test-drb

test-drb@ccmp.vtda.org

101090 discussions

by aek＠spies.com

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2037121806 I wanted to get this for the documentation, but I'm not going to be able to deal with this by the end of the month, which is when it has to be gone. If someone can get it out of there, let me know.

23 years, 8 months

I don't remember... help..

by rhudson＠cnonline.net

I am trying to remember the apollo systems I was administrating in about 1984 while I worked for CALMA. They were very large, slightly smaller than a 3 foot cube, They had very large monochrome displays (21") and ran an os known as appollo domian, which was very unix like. They keyboards all had touch pads. The systems were connected via the same type of coax used in cable tv. They were connected in a loop. One system had a open reel tape drive, one of the slide in reel types that threaded itself. There may have been a color version too.

23 years, 8 months

Stuff available: PDP-8 desk, Masscomp

by e_cloud＠yahoo.com

I have to get rid of some of this bulky stuff that I'm not getting much use out of... I have a PDP8 desk (sunken area for console, rack under the left side) that I was using for my PC workstation but have since built another desk that holds more equipment, so this one is now surplus. The power controller that came with it is available depending on how much you want to offer. I never had the computer itself; I found this desk at ASU surplus several years ago. I found a picture of it on the 'net a while ago but have lost the link. I have a Masscomp of some kind. It's dusty now and I haven't tested it, but a friend unloaded it on me a couple years ago and told me it worked the last he knew; it has a hard drive and floppy, and a lot of serial ports. It is mounted in a rack about 4' high, which is half-empty. I have a lot of manuals and disks etc. for it. I was told this is an early real-time Unix system using the 68K processor. I live in Phoenix, AZ and you would need to pick these up. I'm open for offers of any kind on either of them. Please email e_cloud(a)yahoo.com; I will try to check the list but I'm subscribed in digest mode and will be more likely to notice if you email me directly. ===== . _______ Shawn T. Rutledge / KB7PWD ecloud(a)bigfoot.com (_ | |_) http://ecloud.org/ kb7pwd(a)kb7pwd.ampr.org __) | | \______________________________________________ __________________________________________________ Do You Yahoo!? Yahoo! Autos - Get free new car price quotes http://autos.yahoo.com

23 years, 8 months

help needed: problem with UNIBUS access on my PDP-11/70

by GOOI＠oce.nl

The results of the last tests. I measured the contacts on the G7273: all ok. Next test. Conditions: console in slot 40, G7273 in slot 41, M9302 in last slot. slots 42 till last also have G7273's. Result: hung. I swapped (sorry Tony) the G7273 of slot 42 and slot 41. Again: hung. Last test. Moved G7273 from slot 41 back into slot 42 and put the RX211 in #41. The machine runs fine. PROMs on M9312, console, CPU regs, all are accessed without PAUSE going on. > OK, it appears there are 3 possibilities to check out : > > 1) The G7273 card is faulty and/or not making proper contact, > and is thus not actually completing the NPG chain. > > 2) The device _before_ this slot (possibly the arbiter > itself) can drive the input of the RX211 card, but can't drive the > terminator. I have no idea if the latter is a significantly heavier > load, but it might be!. > > 3) There is a problem before this slot (fault on the arbiter), > which is genuinely asserting a grant signal, but the RX211 is > getting into a state where it doesn't pass on grants, so said > errant grant never gets to the M8302 to cause problems. > > Yet again I have to ask you to stop swapping cards around > essentially at random, and to get out the test gear and make some > measurements. With the G7273 card in, look at the grant lines at > the teminator. Is one high? which one? Is it genuinely high, or > marginal? What are the grant lines doing at the arbiter? All low > as they should be? Can you get continuity along the grant chain > with just G7273 cards in the machine? If not, why not? And so on. > Actually get some evidence before trying to cure the fault. > > -tony Well, I am not swapping at random, but at this point the simple tests are exhausted. With the tests/swapping I established good starting points where to look. I agree it is time to pull out the "heavier" tools. This means more than just a quick glance at the schematics. I will post those results, but that might take a while ... tnx all, - Henk.

23 years, 8 months

Motherlode or scrap ?

by lgwalker＠mts.net

Well I finally got back to the salvage/surplus place to get a list of the HP stuff they had and found they had another big room full of stuff they had removed from a large government installation. This was in the attic of a large building during one of the hottest days we've had up here and my sweat was dripping on my notepad so please excuse my attempts to decipher my notes. You must also realize that I'm a complete mini neophyte. The original HP stuff I saw : HP 12979A I/O expander HP 96MX System controller HP 7970B Tape Unit HP 1000 w/ cybernex 1100 term HP System 2748B There were also several HP 2624 A, B, and Standard K-Bs and some monitors or terminals on the skid. The big room was dominated by about 50-60 Sybernex workstations (which are similar to the Wyse ones so often tossed by thift stores), heavy duty monitor arm stands, and metal desks. But then the goodies. About 20 DEC VT420/320/220 terminals A box of LK402 keyboards (20-30 of them) An IBM 3278 terminal A DEC VAX SA482 rack w/4 populated banks About 10 Decwriter II's and III's A DEC VAX 6310 in rack 2 very impressive-looking 5' MagTape racks Honeywell CPUE 111 Morel DP S6/92 There were many other things. Honeywell equipment, large printers. etc. that I didn't write down. Do you think that the Gods are now demanding that I collect mini's, teasing me first with the Pro 350's I rescued from the town dump recently? And in the wilds of north central Manitoba.(Where in hell is that ?) "Winnipegosis sounds like a disease." Lawrence lgwalker(a)mts.net bigwalk_ca(a)yahoo.com

23 years, 8 months

Tape Drive Questions

by palazzol＠comcast.net

Hello, I've spent some time over the past year or so reverse-engineering the Mattel Intellivision Keyboard Component. This was a prototype computer add-on for the Mattel Intellivision game system, which was test-marketed but never released. I'm basically done figuring almost everything out about it, and working on emulating it. You can read about it here: http://www.intellivisionlives.com/bluesky/hardware/keyboard_tech.ht ml The tape drives in these units were unusually sophisticated. They were essentially random-access 4-track cassette drives. Side A was read-only, and side B was read-write. Also, on each side, the left channel was audio and the right channel was digital data, directly recorded. This would allow for applications to Read/Write digital data and play/record audio simulataneously. They also has the ability to detect the tape leader via an optical sensor. The 2 questions I have are: 1) Does this drive sound like a drive from any other vintage computer system? 2) Anyone know who could tackle repairing such a thing? I've had no trouble fixing electrical problems, but tape drives are a whole different animal... I've basically examined 4 of these units and they all have mechanical problems. Emulating the system may prove to be the only way to ever see the software running. Thanks, Frank P.S. - If I make it to VCF 5.0, I'd like to do a talk about emulating old systems in general, and using this one as an example in particular. It's quite a beast.

23 years, 8 months

Motherlode or scrap ?

by healyzh＠aracnet.com

> --- "Zane H. Healy" <healyzh(a)aracnet.com> wrote: > > Warning, collecting Mini's is a dangerous disease that will seriously > > effect you mentally (what might be even worse is how it effects your > > amount of empty storage space). > > True. I have mine spread amongst 4 locations (several thousand sq ft > total). I'm looking into buying a warehouse between my house and the > airport. The main building (of four) is 100' x 160'. The good news > is that it happens to already *be* one of my four locations (the owner > has been casually looking to sell for a couple of years and recently > asked me if I was interested; I'm crunching numbers ;-). One nice > thing is I'll finally be able to deploy my raised floor (rescued from > a former employer 10 years ago). If this doesn't work, I'll be putting > up a new (much smaller than that) building next to the quonset hut at > the farm. > > > I recommend avoiding it at all costs. > > > > Zane > > Absolutely. In fact, you should call one of us to save you from > the peril. :-) You do realized that you just proved my point (as well as Ben's)? Zane

23 years, 8 months

Motherlode or scrap ?

by xds_sigma7＠hotmail.com

A DPS-6/92 is a 32-bit member of the DPS-6 (formerly known as Level 6) family.. Ran GCOS mod 400 or mod 600, possibly the Ultimate OS as well (a Pick OS for DPS-6s).. Well I'm fairly sure its 32-bit, earlier DPS-6s were 16-bitters but I'm nearly certain that a 6/92 is a 32 bit.. I believe the maximum memory for it is 4 million words.. Fast fast machine, mid to late 1980's vintage.. What peripherals are wih it? Honeywell's line printers were mainly Dataproducts units, the terminals should be VIP7xxx family I believe, could possibly be branded as Bull, since Groupe Bull bought Honeywell's computer division after years of co-development.. Disk drives I believe are OEM'd CDC units, same with mag tape drives... I don't know if anyone else would, but I'd sure pay money for it and all the related bits.. Hope you've gained some info on it from my description.. Will J _________________________________________________________________ Join the world’s largest e-mail service with MSN Hotmail. http://www.hotmail.com

23 years, 8 months

IMPORTANT LIST CHANGES

by lists＠subatomix.com

This is your interim list admin speaking. Jay and I have been working together to bring about a major change for the better for the ClassicCmp mailing list system. It is important that you read this entire message. Ever since the two-list system was implemented earlier this year, cctalk and cctech have been somewhat separate communities. Posts from cctech were automagically forwarded to cctalk, but no posts from cctalk were forwarded to cctech. This could result in many on-topic conversations taking place in cctalk but never reaching cctech, which greatly detracted from cctech's value. This is no longer the case. As of a few minutes ago, all posts to cctalk will be forwarded to cctech. Each one will be subject to moderation, where I will weed out any off-topic posts. All posts to cctech are still forwarded to cctalk as they have been. In effect, the list has become a single unified ClassicCmp again, but now with two interfaces. All on-topic posts to either list will be sent to both lists. Off-topic posts will only be sent to cctalk. Subscribers to cctech won't be left out of the conversation. In a related change, posts to cctech will no longer have the "[CCTECH]" string prepended to their subject headers. This change may slightly adversely affect some subscribers. If you are subscribed to both cctalk and cctech, you will need to either unsubscribe >from one of them or set the "no-mail" option on one of them. If you do not do this, you will receive two copies of each on-topic message. If you do stay subscribed to both lists, please exercise extreme caution when posting. Your messages will forward between the two lists without generally being subjected to moderator approval. Do not post off-topic messages when your subscription is configured in this way. Thanks, and enjoy the new ClassicCmp! Look for a new web site and FAQ soon! -- Jeffrey Sharp The email address lists(a)subatomix.com is for mailing list traffic. Please send off-list mail to roach jay ess ess at wasp subatomix beetle dot com. You may need to remove some bugs first.

23 years, 8 months

OT: MS/S.Ballmer fesses up... a little

by dwoycies＠yalepress3.unipress.yale.edu

I just thought everybody here might appreciate this. He's finally admitting something world+dog already knew.

23 years, 8 months

LSI-11/2

by mbg＠TheWorld.com

>I've got an embeded syatem based around an LSI-11/2 processor board, >M8044-BB (8KW?) memory, pair of DRV-11's, a MDB eprom board and ADC >board. What do I need to do to make this into a functional PDP-11? I've >got a DEC MSCP ESDI controller (don't remeber the part #), DLV-11 (8-port >version) serial card, TQK50, and drives from my VAXstation 3200 I can >try to use in it. It's from my DPE 5000, the video part of which let out >a bunch of magic smoke being powered on - can't find any obvious burned >parts, but haven't checked the power supply yet. Still, it's worth more >to me as a LSI(PDP)-11 than a video effects box that I can't fix. You haven't mentioned what kind of backplane it has (Q/Q vs. Q/CD), whether it has 22-bit (I suspect just 18-bit) and how many slots. These will all affect what the suggestions. Going with what you have, I might suggest upping the power from an 11/2 to an 11/73 (KDJ11-A), which takes up no more room in the backplane. >First, however, I'm sure I need DEC boot roms for it, or some other way >to get boot code into it. Does anyone happen to have some laying around >they could maybe send me an image of? Also, I'm on the lookout for a >RLV12 and berg cable to connect to the RL02 I have sitting around here.. I would suggest an MXV11-B, which gives you two serial lines, memory and boot code in one dual-high board. Beyond that, the DEC MSCP board is probably an RQDX(3?) and is not ESDI (I don't think there was an ESDI board made by DEC... all the ones I got while inside DEC were made by Andromeda -- the ESDC board). Finally, a DELQA for network and you're all set. Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | email: gentry at zk3.dec.com (work) | | Unix Support Engineering Group | mbg at world.std.com (home) | | Hewlett Packard | (s/ at /@/) | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 (DEC '77-'98) | required." - mbg KB1FCA | +--------------------------------+-------------------------------------+

23 years, 8 months

[phunt@ICW.ie: PDP-11's] (Ireland)

by mrbill＠mrbill.net

Please contact Patrick directly. Bill ----- Forwarded message from phunt(a)ICW.ie ----- From: phunt(a)ICW.ie To: mrbill(a)pdp11.org Subject: PDP-11's Date: Wed, 17 Jul 2002 16:00:21 +0100 Hi, Not sure if you meant it, but have two full working PDP-11's with various disks, drives etc which we have just decomissioned and are about to dispose of. If you know anyone interested in any of the parts, let me know quickly. thanks, Pat Patrick Hunt IS Services Nexans Ireland Limited Athlone Co.Westmeath Ireland Ph: +353-902-75001 Fax: +353-902-74968 e-mail: pat.hunt(a)nexans.com Web: www.nexans.ie ----- End forwarded message ----- -- Bill Bradford mrbill(a)mrbill.net Austin, TX

23 years, 8 months

Commodore stuff for goodbye... (and one OT item...)

by zmerch＠30below.com

Have some commodore stuff to get rid of; most needs to be boxed; will see what I can do to alleviate cost of boxing... Shipping from 49783; have a "Pack -n- ship" place next door, so there is usually a surcharge to normal UPS/Fedex prices (being next door, we usually get a bit of a break, however). All of these items are "condition unknown" - they were given to me, and I've never had 'em hooked up. No warranties, and all that jazz. (1) MPS802 printer - in original box with original styrofoam; ready to ship (just needs to be taped up) - looks to be in really good shape, but that's just looks... (1) MPS802 printer - no box, no top cover. (1) Model 1351 mouse (2) old-style C=64s; 1 looks complete, the 2nd missing keys from the keyboard. (1) new-style C=64 (similar case to the C=128) - looks complete, has a "document support stand" attached just above the function keys. (3) Model 1541 floppy drives - one is in the original box, and has a garage sale sticker that says "doesn't work, $1.00" - the other two are bare; obviously; condition unknown. (1) commie (clone) drive of unknown specific origin: sole marking on the front says "excelerator plus"; back says on small sticker: "Oceanic Electronics Corp. / FCC ID: GLB3390C-118 / Golden Image / Made in Taiwan / [FCC blurb]" - serial # 1149152. Your guess is better than mine... :-) (2) manuals - one listed as C64 user's manual, one listed as C64 user's guide; printed in prolly 1984 & 1983 respectively. All for cost of shipping, and boxing if I can't find the materials... If local pickup (Sault Ste. Marie, Michigan; take I-75 north until everyone says "eh?" ;-) it's free, but I'm not holding my breath... The stuff's gotta go ASAP, so unforch, it's first come, first served... =-=-=-=-=-=-=-=-=-=-=-=-=-= OT blurb: I have a PlayStation 1 available with some interesting goodies; $100 shipped; contact me off-list if interested. -- Roger "Merch" Merchberger --- sysadmin, Iceberg Computers Recycling is good, right??? Ok, so I'll recycle an old .sig. If at first you don't succeed, nuclear warhead disarmament should *not* be your first career choice.

23 years, 8 months

help needed: problem with UNIBUS access on my PDP-11/70

by GOOI＠oce.nl

> Gooijen H wrote: > > By experiment I will check the NPR wire of the other > > UNIBUS slots. You know why once you have seen the > > backplane of an 11/70. > > Johnny Billquist <bqt(a)update.uu.se> wrote: > > Huh? It's no more difficult checking the NPR wire in the > > 11/70, than on any other Unibus backplane. And it *is* > > rather simple to see if the jumper is there or not. > > On the 11/70 Mike and I have been working on, the NPR grant > jumpers were wrapped before most of the other wiring, rather > than after. This makes it fairly difficult to see them. On the 11/70 backplane I have, the NPR grant is also wired before all other wires. That is what makes me nervous when I start thinking about cutting a wire for a DMA device. A DD11-DK 9 slot gen purpose backplane is a lot easier when it comes to accessing the NPR wires. I agree that *looking* with a good light source is not too difficult. - Henk.

23 years, 8 months

Quadram Quadboard

by pat＠purdueriots.com

Hi all, I'm trying to get two of these to work in a single PC XT so I can max out the memory. I have figure out the 'left' set of dip switches sets the memory starting address, but need to determine the functions on the right set of switches so I can modify the printer port I/O address, serial port address, and hopefully the size of memory that it thinks is on the board. Any help would be appreciated. Thanks. -- Pat

23 years, 8 months

Need Info on MicroHelp Digitizer

by jrkeys＠concentric.net

Picked up a microhelp digitizer made in 1990 and it is a very small box with a ribbon cable hanging out one end with a 25 pin female connector on it. The other end has female phono connector. I looked on the web using google but had no luck. Thanks

23 years, 8 months

VAX11/780 memory / UNIBUS interaction???

by gunther＠aurora.regenstrief.org

Hi, I'm still debuggingmy VAX 11/780 that doesn't pass full diagnostics. Here is a dump of the micro-diagnostic run and second stage SBI/memory/options diagnostics: CPU HALTED,SOMM CLEAR,STEP=NONE,CLOCK=NORM RAD=HEX,ADD=PHYS,DAT=LONG,FILL=00,REL=00000000 INIT SEQ DONE HALTED AT 00000000 (RELOADING WCS) LOAD DONE, 0800 MICROWORDS LOADED VER: PCS=01 WCS=0E-10 FPLA=0F CON=V07-00-L ?WARNING-WCS & FPLA VER MISMATCH >>>TEST ?FILE NOT FOUND >>>TEST ZZ-ESKAB V14.0 ESKAD -- V13.1 01,02,03,04, NO. OF 1K BANKS OF WCS = 0002 05,06,07,08,09,0A,0B,0C,0D,0E,0F,10,11,12,13,14,15,16,17, 18,19,1A,1B,1C,1D,1E,1F, ESKAH-V13.2 20, SYSTEM ID REGISTER = 0140B63E KE780 FPLA NOT PRESENT 21,22,23,24,25,26,27,28,29,2A,2B,2C,2D,2E, 2F,30,31,32,33,34,35,36,37,38,39,3A,3B,3C, END PASS 0001 MOUNT FLOPPY ZZ-ESZAD & TYPE "DI" MIC>DI ESKAR-V2.0 3D,3E, CPU TR = 00000010 MS780H 256K CHIP AT TR 00000001 LOWER CNTRLLR MAX ADDRESS+1= 01000000 UPPER CNTRLLR MAX ADDRESS+1= 01000000 DW780 AT TR 00000003 RH780 AT TR 00000008 RH780 AT TR 00000009 3F,40,41,42,43,44,45,46,47,48,49,4A,4B,4C,4D,4E,4F,50,51,52, MS780-E/H IO BASE ADDRESS = 20002000 LOWER CONTROLLER MAX ADDR + 1 = 01000000 BOARD NUMBER = 00000000 NUMBER OF CRD ERRORS = 00000000 BOARD NUMBER = 00000001 NUMBER OF CRD ERRORS = 00000000 BOARD NUMBER = 00000002 NUMBER OF CRD ERRORS = 00000000 BOARD NUMBER = 00000003 NUMBER OF CRD ERRORS = 00000000 MS780-E/H IO BASE ADDRESS = 20002000 UPPER CONTROLLER MAX ADDR + 1 = 01000000 BOARD NUMBER = 00000000 NUMBER OF CRD ERRORS = 00000000 BOARD NUMBER = 00000001 NUMBER OF CRD ERRORS = 00000000 BOARD NUMBER = 00000002 NUMBER OF CRD ERRORS = 00000000 BOARD NUMBER = 00000003 NUMBER OF CRD ERRORS = 00000000 53, MS780-H 256K CHIP AT TR 00000001 M8376 ROMS OK 54, ?ERROR: 10B8 TEST: 01FF SUBTEST: 0001 DATA: 20002000 20002008 FFFFFFFF FFFFFF00 FFFFFFFF FFFFFFFF 00000000 00000000 TRACE: 00, FAILING MODULES: M8375-L, M8376, I had two more M8375 and another M8376 that came with the VAX 11/785 board set that I bought from Jeffrey Sharp last year. But none of the M8375s changed the problem. When I replaced the M8376 it was even worse: ESKAR-V2.0 3D,3E, CPU TR = 00000010 DW780 AT TR 00000003 RH780 AT TR 00000008 RH780 AT TR 00000009 NO MEMORY CNTRLLRS DEP MS780EH ADDR IN RC0, TYPE LO ?ERROR: 11FA TEST: 0180 SUBTEST: 0001 TRACE: 00, FAILING MODULES: M8376, this time it didn't even go beyond test 3F. So, I put the old M8376 back. And tried to swap the lower and upper M8375s to see if I'd get the problem on the other end. After all, I assume that the message: 54, ?ERROR: 10B8 TEST: 01FF SUBTEST: 0001 DATA: 20002000 20002008 FFFFFFFF FFFFFF00 FFFFFFFF FFFFFFFF 00000000 00000000 TRACE: 00, FAILING MODULES: M8375-L, M8376, means that the M8375-L with "L" for LOWER is causeing the problem. So, I expected M8375-U to be blamed next. But not so. I always get M8375-L, M8376 error. However, what's really strange and the focus of my question is that the outcome depends on whether or not the UNIBUS cabinet is powered on or off. If I have the UNIBUS powered on I get that above error. However, when I have the UNIBUS off, I get this: 54, ?TIMEOUT IN TEST 01FF UPC= 1241 That is, TEST 01FF always fails, but when UNIBUS is off it just times out, when UNIBUS is on we get that failing modules error. Isn't there a way to decouple the UNIBUS issue from the memory subsystem diagnostics? I sort of hope that the boards really aren't broken but some other wires are crossed? I appreciate any advice of you VAX veterans out there! thanks, -Gunther -- Gunther Schadow, M.D., Ph.D. gschadow(a)regenstrief.org Medical Information Scientist Regenstrief Institute for Health Care Adjunct Assistant Professor Indiana University School of Medicine tel:1(317)630-7960 http://aurora.regenstrief.org

23 years, 8 months

Check out the Analog Computer on eBay

by jrkeys＠concentric.net

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2039245615

23 years, 8 months

Quadram Quadboard

by geoffr＠zipcon.net

At 04:41 PM 7/16/02 -0500, you wrote: >Any help would be appreciated. Thanks. how about this URL... http://kibmcz.tripod.com/quad.htm

23 years, 8 months

Motherlode or scrap ?

by healyzh＠aracnet.com

> Doc wrote... > > Well, yes. Everybody gets around to Digital, eventually. > > Yup, they do. Usually after collecting the more interesting HP systems > first, then they do go after the lesser systems like DEC ;) > > <ducks & runs> Just Kidding! > > Jay West You'd better duck and run! After all we all know that the real reason HP bought Compaq was so that they'd finally have some real computers to sell! :^) Zane

23 years, 8 months

Z8000 processor Olivetti M20

by dwightk.elvey＠amd.com

>From: "Hans B Pufal" <hansp(a)aconit.org> > >Dwight K. Elvey wrote: > >> I have a machine with a Z8000 that is working. >> It is the Olivetti M20. You should be able to find these >> in Europe. They were many sold in Italy and Germany. >> It uses a OS made by Olivetti called PCOS. > >Yep, I finally found one in Germany. Do you have software for the >machine? I did snag three manuals, one being the hardware reference >complete with schematics. The other two are the user manuals and PCOS >manual both in english. I could scan or copy in exchange for software. > > -- hbp > > Hi Hans How did the site I pointed you to work out? I am really quite interested in the hardware manual. Dwight

23 years, 8 months

URL Wanted

by jrkeys＠concentric.net

Earlier today their was a URL given for an article on the Mark-8 and my system hung and I lost it. Could you please post it again. Thanks

23 years, 8 months

cctalk digest, Vol 1 #83 - 27 msgs

by gstreet＠indy.net

Hello Dave and Tom, This is my first response to cctalk, so I don't know if it'll "take" or not. Just a couple of comments: I've also got a CRT with crack outer glass. I don't know what type of gel they used to bond the CRT to the outer protective glass, but Tom's suggestion seem plausible--depends on whether or not the "gel" is soluble by acetone and also whether or not the gel is destroyed in the process. Even with optic cement, would it be able to fill large voids left by dissolved gel? I don't have any idea--just asking. If any void remains, it's going to appear as a large "bubble" in your viewing area... Also, I tend to think that gel and protective glass may only be for extra protection. In the "old days" I used to see lots of CRT's that had no protective glass bonded to the front. If you broke the front, you broke the CRT itself. I seem to recall having broken a few of these things with pellet guns when I was much younger and never getting the hoped-for catastrophic implosion (my 6th grade science teacher warned us of when he shot an old TV CRT with a .22 and created a massive and dangerous implosion. Could it be that older and larger tubes were more dangerous for some reason??). I don't know. Maybe the glass is thicker these days. I still respect CRT's, not only for high voltage, but also for possible imposion dangers. Good luck on a solution. Regards, Robert Greenstreet gstreet(a)indy.net ----------------------------------------------------- Message: 20 Date: Mon, 15 Jul 2002 09:16:45 -0500 To: cctalk(a)classiccmp.org From: Tom Uban <uban(a)ubanproductions.com> Subject: Re: CRT problem Reply-To: cctalk(a)classiccmp.org Hi Dave, I have a similar problem with a couple of CRTs from my Imlac graphics machine. After doing some research, the I did locate a company which would rebuild the CRT for something like $700, with no guarantee that they would not destroy the tube. They also had expensive replacement tubes, which were not the correct phosphor. Another solution, which I haven't tried yet is to remove the CRT from it's electronics and soak the face in a bath of acetone for an extended period of time (or until the secondary lens is separated from the tube. Once separated, clean and reattach using optic cement. This was suggested by a friend who repairs large antique camera lenses. I'm not sure if acetone will dissolve the cement which holds the lens to the tube, so a pre-test may be a good idea. Some people have indicated a fear of removing the lens from the tube face thinking that the tube may well implode without it. I do not think that will be the case, but I suppose that it is possible. I believe that the lens is simply added protect from day to day use for the face of the tube and is not inherently required to maintain the strength of the tube against the vacuum inside. In any case, as always, great care should be taken to protect you, your eyes, etc. when handling CRTs, as they do carry the risk of implosion. --tom At 10:18 PM 7/15/2002 +1200, you wrote: >I have a 10 or12 inch green screen CRT off an HP 9845B I need to clean up. . >It has been stored in a damp environment and the silicon rubber 'bonding' >the protective glass screen to the front of the CRT proper has developed >large mould spots in side itself for an inch or two around the outside edge >of the screen. I guess I am looking for suggestions as to how to readily >separate theses two glass items without scratching etc so I can clean and >rebond them. I thought at first there was a cavity between the glass on the >CRT face and the protective glass out front- just a seal of silicon rubber >round the edge- but no such luck-- seems like the silicon rubber stuff >covers the whole area of the tube face- so I need to chemically remove it or >?? >Any ideas?? > >The 9845B is running OK- getting a partial memory test failure at boot up >but I don't expect that will be too hard to sort. Anyway-- that's next >week's problem! > >Dave Brown >Christchurch, NZ

23 years, 8 months

help needed: problem with UNIBUS access on my PDP-11/70

by GOOI＠oce.nl

OK, the continuing story goes on to its conclusion. It looks I have been bit by the RX11 experiment. Some evenings ago I swapped the RX11 for an RX211 card, but I did not have the time to do some tests after the swap. Wish I did ... But first some replies to suggestions made. With the RX211 in slot 41, the DL11 in slot #40 and a M9302 + I can access the diags at 765000 on the M9312 successful + I can access the PROM at 773000 on the M9312 + access to CPU registers and MMR0-1-2 (777572 /4 /6) are all OK. + read/write the DL11 registers also OK! ??? I do not have a problem ??? Going back through my notes I see that the swap RX11 -> RX211 was the last action. So, back to the previous state: RX211 out, RX11 in. Guess what. The hung condition is back. The RX11 is a programmed I/O device. I knew that. But thanks to Tony's e-mail that older cards *do not* wire CA1 to CB1 if they do not use DMA, I checked the RX11. CA1 is not connected to CB1. That explains the hung. > It's OK to solder a wire (carefully) between the 'inside' > end of these fingers to make a DL11 (or whatever) that will > work in any slot. Some of my cards have been modified in > this way by the previous owner. I don't do that -- I fit the > wire-wrap jumper on the back of the backplane as DEC intended Again, Tony has the same thoughts I had yesterday. I did consider soldering a wire to the first 2 pins on the component side of the RX11 card. I did not. To make sure, I put the RX211 back in: all OK again. I made a note that slot 41 has the NPR wire on the backplane cut and that slot 40 has the NPR wired on the backplane. By experiment I will check the NPR wire of the other UNIBUS slots. You know why once you have seen the backplane of an 11/70. However ... (I will check this again) RX11 in slot 41 --> hung and we know why. RX211 in slot 41 --> all OK and we know why. G7273 double grant in slot 41 --> THE HUNG IS BACK! Huh?? Although the G7273 card puzzles me, I want to thank everybody for their contribution to solve this problem. I learned a lot from it. Also learned what that "SWR" column means in the M9312 manual. I had it right under my nose Johnny! It is even on my website in the tree "PDP-11/34A/CPU info/options/bootstrap". On that page all the ROM tables are listed including links. http://home.hetnet.nl/~tshaj kind regards, - Henk.

23 years, 8 months

lexbook arlington 10

by al＠thefox1049.com

I have a lexbook arlington 10, does anyone out their know where I can get a copy of the owners manual, factory software and especially any info on it's motherboard and manufacturer. lexmark quit all support long ago. note: I've expanded it to 16mb, 810mb hard drive, win 95b, it has 256 color 640x480 lcd. it has a 50mhz 486 slc2 with 25mhz bus, floppy drive, com port and parallel port. any info on the chip that goes in the blank spot for ethernet on board would be appreciated.

23 years, 8 months

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test-drb