test-drb

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101090 discussions

by jhfinedp3k＠compsys.to

This request is for Al Kossow. However, if anyone else knows where AA-5286M-TC is located as a PDF on the internet, it would be appreciated. I have downloaded the V05.06 PDF from one of the mirrors: AA-5286L-TC_RT-11_System_Release_Notes_Aug91.pdf http://bitsavers.trailing-edge.com/pdf/dec/pdp11/rt11/v5.6_Aug91/AA-5286L-T… THANK YOU very much for making this PDF available. However, I don't see the V05.07 PDF of the RT-11 Release Notes anywhere. If there is a copy, could you please provide the link? I presumed that if it existed, that PDF file would have been at: AA-5286M-TC_RT-11_System_Release_Notes_Aug98.pdf http://bitsavers.trailing-edge.com/pdf/dec/pdp11/rt11/v5.7_Aug98/AA-5286L-T… but that sub-directory does not exist. As I have mentioned in a previous post, the RT-11 DOC set manuals for V05.06 and V05.07 are IDENTICAL except for: AA-5286L-TC RT-11 Release Notes for V05.06 of RT-11 which was dated August 1991 and AA-5286M-TC RT-11 Release Notes for V05.07 of RT-11 which was dated October 1998. Does anyone else know if the V05.07 RT-11 Release Notes manual is available as a PDF? If so, could it be added to the bitsavers mirrors? Jerome Fine

10 years, 7 months

ESR Meter Recommendations

by jnc＠mercury.lcs.mit.edu

From: Eugene (W2HX) > to model this using ideal components, we show a resistor in parallel to > the capacitor ... This modeled parallel resistor represents the leakage > current. > ... > because it is not ideal, some power is dissipated. This dissipated > power is represented by a series resistance. Because an idealized > circuit with a cap and a resistor in series will not pass DC current, > this circuit must be tested at AC. So I'm slightly confused; you talk about the model being a parallel resistor (which I get), but then switch to a series resistor. Why the switch? Noel

10 years, 7 months

A new Lisp-based OS that hearkens back to the old days of comprehensible computers

by lproven＠gmail.com

A little offtopic but I hope of some interest. I rather miss the days of small, simple, 8-bit computers which a single non-specialist could really get inside and understand. The latest OS I've seen which addresses this longing is Interim. http://interim.mntmn.com/ This is most of the introduction from the explanatory paper: ? Computers, networks and the software running them today are shrouded in mysteries and corporate secrecy. As miniaturization progresses in the name of mobility and energy-efficiency, an increasing amount of complex functionality is crammed into ever smaller System-on-Chip dies. The so-called "Home computers" of the 1980s contained comparably larger and simpler circuit boards with blocky, easily discernible DIP (Dual in-line package) components and circuits that could be visually understood by the human eye. The central processing unit (CPU) was easily identified by its size and exposed placement. The separate memory chips were neatly arranged like terraced houses. The computers worked in pedestrian single-digit-Mhz speeds and memory was measured in kilobytes. They shipped with handbooks that taught a novice reader how to program the machine, and a circuit diagram of the whole machine ? useful for repairs ? was easily available. In the 1980s home computer era, operating systems where typically stored in read-only memory (ROM) chips. As in modern proprietary operating systems, the source code was not directly available, but this was not strictly necessary, as they were written in assembly language and not "compiled" from a higher level language. Commented "dis-assemblies", machine code listings, were available in printed book form [Schineis1984] for popular computers like the Commodore 64 and its "KERNAL" OS and BASIC language interpreter. Today, we have Linux, probably the most successful open source Unix-like operating system and the BSD family of OSes, but these systems and most of the platforms they run on (PCs, ARM-based telephones) are so complex and contain so many obscure components that no single book can describe their operating principles in full detail, and trying to understand and master them is a task that takes many years of study. With "Interim", I try to describe a computer and operating system that takes advantage of modern-day hardware technology while ideally being fully comprehensible in a couple of days. My strategy is to use minimalism and generic, reusable patterns wherever possible while learning from historical, ultimately unsuccessful but valuable attempts like Lisp machines or the operating system Plan 9 from Bell Labs [Pike]. The Interim system is supposed to be a pointer in the right direction, not a perfect blueprint, and a documentation of my own experimental attempts. Others may build upon these ideas. ? (Yes, it's Lisp-y.) The previous OS with this view being TempleOS: http://www.templeos.org/ This is a nice explanatory quote: ? The main reasons TempleOS is simple and beautiful are because it's ring-0-only and identity-mapped. Linux wants to be a secure, multi-user mainframe. That's the vision for Linux. That's why it has file permissions. The vision for TempleOS is a modern, 64-bit Commodore 64. The C64 was a home computer mostly used for games. It trained my generation how to program. It was simple, open and hackable. It was not networked. The games were not multimedia works of art, but generated programmatically with innocent, programmer (non-artist) quality graphics. It was simple and unsecure. If you don't have malware and you don't have bugs, protection just slows things down and makes the code complicated. ? Source: http://www.templeos.org/Wb/Home/Wb2/TempleOS.html -- Liam Proven ? Profile: http://lproven.livejournal.com/profile Email: lproven at cix.co.uk ? GMail/G+/Twitter/Flickr/Facebook: lproven MSN: lproven at hotmail.com ? Skype/AIM/Yahoo/LinkedIn: liamproven Cell/Mobiles: +44 7939-087884 (UK) ? +420 702 829 053 (?R)

10 years, 7 months

PDP8 Front panels

by rodsmallwood52＠btinternet.com

Hi Guys I think we are all set. The plexiglass blanks are at the silk screeners. The artwork for five different PDP-8 front panels is done. If all those who elected to wait even though prepaid would please request the latest file with all five designs in. The same goes for anybody who is interested in replacement panels for PDP8/e (both types of switch markings) PDP8/f , PDP8/m or industrial8. please contact me by email The 8/f and 8/m will be a few dollars more as we need an extra screen for the logos as they are colour as opposed to the 8/e which is white. If anybody spots an error on my part in any of the drawings please let me know. If you have any scanned images as opposed to photographs I'd love a copy. Regards Rod Smallwood -- Wanted : KDJ11-E M8981 KK8-E M8300 KK8-E M8310 KK8-E M8320 KK8-E M8330

10 years, 7 months

PiDP8/I & ETOS

by fast79ta＠yahoo.com

I've been monkeying around with Oscars amazing PiDP8 replica the last few weeks, attempting to get a cool demo going for the local hackerspace, to show what computing used to look like. I've managed to this point to get 2 serial terminals (a DEC VT102, and a Morrow MDT-60) running at the same time on simh4 and ETOS. I do have the set tsc enabled, and .R ETOS is up and running. I've stumbled through enough of the config to add a second serial terminal on the KL8JA using IOTTAB. I can run basic, and a few other programs at the same time on either terminal, and watch it time share the limited resources (I have simh throttled to .5 Mips, which apparently is correct for an 8/I). The step I'm at now, is I'd like to copy a bunch of OS/8 games into either a public disk, or make an RK05 image available to either a single user, or as a public disk. I would be great to have advent.sv running on one terminal, or star trek on another. Maybe blackjack, or hangman. I'm running the etosv5b-demo.rk05 file from http://www.pdp8.net/os/etos/ (located in ftp://ftp.pdp8.net/images/etos/), configured for extra KL8JA terminals. I do have the user manual, and system managers guide for ETOS, that I've changed from multipage .tiff to a single PDF. I've read the SMG around 5.11 (Creating a public pack), but it references a cmd .R DSKINT, which doesn't appear on any of the available ETOS rk05 images. I also don't see (and I might be missing something obvious), a way to mount an RK05 disk so even a single user can access it at a time.. Thanks for reading. Joe

10 years, 7 months

DEC handles

by jnc＠mercury.lcs.mit.edu

> From: Joseph Lang > There's a surplus place here in Orlando that has a bin full of dec > style handles in white. Google skycraft surplus. I just called them, but they couldn't find them? How long ago was it that you saw them? If recently, can you describe where it was in the place that you saw them? Thanks! Noel

10 years, 7 months

DEC handles

by steve＠tronola.com

Hi Noel, > Hi all, does anyone know of a source for the plastic handles on DEC > Flip Chip > modules (single, double and quad)? --- When I bought the Omnibus prototyping board from Douglas Electronics by phone a few years ago, the lady I spoke to offered to include handles for a small price. The board I ordered, by the way, was their part number 12-DE-8. I have not found the handles mentioned on their website but I might have missed it. The board product link is: http://www.douglas.com/index.php/12-de-8.html Steve Lafferty http://www.tronola.com/

10 years, 7 months

DEC handles

by jnc＠mercury.lcs.mit.edu

Hi all, does anyone know of a source for the plastic handles on DEC Flip Chip modules (single, double and quad)? Magenta would be great, but really, any colour would be acceptable, if magenta's not available. (And no, I don't want to salvage them from otherwise useless cards!) Noel

10 years, 7 months

PDP-11/70 console panel for SimH

by j_hoppe＠t-online.de

Hi, I just finished a virtual PDP-11/70 panel for SimH. As always it's a BlinkenBone application; description and download is here: http://www.retrocmp.com/projects/pdp-11-70-panel-on-blinkenbone/243-simulat… After the PDP-11/40 and the PDP-10 KI10, this is the 3rd panel connected to SimH in a both a physical and a simulated version. I'll show this simulation, the physical PDP-11/70 panel and some more panels on VCFB in Berlin, october 3rd and 4th. http://www.vcfb.de/2015/index.html.en Have fun! Joerg

10 years, 7 months

PC8E interface to other tape readers?

by charlesmorris800＠centurytel.net

The 8/A's power supply, RL02's and RX01 is all working fine (knocking on wood)... so far, no return of the dreaded Power OK "flicker". Maybe it really is fixed this time.. Famous last words, I know! Now I am pondering my PC8E (M840) reader/punch control board, and a Slo-Syn TRP125 reel-to-reel 1" 8-bit paper tape reader that's been sitting unused in my other rack, probably for at least ten years when I got it very cheap. I'm thinking of interfacing them since I don't have a PC04 and no pressing need (or money) for one. The TRP125 can do 125 characters per second, not as good as the 300 of the PC04 but still much faster than the ASR-33 if I feel like messing with paper tapes... The drive just needs a pulse to move the tape. Data can be read/strobed into the PC8E register almost any time the tape is not actually moving. (A real PC04 has a stepper motor controlled by the PC8E, so one of those four step outputs will probably work as a move pulse). Doubt I'd ever need to back up the tape one character. Timing will probably need to be adjusted for some pulse widths and the rep rate which is slower. (1 byte is 8 ms on this one but 3.33 ms on the PC04. The no-tape timeout of the PC8E is 10 ms). One thing missing from the TRP125 is a tape-out indication and motor stop, though. The TRP125 reel drive motors keep spinning until the tension arms are manually raised to a detent position that actuates microswitches to turn the motors off. The ASR-33 stops automatically when the tape has run out, which would be useful. I suppose I could add a microswitch to sense the presence of tape, or perhaps an LED/photocell to read the sprocket holes and provide pulses as the PC04 does. Otherwise I'd have to "fake" the feed hole pulses and manually shut the reader off once the tape runs out. I'd like to hear from anyone who's done something similar to interface a non-DEC tape reader. thanks Charles

10 years, 7 months

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