test-drb September 2005

test-drb@ccmp.vtda.org

212 participants
437 discussions

DEC fast reader/puncher M705, 710, 715 card schematics

by sonnet＠sols.ucl.ac.be

Hi, Does anybody have the schematics for the pre-1971 versions of these : M715 C reader clock Flipchip card, M710 D punch control Flipchip card, M 705 D reader control Flipchip card ? While trying to connect my PDP-8/L to the PC04 fast reader/puncher, I realized that the schematics for the M705, M710 and M715 card posted by David Gesswein http://www.pdp8.net/pdp8cgi/query_docs/queryb.pl?level=1m-series;id=689 did not correspond to the ones I have. These are late "F" versions (1971). These cards include several DEC9801 one-shot TTLs as well as 7475 TTLs. My cards are 1969 versions and have no 9801 nor 7475. My cards have been somewhat modified by the former owner of the PDP-8/L. I have to understand what he did in order to repair them (most cards have to be repaired because an overvoltage episode killed about one third of the TTLs in my PDP-8/L) ! Many thanks, Philippe .

18 years, 9 months

leads for DEC logic lab

by jack.rubin＠ameritech.net

Here's a look at the leads for the logic lab: http://www.sideslip.net/dec_lab_leads/ They are basically mini-banana plugs. Note that they are stackable and have a "dec" logo molded on the side. Actual size of the plug is about 7/8" from top to tip; the plastic part is 1/2". If anyone has a spare manual, I'll trade a handful of leads for it! Otherwise, I'm in line with everyone else hoping for a good scan. Jack KC9HVE

18 years, 9 months

Fwd: Information about CD-ROM in the library of Computer Museum

by jfoust＠threedee.com

I gave them access to my ftp archive, and directed them to this list and to Bitsavers, too. - John >Date: Thu, 8 Sep 2005 20:31:40 +0000 >From: asbesto <asbesto at freaknet.org> >To: jfoust at threedee.com >Subject: Information about CD-ROM in the library of Computer Museum > > >Hi, > >i'm Gabriele Zaverio, president of FreakNet MediaLab, an italian >association dedicated to preserve computing history and working >to create a Museum of Working Machines :) > >we're actually working on a Data General Eclipse MV/7800XP >running AOS/VS, a very particular Operating System. > >Our problem is the total lack of any manual. So, searching >the net, i caught this page: > >http://www.threedee.com/jcm/library/ > >in which i read: > >"Two CDs of 20,046 pages > I've made contact with a guy who's scanned 20,046 pages of the > docs listed below, at 300 to 400 DPI. I keep these on CD-R." > >well, i'm really interested in those CD! :) > >i think we can made a sort of exchange - here we have many kind >of manuals, from Honeywell DPS-4 and DPS-6, to PDP-11/34 >internal schematics (including GAMMA-11 TAC Camera), and >other manuals like DG/UX for Data General Eclipse... > >as our goal, we want to put online every kind of documentation >we have, and we started scanning something. > >About our Eclipse, we have some stuff here: > >http://zaverio.net/eclipse/stuff > >as documentation, howto's and tape images and backups of >some part of AOS/VS, including help files and man pages. :) > >can you help ? i see you CD-ROM contains very interesting >manuals that can help us running this machine (our goal >is to make it available for users for experimenting it :) > >please help us, and tnx in advance > >Gabriele "asbesto" Zaverio >FreakNet MediaLab / Poetry > >p.s. we're from Palazzolo Acreide, a little town in >Sicilia, Italy! :) > >-- >[ asbesto : IW9HGS : freaknet medialab : radiocybernet : poetry ] >[ http://freaknet.org/asbesto http://papuasia.org/radiocybernet ] >[ http://www.emergelab.org :: NON SCRIVERMI USANDO LE ACCENTATE ] >[ *I DELETE* EMAIL > 100K, ATTACHMENTS, HTML, M$-WORD DOC, SPAM ] > >

18 years, 9 months

Vintage people: Google hires Vint Cerf

by news＠computercollector.com

http://www.wired.com/news/business/0,1367,68808,00.html?tw=rss.TOP ----------------------------------------- Evan Koblentz's personal homepage: http://www.snarc.net Also see: http://groups.yahoo.com/group/midatlanticretro/ Where did PDAs come from? http://www.snarc.net/pda/pda-treatise.htm *** Tell your friends about the (free!) Computer Collector Newsletter - 780 readers and no spam / Publishes every Monday / Write for us! - Mainframes to videogames, hardware and software, we cover it all - W: http://news.computercollector.com E: news at computercollector.com

18 years, 9 months

Debugging the HP37201 HPIB Extender

by ard＠p850ug1.demon.co.uk

I think this is on-topic here, it is well over 10 years old, it contains a classic-type microprocesosr, and I suppose it could be classed as a peripheral for a computer system (it's more commonly used to do remote-control of test equipment, but...) Note that I have a circuit diagram for this unit, but no service manual, so I couldn't interpret the self-test LED patterns. But I sorted it out by thinking about what had to be going on... To cut to the end, would you believe _another_ dead 2114 RAM chip.... -tony > The HP37201 is a unit that allows an HPIB (GPIB, IEEE-488) bus to be sent > over a serial connection. It supports various forms of the latter, > including asynchronous and synchronous modems and twisted-pair cable. > > Physically, it's a 2U rackmount unit. To get inside, remove the top and > bottom panels with the captive screws at the back. The right side panel > can then be removed in much the same way. To get the left side panel off, > remove the 2 screws at the ends of the handle, the plastic covers under > them, and the handle itself. The panel then slides off towards the back > of the instrument. > > Inside there is one large PCB filling most of the case. It contains a > 6800 processor, 8K of frimware EPROMs (either 8 off 2708, 4 off 2716 or 2 > off 2732, sleected by soldered links on the board, mine has the middle > configuration), 1K of RAM in 2 off 2114, a 6850 async serial chip, a 6852 > sync serial chip 5 off 6821 PIAs (1 for the diagnostic connector and > front panel LEDs, one for the GPIB data lines, one for the GPIB > handshake/control lines, one for the internal configuration switches and > GPIB control, and one for serial control and handshake lines), GPIB > buffers, RS232 buffers, and a bit of TTL. The latter is mostly for the > encoder/decoder for the twisted pair connector, but of course there's a > little for the GPIB port, system address decoders, microprocessor address > buffers, etc. > > The PSU is on the same board, but HP have been kind to people like me who > like to test it on dummy (or no) load first. There is a 12 pin (6 pin > double-sided) edge connector on the PCB. Some of the pins go to the PSU > outputs, others carry the power lines to the rest of the machine. In > normal operation, a little jumper PCB (no components, or even soldered > connections) is plugged in there. It can be removed to test the PSU > without the rest of the machine conencted. Incidentally, the marked PSU > testpoints are on the PSU side of this connector, and are thus useful > when the jumper is removed. > > The only other things in the case are the mains transfomer and associated > input connector and power switch, and a 'DTR OFF' changeover switch that > connects the DTR pin on the RS232 connector either to the DTR buffer > output or to another buffer output that is permanently at -12V. > > There are 2 DIP switches and a rotary switch on the PCB. The latter > selects the transmission mode/baud rate and self-tests. > > OK, so what did mine do. Well, in the process of fully dismantling and > reassembling it (not to be recomended if you don't like fiddling tiny > nuts into even smaller spaces -- the connectors are all soldered to the > mainboard and have to be unbolted from the back panel to get the board > out), I'd removed the 3 fuses from the PSU section of the PCB. There's a > 3A fusr for the +5V line, a 0.5A fuse for the +12V line, and another 0.5A > fuse for both the -12V and -5V lines. I put them back in suitable places > and powered up with the jumper pulled. > > The +5V and -ve lines were fine, the +12V line was missing. I quickly > traced this to a blown fuse. Since I'd not seen it blow when I flipped > the power switch, I replaced it, the +12V line now came up correctly. > > I fitted the jumper and powered up again. The -ve supply fuse flashed and > failed. I suspect.actually, the fuse I had put in the +12V holder had > originally come from the -ve one, it had failed long before I started > fiddling with things. A bit of checking showed that there was a short > from the -5V line to ground, and that a 75110 buffer (line driver for the > twisted pair cable) was getting rather hot. I desoldered it, replaced the > fuse, and tried again. This time the fuse held, and the instrument should > work for other-than-TP links without this buffer. > > Alas it didn't seem to be working. None of the LEDs came on other than > the power light (which simply runs from the 5V line). Fiddling with the > CTS and DSR lines had no effect on the associated LEDs (note : The 'link' > is in software, the RS232 lines are read via pins on one PIA, the LEds > are driven by another). More worrying still, at least one of the PIAs was > not being initialised, a pin that drives a select input on a mux to set > the async baud rate [1] was left configued as an input. > > [1] The async baud rates are quite clever. The unit can officially do > 150, 300, 600, 1200 baud. The 6850 can do either /16 or /64 between the > clock input and the internal bit clock, so one clock input frequency will > do for 300 and 1200, half of it would do for 150 and 600. There's a mux > that selects the appropriate output of a counter depending on the state > of a PIA pin. There's also a soldered link that would appear to double > all the baud rates, I've not tried it yet. > > I twiddled the rotary switch and powered up again. Now the first > interesting thing was that in 2 of the self-test positions I did get some > front panel LEDs on. So the CPU was clearly running. It could do enough > to intialise the PIAs, read the configuration switches, and drive the > LEDs. I'd already pulled the socketed EPROMs and dumped their contents. I > couldn't be sure it was correct, obviously, but they looked sane. > > One of the test positions was clearly a memory test (I forget the > labelling). Now, for very good reasons, namely that they were 2114s, I > suspected the RAMs. Getting to them is not easy, they're at the very > front of the board, partly hidden by the front casting. So I had to get > that out of the way first. > > Disconnect the DTR OFF wires at the back of the PCB (note the order, they > are not marked on the PCB). Pull the cable through the grommet, undo the > 2 screws and nyloc nuts holding the cable clips to the right side > casting. Prise off the trim strip at the top of the front casting, remove > the 6 screws holding the front panel. Pull that forwards, remove the 2 > screws holding the mains swtich to the back of it, then remove the front > panel. Don't worry about the lack of the DTR OFF switch, you don't need > the DTR pin to sort out the memory. > > With the front panel out of the way, the front casting comes off with the > 4 corner screws.. > > OK, I desoldered the RAM, and fitted 18 pin DIL sockets. With no RAM > chips at all, I got a different set of LEDs on the memory test > (interesting, at least it was doing somethign with the RAM). Putting the > RAMs back gave the old pattern, putting them back the other way round > (swapping which chip stored each nybble) gave a different pattern. > > Had the RAM been working correctly, swapping them would have made no > difference of course. So it was likely I had a RAM fault. > > I found an old Apple 80 column card with some socketed 2114's on it. > Pulled a couple and put them into the 37201. Powered up. Got yet another > patten from the memory trst. The self-test now gave a patten of flashing > LEDs (test-complete alternating with all the others). The 'operating' > modes now gave a single LED on, which indicated 'remote signal lost' -- > not suprising as I had nothing connected to it. More usefully, the RS232 > handshake pins now did affect the frontpanel LEDs, the baud-select pin > from the PIA was now driven correctly. > > Trying the origianl RAMs back one at a time proved that only one was > dead. > > Still to do : Get a new 75110 driver chip for the TP interface. And > investigate the lowest hardware test, which doesn't even use the firmware > ROMs, with a logic analyser

18 years, 9 months

leads for DEC logic lab

by wacarder＠earthlink.net

> On 9/8/05, Jack Rubin <jack.rubin at ameritech.net> wrote: >> Here's a look at the leads for the logic lab: >> http://www.sideslip.net/dec_lab_leads/ > >> If anyone has a spare manual, I'll trade a handful of leads for it! >> Otherwise, I'm in line with everyone else hoping for a good scan. > > I've been following the discussion because I've wanted one of these > since I saw the Teacher's Guide at age 13. What I'd love to see are > some internal construction details of the Logic Lab. Can anyone snap > a few shots? > > -ethan I'll take the back off one of mine some time and take some detailed pictures of the insides of the thing. Question: Is the Logic Lab the same thing as the Computer Lab? Mine are Computer Labs. Ashley

18 years, 9 months

leads for DEC logic lab

by wacarder＠earthlink.net

> Here's a look at the leads for the logic lab: > http://www.sideslip.net/dec_lab_leads/ > > They are basically mini-banana plugs. Note that they are stackable and have > a "dec" logo molded on the side. Actual size of the plug is about 7/8" from > top to tip; the plastic part is 1/2". > > If anyone has a spare manual, I'll trade a handful of leads for it! > Otherwise, I'm in line with everyone else hoping for a good scan. > > Jack > KC9HVE Jack, The patch cables that came with my two DEC Computer Labs are not like yours. They are like Phillippe's and are not stackable. Maybe yours are a later version(?). Ashley

18 years, 9 months

datasheets for 82S21 - Signetics 32x2 SRAM?

by h.j.stegeman＠hccnet.nl

Hi Tony, I have the complete datasheet of this highspeed RAM. Still need it ? Henk IBM collector. http://home.hccnet.nl/h.j.stegeman

18 years, 9 months

VINTAGE COMPUTER FESTIVAL 8.0 NOV 5-6

by vcf＠siconic.com

A>PIP TTY:=VCF8.DAT ______________________________________________ / \ \ | | | \__/| * VINTAGE COMPUTER FESTIVAL 8.0 * | | | | NOVEMBER 5-6, 2005 | | COMPUTER HISTORY MUSEUM | | MOUNTAIN VIEW, CALIFORNIA | | | | HTTP://WWW.VINTAGE.ORG | | | | * * * | | | | AT VCF 8.0 YOU WILL: | | | | * SEE OLD COMPUTERS | | * SEE PEOPLE TALKING ABOUT OLD COMPUTERS | | * SEE PEOPLE SELLING OLD COMPUTERS | | * . . . AND MORE!!! | | | | | | COME JOIN THE FUN AS WE CELEBRATE THE | | COMPUTERS OF YORE ALL OVER AGAIN. | | | | | | * EVENT NEWS AND INFORMATION | | * VCF 8.0 BBS | | * EXHIBITORS WANTED! | | | | HTTP://WWW.VINTAGE.ORG/2005/MAIN/ | | | | | | __________________________________________|__ |/ \ \ | | | \__/__________________________________________/ -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

18 years, 9 months

datasheets for 82S21 - Signetics 32x2 SRAM?

by h.otten＠chello.nl

Date: Wed, 7 Sep 2005 22:27:16 +0100 (BST) From: ard at p850ug1.demon.co.uk (Tony Duell) Subject: Re: datasheets for 82S21 - Signetics 32x2 SRAM? To: cctalk at classiccmp.org Message-ID: <m1ED7Ru-000IyXC at p850ug1> Content-Type: text/plain > > > Does anyone have a datasheet for an 82S21? I checked all the obvious > places but can't find one. > > 82S21 - Signetics 32x2 SRAM I have the datasheet, 3 pages, in the Signetics Data book. Let me know if you want a scan. Hans

18 years, 9 months

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test-drb September 2005