test-drb

test-drb@ccmp.vtda.org

101090 discussions

by dario.rodriguez＠edc.ericsson.se

Hello Team Excuse me, but the Christian Fandt e-mail address have not been available could Somebody help me please???? Thank you very much for your attention. Best Regards Dario Rodriguez. ================================================================================================== Hello Christian Fandt, I hope you are ok.. My name is Dar?o Rodriguez and I work at Ericsson de Colombia Repair Center.I am in charge of equipment maintenance. We have a equipment which is controlled by a Hewlett Packard calculator reference: HP 9825B that we looked at your web site http://www.classiccmp.org/mail-archive/classiccmp/2000-08/0176.html We will really appreciate you help us to know if is still available to buy this unit, because our calculator is not working very well now, and one new could be better to us,or if it is not available, maybe, could you please help us to know if this calculator is replaced by other one?, In the past we tried to replace this one by a Computer interface, but It have not been possible, do you know where do we find information about this process?, Thank you very much for your attention, We will expect your comments about this matter, Best Regards Dario Rodriguez.

23 years, 8 months

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

by GOOI＠oce.nl

Reading the replies, not from the screen, but printed, I notice a comment from Tony. This could be important! > Of course you might still have an open NPG jumper on the slot > where the DL11-W is (this card does not short CA1 to CB1). That's an eye-opener for me! I thought that the DL11 would short CA1 to CB1. I guess that some cards that do not use DMA (NPR) short these 2 pins and some *do not*. Since the machine was originally with a remote console, (hard lesson: DO take notes on any action you do to a PDP-11, if you do: make better/more elaborate ones), I think that there was no DL11 in it, but the Unibus serial remote console M8255 was in slot #40. I swapped the M8255 for an M7856. Now, if the M8255 *does* bridge/use NPR ... I will check this evening of course, no matter what pops up! I will do the other tests anyway, and make notes! They will be very useful for future reference. Again, thanks all so far, - Henk.

23 years, 8 months

[CCTECH]74123 woes

by frustum＠pacbell.net

I've been working on trying to get a Sol Helios disk system up and running so I can recover and archive a bunch of disk images. If I can't get it working (I'd really like to get it running for its own sake), I'll get a catweasel card, a conventional 8" disk, and attempt to write my own bit-level decoding software to recover the disks. Anyway, I found and fixed the first problem: one of the satellite circuit boards on the persci had a tantalum cap that had a dead short, taking out the whole +24V power supply (it used a 3-terminal rgulator that detected the problem and cut off power, thus there was no pop nor any telltale burnt traces or wires). I fixed that and things are working somewhat better, but I still can't seek to any track except 0 (via the restore line). After discovering that the schematics I have are for a somewhat different revision of the logic board than I have (doh!), I tracked down the problem to what appears to be a busted 74123 (not LS123, which is slightly different logically). The positive trigger is always high, and the Q-bar output is always low -- that is, the thing looks like it is always triggered despite the fact that there is no edge on the trigger input. I could remove the 74123, replace the resistor and cap and see if that fixes it, but doing it would require a lot more disassembly than I'd like to do without being confident that what I'm seeing really is a problem. Here is where I need advice. I can't find my TTL databook, but it would appear that the trigger inputs are edge triggered, not level triggered, right? Secondly, I haven't done board-level design in more than 10 years, but from what I recall, 99 times out of 100 when I thought I had tracked down a bug to a back chip, it was something else (then again, that was during design, not just working on ostensibly correctly designed boards). I have little experience with the '123 since using one for any timing critical function simply hasn't been kosher for the past 20 years at least. Does anybody know in such a situation like this, is it more likely to be a bad cap or a bad '123, or a short somewhere else on the trace? I can measure the resistance of the R and it is in spec. I've buzzed the circuit to see that the R and C are connected to the pins of the '123. Any other suggestions? Oh, the C is a mylar (I think) with a 5% precision rating stamped on it (100pf). Thanks. ----- Jim Battle == frustum(a)pacbell.net _______________________________________________ cctech mailing list cctech(a)classiccmp.org http://www.classiccmp.org/mailman/listinfo/cctech

23 years, 8 months

Interesting Apple ][ card

by foo＠siconic.com

I found a few interesting cards for the Apple ][ the other day. On it are the markings "Computer Networking Specialists" with a copyright of 1988. It has two whole chips: a 6116 and a PAL. The remaining components are three caps, one which has blown. In fact, of all the cards I found, they all have the same cap blown, in some cases completely obliterated with only the two leads remaining with only a huge swath of soot in the path of the explosion. The cap seems to filter the ground line (it goes from what I believe is the GND pin on the ICs to the ground plane on the card). Each computer with the card had a cable with an RJ-45 connector on one end and a four-pin flat connector on the other protuding from the case. I found other computers without the card but with the cable. The inside end of the cable (with the 4-pin connector) was loose. There is no mating connector on the card for it either. It seems to me that these computers were part of some network scheme, and that these cards possibly held some networking firmware. How the cap blew off the cards is a mystery. I could imagine a power spike coming down the network cable and damaging the card, but like I said, the cable didn't plug directly into the card, and I can't imagine the Apple ][ bus passing along a power surge to the card from the cable. I didn't bother to check any of the Apple's that I pulled the cards from to see if they were working. Anyway, anyone have any knowledge of these? Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org * Old computing resources for business and academia at www.VintageTech.com *

23 years, 8 months

HP 9133H Configuration switch?

by glenslick＠hotmail.com

Thanks for the config switch info. The 9133H unit I picked up came with the config switch in position 8 and I originally formatted it on the IPC with 8 volumes. Maybe there is a limit on how many volumes the IPC can mount at the same time? Only the first 6 volumes appeared to be mounted automatically. I change the config switch to position 2 and reformatted the drive as 2 volumes and that seems like it might be a better choice. What controls the 256/1024 byte sector size? Is that up to the OS format routine? Is there a CS/80 or SS/80 spec available anywhere to find out more about how these HPIB drives work? Are there any other sources of software for the IPC besides Pete's IPC website? http://www.coho.org/~pete/IPC/integral.html Now that I have a hard drive I don't really have anything interesting to load on it yet. -Glen _________________________________________________________________ Join the world’s largest e-mail service with MSN Hotmail. http://www.hotmail.com

23 years, 8 months

Intel 8291 was Re: semi-OT

by rigdonj＠cfl.rr.com

The 8291 is a GPIB Talker/Listener IC. It's in Volume II of the 1985 Intel Microsystem Components Handbook. I have Vol I but not Vol II so I can't give you any details about the part. Joe At 11:40 AM 7/12/02 -0500, you wrote: > >I've also removed an Intel P8291A, which has been just as hard to find >information on, anything would be useful. > >Thanks! > >-- Pat > >

23 years, 8 months

semi-OT

by pat＠purdueriots.com

I've 'rescued' a stack of HM6116LP-3 SRAM's from a circuit board. Apart >from the fact that they're 2Kx8 SRAM's, I haven't been able to find any useful datasheets with both pinouts and timing diagrams for the chips. By any chance, does anyone have one laying around in PDF or that they'd be willing to scan? Minimally, I'd like to know the pinout, basic timing requirements, max clock speed, and data retention voltage. I've also removed an Intel P8291A, which has been just as hard to find information on, anything would be useful. Thanks! -- Pat

23 years, 8 months

Mark-8 *Faints*

by groovelists＠yahoo.com

'Evening all! :) I don't quite know what to say... I suppose I just wanted to tell some people. I'd purchased a computer on ebay listed as, "another VERY EARLY HOMEBREW COMPUTER," a while back for $9.00. It didn't come in a bit over a month... I contacted the owner and waited some more, but had pretty much given up hope on it. It arrived today... I peered about inside... It appears to be a Mark-8. Has at least the same CPU board... I came very close to thumping onto the floor... It has a homebuilt case... it's about sewing machine sized. It has 8 ports of some type, a tape port, a control port. Inside, it has the CPU board, some input type board, some output type board, a board labelled add, and 2 1011 1k memory cards, all attached to a homemade bus. I know it is missing at least a 74xx something chip and the power supply, but... I'll put up pictures of it sometime in the next day or two. Thanks for hearing me rant! :) Oh yes! Thanks, too, to the kindly people who helped me out with the AT&T 3B1 - your help was so very appreciated! :) Andy ___________________ grooveman(a)yahoo.com __________________________________________________ Do You Yahoo!? Yahoo! Autos - Get free new car price quotes http://autos.yahoo.com

23 years, 8 months

Laserjet IIIp in Ohio

by paulrsm＠buckeye-express.com

Someone was asking about paper trays for a LaserJet IIIp in Ohio. I have a half-dozen broken LaserJet IIp's and one IIIp for parts, including the paper trays. I live just north of Toledo. Contact me if you still need it. -- Paul R. Santa-Maria Monroe, Michigan USA

23 years, 8 months

[CCTECH]PDP11/23 and Emulex Qbus Controller

by Andreas.Freiherr＠Vishay.com

Pierre, maybe someone else will provide practical experience with the combination QD32 & 11/23, but my first guess would be that bandwidth is not a problem: as long as all devices on the bus obey all the bus specifications, they should be compatible. Was your friend possibly talking about address width (in other words, the number of address lines on the bus)? - There are three variants, with 16, 18, or 22 address lines. Incompatibilities can arise if a *DMA controller* drives *less* address bits than the system actually uses. Non-DMA controllers have no problem because they never address memory themselves. A typical problem of this type is the RXV211 (RX02 floppy disk controller: DMA, 18 address bits) used in a 22 bit system. The problem can be circumvented in driver software by reserving a buffer area in the lower 256kB of main memory. IIRC, older versions of the 11/23 drive 18 address lines, making them capable of using up to 256kB (or 128kW) of memory. Later models (in particular, the 11/23-PLUS) supply all 22 possible address lines, allowing for up to 4MB (2MW) of RAM. I was told several years ago that some /23s can be upgraded by adding a couple of wires (and maybe a handful of bus drivers). The QD32 is no doubt a DMA controller, but I think I know it is 22 bit. Hence, it should be possible to use this controller in any Qbus system. Also IIRC, the QD32 uses MSCP to communicate with its driver software, so it should not even require any special software: a vanilla DU driver would be OK for RT-11 or RSX-11, for example. Anyone have better information to correct me? Regards, Andreas P.Gebhardt(a)gmx.de wrote: > Hello, > > is it possible to use an EMulex QD32 Controller (Qbus) with a PDP11/23 ? > I asked a friend and he told me that the bandwith of the bus could be > drifferent. > Is it right ? > > Greetings > > Pierre -- Andreas Freiherr Vishay Semiconductor GmbH, Heilbronn, Germany http://www.vishay.com _______________________________________________ cctech mailing list cctech(a)classiccmp.org http://www.classiccmp.org/mailman/listinfo/cctech

23 years, 8 months

Peek65 magazine, March, 1985

by Lee.Davison＠merlincommunications.com

Does anyone have a copy of this magazine or know where such can be found? Lee. ---------------------------------------------------------------------------- ---- This email is intended only for the above named addressee(s). The information contained in this email may contain information which is confidential. The views expressed in this email are personal to the sender and do not in any way reflect the views of the company. If you have received this email and you are not a named addressee please delete it from your system and contact Merlin Communications International IT Department on +44 20 7344 5888. ________________________________________________________________________ This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________

23 years, 8 months

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

by GOOI＠oce.nl

Hi Eric. Yes, very strange indeed. The G7273 is placed in slot positions C & D, the correct way. Edward suggested to use the Ohmmeter and check for a very fine disconnect on the etch of the G7273. The etched wire is indeed quite thin, I remember from yesterday. We'll see this evening ... - Henk. > -----Original Message----- > From: Eric Smith [mailto:eric@brouhaha.com] > Sent: dinsdag 16 juli 2002 10:43 > To: cctalk(a)classiccmp.org > Subject: RE: help needed: problem with UNIBUS access on my PDP-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?? > > Very strange. You've got the G7273 in the right slots (C&D)? And > not upside-down? If it's inserted correctly, it can't help but pass > the grants through!

23 years, 8 months

"modern" CP/M system?

by archer＠topnow.com

Hi, I noted off a link on this list that somebody had implemented a "modern" CP/M SBC based on the Z180 CPU. This, unfortunately, is no longer being made. With the rise of retrocomputing (The new IMSAI and the upcoming Commodore C=1 come to mind), I was wondering if anybody knew of at least a PCB solution with a ready-made CP/M port? Also, are there any good "CP/M internals" books I should be looking out for in the used bookshops? Preferably with enough detail to understand what's needed to do a port? P.S.: I'd love to see CP/M running at 20+ Mhz. :) -- Ross

23 years, 8 months

NPR and the RX11 (was Re: help needed: problem with UNIBUS access on my PDP-11/70)

by mbg＠TheWorld.com

The RX11 isn't DMA... when you give a command, it reads to a silo which the driver has to dump, a character at a time, or writes the silo which has been written, a character at a time... I just checked the RT-11 RX01 driver source to confirm it... 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

OT: MECOS frequency device ?

by dwightk.elvey＠amd.com

Hi It might be some kind of bearing failure detection devise. The switches would be to select the frequency to listen at. In a large shop, with a lot of machines running ( like a printing press ), one needs something check each bearing to see if it about to fail. When a bearing is just starting to go bad, it growls. The frequencies mentioned are in the range one would expect for larger bearings. Dwight >From: "Lawrence Walker" <lgwalker(a)mts.net> > > No the LED is in the chassis. I started thinking it might be some sort of heart >device timer as the deceased former owner of the auctioned items was quite >elderly. I guess you could use it as a timer strobe. > >Lawrence > >> On Thu, 11 Jul 2002, Lawrence Walker wrote: >> >> > Likely way off topic, but I acquired some sort of frequency device in >> > an auction junk box. It's a well machined device made by MECOS, made >> > in W.Germant. It's about 2" square by 1/2" powered by a Li. battery >> > and has micro-switches labelled 3 hz, 7.8 hz, 14.0 hz and a small led >> > that flashes at the selected frequency. Anyone have any idea what it >> > might be ? >> > >> > A search turned up that MECOS makes Active Magnetic Bearings and >> > control boards and programs. >> >> Could this be some sort of timing device used for calibrating the speed of >> something? Is the led separate from the chassis? >> >> -Toth >> > > >lgwalker(a)mts.net >bigwalk_ca(a)yahoo.com >

23 years, 8 months

book finds

by carlos_murillo＠epm.net.co

I went to Bogota this weekend and found some good books, including: -VAX Architecture Reference Manual (1987) -Samuel Seely, Electron Tube Circuits, 2nd. Ed., McGraw-Hill (1958). This book is a gem. I saw it once at a library a long time ago and had been looking for it ever since. -A. Khinchin, A Course of Mathematical Analysis, translated from the 3rd. russian ed. and published by Hindustan Publishing Corp., Delhi, India. Not CC related but a real find. I paid less than $3 for all three books. Something to calm the collecting itch for a few days :-) . -------------------------------------------------------------- Carlos E. Murillo-Sanchez carlos_murillo(a)nospammers.ieee.org

23 years, 8 months

can someone ID a DEC board?

by mbg＠TheWorld.com

Checking my bible... M8719 Unibus to D-Bus cable (I/O Daisy chain bus) control and interface. Where used = IP112 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 | +--------------------------------+-------------------------------------+ p.s. Looks like another one to make sure I include in the update to the field guide, which I'm working on...

23 years, 8 months

can someone ID a DEC board?

by pat＠purdueriots.com

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2038627297 Seller says it's an m8719, and that's not listed in the Unibus/QBus handbook of cards. Any idea what this is? -- Pat

23 years, 8 months

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

by GOOI＠oce.nl

Thanks all for the many good replies. This is what I have done so far. At the end is what I did *not* do (yet). At first, I kept the 3 MASSBUS interfaces installed. They were in the machine, so I did not suspect them. - I installed the H744 in the upper PSU. All +5, -15 and +15 V. all look OK, measured with a Fluke. I am not yet in the stage to pull out the scope and do "difficult" things. - I will check the jumper on the M8132. Normally I make notes of steps I do on my machines, but Murphy is still alive. I cleaned the 11/70 with remote console *completely*. Got the 11/70 with full console 2 weeks later. Since I am keeping one and donate the other 11/70 to a museum, I did not want to clean the second 11/70 also. The guy at the museum may do his share of this bargain. So I swapped the consoles, and (AFAIK) the boards. That is the problem: I can not remember that last action. Perhaps I did not swap all CPU boards between the 2 machines and only moved the FP option boards (and forgot/didn't know about the H744 to supply +5V to slots 2-3-4-5). As Tom wrote, the 11/40 indeed needs on 2 boards (IIRC) change of jumpers for FIS/EIS (or was it MMU)? - I kept a G727 in the 4th MASSBUS slot at the correct position. Removed from all not used UNIBUS slots the G727 and replaced them with G7273 dual-height grant cards. Result is still NOK: hung on console address access (read/write). - Removed the other 3 MASSBUS interfaces. Put a G727 instead of the M8153, according to FMPS. Hung remains. - The "golden" tip from Tony. Removed the M9302. No more hung! XBUF status shows octal 200 (indicating TX buffer empty, ready to receive byte to transmit). Store octal 71 in the TX buffer and a "9" appears on the VT320!! Basically, I have a complete working machine, but ... - Put an M930 as terminator in the 11/70. Still all is fine. - Put an onther M9302 (from the working 11/34C) in the 11/70. The hung is back. - Put the M930 back in again. LOADed address 17765744 (from the M9312 manual) and pressed START. All LEDs flicker for a few seconds, then all go off, except ADDRESS LED #2, so address 00000004. I guess this is a TRAP because the boot device was not accessible. Makes sense, there are no devices connected! What I did not do. - Remove the RX11 (non-DMA) RX01 interface and replace it with an RX211 (DMA) RX02 interface to see how that affects the NPR line. - Did not check the ACLO and DCLO signals. Since I can run "a small program", memory interconnections, the memory and the CPU itself have no apparent problem. - Did not try to read the ROM on the M9312 with the M9302 installed. Will do that this evening (probably). The weekend was shorter than I expected it to be. As usual ... I did read the CPU registers (IIRC), but check on that again. - I will read the M9312 manual again. The numbers Johnny writes about sound familiar. However, it this moment I do not have any disks (RX,RL) connected. Thanks again so far, - Henk.

23 years, 8 months

Documents need (bounty $$$)

by foo＠siconic.com

I have a bounty outstanding for the following: Early 1990s data sheet for the HP HCPL-7800 Isolation Amplifier Government Microcircuit Applications Conference (GOMAC) Proceedings for 1986 & 1990 If you have these, please contact me directly <sellam(a)vintage.org>. Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org * Old computing resources for business and academia at www.VintageTech.com *

23 years, 8 months

[CCTECH](no subject)

by P.Gebhardt＠gmx.de

Hello, is it possible to use an EMulex QD32 Controller (Qbus) with a PDP11/23 ? I asked a friend and he told me that the bandwith of the bus could be drifferent. Is it right ? Greetings Pierre -- GMX - Die Kommunikationsplattform im Internet. http://www.gmx.net _______________________________________________ cctech mailing list cctech(a)classiccmp.org http://www.classiccmp.org/mailman/listinfo/cctech

23 years, 8 months

"modern" CP/M system?

by healyzh＠aracnet.com

> P.S.: I'd love to see CP/M running at 20+ Mhz. :) > > -- Ross You could always try CP/M-86 then, I've had it up around 266Mhz. Zane

23 years, 8 months

CRT problem

by pete＠dunnington.u-net.com

On Jul 15, 9:16, Tom Uban wrote: > Hi Dave, > > 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. If the substance bonding the front glass to the the CRT is some sort of RTV silicone compound, you might be able to remove it with silicone sealant remover. I don't know exactly what's in that stuff, but plumbers use it to remove old silicone sealant from shower panels, tiles, and fittings. You might be able to get it from a plumbers' supplier. -- Pete Peter Turnbull Network Manager University of York

23 years, 8 months

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

by pete＠dunnington.u-net.com

On Jul 15, 10:14, Gooijen H wrote: > - The "golden" tip from Tony. Removed the M9302. > No more hung! XBUF status shows octal 200 (indicating TX buffer > empty, ready to receive byte to transmit). Store octal 71 in the > TX buffer and a "9" appears on the VT320!! > Basically, I have a complete working machine, but ... > - Put an M930 as terminator in the 11/70. Still all is fine. > - Put an onther M9302 (from the working 11/34C) in the 11/70. > The hung is back. I got caught by that exact same thing a few months ago, and once again it was Tony who reminded me of what I once knew: the 9302 makes it hang if the grant chain is broken. I was tidying up an 11/34 which I was trading to a friend, moved some boards, forgot an NPR jumper, and spent two days trying to figure out why the RUN light came on and I couldn't HALT the CPU. -- Pete Peter Turnbull Network Manager University of York

23 years, 8 months

[CCTECH]74123 woes

by dwightk.elvey＠amd.com

>From: "John Honniball" <coredump(a)gifford.co.uk> > >Jim Battle wrote: >> Anyway, I found and fixed the first problem: one of the satellite circuit >> boards on the persci had a tantalum cap that had a dead short, taking out >> the whole +24V power supply... > >Yes, that's a typical failure mode for tantalums! > >> Secondly, I haven't done board-level design in more than 10 years, but from >> what I recall, 99 times out of 100 when I thought I had tracked down a bug >> to a back chip, it was something else (then again, that was during design, >> not just working on ostensibly correctly designed boards). > >Until recently, I'd have blamed something other than a 74 logic chip >just going bad. However, I've seen a few chips do just that in RL01 >disk drives, which must be about the same age as your chips (late >1970s.) > >So, I'd say it's possible that the 74123 has just ceased to function >"all by itself". Due to age, that is, not due to external factors. >In the end though, it's up to you to decide whether you suspect chip >failure enough to warrant replacing it (with all the associated taking >apart, soldering and putting together again). > Hi The capacitors used with 74123's tend to fail over time because they are slightly back biased at the of the discharge part of the cycle. This does in tantalums and electrolytics, over time. Non-polar parts are usually OK. Dwight

23 years, 8 months

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