test-drb December 2016

test-drb@ccmp.vtda.org

156 participants
199 discussions

by shatle＠nfldinet.com

-------- Original Message -------- Subject: Re: ADM-3A Lower case ROM issue From: J?rg_Hoppe <j_hoppe at t-online.de> Date: Wed, December 14, 2016 9:00 am To: cctech at classiccmp.org By accident, I just now restored an ADM3 (not the "A")! Lowercase ROM was made with an pin-rearranged 2706 EPROM. Additional RAM was inserted, DIP switches were set: works perfectly. However, with lowercase ROM installed and DIP switches set, but extra RAM missing, the Space "0x20" was displayed as a " ` ". So I think you have an RAM issue. Perhaps cleaning the socketed extra RAM helps? Joerg ---- Thanks - that sounds like my symptoms exactly. I'll check out the RAM. Steve

7 years, 5 months

ADM-3A Lower case ROM issue

by shatle＠nfldinet.com

I acquired an ADM3-A a while back from the NWA auction, and a generous friend was able to get me the lower case ROM chip that was "missing" from my terminal. I set the DIP switches and installed the ROM. When I turned on the terminal, the whole screen was filled with "`" characters before the host was ever started. When I started up the connected Sun machine, the terminal did display both upper and lower case characters, but the "`" characters remained and appeared to fill out each new line, and text printed out by the machine was followed by garbage characters - like "Login:nzzzz". Typed characters were correctly upper or lower as typed. I removed the ROM and cleaned the legs of the chip. I didn't clean the socket, since I didn't have anything like DeOxit handy. I did remove and re-insert the ROM a couple of times. When I removed the ROM and set the DIPs back to the original setting, the terminal worked like normal in all upper case. Setting the DIPs to force upper case, etc. when the ROM was in always showed the bad behavior though the characters were upper/lower as you would expect from the switch settings. TL;DR - bad and extra characters when the ROM chip is in, everything OK when it's out. So, barring a bad connection to the chip while it's in the socket, it seems like the ROM itself could be bad. I'll dig through the maint manuals and see if I can find anything related to this behavior. In the meantime, any ideas from the collective are welcome.

7 years, 5 months

Megatek Series 7000 Graphics System?

by holm＠freibergnet.de

Hi, I've got a card cage full of cards that seems to be a Megatek Graphics Subsystem. I've found a board with coaxial connectors that seems to be the Video Output Board, a CPU build out of two stacked cards, one with 8 pcs. AM2901BC and some Memory.. One fo the card(stacks) has front connectors looking like Unibus (or QBus). There is no PSU attached to the card cage. After googeling around I think the thing is related to a Megatek 7250 graphics Terminal mentioned here an there..but no pictures could be found. Is there soemone that has more informations about that thing? The megatek is an a bad shape, Crystal oscillators are heavyly corroded on the outside, it sat for 20+ years somewhere on the Attic. I'll make some Pictures next week .. Regards, Holm -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583 info at tsht.de Fax +49 3731 74200 Tel +49 3731 74222 Mobil: 0172 8790 741

7 years, 5 months

looking for keytronics keyboard pad replacement kit

by shatle＠nfldinet.com

-------- Original Message -------- Subject: RE: looking for keytronics keyboard pad replacement kit From: william degnan Date: Wed, December 14, 2016 5:01 am To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Ok, to me it looked like they did not. The description implies one should transplant them from wherever to the replacement pads. I will ask the seller. Bill Degnan twitter: billdeg vintagecomputer.net ---- Do tell when you find out. If the metallic pads are already there, I'm probably in for a couple of sets :-) Steve

7 years, 5 months

looking for keytronics keyboard pad replacement kit

by billdegnan＠gmail.com

There was a seller on ebay who had a set of the pre-made keyboard key pads for sale...anyone here selling these? Yes I could make my own, I have gone through the process, but I'd like to buy a set or two as I have a few keyboards to repair. it's a time consuming process. Thanks in advance. Bill

7 years, 5 months

ARPAnet maps

by jwsmail＠jwsss.com

A friend posted an interesting map of the network as it grew (his interest was the 1981 map) of Arpanet interconnects. They range from the beginning to at least that map. I can't share that one both because it's on Facebook, and because it was low quality having been bastardized by FB and I couldn't find it online. There are a huge number indexed on google if you care to look. Just put in "arpanet logical map" to get huge numbers of maps. I don't know if anyone has made an index, but with the number there are it would be an interesting exercise to do a chronological and map graph index of the information. Anyway one map caught my eye, showing a "MICRO810" at UCSD. I am hoping maybe it was a Microdata 810, but have no way of looking it up. The box immediately above is B6700, so it may be doing some sort of front end for that system. The node names were said to be IMP names on one of the maps I found, and one would hope that IMP's had all the frontend support to go to most mainframes. thanks Jim January 1975 map on sympatico.ca n.rieck account maybe? http://www3.sympatico.ca/n.rieck/docs/vms_vs_unix.html image link if you can get it to work https://public.dm2301.livefilestore.com/y3pO0l02Dnf4e9HK-IeRoPuXuAFGKavc7GL…

7 years, 5 months

SGI Indigo Update

by ethan＠757.org

I started updating my blog with (hopefully useful) information. I did a write up on the SGI Indigo so far and will update it with future findings. It's at http://ethan.757.org/?p=32 I made a list of all the tantulum SMD capacitors of the style of the one that fried. I think I figured out digikey part numbers for most (And published the sizes I measured of the caps.) If the cap that fried belongs to the audio section, I was thinking maybe those components use negative PSU voltages (op-amps, DACs) so maybe the PSU is doing something funky. Finding a pinout for the Indigo PSU might take a little bit of work -- but since I have mine apart I should be able to document some of it. So many projects! -- Ethan O'Toole

7 years, 5 months

TOPS-20 Telnet and Port Forwading issue

by lists+cctalk＠loomcom.com

Hi folks, I don't know if this is the best place to ask this question, but I don't know of any better forums for PDP-10 discussion, so hopefully it's on-topic enough. I recently set up the KLH10 PDP-10 emulator on my network, running TOPS-20 7.1. It's on a box in my 192.168.1.0/24 network. TCP/IP works great, I can telnet to it from within my network without any issue. I also set up my firewall (a box running CentOS 7.1) to port forward >from external TCP port 2320 to internal TCP port 23 on the KLH10 box. Interestingly, when I telnet from _outside_ the network to my firewall's port 2320, it works, but Telnet goes into line mode rather than character mode! I can fix it with telnet escape (^]) by setting character mode explicitly with "mode character", but that's kind of annoying to do each time I connect. It feels like Telnet is no longer doing line mode / character mode negotiation when I'm port forwarding. It's most mysterious. If you want to see for yourself, you can telnet to gatekeeper.retronet.net 2320, which is the KLH10 instance. Does this ring any bells for anyone? -Seth -- Seth Morabito seth at loomcom.com

7 years, 5 months

Local Pickup of PDP-11 Qbus Hardware, Software and Manuals

by jhfinedp3k＠compsys.to

As I find that there is less and less need for my PDP-11 Qbus Hardware, Software and Manuals, I wish to determine if there is any interest in my local area to transfer everything using local pickup in Toronto. As some of you know, my interest is in RT-11 on the PDP-11 and I have been doing it since the 1970s. If there is sufficient interest to come by and do a local pickup, then please send me an e-mail with a local phone number in area code 416 or 647 (or 905 which can be called locally from 416) so we can arrange something. The total volume of everything, including probably at least 30% junk, is probably ten to twenty cubic meters (100 to 200 cubic feet), so there will need to be some sorting done along the way. As for hardware, the collection is mostly BA23 and BA123 boxes with PDP-11/73 and one PDP-11/83 along with assorted Qbus boards. There are many VT100, VT220 and VT320 terminals as well. There are many PDP-11 manuals and DOC sets for RT-11. I download my e-mails rarely these days, so it may take even a few weeks before I reply. Jerome Fine

7 years, 5 months

Zenith Z160 Luggable PC aquired

by barythrin＠gmail.com

I'm not sure specifically on the z-160 but my z-150 had it (iirc and it's been a while ctrl+alt+ins or ctrl+alt+enter) I think put you in the diagnostic rom which had a debugger. Curiously though i dont know if that is a hardware function or a feature of zdos? -------- Original message --------From: Fred Cisin <cisin at xenosoft.com> Date: 12/11/16 6:59 PM (GMT-06:00) Don't those machines have a debugging monitor in ROM?? (something that IBM does NOT)? Otherwise DEBUG.COM should work.

7 years, 5 months

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test-drb December 2016