Re: DEC LPS11 Laboratory Peripheral System for PDP-11
that's a very nice looking unit, and the docs are a big plus. I can't speak as to the price, but it looks nicer than the 2 I have. I'll have to look for my docs. Paul On Sat, Apr 9, 2016 at 3:12 PM, Eric Christopherson < echristopher...@gmail.com> wrote: > I saw a DEC LPS11 Laboratory Peripheral System for PDP-11 somewhere and > was thinking of getting it just because of the Digital nameplate, but I > was too broke. Now I see that an ebay listing[1] of it has the ambitious > Buy It Now price of $1600 -- but that's with cabling and a book of > schematics, and they've tested it out at least a bit; and it has analog > in and out, and several specific boards in it. > > The one I found, on the other hand, is untested and doesn't have any > external goodies; it does seem to be populated with boards, but I don't > know what they are. It also seems to be lacking any analog in or out > (unless the "DISPLAY" port is an analog out). I'm wondering if there > would be a demand for this item. If so, I may have to send someone to > pick it up for me when the place is open next. > > [1]: > http://www.ebay.com/itm/DEC-LPS11-Laboratory-Peripheral-System-for-PDP-11-Analog-Digital-I-O-Ultra-Rare-/291440856658?hash=item43db3a8e52:g:KRYAAOSwDk5TzrBt > > -- > Eric Christopherson >
Re: H-11 Updates
> On Apr 9, 2016, at 7:19 PM, Richard Cini wrote: > > All — > > It’s been a productive two weeks with my pseudo-DEC Heath H-11. I got myself > an Emulex UC07 SCSI card and a SCSI2SD SCSI drive emulator. After a week of > noodling around with why the on-board diagnostics wouldn’t load (stupid LTC > jumper) I was able to confirm that the board and SCSI2SD setup worked. > Tonight I built an RD54 image of RT-11 v5.7 using SIMH and dd’ed it to the > card and now I have RT-11 5.7 running over SCSI. Yea! > > Rich Nice, somehow a SCSI2SD card sounds like a nice upgrade for several of my systems, but especially my PDP-11/73. Zane
RE: Voltage regulator with alternate voltage source...
Brent Hilpert wrote: > Well that's neat. Thanks. > I assembled the Cromemco kit version of the Cyclops > (The kit version presented an interface for a computer > rather than the scope drive of the magazine article. I was recently able to acquire the S-100 interface cards for the Cyclops. I'm hoping to take that step sometime this summer. > Hopefully you're more successful with your unit. Thanks. > (I think you'll find the MC7805 there is indeed plastic > not ceramic. Moto produced various power transistors > and regulators in those packages (case 90 in Moto parlance) > as well as a smaller version from the same plastic material) I think you're right. It is odd, not plastic like any IC I've ever seen. And it does have a purplish cast to it. > A 9V wall wart would probably do for the power supply I was worried about the "pseudo-DC" that most wall warts provide. > or remove the regulator At this point, I'm about to build the "real" supply anyway... Here are a few more recent photos: http://wsudbrink.dyndns.org:8080/images/cyclops-latest/P4070001.JPG http://wsudbrink.dyndns.org:8080/images/cyclops-latest/P4090001-2.JPG http://wsudbrink.dyndns.org:8080/images/cyclops-latest/P4090009-2.JPG Bill S.
H-11 Updates
All — It’s been a productive two weeks with my pseudo-DEC Heath H-11. I got myself an Emulex UC07 SCSI card and a SCSI2SD SCSI drive emulator. After a week of noodling around with why the on-board diagnostics wouldn’t load (stupid LTC jumper) I was able to confirm that the board and SCSI2SD setup worked. Tonight I built an RD54 image of RT-11 v5.7 using SIMH and dd’ed it to the card and now I have RT-11 5.7 running over SCSI. Yea! Rich -- Rich Cini http://www.classiccmp.org/cini http://www.classiccmp.org/altair32
DEC LPS11 Laboratory Peripheral System for PDP-11
I saw a DEC LPS11 Laboratory Peripheral System for PDP-11 somewhere and was thinking of getting it just because of the Digital nameplate, but I was too broke. Now I see that an ebay listing[1] of it has the ambitious Buy It Now price of $1600 -- but that's with cabling and a book of schematics, and they've tested it out at least a bit; and it has analog in and out, and several specific boards in it. The one I found, on the other hand, is untested and doesn't have any external goodies; it does seem to be populated with boards, but I don't know what they are. It also seems to be lacking any analog in or out (unless the "DISPLAY" port is an analog out). I'm wondering if there would be a demand for this item. If so, I may have to send someone to pick it up for me when the place is open next. [1]: http://www.ebay.com/itm/DEC-LPS11-Laboratory-Peripheral-System-for-PDP-11-Analog-Digital-I-O-Ultra-Rare-/291440856658?hash=item43db3a8e52:g:KRYAAOSwDk5TzrBt -- Eric Christopherson
Re: Stuff searching for new home around Duesseldorf, germany
I have a 3800 for free, Its in Portland Oregon USA. May take a couple months to get all the parts together but it was complete around 10 years ago was said to have one of the proc. drawers dead. Anyone interested email me. -pete On Sat, Apr 9, 2016 at 6:43 AM, Noel Chiappa wrote: > > From: Peter Koch > > > rumours are that kids do place stuff like this into their parents > > basement :-) > > I've even heard rumours of parents placing stuff like this into their kids > basements! > > (I certainly have some PDP-11's in my daughter's old bedroom! :-) > > Noel > >
Re: ADM 3a with no horizontal scan
On 04/09/2016 01:21 PM, Seth Morabito wrote: > I'm fairly surprised that the 7805 regulators died, and that they > present this symptom (no horizontal scan) upon their death. I'm sure > there are other marginal components that will need to be replaced, > so the restoration is not yet complete until I'm confident I'm not > stressing the new 7805s too much. Good job! You might check to see how much current and the input voltage of the 7805 is being fed. Too high a current or input voltage can cause the regulator to run hot. There are some remedies for that, such as replacing the regulator with a "simple switcher" type regulator module. --Chuck
Re: ADM 3a with no horizontal scan
Well, since it was such an easy job, I took a chance and replaced the two suspicious 7805 voltage regulators. The terminal works just fine now! http://imgur.com/a/wharu I'm fairly surprised that the 7805 regulators died, and that they present this symptom (no horizontal scan) upon their death. I'm sure there are other marginal components that will need to be replaced, so the restoration is not yet complete until I'm confident I'm not stressing the new 7805s too much. -Seth -- Seth Morabito s...@loomcom.com
In search of VAX 8550 or similar...
Would like to purchase and restore a big mid-80s VAX. Stupidly passed one up recently. Let me know if you have one you'd be willing to part with- also open to trades. In the Seattle area, but a little too comfortable with arranging freight shipping... Sent from Outlook for iPhone
Re: Voltage regulator with alternate voltage source...
Bill, surely you have a pile of 1N400x diodes someplace. Put 6 in series, forward, between the input and supply. That should ensure it is safe. If the voltage is higher than 8 volts, it would mean there isn't enough current to worry about. Dwight
Re: ADM 3a with no horizontal scan
Try renewing the thermal compound. Also, look for any really hot components on the 5V lines. Tantalums don't always smoke. A lot of older circuits also used a shunt resistor across the regulator to share part of the load. These were usually the square wire wound resisters. These often fail because of internal corrosion. When open the regulators carry the full load. Dwight
Re: A tale of a chip and a socket
On 04/09/2016 5:29 AM, Noel Chiappa wrote: > From: Torfinn Ingolfsen > Most likely a bad solder joint. That was my first thought, and so I carefully inspected all the pins, but they all looked good to me. But I suppose it might have been something that wasn't visually obvious. Noel If you suspect solder try simply reheating the legs of the suspect chip to see if that cures it. It could also be that the chip is drifting out of tolerance and the clip you put on it added enough extra capacitance (we're talking picofarads here) that it was happy again. The IC socket may add just enough capacitance again to help the chip get back into its operation band. Has anyone else got a similar board and that particular chip has a very small value cap on one or more of its legs? I see this on my 1970s video game boards from time to time - a board from the factory would have an added cap on one chip that isn't shown on the schematics or in my meagre collection of service bulletins for that game. The job was obviously factory as the connection is as clean as all the other connections on the board. Data books don't talk much about this bypass caps issue either, I believe it is part of the 'magic smoke' of TTL logic... John :-#)# -- John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames) www.flippers.com "Old pinballers never die, they just flip out"
Re: Stuff searching for new home around Duesseldorf, germany
> From: Peter Koch > rumours are that kids do place stuff like this into their parents > basement :-) I've even heard rumours of parents placing stuff like this into their kids basements! (I certainly have some PDP-11's in my daughter's old bedroom! :-) Noel
Re: A tale of a chip and a socket
> From: Torfinn Ingolfsen > Most likely a bad solder joint. That was my first thought, and so I carefully inspected all the pins, but they all looked good to me. But I suppose it might have been something that wasn't visually obvious. Noel
Stuff searching for new home around Duesseldorf, germany
Hi all, we have been using two Sun 6800 (each fully equipped with 96GB of RAM and 24 Sparc III processors 1.2GHz) for many years. Now they are retired and must leave our machine room to make place for newer machines. Anybody out there willing to give them a new home? They are very good in transforming electric energy into heat. And by activating only some of the processor boards you can regulate the heat flow. Your wife will love to stand behind it and use it as a whole-body blow-dryer. Take one for free and you will get another one for no additional costs. While rearranging our machine room, we found lots of other stuff that must go away too. Here's the current list: - Sun E250 - Sun A5200, 2xA5100, D1000 with lots of disks - Sun E450, 2x, one is still needed for a couple of months - Sun L1000, 3x, one is still needed for a couple of months - Sun 6800, 2 fully equipped and a third one for spare parts - Sun 880 with 12 disks - Sun 480 2x, with spare processor boards - Sun L11000 tape library (aka ATL P3000) with 6 drives and lots of tapes Be warned: You need a truck with lift to transport a Sun 6800. It's 191x130x61cm and weights approx 500kg. Same thing with the tape library: 192x72x145cm, approx. 600kg. On the other hand rumours are that kids do place stuff like this into their parents basement :-) I took some pictures and uploaded then to http://flic.kr/s/aHskuakSMT Peter
Re: A tale of a chip and a socket
On Fri, Apr 8, 2016 at 11:19 PM, Noel Chiappa wrote: > So I just had the incredibly amusing experience of managing to repair an > -11/04 CPU by un-soldering a chip, putting in a socket, and putting _the same > chip_ back in that socket! > > Before you go 'WTF?!?!', let me explain what happened. Most likely a bad solder joint. Happens from time to time on 30 years+ old equipment. -- Regards, Torfinn Ingolfsen
