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101090 discussions

Looking for PDP-11/03 front bezel (2U high)

by steven＠malikoff.com

Hi all, I'm looking for the front panel for a 19" 2RU (3-1/2") high four-slot PDP-11/03-KA, with a rectangular hole for the three switches. Looking at photos on the web, some appeared to have badges and some didn't, is that the case? I've not much to swap in my 'stash' except some old Terak Qbus cards and a hex-height Unibus M7234 timing board from an 11/40, of unknown working condition so I'm happy to Paypal if you had one. Thanks for any help - I recently joined this list and the posts I've seen so far are really interesting. Regards, Steve Malikoff.

11 years, 5 months

Seeking HP1000/21MX TTY (12531B/C) board

by johannesthelen＠hotmail.com

I'm planning connect my HP1000 to ASR-33, so I could play with it for real...but only problem: I have no TTY board :( Anyone have spare for sell/exchange/donate? I might consider give up my Grumman HP1000 SCSI controller board in exchange... Also I'm interested other boards (X&Y and RS232), peripherals and etc. HP stuff... - Johannes ThelenFinland Before microcomputers blog (Finnish) http://ennenmikrotietokoneita.blogspot.fi/

11 years, 5 months

Data General 800 or 1200 frame, power supply and front panel

by jws＠jwsss.com

I have a friend with a large number of pulls from DG 800's and 1200's and am sending out a general query to see who might have a chassis to serve as a system for testing and eventual build up of a system. We will be photographing / posting somewhere the boards, but he feels they are ffrom the Nova 800 or 1200 and not later. Thanks Jim

11 years, 5 months

Sigma Electronics Systems Display Generator 5564

by ard＠p850ug1.demon.co.uk

Can anyone tell me anything about the subject: line? It seems to be a high-end graphics terminal from the mid 1970s. I have found the electronics unit while unpacking here, I think I have the keyboard (with a little built-in joystick?) somewhere too. I don't have the monitor, but I am guessing it's TV rates. Pysically it's just a metal box (about the size of a 4U rack unit without flanges). There is nothing on the front panel. The back panel has the on/off switch and connectors for a keyboard (DA15), 'Digital Video' (ditto), Host and Downstream RS232 ports (DB25, of course) Host and Dowstream current loop ports (DE9), 3 video outputs (BNC, I assume these can be used as R,G,B), mix video output (ditto) and video input (my guess is that the terminal video can be overlayed on some other video signal, again a BNC). The top cover comes off with 2 screws. It reveals very little apart from a massive linear PSU. The interesting stuff is exposed by removing the front panel (4 screws) which gives access to the card cage. There are 2 columns of half-width cards at the top, then about 7 full width ones. 2 of the half-width cards are wire-wrapped not PCBs. I forget what they do, one of them seems to be the video timing/sync counters. On other half-width cards are the processor (6800), ROMs (lots of EPROMs),Comms, video output (resistor DACs, etc) and a 'vector generator' which I guess is to draw lines, it's just a lot of of logic ICs, no microprocessor. One of the full-width cards is something like 'area fill'. So it does that in hardware too? The others -- and there are half a dozen of them -- are 'Pixel Store'. Each has 16K*16 of DRAM and a 16 bit ALU (4 off 74181). I hate to think how much this cost when new. RAM and ALUs were not cheap! -tony

11 years, 5 months

PDP-11 with ATX power supply

by earl＠retrobits.com

Hello fellow DEC enthusiasts, I have a BA11-N mounting box with Q18 9-slot quad-height backplane. The power supply is toast. My goal is to hack it into something useful. I'd like to replace the power supply with a sufficiently-powered ATX PSU. I've read the instructions at: http://www.diane-neisius.de/pdp11/index_E.html#atx However, unlike the DEC PSU, the ATX power supply won't supply a 60 Hz line time clock (LTC) signal to the backplane via BEVENT. So, my question - has anyone used a standard ATX PSU for a PDP-11 QBUS system, and if so, how'd you work around the LTC issue? Once I solve the power issue, I have 11/23 CPU cards, RAM, and SLUs galore. I'm not planning to make this very power hungry though. Thanks! - Earl

11 years, 5 months

Input text, output 300 bps?

by mikew＠thecomputervalet.com

I?m wondering if anyone has seen something like this: You input text. The program converts the text into what it would sound like if it were being transmitted at 300 baud which you can then save. Oh, I imagine that, say, I dunno, some kind of 300 baud modem could do this, but I don?t have such a beast. I wondered if someone may have created such an item as a programming exercise.? Cheers, m

11 years, 5 months

Ceiling Apples

by terry＠webweavers.co.nz

An account of a small vintage computer rescue. Not uncommon machines but I'm glad I saved them from the scrapheap. http://www.classic-computers.org.nz/blog/2014-12-23-xmas-apple-salvage.htm

11 years, 5 months

PDP 11/40 AC LO and M7235 (Status K5 Module)

by billdeg＠buzz1.com

> > > From: B Degnan > > > Yes, steady voltage > > I think Tony meant 'did you look at it with a 'scope'... :-) > > Noel I used two different scopes and a Fluke meter that can capture MIN/MAX. It's a nice steady flow as far as I can tell. The min/max is in the hundredths place, there is no major ripple. Bill

11 years, 5 months

PDP 11/40 AC LO and M7235 (Status K5 Module)

by jnc＠mercury.lcs.mit.edu

> From: B Degnan > Yes, steady voltage I think Tony meant 'did you look at it with a 'scope'... :-) Noel

11 years, 5 months

Math software - was Re: Rich kids are into COBOL

by Arno_1983＠gmx.de

On 06/03/15 9:40 AM, Mouse wrote: >>>> one other, which you may or may not classify as a ?language?, is >>>> Mathematica. >>> I don't know enough about it to offer an opinion [...] >> I've been using Mathematica for years. [...] I've also used MatLab >> which also falls somewhat into that category. MatLab is is really >> optimized around vectors and arrays. > > That might be more similar to APL, then. > > This has been rattling around in my mind for a little while now and I > think one reason I didn't think of things like Mathematica or Matlab is > that they're single-implementation. ... > > /~\ 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 > As I haven't yet seen it mentioned in this discussion, I think I need to toss in Scilab (http://www.scilab.org/ , also on WP), which is a Matlab workalike that came out of a French mathematical research iInstitute (INRIA, Institute Institut national de recherche en informatique et en automatique). It is under a GPL compatible license (CeCILL) and should therefore also work for those of us for whom free beer isn't free enough :) I used it^w a tiny portion of it during my student thesis for predicting and comparing the EMI spectra of phase and burst fired power controllers under different load conditions and power settings. So Long, Arno

11 years, 5 months

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