test-drb

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101090 discussions

by aperry＠snowmoose.com

Anyone here have a set of Sun external SMD cables (530-1079 and 530-1080) that they can loan or want to sell? I ordered from a set from MemoryX at the beginning of Jan. They haven?t arrived and MemoryX isn?t answering my e-mail asking what?s up. alan

6 years, 2 months

Respond to items I offer offlist please

by couryhouse＠aol.com

Respond to items I offer offlist please

6 years, 2 months

Have extra ge. G11a. First GE landmark transistor for counter and computer cicurits

by couryhouse＠aol.com

Ok offer me offlist for our extra transistor unused? in box sealed in original cellophan6... Have extra ge. G11a. First GE landmark transistor for counter and computer cicurits Germanium Whisker Transistors ? Robert Hall returned to General Electric Research Laboratories Schenectady just as Bell announced its point-contact transistor.??Hall had just graduated PhD from Caltech and had previously worked at the laboratories on a range of projects including the Harper North Wartime radar diode project. Dr Albert Hull was Assistant Director of the Laboratory. He was known for his collegial management style with a relaxed approach to the research agenda of his staff members. Hall recalls that Hull came in with the reprint of the Physical Review letters that announced the transistor [Bardeen 1948] and said ?Robert here?s an interesting development from Bell Laboratories. It looks like something pretty new and exciting. Would you like to look into it and see if there?s anything interesting there.? [Choi 2004] General Electric had all the knowhow it needed to duplicate the Bell design quickly. North?s diode programme had diodes that could handle 100 volts back voltage which was state of the art at that time. (Purdue University produced the high back voltage germanium for the Bell point contact transistor.) North?s diode programme and related research ensured it had a manufacturing understanding of the key technologies: High back voltage poly-crystalline germanium; Doping; Point contact design; Welding or forming; and Assembly and encapsulation. Its first designs were crude with two pins for the collector and emitter with the base connection through the case in the manner of the Bell Type A. No socket was available and users were recommended to use a 5 pin subminiature tube socket using positions 2 and 3 for the collector and emitter and to create a base connection by inserting phosphor-bronze strips in positions 1 and 4 and bending them so they contacted the transistor case. The transistors were known as germanium triodes or germanium whisker transistors. Two types were produced evolving from prototype coding through the familiar ?G? designation in use for its point-contact diodes and finally adopting RMA registration: ? ? Prototype G Series RMA Amplifier/oscillator SX-4A G11 2N30 Switching Z2 G11A 2N31 Date Up to 1951 1950 on 1952 on ? The prototype numbers appear in early data sheets and in a General Electric price list dated June 1st?1951 in which the new SX-4A and Z2 transistors were priced at a massive $29 each. The two transistors had the same mechanical and electrical characteristics but the switching transistor was tested for ?trigger action? or negative resistance. [General Electric 1950 courtesy Jack Ward] >From 1952 the transistors had 3 pins with the base connection being soldered to the outside of the transistor?s case. See data sheet ECG-3B. Early General Electric G11 and G11A point-contact transistors.[Courtesy Jack Ward] Production General Electric G11 point-contact transistor [Courtesy?Jan de Groot]

6 years, 2 months

d-112 users handbook. Have xtra copy...

by couryhouse＠aol.com

Have xtra copy of. Digital computsr controls inc.? d-112 users handbook offers?????

6 years, 2 months

"itt courier nibble computer" have discovered 2 unpopulated boards ca.1981 there was a,plant in phx.....for IBM cluster terminals....

by couryhouse＠aol.com

"itt courier nibble computer" have discovered 2 unpopulated boards ca.1981? there was a,plant in phx.....for IBM cluster terminals....

6 years, 2 months

International shipping

by jwsmail＠jwsss.com

Any recent or other recommendations on shipping to Europe? Specifically to Italy? I have the packing arranged.? Item being shipped is an ASR33. budget right now is a bit beyond what the buyer has, but I have gotten the unit for him, and we need to figure how to get it there. weight will be 75 to 100#.? Shipping from Los Angeles.? Doesn't necessarily have to go express shipping, as long as the ride isn't too bad. So far not a lot of options, but Fedex freight has been checked out.? Just not sure of any other freight forwarders to use. thanks. Jim

6 years, 2 months

[Simh] Various

by paulkoning＠comcast.net

> On Feb 13, 2020, at 7:35 PM, Timothe Litt <litt at ieee.org> wrote: > > ... > Someone wrote a DECtape driver for VAX - I think Stan R., though it wasn't supported. DECtape controllers are odd devices - the TD10 is reasonably smart, but the others put realtime constraints on the drivers that could be hard to meet. Anyhow, by the time the VAX came out, TU58 and Floppies were cheaper and denser media. TU58, denser perhaps, but vastly less reliable and utterly despised by pretty much everyone at DEC. Also very much slower. I heard that the VMS DECtape driver was by Andy Goldstein. The report also mentioned that it supposedly did "overlapped seek", just as the TOPS-10 driver does, but unlike PDP-11 DECtape drivers. I never saw a system that actually had one, unfortunately. paul

6 years, 2 months

Two Kaypro 2 Computers, Disks, Documents

by stephen.m.pereira.sr＠gmail.com

I have two Kaypro 2 computers, some disks and some documents that I?d like to sell. $250 OBO takes the entire lot.. One of the computers worked the last time I set it up and tried it - a few years ago. The other one had some problem with the disk drives and did not boot, IIRC. If anyone is interested, they are available for local pickup or reasonable drive to a meeting point. I?m in Bedford, NH, just west of Manchester, NH. smp - - - Stephen Pereira Bedford, NH 03110 KB1SXE

6 years, 2 months

Wire list for the RKV11-D Qbus RK05 controller backplane anywhere?

by steven＠malikoff.com

Would anyone know whether there is a backplane wire list diagram anywhere for the RKV11-D Qbus RK05 controller like the one on eBay a few days ago? I didn't get that one but I have a pair of NOS H803 4x dual-height socket blocks kicking around that I guess could be wire wrapped into a replica RKV11 backplane as a rainy day project, not that I have the special module that replaced one of the Unibus boards but I'll keep looking. Info on this controller seems pretty scarce apart from the description in one of the handbooks. Thanks for any help, Steve.

6 years, 2 months

Previous message: Wire list for the RKV11-D Qbus RK05 controller backplane anywhere?

by jnc＠mercury.lcs.mit.edu

> From: Jay Jaeger > Yeah, info does seem to be scarce. Not even in my LEVAX fiche set. My fiche set has the Technical Manual, and also (in the wirelist section) the wirelist. Not sure how to get it to you, though. I stuck it in my industrial-grade scanner at its highest resolution; no go. I suppose I could take photos of it displayed on my fiche reader? Or is there some device I can buy which is less than a zillion dollars which can scan fiche? There are a number of things in my set (e.g. the BA11-N Tech Manual) which aren't online, and would be useful to have. > That fourth card (M7268) is apparently a connector card for the Q-Bus > and drive bus. Yes, but actually there are 6 cards: the M7269 is a dual card which goes into the QBUS backplane, and the M993-YA which goes into the first RK05, to convert from the two flat cables which come from the M7268. > From: Al Kossow > Also, it is only 18 bits. Actually, only 16-bit DMA addresses, I'm pretty sure. Noel

6 years, 2 months

Croemeco 4FDC daughter board...

by wh.sudbrink＠verizon.net

Interesting daughter board on the 4FDC in this ebay lot: https://www.ebay.com/itm/Vintage-Lot-of-2-Cromemco-S-100-Boards-Z80-ZPU-CPU- 4FDC-Floppy-Disk-Controller/202903187221?hash=item2f3df8ef15:g:kGQAAOSwhKZeQ z9C (sorry if you have to paste the URL back together) I thought maybe it was the JVB FDCX4 but after looking at some pictures, it clearly is not. Looks like it just adds a data separator to the 1771? Anybody have one of these? Bill S.

6 years, 2 months

Two Kaypro 2 Computers, Disks, Documents

by stephen.m.pereira.sr＠gmail.com

6 years, 2 months

Fwd: Book on punched cards

by phil＠ultimate.com

As seen on PDP-8 Lovers list: > From: "Jones, Douglas W" <douglas-w-jones at uiowa.edu> > To: PDP8-Lovers <PDP8-Lovers at dbit.com> > Subject: [PDP8-Lovers] Book on punched cards > > A new book has come out that I helped create: > Print Punch > published by CentreCentre, London > 40 pounds sterling for the special edition (print run, 100 books) > 30 pounds sterling for the regular edition (print run, 700 books) > > Here is the publisher's book list: > -- https://centrecentre.co.uk/collections/frontpage > > The book includes 178 images of punched cards from my collection, mostly featuring corporate logos or business forms from around the world. The expensive special edition differs from the regular edition only in: A different color of cover, the addition of a big fat rubber band, and the inclusion of an actual punched card from my stock of spare cards. > > The IBM archives also provided lots of content and there are some essays by others. It's a nice coffee table book, and a good way for me to make the content of my punched card collection more widely available. > > It definitely counts as an art book, not a technical reference, but still, it seems at least tangentially relevant here. > > Doug Jones > jones at cs.uiowa.edu > > PS: They paid me, if you can call it that, with a few copies of the regular edition. I don't expect any royalty checks as a result of the astounding sales bump this e-mail will certainly produce as people rush to buy a useless but pretty book. > > PPS: Yes, if you really want to, you may forward this e-mail anywhere you want. Don't bother asking my permission.

6 years, 2 months

Opening a MicroVAX 2000

by a.carlini＠ntlworld.com

I'm trying to non-destructively open up a MicroVAX 2000. I've removed the bottom "dressing" section (which holds some of the I/O connectors)? but the next step isn't obvious. None of the manuals I have cover dismantling and the net doesn't have an IPB or similar available. Other people have managed to get inside (I can see their results) so I must be missing something obvious ... Thanks. Antonio -- Antonio Carlini antonio at acarlini.com

6 years, 2 months

IBM Type 31 Alphabetical Duplicating Keypunch available, Seattle area

by derschjo＠gmail.com

(resending as this appears to have gotten eaten last time...) Hi all -- As the subject line says I've got an IBM Type 31 Alphabetical Duplicating Keypunch sitting in my basement, in the Seattle area. It's in well-loved but decent physical condition and appears to be completely original. I have not powered it on (still has the original selenium rectifiers in it, for one thing) but mechanically it seems fine. No rust or obviously damaged parts, but it's clearly gotten a decent amount of use since the 1930s. It's really cool but it's not really something I'm interested in keeping -- if any of you are interested or know someone who is interested, please feel free to make an offer. Due to the size and fragility of the item I don't want to ship this thing. Pictures are available here: https://1drv.ms/u/s!Aqb36sqnCIfMo9BhHMhAok3F4cAInQ?e=EhXDPP Thanks! Josh

6 years, 2 months

cctech Digest, Vol 65, Issue 3

by syseng＠gfsys.co.uk

On 02/11/20 18:00, cctech-request at classiccmp.org wrote: > Send cctech mailing list submissions to > cctech at classiccmp.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://www.classiccmp.org/mailman/listinfo/cctech > or, via email, send a message with subject or body 'help' to > cctech-request at classiccmp.org > > You can reach the person managing the list at > cctech-owner at classiccmp.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of cctech digest..." > > > Today's Topics: > > 1. looking for: fairchild model 8200 manual (Adrian Stoness) > 2. Opening a MicroVAX 2000 (Antonio Carlini) > 3. RD53 failure modes (Carlos E Murillo-Sanchez) > 4. PC3XC manual? (Paul Koning) > 5. Re: Old IBM magnetic media (cctalk at emailtoilet.com) > 6. Looking for info - Computer Extension systems WE-VM8E8 board > (Bob Smith) > 7. Re: RD53 failure modes (Fred Cisin) > 8. IBM Type 31 Alphabetical Duplicating Keypunch available, > Seattle area (Josh Dersch) > 9. Re: IBM Type 31 Alphabetical Duplicating Keypunch available, > Seattle area (William Donzelli) > 10. Re: IBM Type 31 Alphabetical Duplicating Keypunch available, > Seattle area (Tony Aiuto) > 11. Re: IBM Type 31 Alphabetical Duplicating Keypunch available, > Seattle area (Lyle Bickley) > 12. Making use of Panda dist TOPS20 (David Griffith) > 13. Re: Making use of Panda dist TOPS20 (Ethan Dicks) > 14. Re: Opening a MicroVAX 2000 (Josh Dersch) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 8 Feb 2020 18:50:25 -0600 > From: Adrian Stoness<tdk.knight at gmail.com> > To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk at classiccmp.org> > Subject: looking for: fairchild model 8200 manual > Message-ID: > <CAA3rs201WpX8iERnhTYv1EKksaR8-UTTHAPeTE6S1FieNY6N7Q at mail.gmail.com> > Content-Type: text/plain; charset="UTF-8" > > trying to find a manual for a fairchild universal counter timer model 8200 > circa 1968? > > got one i found like to see if i can get it working for the rack. > > can only find this sales catilog from 68 > https://l.facebook.com/l.php?u=https%3A%2F%2Farchive.org%2Fdetails%2FTNM_In… > > https://l.facebook.com/l.php?u=https%3A%2F%2Fdrive.google.com%2Fopen%3Fid%3… > > https://l.facebook.com/l.php?u=https%3A%2F%2Fdrive.google.com%2Fopen%3Fid%3… > > hasnt been powered up since prolly 1986 has a tag on it about channel B not > working. > was found in a rack sitting out in 40below temps prolly been sitting there > for 20-30yrs in a storage shed the guts are realy clean on it so proly has > potential to get working again. > > > ------------------------------ > > Message: 2 > Date: Mon, 10 Feb 2020 11:17:03 +0000 > From: Antonio Carlini<a.carlini at ntlworld.com> > To: "General Discussion: On-Topic Posts"<cctech at classiccmp.org> > Subject: Opening a MicroVAX 2000 > Message-ID:<7d2cf42b-03c1-b514-d8aa-b85c0af83695 at ntlworld.com> > Content-Type: text/plain; charset=utf-8; format=flowed > > I'm trying to non-destructively open up a MicroVAX 2000. > > > I've removed the bottom "dressing" section (which holds some of the I/O > connectors)? but the next step isn't obvious. None of the manuals I have > cover dismantling and the net doesn't have an IPB or similar available. > Other people have managed to get inside (I can see their results) so I > must be missing something obvious ... > > > Thanks. > > > Antonio > > Antonio, From memory, the 2000 case covers are really tight and may need a bit of leverage to remove, assuming all the screws have been removed. Very close fitting rfi shields + several years of light corrosion etc... Regards, Chris

6 years, 2 months

Re message 5 on Tuesday the 12th of February "Old IBM magnetic media" - 2321 etc...

by peter＠vanpeborgh.eu

Sir, I have a great interest in collecting vintage media. I am also desperate to get hold of 2321 artifacts. Please talk to me as soon as you can. Many thanks, Peter VP

6 years, 2 months

RD53 failure modes

by shadoooo＠gmail.com

Hello, definitely you should be able to fix it. This kind of problem is caused by the missing thickness of the rubber stoppers of the positioner, which became goo in the years. You have two ways to solve this problem. First of all, remove the disk top cover plate in clean room, locate the positioner and note that is full of black goo. Remove it at best with isopropyl alcohol, sticks, paper, whatever, but be SURE not to spurt / touch on the disk surface. After this: - method 1, easier: locate two screws at the sides of the positioner coil which hold on position left and right stoppers. You should loosen the left one (head on the center of the disk) and move just slightly to the right, then tight the screw again. As you must repeat some times to find the right position, my advice is to have a PSU connected to the disk, and try before really tightening the screw if it is enough / too much / good. In this way you compensate for the thickness of the missing rubber stopper, but the head will receive some more shocks at start and during operations. -method 2: you will replace the missing rubber with a new one. You should find a piece of rubber sheet, thickness around 1mm. You cut a small chunk and somehow glue it to the stoppers again. Of course you need to clean it very well before, otherwise glue will not adhere. Let me know if you manage to fix it. Andrea

6 years, 2 months

Making use of Panda dist TOPS20

by dave＠661.org

I'm trying to wrap my head around getting Mark Crispin's Panda Distribution of TOPS20 set up such that I can actually make use of a TOPS20 environment. I keep finding lots of manuals through Google searches, but I'm missing a few critical things. Things that are evading me are as follows: 1) How do I get networking set up, preferably such that it'll work on a host that's given a DHCP address that could vary? I'd like to be able to ssh to a specific port and then be connected to a terminal on the emulated machine. 2) How do I set or alter a regular user's disk quota? -- David Griffith dave at 661.org A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

6 years, 2 months

test

by jwest＠classiccmp.org

test

6 years, 2 months

Old IBM magnetic media

by cctalk＠emailtoilet.com

I had an old IRA 7340 Hypertape cartridge. It is at the Computer Museum of America. I still have a cartridge but don't know from where. I just got some replacement strips for a 2321 Data Cell.

6 years, 2 months

another test

by jwest＠classiccmp.org

6 years, 2 months

looking for: fairchild model 8200 manual

by tdk.knight＠gmail.com

trying to find a manual for a fairchild universal counter timer model 8200 circa 1968? got one i found like to see if i can get it working for the rack. can only find this sales catilog from 68 https://l.facebook.com/l.php?u=https%3A%2F%2Farchive.org%2Fdetails%2FTNM_In… https://l.facebook.com/l.php?u=https%3A%2F%2Fdrive.google.com%2Fopen%3Fid%3… https://l.facebook.com/l.php?u=https%3A%2F%2Fdrive.google.com%2Fopen%3Fid%3… hasnt been powered up since prolly 1986 has a tag on it about channel B not working. was found in a rack sitting out in 40below temps prolly been sitting there for 20-30yrs in a storage shed the guts are realy clean on it so proly has potential to get working again.

6 years, 2 months

PC3XC manual?

by paulkoning＠comcast.net

My Pro has a PC3XC 4-line serial interface, and I know I once had a manual for it because the driver code I wrote mentions it. But I can't find it -- it may have been lost or it may have been a DEC document I did not take with me. Is there a PC3XC-BA programming manual anywhere? paul

6 years, 2 months

Looking for info - Computer Extension systems WE-VM8E8 board

by bobsmithofd＠gmail.com

I have 3 of these omnibus boards, all fully populated with 8K 12 bit words of 2102 static ram. What I don't have is the documentation that describes the way the jumpers need to be set up for each 8K field. The set up seems to involves what looks like a 3 parallel 8 pin sockets that look like one and a half 16 pin DIP socket. Any hints or pointers toward docs would be greatly appreciated THanks bob

6 years, 2 months

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