test-drb

test-drb@ccmp.vtda.org

101090 discussions

by cc＠corti-net.de

Hi, A friend of mine needs to repair the power supply of a TRS-80 Model II. I've found a schematic but without part numbers and values! He needs to know the type of transistor Q1, there are no markings on the case of the transistor. I've checked the power supply of my Model II, and there are no markings, too. The Technical Reference Manual has all schematics for the Model II, but the schematic for the power supply is useless without component values. Might a BU208 for Q1 do the job? Christian

19 years, 10 months

Ancient Genrad system

by kahrs＠caip.rutgers.edu

Looks like this contains tasty tidbits but it's too far away from me: http://cgi.ebay.com/genrad-2294-central-station_W0QQitemZ320017707724QQihZ0… At a minimum, it has some really deluxe 8" drives.

19 years, 10 months

stack smashing Was: Re: Scanning Formats (TIFF vs. JPEG)

by aliensrcooluk＠yahoo.co.uk

--- Chuck Guzis <cclist at sydex.com> wrote: > On 8/19/2006 at 12:49 AM Alexey Toptygin wrote: > > >This is computationally expensive and complicated . > Every time you have to > >cross a privilege boundary you have to switch > context, validate any data > >going across and verify permissions. You also nee d > an exact specification > >of the interface for every such interface - if th e > system doesn't know > >what your DLL is allowed to do, how can it stop i t > from doing what it > >shouldn't? This is why this sort of pain is usual ly > reserved for the > >user-kernel interface. > > I don't think so. There is a subset of all DLLs > that can be classified as > "trusted"--they know to check arguments and the > operation is well-defined. > One might classify these as "friendly" DLLs and om it > any sort of checking. > For all others, the calling program can specify a > tighter degree of control > at the expense of more overhead. > > Cheers, > Chuck > How is the checking done? If it's purely by name then it can easily be switched for something much nastier without the user finding out. There used to be a fake "datatypes.library" for Workbench 3 on the Amiga. Instead of containing various datatypes functions/data (say for JPEG's, GIF's and IFF's etc.) it was a nasty virus. Personally I prefer Workbench 2 and have mine set up with my own custom icons and mouse pointers :) NB: For those that don't know, Workbench is the Amiga version of Windows - or should that be Windows is the PC version of Workbench :) Regards, Andrew B aliensrcooluk at yahoo.co.uk

19 years, 10 months

PDP-7 instruction set and hardware documentation

by spectre＠floodgap.com

Does anyone have documentation on the PDP-7 instruction set and hardware? I know that the PDP-7 is a superset of the PDP-4, but I can't even find much on what instructions the -4 supported (let alone the extended memory and device control operations). A Google session this morning was not useful. -- --------------------------------- personal: http://www.armory.com/~spectre/ --- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com -- Do not innovate unnecessarily. -- "The Tick" -------------------------------

19 years, 10 months

11/34 failing trap test

by ISC277＠CLCILLINOIS.EDU

Okay, I got the 11/34 up and running, and I loaded XXDP. It fails the trap test. The instructions state you should examine the stack pointer (777706) which shows it to be a value of 000470. This is supposed to tell you the address of the Program Counter, right? So I load address 470, and the value is 000330. What instruction is failing? Am I reading this right? Any help, as always, much appreciated. Thanks! Julian

19 years, 10 months

LSI 11/2 question

by pete＠dunnington.plus.com

On Aug 17 2006, 20:31, Scott Quinn wrote: > An PDP-11/03 processor, LSI-11 quad-height M7264EB (does anything > go out over the C/D fingers, or are they just there for stability?) I'm not sure exactly what version that is but it does supply refresh for the memory, although only the very earliest memory boards actually need that -- in fact your MSV11-B is the only one I can think of that does -- and it's sometimes disabled. W4 controls that, it's inserted to *disable* it. And that board possibly has 8K bytes of memory on it already, which needs the refresh enabled. Are the five MICROM sockets right at the edge of the board, or is there some circuitry just to the left of them? The former is KD11-F, the latter is KD11-J. Usually the former has on-board memory, usually the latter does not. If there's a 23-003B5 chip in the leftmost socket, you have the optional KEV11, which contains the EIS/FIS instruction set. You didn't mention -- or I missed it -- what backplane you have. I'm guessing it's a "straight" backplane like an H9273. If so, what the LSI-11 puts on the C/D fingers shouldn't matter, unless you put something immediately below it that dislikes the LSI-11. I don't think there's anything untoward on C/D, though, because they can be used in "serpentine" backplanes like the H9270 used in the small BA11-M box for small 11/03 systems. > DHV11-A 8-line async serial Interesting; that's a slightly later vintage than the other parts. > RXV11 (forgot the V originally...) That will need an RX01 (or an RX02 with the switches set for RX01 emulation) dual 8" floppy drive. > either MSV11-B 4k RAM This one needs the refresh control signal from the LSI-11. > or MSV11-PL 256K ram (18-bit, but will the LSI-11 just ignore the > extra or will it futz up?) The 18-bit designation for the memory means that it has two parity bits as well as the 16 data bits, and the processor will ignore that. Actually, the MSV11-P has it's own parity CSR so some OSs might be able to use it. It might not work because the extra address lines may not be held at the right level -- the 11/03 only has 16 address lines and no memory management, and it puts some extraneous signals on the top 4 address lines -- but although the MSV11-P supports 22-bit addressing, it also works in 18-bit systems, so it's worth trying and it shouldn't do any harm to try it. If it does work, you'll end up with 56K bytes of usable memory, because the top 8K byte page is reserved for I/O. The 16/18/22-bit designations can be confusing when you're talking about memory, because they normally refer to the size of the address bus and hence the address range. An 11/03 (and any CPU using an LSI11 or 11/02) has only 16-bit addressing. An 11/23 may be 18-bit or 22-bit, later processors are 22-bit. However, 16-bit and 18-bit are sometimes used in the contect of memory to refer to the data bus width: 16 bits with, or without, two parity bits. > Am I getting in too deep for a first-go at a PDP-11? I wouldn't say so. It's a fairly simple machine, as -11s go. You want to see if you can acquire some of the DEC handbooks for those systems, such as the 1976 "Microcomputer Handbook" and perhaps the 1978-79 "Memories and Peripherals Handbook". Other useful ones are the 1982 "Microcomputers and Memories" handbook (doesn't say quite so much about the LSI-11, though, but it does list the jumpers and etch revisions etc), 1980 "Microcomputer Interfaces Handbook", and 1983-84 "Microcomputer Interfaces Handbook". Plus, of course, you should see if you can get any of the engineering drawings as they too contain a lot of useful information. -- Pete Peter Turnbull Network Manager University of York

19 years, 10 months

11/34a failing trap test

by fireflyst＠earthlink.net

19 years, 10 months

first Classics (WAS Apollo DN systems)

by compoobah＠valleyimplants.com

The DN discussion left me thinking about how classic computer collecting was presented to the outside world. One of the things that stood out rapidly was that I would not recommend an Apollo as a first foray into the classic world (I know that in this circumstance it isn't a first foray, just thinking in general). So, I started thinking about what would be a good starter system. So far, I've come up with Sun-3 or Sun-4 (good availability of information, easy software accesablilty (NetBSD works well, Solaris/SunOS isn't bad if you can find it, although Sun licensing is the strictest of all the options here, with no transfers allowed). Open hardware, easy-availability of parts and upgrades. Headers come with, SunOS 4 comes with cc. Silicon Graphics IRISes of the ARCS era. Goodly amount of information (sgistuff.g-lenerz.de and futuretech are put out/aided/etc by listmembers yay!!) Software is harder to come by, NetBSD isn't very well supported on these beasts and IRIX is pricy (but the license transfers with the machine). Compilers available for 5.3, headers for 6.2 and 6.5. Parts are available readily for many classic IRISes, less so for the biggish-iron (ultramicros? what would you call those...) machines or newer machines. High cool factor. I ruled out IBM (non-PCs) because of software and some unusual hardware choices, DEC due to hard-to-find hardware parts on VAX and the highly confusing mess with Alpha (play the "will my machine run VMS or Tru64" game - step right up, watch the pea...) Apollo because of hard-to-find S/W and limited information on the net. HP 9000 could be a contender, too. - good NetBSD support, (currently) free HP-UX, good online documentation, well-built machines. You'll note this is pretty much limited to UNIX workstations, because of my space limitations and my assumption that UNIX will make for a easier transition. Any other ideas?

19 years, 10 months

Mitsubishi Monitor

by statn1＠earthlink.net

Here is our E-MAIL address for response on Mitsubishi Monitor statn1 at earthlink.net

19 years, 10 months

Mitsubishi Monitor

by statn1＠earthlink.net

I have a need for this monitor. It is used on a measuring system. It is not used with todays PC's, Mac or otherwise. I have been looking for one for awhile. Please contact me at following phone number 1-888-769-9017 Roger Fairman Specialty Tires of America 1000 Don Mateer Drive Unicoi, TN. 37692

19 years, 10 months

Need NEC ProSpeed 386 and docking station ($$$)

by sellam＠vintagetech.com

I have a new bounty. A client is seeking an NEC ProSpeed 386 with docking station. If you've got one then it's definitely worth money. Contact me privately if you have one for more information. Thanks! -- 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 ]

19 years, 10 months

ASR-33

by THX1138＠dakotacom.net

Hi, I am desperately trying to make room here so my ASR-33 has got to go. I'll either eBay it or ship it off for "long term storage" ;-) In either case, I need to pack it so it will survive the UPS gorillas. I figured pull the mechanism off the base (is the base REALLY worth saving??) and put it in one box (the mechanism) and the "skin" in another. Wrap each in plastic. Shoot the *mechanism* box full of self-expanding foam -- so everything is encased in a conformal block of foam (the plastic wrap preventing the foam from migrating into the mechanism itself). And pack the skin in "cheetos" (peanuts)? Does this sound like a safe approach? It usually works for *monitors* but they aren't quite as irregularly shaped... Thanks! --don

19 years, 10 months

USR quad modems... (ontopic - really!)

by Billy.Pettit＠wdc.com

Don <THX1138 at dakotacom.net> wrote: TIP: An embroidery hook works wonders for fishing wirewrap wires out of a nest without too much damage! ;-) (but you have to find the right size hook to ensure a "good grab" on the wire) For those of us who go back to the dawn, there was the spring hook, a beautifully functional tool used on the relay machines. They worked great on the thick wire mats. I still have all of mine and even today find the spring hook to be one of the most useful tools around the shop. Another tool I found useful was a jewelers device to hold rings for soldering. It looks like a pair of tweezers with the ends bent out so they can't touch. You squeeze it, stick it in the wire mat, and release. The tension holds the wires apart. We made a bunch of copies using piano wire and put shrink tubing over the ends. If you get a chance, look at the 6600 or 7600 in the Museum. Seymour loved those dense wire mats - he used wire lengths to tune his systems. If you worked on one of his machines, you spent a significant part of your working hours buried in wire up to your forearms. The worst was the Cyber 170 machines. They were twisted pair 30 gauge wire mats. If you weren't careful, the pins bent and touched. And there was what we called "tingles". The broken piece off the end of a wire would disappear into the wire mat and eventually short two pins out. Even more fun, if you were tuning clocks, the power was on, so you could watch the path of the tingle by the little sparks. Always happened on a Friday night, of course. One of the worst nightmares I worked on was a machine that the engineers working on, had set their coffee cups on top of the cabinet and forgot about them. This was before the styrofoam cups, just waxed paper. It soaked through and dumped the coffee down into the wire mat. We tried for a few days to fix it but finally had to scrap the entire chassis. Per the Peter Principle, the chief suspect was later promoted to be my manager. Billy

19 years, 10 months

batteries Was: PDP-8 /e/f/m memory

by ajp166＠bellatlantic.net

> >Subject: Re: PDP-8 /e/f/m memory > From: Don <THX1138 at dakotacom.net> > Date: Wed, 16 Aug 2006 11:00:57 -0700 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >Allison wrote: >> >> What has this to to do with the topic at hand? > >If people are griping about the *possibility* of a battery >leaking inside their gear, I contend that if you're storing >that gear in conditions that would bring about this sort >of problem (e.g., excessive ambient temperatures, humidity) >then there are bound to be *other* things that are happening >to that gear besides the potential of a battery leak. Different topic and worth discussion. I attack it from a different view. I assume batteries will discharge when least desired in storage and will leak. All my PCs that have CMOS batteries accessable have a external (.6x2x1.5 inches) plastic box with a suitable battery placed in it and wires to the internal battery location. I had a bad experience early on with NiCd leakage on a board so off the board they go. External makes for accessability without opening the cases. It also allows me to use a battery that is larger or better that would not fit where the orginal was. I apply this to a my otehr systems as well, S100 toy clock battery, MicrovaxII TOY clock battery and similar. I agree heat and batteries generally do not get along well and storing equipment with batteries installed is also risky. Allison

19 years, 10 months

free stuff near Toledo

by paulrsm＠buckeye-express.com

The Toledo craigslist just posted the following for free: - An SGI Indy with its giant, heavy monitor. - An HP PA-RISC Pizza box machine with its heavier-than-the-Indy's monitor. I am not interested, but I could help someone else get them. -- Paul R. Santa-Maria Temperance, Michigan USA

19 years, 10 months

PDP-8 /e/f/m memory

by aek＠bitsavers.org

> Firstly, this is, as I am sure you agree, not a list to provide answers > to members questions. Thank you for the clarification. This will save me a great deal of time in the future not researching answers to questions. If this list is meant to be just another wank like alt.folklore.computers, enjoy the noise.

19 years, 10 months

Stuff for Sale

by marvin＠rain.org

I am in the process of doing a major downsize in the collection. Most of what I am getting rid of will be posted on the Vintage Computer Marketplace, probably at the rate of 5 - 10 items per day. The URL of the Vintage Computer Marketplace is: http://www.vintagecomputermarketplace.com/ My real interests are in the pre 1981 era although I will be keeping a few interesting later machines from the early 80's. What I intend to concentrate on are the Polymorphic and Lobo Drives computers since they were made here in Santa Barbara, and I still have enough contacts to find people who used to work there. And of course, I'll still be working with anything *I* find interesting :).

19 years, 10 months

The KS/NE Trip is Booked

by jrkeys＠concentric.net

Great News !!!! I have received enough in donations to pay for the KS/NE trip next month on Sept 8th. I now need just 135 more people to donate $10 or whatever amount they can from $1 to $$$ book the GA trip to rescue those items. Remember your donation is tax deducible and is for a great cause. Thanks to everyone that donated to make the KS/NE trip a go. I will get lots of pictures and hope the drive back will be smooth. Read more about the two trips at www.houstoncomputermuseum.org

19 years, 10 months

LSI 11/2 question

by compoobah＠valleyimplants.com

Got a few of my numbers backwards- the boards are in reality An PDP-11/03 processor, LSI-11 quad-height M7264EB (does anything go out over the C/D fingers, or are they just there for stability?) DHV11-A 8-line async serial RXV11 (forgot the V originally...) either MSV11-B 4k RAM or MSV11-PL 256K ram (18-bit, but will the LSI-11 just ignore the extra or will it futz up?) Am I getting in too deep for a first-go at a PDP-11? These were offered in trade for a scope, and I don't have any other PDP stuff (it would timeshare a VAX 4200 chassis with the VAX, with a very advanced "card-pull" scheduler to prevent conflicts). Scott

19 years, 10 months

Attention PDP-8 Fans

by madcrow.maxwell＠gmail.com

I've started a new wiki on the Wikia Scratchpad about the exploration of computer history through emulation and my first digital "victim" is the PDP-8. I have the outline of a basic PDP-8 (OS/8) in SIMH started, but I still need to flesh it out. I'll probably write my basic OS/8 tutorial tommorow, but input from more experienced fans would be welcome. Various articles (any red link) need to be written and while I plan on wrting most of them if need be, help from the community would be much appreciated. Just remember that your audience is presumably going to be curious newbies, not "old hands" who just need a little reminder. That said I look forward to your comments and contributions. Main Wiki Page: http://scratchpad.wikia.com/wiki/Computer_History_Exploration PDP-8 Article: http://scratchpad.wikia.com/wiki/PDP-8 Michael "Madcrow" K.

19 years, 10 months

ISIS-II

by walter＠kaiserseder.de

Hi Steve, i'm located in Germany, an i was responsible for INTEL from 1980 to 1986 at an Distributor. I found your ISIS-II stuff, when i'm looking for an CrossAsm for Mostek MK3870. If you need something i've a lot of original INTEL Software for ISIS-II and ISIS-III, and also Literature - feel free to ask me I read you have disassembled ISIS-II, - i'm interested in the source code. Also i'm looking for an XASM running on ISIS-II for MOSTEK MK3870 an Single Chip Controller based on the FAIRCHILD F8. Greetings from Germany Walter

19 years, 10 months

LSI 11/2 question

by compoobah＠valleyimplants.com

I have the opporitunity of getting some LSI 11/2 boards (LSI 11/2 processor, some memory, serial MUX, RK floppy driver) (I think) Couple questions: will the multiport serial work for a console or do I need a specific "console" card? Will these boards work in a VAX 4k BA430 chassis/backplane, or will the C/D wiring and DSSI over C/D throw them off?

19 years, 10 months

Apollo DN systems

by CaptnZilog＠aol.com

Just figured I'd post this out here... I have a collection of old Apollo DN systems (3000,3010,3500,4000,4500,5500 I think sums it up) I did a little work on porting NetBSD to and then have just never had the time to pursue. Might be willing to part with them to someone in the New England area, since I have monitors with some of them, and OS tapes, spare hard drives, etc. Anyone interested, feel free to contact me... really not up for shipping monitors around, but for someone fairly local with interest I might be willing to do a road trip. email reply, or to: phufnagel at snet.net -- Pete

19 years, 10 months

Apollo DN systems

by aek＠bitsavers.org

> Dude, I'm very interested in that stuph Anyone who uses "dude" and "stuph" in a sentence doesn't need to have anything other than a Linux box, preferably "modded".

19 years, 10 months

summagraphics MM1103 tablet

by hardware＠ees1s0.engr.ccny.cuny.edu

Hello Everyone, I ran across a Summagraphics MM1103 tablet. I see that there was a thread on this list in 2004 regarding this device. Do we know the communication protocol/format? Do we know what the 3 8-bit DIP switches inside do? Any documentation or pointers to documentation would be appreciated. thanks, -kurt

19 years, 10 months

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