test-drb September 2021

test-drb@ccmp.vtda.org

125 participants
76 discussions

by cz＠alembic.crystel.com

Quick question: I've been cleaning out and repairing an HP5061 supply for a 1000 computer. However I didn't take a picture of the 4 boards when I pulled them and I want to make sure they go in the right places. From the manual (page 99 of 92851-90001_Sections-IXB_Mar-1981.pdf) the slots are labeled A6-J1 through A6-J5. Does this mean that: J1 is the J5 is the control board (A3A5) J4 is a jumper board for +12 adjustments J3 is unused (battery backup boards) J2 is the inverter board (A3A2) J1 is the pre-regulator board (A3A1) Seems right but I know how bad things can go :-) Thanks! C

3 years, 3 months

[FTGH] DEC Professional magazine, 32 issues, 1988-1990

by toby＠telegraphics.com.au

Hi, If anyone is interested, these are available for cost of postage from Toronto Canada. I will post selected sets but if someone wants the lot, be quick. First come, first served... https://imgur.com/MggLbvQ --Toby

3 years, 3 months

Sun keyboard and mouse new in box on shopgoodwill

by bob099＠centurytel.net

https://www.shopgoodwill.com/Item/129829234

3 years, 3 months

Wanted: Sun Sparcstation Classic/LX PS Fan

by knowak＠alumni.calpoly.edu

Hi All, Does anyone by chance have a collection of fans? The one in my Sun Sparc Classic died and I am having a hard time finding a replacement with the same specs. Or can anyone recommend a good source? It's a Nidec BetaV, TA225DC, Model M33402-55 Thanks! -Kurt

3 years, 3 months

DEC BA11-K noisy fans

by fritzm＠fritzm.org

Hi all, I've been working on a BA11-K PDP-11/34 lately, and wow it sure is a noisy thing... On my '11/45, the "Boxer" fans were easily disassembled via a cir-clip, and could then have their bearings cleaned/relubed (or worst case replaced). Fan maintenance quieted down the /45 a good bit. But these larger 6" Amphenol units don't look quite as easy to get in to... Is the plastic rotor on these just a press fit? Any tricks to getting in there for maintenance? Or are these "you have what you have" and the only option if unsatisfied with their current performance to replace them entirely? cheers, --FritzM.

3 years, 3 months

Archiving classic computer rubber part information

by aek＠bitsavers.org

I've been having fun this past week trying to get the mechanics of a Canon CX print engine in a LaserWriter restored. The paper pick and separation rollers have turned to goo. This got me thinking that people need to start collecting information on rubber parts, like dimensions, material and durometer values for all of these parts before they fail. I found nothing on line about making replacement parts for these. No one stocks replacement parts for anything older than a Canon SX engine (the generation after the CX). Another problem child are Datamation card readers. It's been 20 years now since the last ones were pulled out of service after the 2000 election and there seems to be a steady stream of people trying to make replacements. I think the CHM 1401 guys replaced theirs a few years ago, don't know if they collected mechanical info or where the repair units were made. I've also heard that Terry of Terry's Rubber Rollers is recovering from Covid, and a frequently used place that refurbished typewriter platens has gone out of business. People have suggested https://www.jjshort.com/Recovered-Rubber-Rollers.php as an alternative.

3 years, 3 months

Scanning Suggestions (Bookmarks & Colour)

by paul＠frixxon.co.uk

With apologies for breaking the threading, as I've just rejoined and I'm responding to something I've just spotted in the archive ... Regarding colour separations for scanned documents, GraphicsMagick is quite capable of producing the required individual colour layers. If you identify the colours you wish to pull out, you can use the "-fuzz" and "-opaque" operators to change any given colour range (fuzz uses Euclidean distance in RGB space) into another one (the current "-fill" colour). I haven't finished writing this up, but my workflow tends to be to produce a Group4 TIFF from the colour scan by simple thresholding (or first dropping the other colours to white, if they are quite dark), and then produce all the other separations by dropping black out, converting your spot colour to black and then thresholding. This way you get two or more images: 1) PNG(s) containing pixels that are all either white or your spot colour, 2) a G4 TIFF for the black and white layer. The PNG must be saved as a two-colour paletted image so that they can be used as masks in the final PDF. I always apply the black and white (text) layer on top of every page, so that the fuzzing of the colour layers doesn't reduce the clarity of the text. This might sound awkward, but I've found that one fuzz value tends to work for all the pages when extracting a given colour, so you can process all pages in a loop. I use the Perl module PDF::Builder to put my scans together, but I think tumble is capable of overlays too. PNGs are compressed with deflate. If the spot colours you are processing apply to text in the document, my first thought was that I could save a bunch of Group4 TIFFs, one for each colour, and mask those into the PDF, because Group4 compression is impressive for text. It took some frustrating experiments before realising the Group4 compression isn't defined for two colour images in general; it is specifically for images that are black and white, and PDF won't let you circumvent that! I've just scanned another document with some blue diagrams and table backgrounds, if you'd like to see an example: https://vt100.net/dec/ek-0la75-ug-002.pdf I might reprocess this later, but for now, I didn't even bother separating out pages that contain blue from ones that don't; every page has a blue layer, even if it's blank. If you're wide awake, you may spot that the blue layer on page 41 doesn't extend to the bottom of the table. This isn't a processing flaw; the document is actually printed like that. Regards, Paul

3 years, 3 months

FYI: NDWiki - planned downtime

by tingox＠gmail.com

Bitraf[1] is moving, and the NDwiki[2] server moves with it. The move starts Saturday September 11th 2021 at 12:00 hours local time, and is expected to be completed sometime before midnight. References: 1) https://bitraf.no/ 2) http://www.ndwiki.org/ -- Regards, Torfinn Ingolfsen

3 years, 3 months

vcfmw

by useddec＠gmail.com

Due to health problems I won't be able to attend vcfmw this year. I live just outside Champaign, IL, I-57 & I-74, about 2 hours south of I-80, and 2 hours west of INDY. If anyone is interested in l buying anything I should be home a few days before, during and after WCFMW. Please email me with the time and day you would like to stop, and what you are interested in seeing/buying. I hoped to hang on to most things for a while, but I'm afraid I'm going to start letting loose more and more. Thanks, Paul I'm located just outside Champaign, IL, I-57 & I-74

3 years, 3 months

Museum of pinball goes to auction this weekend

by barythrin＠gmail.com

Incase anyone hadn't heard or has interest, a lot of arcades will be on the market for bidding this weekend. Sad but inevitable. Hopefully it's not all reseller prices and can get into the hands of some other museums and collectors. https://www.nbclosangeles.com/news/local/arcade-games-auction-museum-of-pin…

3 years, 3 months

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test-drb September 2021