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In search of microchannel P390 card...

by ian.finder＠gmail.com

If you have a lead on one, please ping me off-list. I have a very specific project I'm trying to accomplish. thanks

7 years, 11 months

ISO 70's and 80's coax and twinax terminal docs/brochures

by evanlinwood＠hotmail.com

> I've started to more aggressively archive material on old IBM and compatible coax and twinax I'm not sure if this helps - they seem like they may be in the disposal chain though, might possibly be able to grab manuals if they come up? http://www.a1usedcomputers.com.au/shop/prodList.asp?idCategory=256

7 years, 11 months

Looking for two DEC H445 power bricks for PDP 11/40 project

by jnc＠mercury.lcs.mit.edu

> From: Pierre Gebhardt > As I don't have core memory modules available, I thought of using MS11 > memory, which, according to my research, seems to be an option for > 11/40 systems. Err, which kind of MS11? There are lots of different ones: http://gunkies.org/wiki/MS11 and they don't all work in every UNIBUS PDP-11! Your options are the -E/-J group, and the -L, but the latter are a bit hard to find, and expensive. (There may be non-DEC equivalents, but I don't know about them.) They all need a MUD backplane such as the DD11-C or DD11-D. (IIRC, the -M has a 'UNIBUS' jumper, but the card uses non-standard voltages on the backplane; 12V instead of 15V, IIRC.) > Does that mean that a single H745 regulator might be sufficient for my > needs? If you're not using a lot of MM11-L, you would definitely only need one H745, no matter what configuration you have. (Note that if you have an old machine/harness, there's a jumper you have to add if you have only a single H745; see the second paragraph on page 6-18 of DEC-11-H40SA-B-D.) Noel

7 years, 11 months

Apple LaserWriter paper trays

by ball.of.john＠gmail.com

With VCF: PNW six months away I want to try and get something together to make a presence. I am not aware of anyone demonstrating an entire fleet of Apple machines in a configuration as advertised as "The Macintosh Office" at any recent point in history so I thought I should dedicate a table or two to that. A quick inventory tells me I can totally get multiple compact macs, a Macintosh XL, an IBM XT and a netbooting Apple IIe going with a set of common office programs and networked together with a server running Appleshare so that people can play with the software and try a few games over the network. The key component however is I need to get a LaserWriter working and networked as well so people who play with MacPaint for example can print their art out. I have access to four or five printers, of which one will come up reliably and make a presentable attempt of dispensing toner and not leafing roller sludge everywhere however while I can find cassette trays for holding paper I cannot find the two brown paper trays that attached to either side of the printer. I see quite a few on google that are also missing the trays. Would calling them uncommon be correct or might someone have a set they would be willing to part with? -John

7 years, 11 months

The Ultimate Apollo Guidance Computer Talk

by lproven＠gmail.com

Amazingly detailed 1hr talk about the Apollo Guidance Computer. It's stunning how much they got into mid-1960s technology: 1 MHz hand-made processor, 1 k of RAM, 4 k of ROM, and bank-switching, with a fault-tolerant multitasking OS with an interpreted metalanguage. Absolutely stunning. https://media.ccc.de/v/34c3-9064-the_ultimate_apollo_guidance_computer_talk -- Liam Proven - Profile: https://about.me/liamproven Email: lproven at cix.co.uk - Google Mail/Hangouts/Plus: lproven at gmail.com Twitter/Facebook/Flickr: lproven - Skype/LinkedIn: liamproven UK: +44 7939-087884 - ?R (+ WhatsApp/Telegram/Signal): +420 702 829 053

7 years, 11 months

ISO 70's and 80's coax and twinax terminal docs/brochures

by aek＠bitsavers.org

I've started to more aggressively archive material on old IBM and compatible coax and twinax terminals and was wondering if anyone has documentation scanned or squirreled away that I don't already have on bitsavers. Most of these have been scrapped by now, and surviving keyboards for them are going for the high hundreds of dollars now, even from companies like Telex or Memorex. I started surveying what we have in the CHM collection and about half of them have no keyboards :-( This is a drag. Terminals from the PC era forward seem to be in a little better state since many appear to have adopted some flavor of 5 pin DIN interface. There are some new pictures of a few Telex coax terminals up now under http://bitsavers.org/pdf/telex/terminal and I started trying to restore a 276-12 with integrated establishment controller that I'm going to have to find a keyboard for. Maybe Cindy knows of someone who has some more old Telex Microswitch keyboards.

7 years, 11 months

Looking for two DEC H445 power bricks for PDP 11/40 project

by jnc＠mercury.lcs.mit.edu

> From: Henk Gooijen > As far as I know, the 11/40 uses only one H745. Depends on what kind of memory it has. If MF11-L, it has two H745's; if MM11-U, it has an H745 and an H754. (The harness has two different connectors for the 5th 'brick', so it can handle either kind. At least, that's the situation on the later machines [serial numbers above 6000]; early production /40's only support the MF11-L, and you have to use special add-on harnesses to support an MF11-U in them; see DEC-11-H40SA-B-D, Chapter 6 for the details.) Noel

7 years, 11 months

The Ultimate Apollo Guidance Computer Talk

by jnc＠mercury.lcs.mit.edu

> From: Cory Heisterkamp > I can also highly recommend the book 'Digital Apollo' Yes, it's quite good. Two other good books about the AGC are: Eldon Hall, "Journey to the Moon" which is by a guy who was one of the managers on the project. The book is anything but a 'management history', though (unlike too many 'technical histories', like the Smith/Redmond Whirlwind history, which I was just looking at). The book is a _technical_ history - the engineering is front and center, and management decisions are on the periphery, for background. There's also: Hugh Blair-Smith, "Left Brains for the Right Stuff" which is by someone who was an engineer on the project - he did work on the CPU architecture, and also some software. The book is a mix of personal experiences, and an overall history of the moon race. Noel

7 years, 11 months

I finally got to see a LMI Lambda in real life...

by dseagrav＠lunar-tokyo.net

Two of them in fact, and a CADR - In my garage, no less! The Lambdas are in bad shape, and the CADR is in very bad shape and missing its console and disk. It?s going to take awhile to get them cleaned up and see how viable they are. On the plus side, I got a some spares and debugging equipment, and I have a working PDP-11 to debug the CADR with if it gets that far, so there?s a good chance I should be able to get at least one working. I?ll post more as things develop.

7 years, 11 months

SAGE memory plane

by aek＠bitsavers.org

ebay https://www.ebay.com/itm/232927847019 https://secretsofcoldwarradar.omeka.net/exhibits/show/cold-war-radar-techno… can someone identify exactly what this box was called, when it was deployed, and what training manual they are referring to? we have a couple http://www.computerhistory.org/collections/catalog/102633198 and they keep getting mis-identified.

7 years, 11 months

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