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Free to a good home: Honeywell/Bull DPS-6 workstation / server (Seattle, WA)

by kevinowens1＠gmail.com

do you still have this ? thanks Kevin

8 years, 8 months

3D scans and sounds

by lars＠nocrew.org

Hello, I'm grateful that there are plenty of pictures of classic computer. However, I want more. 3D scans and sound recordings. Has anyone attempted to do that?

8 years, 8 months

LGP-Resto Update

by coryheisterkamp＠gmail.com

For those curious about the status of the LGP-30 restoration, I?ve got a blog up with the latest. http://radar58.com/LGP30/ The power supplies are stable, the blower unit was overhauled and new bearings installed, all the modules have been recapped. I had a noisy bearing in the memory drum, thankfully it was one that could be accessed through the pulley end and I was able to inject fresh grease. There were burnt contacts in one of the open frame relays in the sequencer unit leading to intermittents. I found a NOS 3-pole version with fresh contacts and transferred those over yesterday and we now have correct startup. The ?digital display? chassis has been worked over with fresh resistors and this has made the controls much more responsive. The Flexowriter is behaving and the 6 associated FF's in the machine respond to keystrokes. All-told, I?m at the point of troubleshooting the scope display- I have a sad, unintelligible, wavy line, but I believe retrace is derived from the system clock track on the drum, so that?s my next investigation. Both vertical and horizontal boards have been rebuilt and tubes substituted with no change. -C

8 years, 8 months

New batch of pdp8 OMNIBUS to USB interface! Please Read and react!

by jnc＠mercury.lcs.mit.edu

> From: Jon Elson Dave Bridgham and I have been using KiCAD for our stuff, and we're pretty happy with it. Here are a few bits: this is just data, I'm not trying to convince anyone to use it - the points about 'complex tools one is already very used to' are very good ones. > I'm most concerned about the reliability of the design rules check > ... > If these checks miss errors, I REALLY don't want to use the package. I'm not quite sure what's covered here, but I have used the checker on my admittedly-tiny projects, and been happy with it. > and layout vs. schematic. Again, Dave has used it to lay out at least one moderately-sized card, and seems to have been happy with the results. > (KiCad seems to still require picking operations from a menu, Protel > has user-configurable keyboard shortcuts that are a big help. Maybe > KiCad has that and I just need to learn them.) KiCAD does have keyboard shortcuts. I don't know if they are configurable. > From: Guy Sotomayor Jr > In terms of community supplied libraries, Eagle has those too and I've > found that by and large they are junk (it's easier/quicker for me to > create a part on my own > ... While I haven't seen a lot of KiCAD contributed libraries (that's > part of the problem) KiCAD came with a fairly large set of user-contributed libraries. For various reasons (including working with archaic parts), I've wound up adding quite a few, but i've usally found it pretty easy to modify an exising part from the libraries, to get what I need. YMMV. Noel

8 years, 8 months

ISO IBM 3278 keyboards

by ggs＠shiresoft.com

Hi, I recently acquired a couple of IBM 3278 terminals (finally!). They are complete and working when shipped. I haven?t powered them up yet?I need to check them out but other than some slight screen burn they?re complete and very clean. However, they came with data entry keyboards. I?d really like to find one or more typewriter keyboards for 3278?s. If anyone knows where some might be pried loose, I?d appreciate it. I?m willing to trade or pay $$?s. Thanks. TTFN - Guy

8 years, 8 months

Error in PDP-12 Prints, and maybe all PDP-12s.

by michael.99.thompson＠gmail.com

While debugging the PDP-12 at the RICM we found a mistake on sheet TC12-0-LTR in the PDP-12 schematics. The pins on the data cable between the TU56 and the TC12 labeled BT2 and FT2 should be BL2 and FL2. DEC wired the TC12 backplane per the incorrect schematic and grounded pin F06T2 instead of F06L2. The W032 on the end of the data cable has nothing connected to pin T, so this leaves the TC12 end of the Triax cable shield for data track 3 ungrounded. Data track 3 is the one on which we are having a noise problem, so this is a promising discovery. The 1969 and 1972 PDP-12 Engineering Drawings both have the same revision sheet TC12-0-LTR and the same error. Maybe all PDP-12s have this wiring error? -- Michael Thompson

8 years, 8 months

PDF PDF Which is right and which is ... Was Re: PDP-11/24 CPU later version

by COURYHOUSE＠aol.com

well I save the tiff because that's what archivists do generally I end up using the jpeg to make picture from. or post to net! In a message dated 2/19/2017 4:25:48 P.M. US Mountain Standard Time, toby at telegraphics.com.au writes: On 2017-02-19 3:50 PM, COURYHOUSE at aol.com wrote: > When we scan stuff at SMECC > it is saved in the following 3 formats for each item scanned. > > PDF with ocr background > TIFF > JPEG > and if containing a lot of text a TXT file as well. > > Kind of a shotgun approach... but should stand test of time? Only if you're publishing it somewhere and many people are mirroring it. --Toby > > Ed# _www.smecc.org_ (http://www.smecc.org) > > > > In a message dated 2/19/2017 1:44:52 P.M. US Mountain Standard Time, > jnc at mercury.lcs.mit.edu writes: > >> From: Toby Thain > >> Often the source material is a multipage TIFF from the scanner or other >> processing step. > > Multiple single-page TIFFs, in my case. > >> So relevant tools are things like tiff2pdf (tiffutils) > > But also JPEG's, for pages where the B+W scanning I use (with fax > compression > to keep the file size down) results in pages that aren't readable - this > happens on faded pages. Does tiff2pdf handle a bunch of single-page > TIFF's, with a JPEG or two throw in? > > Noel > >

8 years, 8 months

Wanted: Amiga 1000 hard drive

by tosteve＠yahoo.com

Anyone have an Amiga 1000 hard drive that they want to sell?

8 years, 8 months

PDF PDF Which is right and which is ... Was Re: PDP-11/24 CPU later version

by COURYHOUSE＠aol.com

When we scan stuff at SMECC it is saved in the following 3 formats for each item scanned. PDF with ocr background TIFF JPEG and if containing a lot of text a TXT file as well. Kind of a shotgun approach... but should stand test of time? Ed# _www.smecc.org_ (http://www.smecc.org) In a message dated 2/19/2017 1:44:52 P.M. US Mountain Standard Time, jnc at mercury.lcs.mit.edu writes: > From: Toby Thain > Often the source material is a multipage TIFF from the scanner or other > processing step. Multiple single-page TIFFs, in my case. > So relevant tools are things like tiff2pdf (tiffutils) But also JPEG's, for pages where the B+W scanning I use (with fax compression to keep the file size down) results in pages that aren't readable - this happens on faded pages. Does tiff2pdf handle a bunch of single-page TIFF's, with a JPEG or two throw in? Noel

8 years, 8 months

PDF PDF Which is right and which is ... Was Re: PDP-11/24 CPU later version

by jnc＠mercury.lcs.mit.edu

> From: Toby Thain > Often the source material is a multipage TIFF from the scanner or other > processing step. Multiple single-page TIFFs, in my case. > So relevant tools are things like tiff2pdf (tiffutils) But also JPEG's, for pages where the B+W scanning I use (with fax compression to keep the file size down) results in pages that aren't readable - this happens on faded pages. Does tiff2pdf handle a bunch of single-page TIFF's, with a JPEG or two throw in? Noel

8 years, 8 months

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