test-drb May 2012

test-drb@ccmp.vtda.org

189 participants
220 discussions

by elson＠pico-systems.com

> Date: Sat, 26 May 2012 15:53:35 -0700 (PDT) > From: Mr Ian Primus <ian_primus at yahoo.com> > To: cctalk at classiccmp.org > Subject: PDP-11/05 Control (M7261) won't deposit > Message-ID: > <1338072815.56383.YahooMailClassic at web121606.mail.ne1.yahoo.com> > Content-Type: text/plain; charset=us-ascii > > Working on a PDP-11/05. The front panel appears to work, I can step through and examine addresses in memory, and I can run the CPU and halt it. Deposit, however, does NOT work. When the deposit switch is flipped, the LED's show the correct value, but examining the address again shows no change to memory. > > I know that this board is the problem, having swapped in a module from a working computer. I can, with the good board, toggle a test program into core. Then, shut it off, switch in the bad board, and the program (still in core) runs, and I can examine all areas of memory and see it correctly. > > I've only begun to glance at the schematics for the control board, but I would assume there is some kind of write buffer that's not working correctly. I'm going to continue to try to figure this out, but without a card extender, it's very difficult to troubleshoot > Well, it is not likely to be the buffer (register) as this would require 16 bad FF's. Does the address increment when you hit deposit? If so, that means the switch is being sensed. So, the problem is likely the write command is not getting to the memory. There are a bunch of ways to make a front panel work, but since this is a raw logic machine (no microcode) they probably worked hard to minimize the logic needed. So, probably the deposit and exam logic share a lot of functions, but there is probably a FF that is set for deposit and cleared for exam, and then feeds through some gates to perform the memory read or write. Something in that chain of logic is most likely where the problem is. Jon

12 years, 1 month

UC08/III to UC08

by shadoooo＠gmail.com

Hello. I have an UC08/III, the quad QBUS board with two SCSI controllers, with metal panel for MicroVAX). I would try to convert it to a plain UC08, the version for LSI11 without the metal panel. The doubt is about the electrical compatibility: if I could remove the panel and solder in place the 50pin berg connectors, the card could work on a PDP11 in MSCP / TMSCP? Andrea

12 years, 1 month

DEC H9281 backplane?

by mcguire＠neurotica.com

Hey folks. I'm looking for a DEC H9281 backplane, the four-slot, dual width one with screw terminals for power. Does anyone have one lying around that they can part with? -Dave -- Dave McGuire, AK4HZ New Kensington, PA

12 years, 1 month

Emulex UC07 Problems...

by bqt＠softjar.se

On 2012-05-17 10:00, Holm Tiffe<holm at freibergnet.de> wrote: > Hi, > does someone has a newer firmware Version for the UC07 as G143R? > > I have a double UC07 in my 11/83 and have problems to get Disks > with 4Gbytes working. (DCAS-34330 50 pin). I have an Conner CFP2107S > wich has 2 Gigabytes, I can split the drive and successfully format > the resulting drives with XXDP or RT11. When I connect the 4GB Disks, even > when I fake the geometry to 2Gbytes, the controller successfully formts and > thest the drives, but an init du0: from updat in xxdp doesn't come back. > same with mdup.mu from an RT11 tape. It simply hangs. > > Disk space isn't the concern why I'm trying to use the IBM drives, those > disk are quiet comparing to the conner 2107s, that is what I want. > > Any Ideas? Sounds like there is nothing wrong with your controller. I would suspect the software have problems with such large disks... Not that uncommon actually. It wasn't until RSX-11M-PLUS V4.6 that RSX correctly handles disks larger than the max capacity of the OS (which is 8GB for RSX, by the way, but most other OSes have smaller maxes). Johnny

12 years, 1 month

Fan-fold paper tape

by peter＠vanpeborgh.eu

...Preferably from Data General. Guys, does anyone out there have some of these? I am a collector and ex-DG employee and would really like to have one or two of these for my collection. Price negotiable... Many thanks, peter || | | | | | | | | Peter Van Peborgh 62 St Mary's Rise Writhlington Radstock Somerset BA3 3PD UK 01761 439 234 || | | | | | | | |

12 years, 1 month

cctech Digest, Vol 105, Issue 42

by michael.99.thompson＠gmail.com

> From:?"J. David Bryan" <jdbryan at acm.org> > Date:?Sat, 26 May 2012 00:38:37 -0400 > Subject:?Re: HP 3000 micro gx booting MPE/V, Help >>>> > The HP Computer Museum appears to have MPE FOS images available: > ?http://hpmuseum.net/exhibit.php?swc=22 > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?-- Dave The RICM has an HP 3000 Series 70. Will this OS run on the Series 70? http://www.ricomputermuseum.org/Home/equipment/hp3000-series-70 -- Michael Thompson

12 years, 1 month

pdp-8/m for sale in Northern Virginia

by lists＠loomcom.com

As much as I would love a pdp-8/m, and as much as I'll probably kick myself for not calling about this, the expense of buying it, crating it, and having it shipped it to California would just more than I care to take on right now. If this were west of the Rocky Mountains, it would already be in my car :) I have no more info than what's in the post. I don't know what "worse for wear" means in this case, but I hope it's not too beaten up. http://washingtondc.craigslist.org/nva/sys/3030206025.html -Seth

12 years, 1 month

Cross post VAX POLY question question

by abs＠absd.org

A question of nettiquette for the list :) If I had a question regarding the VAX POLY instruction and alternatives for post CVAX processors which I think might be relevant to cctech at classiccmp.org and port-vax at netbsd.org would it be considered port manners to cross post to both? :) (Or would cctalk@ && port-vax@ be a better cross post if any?) Thanks

12 years, 1 month

HP 3000 micro gx booting MPE/V, Help >>>>

by g-wright＠att.net

Any Hp Mpe folks left out there I have non working 3000/37s with possibly good drives and a 3000 micro GX that works but has a bad drive. I have tried to boot the micro GX from the 3000-37 drives and get this far. ---------------------------------------- Cold Boot > HP 32033G.B2.02 Performing a Coldstart Following Volumes not found MH7957U1 List Volume tables ? ---------------------------- Seems to freeze after that. It does this on 2 different drives. Is this even possible to do ??? Does anyone have a OS tape for one of these ??? and which manuals cover the boot menu and/or startup. I would like to get both going but the 3000-37's have dead mother boards. Stan Sieler, are you still around. Seems like every search I do comes up with your name and advice. Thanks, Jerry Jerry Wright g-wright at att.net

12 years, 1 month

Software for OCR'ing paper tape? (was: Question about, Military

by jonas＠otter.se

On Tue, 22 May 2012 19:31:10 +0100 (BST), ard at p850ug1.demon.co.uk (Tony Duell) wrote: > I personally find it ridiculaor that people are suggesting that something > like a paper tape reader, for which the mechanical parts could be made in > any model engineer's workshop and the electronics is a handful of parts > should be emulated by a scanner (many moe photodetectors than necessary > and a powerful processor to prewcess the images from said scanner. Please > stop trhwing silicon ant the problem! Am I completely wrong if I think I remember that the sprocket holes have a fixed relationship to the data holes? If so, it ought to be possible to build an optical decoder, illuminate it with a simple light bulb, connect it to an input-capable parallel port on a computer with suitable software, and simply pull the tape through by hand? The sprocket holes would function as a clock for the data. Agreed it is rather primitive, but for a one-off job of not too much tape it could be less work than messing around with a scanner. /Jonas

12 years, 1 month

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test-drb May 2012