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101090 discussions

Fan bearing lubricant was Re: WD-40 (again)

by jnc＠mercury.lcs.mit.edu

> From: drlegendre > There are so many types, sources & grades of lubricating oil out there, > it boggles the best of minds. Speaking of lubricating oils... I've recently been cleaning/etc some of the ~4" boxer fans that the earlier PDP-11's use in large quantities. Some of the IMC fans (sleeve bearing) in the machine didn't really want to turn; on taking them apart, they were absolutely full of dirt, and when cleaned, spun up nicely. However.. what lubricant should I use on them before putting them back together for the long term? I assume I should use _something_? But the machine's going to be sitting a fair amount, so I don't want something that will dry out and/or gum up. What do people recommend? Would a 20SAE oil, as used on small electric motors, be OK, or is that in danger of turning into gummy stuff if left sitting for too long? Is there e.g. some silione-based stuff which is long-term capable? Thanks in advance for any/all advice! Noel

9 years, 7 months

Needed - servicemanual for NCR PC4i

by fritz_chwolka＠t-online.de

Hello, I got 2 x NCR PC4i computers. One is running fine at the moment but the harddisk has some problems. The 2nd one had a dead CPU and Bios rom. I replace both but got no beep and nothing on the screen. The PC4i has a 'rack case' for the motherboard. Changing the case shows the same problem. There maybe a problem with the power supply. Does anyone have a service manual or other manuals for the NCR PC4i ? Here is what I have: http://oldcomputers.dyndns.org/public/pub/rechner/ncr/PC4i/index.html -- Thanks - greetings Mit freundlichen Gr??en Fritz Chwolka

9 years, 7 months

wanted - M8650/M8655 async card

by Mark＠Misty.com

Hi, After meeting up with Kyle Owen at VCF-East today, and booting OS8 via OS/8 Disk Server on his system, I have renewed interest in getting my pdp-8/e more functional. Does anyone have an extra M8650 (KL8E) or M8655 (KL8JA) asynchronous interface card they would be interested in selling or bartering? Mark -- Mark G. Thomas (Mark at Misty.com), KC3DRE

9 years, 7 months

In search of VAX 750 front door and CPU spares.

by ian.finder＠gmail.com

Please let me know if you know of any. Picked up a 750 today, and will be making a trip to Calgary in a few months for another... Sent from Outlook for iPhone<https://aka.ms/wp8k5y>

9 years, 7 months

Manual for DEC 433au

by glen.slick＠gmail.com

On Apr 16, 2016 5:44 AM, "Robert Jarratt" <robert.jarratt at ntlworld.com> wrote: > > Anyone got the following document: DIGITAL Personal Workstation System > Reference and Maintenance Guide > > The link on Manx is broken. What page are you looking at on Manx which has the broken link? Do you have the part number for the manual? That title is a rather generic one to use for searching.

9 years, 7 months

KY11-LB drawing error

by jnc＠mercury.lcs.mit.edu

So, now that I have the 85S68 datasheet in hand, it turns out there's an error in the KY11-LB drawings. (I just couldn't understand how the circuit could possibly work, until I discovered that!) On the two RAM chips (E11 and E27, used to hold the bus address, keypad data, etc) the "Output Store" and "Output Disable" labels are reversed. (Not the pin numbers, etc - just the labels.) I.e. 'Output Store' is actually pin 13; it is tied high (as shown on the drawings for that pin). I have 'fixed' a copy of that page from the print set, and will (soon) issue an updated PDF. Noel

9 years, 7 months

Servicing DEC-T11 based products with a Fluke pod?

by johnwallace4＠yahoo.co.uk

Hi John, In the apparent absence of other T11-related suggestions, are you aware that there are a couple of T11-related manuals on Bitsavers, at least one of which has schematics? There's the T11 Users Manual, and the T11 Evaluation Module Users Guide: www.bitsavers.org/pdf/dec/pdp11/t11/ Nothing about Fluke pods, but maybe something more than you have at the moment? Best of luck John Wallace

9 years, 7 months

DECnet TRN Datalink spec, etc.

by mouse＠Rodents-Montreal.ORG

>> While looking for DECnet documents, [...] > As the primary author of that document, I still have a hard copy > (available), and can answer any questions (if the neurons remember) And this sort of thing (original document authors' presence) is a substantial chunk of why I think this list is awesome. /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML mouse at rodents-montreal.org / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B

9 years, 7 months

Need 85S68 datasheet

by jnc＠mercury.lcs.mit.edu

> Does anyone have an 85S68 (16x4 SRAM) datasheet? I've looked online, > can't find one. Ooops, never mind; found one under DM85S68N (sigh, clearly not very awake yet...) Noel

9 years, 7 months

Need 85S68 datasheet

by jnc＠mercury.lcs.mit.edu

Does anyone have an 85S68 (16x4 SRAM) datasheet? I've looked online, can't find one. Thanks in advance! Noel

9 years, 7 months

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