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101090 discussions

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

8 years, 12 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…

9 years

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

9 years

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

9 years

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

9 years

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.

9 years

IBM Server 7587

by w9gb＠icloud.com

IBM has had a number of "industrial computer" models. The IBM Server 7587 is a hardware platform designed for reliable 24 hour operation. It was often used in mid-1990s computer telephony interfaces (Pentium socket 7, up to 233 MHz). Responding to the customer's need for a powerful, reliable ISA bus computer that is easy to panel/wall mount and easy to service, IBM developed the IBM 7587. It is a 5 slot ISA/PCI passive backplane, PICMG compliant computer powered by an IBM Single Board Computer. The 7587 has a large filtered cooling fan that keeps the internal components well under their operating limits, even in hot environments. With its shock mounted hard disk drive and adapter hold down bracket, the system can withstand the shock and vibration found in many harsh work environments. Programming interfaces are supported for watchdog timer and thermal monitoring functions on the SBC. The system can operate without disk, display or keyboard. It is quick to service, with all internal components easily accessible after removing the top cover. Sent from iPad Air Sent from iPad Air

9 years

looking for keytronics keyboard pad replacement kit

by barythrin＠gmail.com

Did you ask on vcfed forums? I do recall a few years ago one or two folks offering to make sets although being years ago you may have been one of them :-) -------- Original message --------From: william degnan <billdegnan at gmail.com> Date: 12/11/16 4:17 PM (GMT-06:00) To: cctech <cctech at classiccmp.org> Subject: looking for keytronics keyboard pad replacement kit 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

9 years

Zenith Z160 Luggable PC aquired

by lyokoboy0＠gmail.com

Picked this up a while back, just getting around to messing with it. Appears to be an IBM XT compatible machine in a portable....err luggable size. Dual 360K drives, although the second one does not seem to be working. I can get it to boot to dos, but run out of space quite quickly. Anyone have any experience with these machines, is it possible to upgrade the drives in there? There appear to be isa card slots inside, i was thinking as a last resort to swap out the floppy controller and put some new drives in it. That space limitation is really making it a doorstop. I have a parallel port hard drive, but the driver takes up too much space and will not fit on the boot disk. --Devin https://s20.postimg.org/t0ozx0iul/IMG_0018.jpg https://s20.postimg.org/cqytu486l/IMG_0022.jpg

9 years

AT IBM Industrial's for sale (Ebay warning)

by james.w.stephens＠gmail.com

I have contact with a motivated seller who has a huge bunch of IBM Industrial systems to sell. They are Model 7587, and were used on the Kansas Turnpike to run printers and the like (maybe other stuff). he has about 50 of the things and has them listed for $15 bucks, but is motivated to sell any / all. If anyone wants a nice AT system with 4 slots and power supply this would be one to get. It has a single board computer type system card in it, so I suspect the backplane is passive. I have a friend working on the full documentation, as he did sell them a long time ago. He said they were made for IBM by a company which also sold a lot of the stuff, Par (sp?) Contact me and I'll put you in direct contact with Ron. He is moving and has to get rid of them or trash them. I don't have room for them all or I'd store them and parcel them out of my warehouse. Ebay listing below has the information about them, but we can get them direct. If anyone has any ideas on the shipping charges, Ebay is screwing him horribly and help would be appreciated to get them shipped at a better rate. Thanks Jim http://www.ebay.com/itm/262750011708

9 years

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