA)
> to the Arduino.
Awes
So, I have lately been using PDP11GUI to retrieve images of RK05 disk packs and
to write images to these packs on a PDP-11. This is awesome, but its a bit
frustrating that it takes a couple hours to read or write an image this way.
I do, however, have a couple of DR11-C parallel interface cards
> On Jul 24, 2017, at 2:25 PM, Noel Chiappa via cctalk
> wrote:
>
> http://gunkies.org/wiki/File:RK05Head.jpg
> http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/jpg/RK05HeadRefl.jpg
Thanks, Noel, that's very helpful! A recent picture of the upper head in my
drive:
http://www.slac.stanford.edu/~f
Thanks for the advice, per usual, folks!
To answer the question of "where hard to see", I guess it's really an issue of
my old-man-eyes at this point. I find I need to use a jeweler's headset, or
even bench microscope, to really see anything small in detail these days. It's
hard to do that wi
Thanks for the advice, per usual, folks!
To answer the question of "where hard to see", I guess it's really an issue of
my old-man-eyes at this point. I find I need to use a jeweler's headset, or
even bench microscope, to really see anything small in detail these days. It's
hard to do that wi
Hey folks:
As some of you know, I've recently restored a PDP-11/45, RK11-C drive
controller, and an RK05 drive. I'm now at the point where I'm working to
recover and archive the contents of the dozen or so RK05 packs that I got along
with the drive and controller.
I've been inspecting and cle
Update: have now tracked down an H317-E, from a list-member. Thanks, all!
> On Jul 23, 2017, at 9:04 AM, Noel Chiappa via cctalk
> wrote:
>
> Here ya go:
>
> http://www.ebay.com/itm/321225351590
Oh, great -- thanks! I'll make an offer on one of those.
I'd still like to keep an eye out for an H317-E, since my /45 is in H960 19"
racks, but this will help to get
> On Jul 22, 2017, at 3:42 PM, John Wilson via cctalk
> wrote:
>
> I don't have anything to spare, but you need to say whether you mean
> DZ11A (EIA) or DZ11C (20 mA) before anyone can hook you up, since
> they're entirely different cab kits.
Oh, yes -- I mean the DZ11A (EIA). Sorry I forgot t
Hi folks,
I'm in need of cabling and a distribution panel for a DEC DZ11 serial mux that
I'd like to put in a PDP-11/45. Before I embark on building something up from
scratch I thought I'd ping here and see if anybody had all or part of this on
hand and would be willing to work out a deal? Hi
Well, the situation had worsened on my M9301 to the point where every single
word was affected, and then it was easy to see that it was always in the
least-significant four bits. So I pulled and reseated that PROM, then went
ahead and did the other three as well for good measure (really should
Hi folks, thanks for all the help!
> On Jul 4, 2017, at 8:34 AM, Noel Chiappa via cctalk
> wrote:
>
>> I see a few words with different values than the ones that Noel has
>> listed in his partial M9301-YB disassembly.
>
> Any chance you could send in some of the differences? I can take a look
Hi folks,
An M9301-YB bootstrap terminator that I’ve been using during the restoration of
a PDP-11/45, which has previously worked fine, now seems to be failing on me.
Examining the contents from the front panel I see a few words with different
values than the ones that Noel has listed in his
The first two packs I opened up for cleaning had foam around the inside of the
hub. If it is decaying like the rest of the foam DEC used this seems like it
could be a problem inside the packs?
I haven’t seen this discussed before in any of the RK05 pack cleaning threads.
Do folks usually leav
> On Apr 1, 2017, at 2:53 PM, Marc Howard wrote:
>
> BTW, have you replaced the emergency head retract batteries and/or allowed
> them to reach full charge?
Yes, have done replacement. Haven’t put a charge on them yet, but figured
running the drive for a couple hours with disabled head load
> On Jan 5, 2017, at 8:48 AM, Rick Bensene wrote:
>
> The method I've used very successfully for unknown packs is:
>
> 1) I first mount the pack in a drive that has a good absolute filter,
> and has had the head load disabled, and spin it for a few hours.
I’m getting to the point in my RK05 re
> On Mon, Mar 13, 2017 at 4:45 PM, Marc Howard via cctech <
> cct...@classiccmp.org> wrote:
>
>> Hi,
>>
>> The "2" key on my VT52 is very hard to use. You've gotta pound it and you
>> might get 2 "2"s for your trouble.
I've a similar key on my VT52 -- will be diving in there sometime soon to ch
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