DCC-116 E / DATA GENERAL NOVA 2/10 / Nixdorf 620 - Restoring and restarting
Dominique Carlier
dce at skynet.be
Thu May 18 08:08:37 CDT 2017
Hi,
I saw this ad but the shipping costs until Belgium decided me to react
as if I had not seen anything ^^
It's a pity, I would have taken a few boards.
On 18/05/2017 06:05, AJ Palmgren wrote:
> My search for this was prompted by my seeing one on eBay:
>
> http://www.ebay.com/itm/282462822861
>
> Did anyone here purchase it, or know who did? Just curious, since
> these seem so rare and interesting.
>
> Best,
> -AJ
>
> On Wed, May 17, 2017 at 8:29 PM, AJ Palmgren <microtechdart at gmail.com
> <mailto:microtechdart at gmail.com>> wrote:
>
> Dominique,
>
> I'm quite interested in seeing your Entrex/Nixdorf system
> restored. Please keep us updated here. Nice work saving these
> rare items!
>
> I've done some of my own work restoring a DG Nova-type system. (
> http://Point4iris.com ). I'd love to see if there's any way I
> could help.
>
> I'll read Christian Kennedy's response here, as he seems FAR more
> familiar and knowledgeable than I am here, but if I can add value
> in any way, I would love to.
>
> Best,
> -AJ
>
> On Sat, Apr 1, 2017 at 12:33 PM, Dominique Carlier via cctalk
> <cctalk at classiccmp.org <mailto:cctalk at classiccmp.org>> wrote:
>
> Hi guys !
>
> My name is Dominique, 43 , from Belgium (I apologize in
> advance for my approximate English). I join this forum under
> the recommendations of Curious Marc. It seems there are people
> here who can help me to get back to life the venerable machine
> that I have just recovered.
>
> Some pictures of the beast :
>
> http://www.actingmachines.com/classiccmp_forum/overview01.jpg
> <http://www.actingmachines.com/classiccmp_forum/overview01.jpg>
> <http://www.zeltrax.com/classiccmp_forum/overview01.jpg
> <http://www.zeltrax.com/classiccmp_forum/overview01.jpg>>
>
> http://www.actingmachines.com/classiccmp_forum/terminal.jpg
> <http://www.actingmachines.com/classiccmp_forum/terminal.jpg>
> <http://www.zeltrax.com/classiccmp_forum/terminal.jpg
> <http://www.zeltrax.com/classiccmp_forum/terminal.jpg>>
>
> http://www.actingmachines.com/classiccmp_forum/comrack_closeup.jpg
> <http://www.actingmachines.com/classiccmp_forum/comrack_closeup.jpg>
> <http://www.zeltrax.com/classiccmp_forum/comrack_closeup.jpg
> <http://www.zeltrax.com/classiccmp_forum/comrack_closeup.jpg>>
>
> It is a "Nixdor 600 series" (Apparently a Nixdorf 620/35),
> upgraded several times until 1980, the CPU board is dated from
> this year. So I do not know exactly what machine it is today
> the equivalent.
>
> Anyway, the Nixdorf 620 is actually built by "Digital Computer
> Controls" and after some researches it seems that it is a
> "DCC-116 E", the 17 slot version of the "DCC-116" which Is a
> clone of the "Data General Nova 2/10".
>
> http://www.actingmachines.com/classiccmp_forum/DCC.jpg
> <http://www.actingmachines.com/classiccmp_forum/DCC.jpg>
> <http://www.zeltrax.com/classiccmp_forum/DCC.jpg
> <http://www.zeltrax.com/classiccmp_forum/DCC.jpg>>
>
> The machine has five Key-stations (ENTREX DATA/SCOPE), a
> Mag-tape Pertec 8840A - A Disk Cartridge Diablo Model 40 and a
> big line drum printer (Data Products model 2230), strange
> machine, there is a tape reader inside the printer.
>
> Here is the list of the boards I have with the references
> written on them and their position in the machine:
>
> *17 HEX 0 – 15 ENTREX INC 62 00 01842 002
> REV A*
>
> *16 HEX 16 30 31 ENTREX INC 62 00 01842 002 REV A**
> 15 OPTION 2 Empty**
> 14 OPTION 1 Empty**
> 13 PRINTER ENTREX INC SN598**
> 12 TAPE 556/800 BPI 2433 LFI 213**
> 11 TAPE 1600 BPI Empty**
> 10 DISK 2456 00 MP-Kontroller
> D44an620 6393500215 <tel:6393500215> 2456 7 0 1577**
> 09 COMMO Empty**
> 08 SCANNER Scanner BD 2431 NCAG 54147.1.15
> 2431 02394**
> 07 MEM 1609 0 7 02616**
> 06 MEM Empty**
> 05 MEM 1609 0 8 02367**
> 04 MEM 1615 01 9 5596**
> 03 TTY Empty**
> 02 DO NOT USE Empty**
> 01 C.P. 1509 05 4 04436*
>
> Concerning this I also ask a few questions:
>
> *
>
> What are the boards in slots 16 and 17 for?
>
> *
>
> I do not have a COM card, does that mean that I could not
> attempt a
> serial transmission (type rs232) with this actual setup ?
>
> *
>
> I have no idea how many kilobytes are present, apparently
> there are
> two core memory cards (8kb each? 16Kb each?), And non-core
> RAM board.
>
> I first solved a problem with the power supply of the disk
> pack (bad HF filter, short-circuited with the chassis, then it
> is also dead HF filter in the "multi-plug" of the chassis that
> start to burn, once these problems were solved, I cleaned the
> machine thoroughly, cleaning the heads of readings with
> isopropyl alcohol, I Not yet cleaned the disc himself which at
> first glance looks extremely clean, it has not left the
> machine for 30 years.
>
> http://www.actingmachines.com/classiccmp_forum/disckpack01.jpg
> <http://www.actingmachines.com/classiccmp_forum/disckpack01.jpg>
> <http://www.zeltrax.com/classiccmp_forum/disckpack01.jpg
> <http://www.zeltrax.com/classiccmp_forum/disckpack01.jpg>>
>
> I cleaned all the guides and the heads of the nine track tape
> Pertec 8840A. There was also a false contact in the ON-LINE
> button. I did a first cleanup. I think there is always a
> problem with the HI-DEN button used to set the magtape to
> 800BPI. It is currently ineffective, but I have a doubt about
> the contacts of the lamp socket).
>
> http://www.actingmachines.com/classiccmp_forum/ninetrack.jpg
> <http://www.actingmachines.com/classiccmp_forum/ninetrack.jpg>
> <http://www.zeltrax.com/classiccmp_forum/ninetrack.jpg
> <http://www.zeltrax.com/classiccmp_forum/ninetrack.jpg>>
>
> I then cleaned all the sockets and contacts at the boards of
> the computer (logic and PSU)
>
> http://www.actingmachines.com/classiccmp_forum/clean_contact.jpg
> <http://www.actingmachines.com/classiccmp_forum/clean_contact.jpg>
> <http://www.zeltrax.com/classiccmp_forum/clean_contact.jpg
> <http://www.zeltrax.com/classiccmp_forum/clean_contact.jpg>>
>
>
> Unfortunately, after a couple of hours, the "POWER FAIL" light
> has started to light up. The problem here is that I have no
> schematics, it is a modular power supply consisting of two
> elements:
>
> http://www.actingmachines.com/classiccmp_forum/psus.jpg
> <http://www.actingmachines.com/classiccmp_forum/psus.jpg>
> <http://www.zeltrax.com/classiccmp_forum/psus.jpg
> <http://www.zeltrax.com/classiccmp_forum/psus.jpg>>
>
> One seems to be dedicated to the 15 VDC regulated, the second
> module is in charge of the regulated 5VDC. Both elements have
> a "Power fail module". When the machine is completely
> populated I now observe that the + 5VDC collapses at +1,9VDC.
>
> Here what I measured out, you will also see what the boards of
> these power supply look like.
>
> http://www.actingmachines.com/classiccmp_forum/psu_module_1.jpg
> <http://www.actingmachines.com/classiccmp_forum/psu_module_1.jpg>
> <http://www.zeltrax.com/classiccmp_forum/psu_module_1.jpg
> <http://www.zeltrax.com/classiccmp_forum/psu_module_1.jpg>>
>
> http://www.actingmachines.com/classiccmp_forum/psu_module_2.jpg
> <http://www.actingmachines.com/classiccmp_forum/psu_module_2.jpg>
> <http://www.zeltrax.com/classiccmp_forum/psu_module_2.jpg
> <http://www.zeltrax.com/classiccmp_forum/psu_module_2.jpg>>
>
> Another thing I noted during my measurements, where I should
> (I think) measure 15V, I have 18V, looking at the
> documentation on the NOVA 2 (4 slots), I observed according to
> the diagrams below That there is 18V but before a zener diode
> and not at the level of connectors where there must be 15VDC,
> should I warn me ? Would the diode be dead ?
>
> I tried to join temporarily a secondary regulated power supply
> to reinforce the + 5VDC so as to be sure that the problem did
> not come from the logical part of the computer which checks
> these voltages and triggers the Power Fail status. By coupling
> this external regulated power supply, the computer restarts
> again, thus it is definitively the power supply (or the
> comparator component(s) of the power fail module)
>
> If I removes all the boards (printer, core memory, scanner,
> disk controller, etc.), the Power Fail light eventually goes
> out, I get again the 5VDC, so the power has become "too weak"
> to power the computer when it is fully populated.
>
> Despite the temporary (and dangerous) look of my assembly with
> secondary power supply, I could not stop myself and attempt a
> boot procedure via the Cold Start button of the machine from
> the Disk Pack, and it works! :-)
>
> http://www.zeltrax.com/classiccmp_forum/first_boot.jpg
> <http://www.zeltrax.com/classiccmp_forum/first_boot.jpg>
>
> It seems that I still have problems with the magtape, I had
> errors trying to read a backup, but it may be simply because I
> still cannot get the machine in 800BPI because of the
> capricious buttons of the front panel. I also wrote a tape
> mark via a "WRITE TAPE MARK AND REWIND" function, the mark
> seems to be written but does not do the Rewind, however if I
> launch a REWIND only function, it executes the action
> appropriately. In short, still things to investigate on this side.
>
> Notes that the Operating system I used to make these tests is
> a very limited OS named DIDOS which was distributed by Nixdorf
> for his 620 Serie. As the machine is a clone of DG NOVA 2/10,
> I wonder if the computer is compatible with programs for the
> NOVA series of Data General? So I wonder if the DCC-116 was
> compatible with the software for NOVAs?
>
> The other questions I ask myself at this point are the ways to
> transfer softwares or bootable OS on this machine? I have no
> other disk pack on another system but I have a nine track tape
> TU81 + connected to a VAX 4000-605A under OpenVMS 6.2, and I
> can put this computer on my network. Do you think there's a
> way to make a bootable tape for my NOVA 2 clone with the
> Pertec 8840A from a VAX 4000 with a TU81+ ?
>
> Well, to continue, I have to repair this PSU, all information
> is welcome, schematics would be ideal of course.
>
> Finally, note that I am not a professional electronics
> technician, I fixed a lot of machines basic knowledge,
> intuition, researches, comparisons and logic, it is effective
> but full of limitations too, so forgive me in advance If I do
> not always understand the possible answers of electronics in
> "high engineering" mode ;-)
>
> As a bonus, the V1 of a small video mounted with a few clips
> captured during a session of my nocturnal repairs, during the
> first boot of the machine since 3 decades ! (on my music, yes,
> I'm also a composer ;-) )
>
> https://youtu.be/5jWOUtLKRIU
>
> Thanks a lot to all in advance ;-)
>
> Dominique
>
>
>
>
> --
>
> Thanks,
> AJ Palmgren
> http://fb.me/SelmaTrainWreck
> https://www.facebook.com/profile.php?id=100010931314283
> <https://www.facebook.com/profile.php?id=100010931314283>
> https://www.linkedin.com/in/aj-palmgren-4a085516/
> <https://www.linkedin.com/in/aj-palmgren-4a085516/>
>
>
>
>
> --
>
> Thanks,
> AJ Palmgren
> http://fb.me/SelmaTrainWreck
> https://www.facebook.com/profile.php?id=100010931314283
> https://www.linkedin.com/in/aj-palmgren-4a085516/
>
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