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101090 discussions

Wanted: Tektronix 401x keycaps/keyboard (+ 4051 keycap)

by legalize＠xmission.com

I have a 4010 that is missing the keys '1', '3' and 'ESC'. The '1' key has a chipped mounting post for the keycap as well. I'm looking for replacement keycaps and/or a replacement keyboard. I also have a 4051 that is missing a single key off the numeric keypad on the right. It is labelled 'ENTER EXP'. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

17 years, 5 months

PDP-8/E H724 power supply and serial interface

by pete＠dunnington.plus.com

I've taken my newly-acquired PDP-8/E apart to clean out the dust and disintegrated foam, but I've not powered it up yet. (In fact it's still in pieces while I sort out the foam). I'll be checking the capacitors before I go much further. Part of the reason for not powering it up is that it's a 110V version, and here in the UK my mains is 240V. Looking at the engineering drawings (on David Gesswein's site, and Highgate) for the H724 (110V) and H724A (240V) supplies, I see transformer taps shown for both voltages, and on the face of it, it should be very easy to convert. Just a matter of moving the connections from tags 6 and 9 of the relay (or "realy" as the schematic calls it :-)) Has anyone ever done this? Another question: There are four 1N4721 rectifier diodes used for the +8V and +15V supplies (two pairs for two full-wave rectified supplies). Someone before me has disconnected one end of one of them. Usually that's because it's gone short, but my meter says this one is OK. Any ideas why? I'm also lacking any serial interface for this machine. I do have some other spare boards; is anyone (especially in the UK) interested in a trade? -- Pete Peter Turnbull Network Manager University of York

17 years, 5 months

keypunch equip on govliquidation

by roger.holmes＠microspot.co.uk

From: Richard <legalize at xmission.com> > Subject: Re: keypunch equip on govliquidation > To: "General Discussion: On-Topic and Off-Topic Posts" > > In article <112020081326.28067.49256593000ACD3500006DA322218865869B0A02D29B9B0EBF9D0A050E039A089C at att.net > >, > shumaker at att.net writes: > >> large govliquidation lot auction opened today has two types of >> keypunch consoles > , one of which seems to be unused IBM equip. Photo shows it even > has some docum > entation. >> >> http://cgi.govliquidation.com/auction/view? >> id=2037010&categoryId=c7149 >> > > That looks like the kind of keypunch we had at the University of > Delaware > around 1979/1980. I remember using them to duplicate punched cards > just > for the purpose of making confetti :). The earlier pictures are .029 keypunches which look to be in great conditions. The next to last picture looks like a .026 keypunch but seems to have suffered a bit, but still good for spares. If only they weren't the wrong side of the Atlantic or cost a bit less to ship. Are they really saying the keypunches only cost them 100 dollars each new (400 for 4 and 200 for 2)?

17 years, 5 months

Seeking Proteon P4100+ router manuals

by james＠jdfogg.com

> >> I'm guessing Proteon was an independent company until > DEC bought >> them at some point? > > > >Did DEC ever buy Proteon? I was with DEC's network group > (NAC) >when we bought the rights to the Proteon code base > (or at least >some of it). > > That's how I remember it too. I was involved in that > handoff at the time. > > I may have left before it came to fruition, but I don't > remember that anything ever came of this. In other words, > DEC paid Proteon $1M or so, got a pile of source code, and > nothing was done with it. At some point Proteon became part of Ascend.

17 years, 5 months

Seeking Proteon P4100+ router manuals

by sellam＠vintagetech.com

I'm looking for a set of manuals for the Proteon P4100/P4100+/P4200 routers, circa 1989 or earlier. I'm guessing Proteon was an independent company until DEC bought them at some point? Just guessing. Anyway, if you've got a set of manuals I'd be interested in purchasing them from you. Please contact me directly if you have some. Thanks! -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

17 years, 5 months

Nicolet manuals and software

by chrish＠precisionmetrology.com

Mr. Joe R., I am a manager for a calibration company and ran across your web page stating that you have several old Nicolet manuals. When I clicked on your link for them it told me that this was an invalid link. I am curious if you have a manual for a Nicolet Integra 20 Oscilloscope. I am looking for calibration information and having a hard time finding it online due to the age of this equipment. Can you help me out? My Regards, Chris Henley Lab Manager Precision Metrology, Inc. Phone: (414) 351-7420 Fax: (414) 351-7429 chrish at precisionmetrology.com

17 years, 5 months

computer graphics in the 1950s

by legalize＠xmission.com

What was the first machine to have some sort of graphical display (most likely oscilloscope style) driven by a computer? SAGE is the first one I can think of; I don't recall the predecessors at MIT having any sort of graphical display. Then, after the first machine, besides SAGE, what systems were utilizing graphic displays in the 1950s? Did the IBM commercial derivative of SAGE use any graphic displays? -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

17 years, 5 months

anybody have any IBM 8525's?

by jlobocki＠gmail.com

hello, Im trying to find one of those all-in-one PS/2 computers that IBM had in the late 80s, some were under the "EDUQUEST" badging, but most were the all-in-one 8525, and for some reason those who are selling on ebay think they have one of the rarest machines in the world and charge as so, and it really makes me regret not grabbing one from the salvage pile when they dumped all the ones in 99 when i was in middle school. anyway, does anyone have one they are willing to part with, or know of a cheap source of them? thanks -Joe

17 years, 5 months

RS232 voltage level converter box

by mbbrutman-cctalk＠brutman.com

I came across something strange that I need some help with. Pictures are here: http://www.brutman.com/2008_1117_140718_RS232_conv_back.jpg http://www.brutman.com/2008_1117_140718_RS232_conv_top.jpg It looks like a converter box that takes TTL level serial signals and converts to RS232 levels, kind of like the MAXIM single chip solution except that it is using 1488 and 1489 chips. The problem is that it came with a PCjr, but it doesn't physically plug into a PCjr. The onboard serial port is only 16 pins, while the rectangular connector here is 20 pins. It physically doesn't work. Does anybody know another machine or card that might have used the 20 pin header for a serial port? I'm almost thinking that I'm missing another piece (a card internal to the machine) that the header goes to. Regards, Mike

17 years, 5 months

Seeking Proteon P4100+ router manuals

by james＠jdfogg.com

> I'm looking for a set of manuals for the Proteon > P4100/P4100+/P4200 routers, circa 1989 or earlier. I'm > guessing Proteon was an independent company until DEC > bought them at some point? Just guessing. Anyway, if > you've got a set of manuals I'd be interested in > purchasing them from you. > > Please contact me directly if you have some. Wow, there's a flashback. I was working for Proteon when these were developed. I helped prototype some of the boards. I used to work extensively with these post-Proteon and now remember almost nothing about them.

17 years, 5 months

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