- test-drb@ccmp.vtda.org - classiccmp.org

R: Re: Mac "Workgroup Server" (or "network server") hardware & AIX

by supervinx＠libero.it

http://www.supervinx.com/OnlineMuseum/Apple/Quadra/950/ Scroll down and you'll find many A/UX pictures

10 years, 2 months

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Fast Unibus Sync Serial?

by seefriek＠gmail.com

From: Ethan Dicks <ethan.dicks at gmail.com> > > DUP-11? Will that do what you need? > Not sure, Ethan. I'm been looking at the doco and it's not clear yet if it's suitable for what I'm trying to do. Thanks for the pointer. KJ

10 years, 2 months

1
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Mini Map Array Processor - What in tarnation?

by wdonzelli＠gmail.com

Yes, the CSPI box is mounted inside a standard DEC cabinet. I have one of these things in a VAX, originally part of some sort of chemical analysis tool. -- Will On Apr 26, 2016 9:44 PM, "Jon Elson" <elson at pico-systems.com> wrote: On 04/26/2016 07:59 PM, Swift Griggs wrote: > Seriously, > > http://tinyurl.com/j46jg4p > > http://www.computerhistory.org/collections/catalog/102743645 > > What in the world is this thing? Some kind of early parallel or vector > processor? > We got a CSPI 6410 and had it hooked to a VAX 11/780. It was probably a bigger brother to the machine you link to. There was a big math library that came with it. If you had really regular matrix operations, such as FFTs, matrix multiplies and similar classic operations, it could do them quite fast, in the several MFLOP range. The bigger the matrix (as long as it fit in the memory of the unit) the better, as the library just set up all the registers, loaded the data and turned it loose. If you had a bunch of small matrices, it was a lot less efficient, as it had the same setup overhead for every task. Yes, it is a vector processor, with a floating-point multiplier and adder, some address arithmetic logic and a sequencer. Jon

10 years, 2 months

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Mini Map Array Processor - What in tarnation?

by swiftgriggs＠gmail.com

Seriously, http://tinyurl.com/j46jg4p http://www.computerhistory.org/collections/catalog/102743645 What in the world is this thing? Some kind of early parallel or vector processor? External? How delightfully weird, except there is very little online about it. Did any of you work with one of these? What kind of instructions do they use? What is their bus width on the ...uh what? CPUs? What kind of addressing modes & size(s) do these use? Why does the one reference talk about the 64k RAM they had? Were these standalone machines ('cause it looks like it goes to a VAX-11 and "LSI-11") ? This was before my time but fascinating, nonetheless. -Swift

10 years, 2 months

3
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Using flashable Macintosh ROM SIMM

by dave＠661.org

I have a "MACSIMM" from GGLabs (http://gglabs.us) which I bought from their Ebay store. Unfortunately they haven't followed up on my request for information on how to prepare a ROM image for use with the thing. Has anyone else here used this or a similar device to hack the ROMs of the Mac SE/30, IIsi, IIci, or IIfx? It's composed of four 39SF010A 32-pin PLCC chips the special 64-pin SIMM. -- David Griffith dave at 661.org A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

10 years, 2 months

2
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Avionics and amazing gear made by Tatjana (was Re: Data General Nova Star Trek Rockwell Collins vs. Vaisala SPT11A)

by wdonzelli＠gmail.com

There were a few others, as well as some RF devices with the tuned parts inside the bulb. There were also some oddball types made for weather balloon use that had the whole transmitter circuit as one unit. -- Will On Apr 26, 2016 6:30 PM, "Chuck Guzis" <cclist at sydex.com> wrote: On 04/26/2016 12:40 PM, Paul Koning wrote: > This sort of stuff doesn't seem to be all that common; I haven't seen > it elsewhere. Multiple tubes, like dual triodes or triode/heptodes > are pretty common, but those are just the active part. The only "passive in the tube" examples I can think of in US manufacture are simple between-unit resistors, such as the 6N6. --Chuck

10 years, 2 months

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PAL on CDU-700 / 710 Unibus disk controllers

by ian.finder＠gmail.com

Does anyone out there have one of these controllers? There is an unprotected PAL- the address decoder- and I really need a dump of it. Many programmers, particularly the BP technologies ones, can read it

10 years, 2 months

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PAL on CDU-700 / 710 Unibus disk controllers

by glen.slick＠gmail.com

On Apr 26, 2016 3:04 PM, "Ian Finder" <ian.finder at gmail.com> wrote: > > The spec sheet from the PAL mfg. (signetics PLS173) seems to indicate > security fuses aren't an option on the model on my board. I have not > actually tried yet. > Regardless of what the spec sheet does or does not explicitly say, I think when I selected that device in the BPWin device programmer software there was an option to protect the device after programming. I'm mobile now, I can check that later.

10 years, 2 months

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strangest systems I've sent email from

by blstuart＠bellsouth.net

On Mon, 4/25/16, Swift Griggs <swiftgriggs at gmail.com> wrote: >The idea is somewhat that if students learn a > "good" language that'll teach them some meta-structure that will help them > later. Certainly a lot of people do view it that way, but it's not what I was getting at or how I see it.? Based on my experience, the virtues of any single language are pretty much irrelevant.? What's vitally important is that the student emerge with a deep understanding of how a variety of languages actually work, how they're processed and how the computer executes code written in them.? If you have that deep understanding with a sampling of languages that represent some of the variety of techniques and paradigms (for lack of a better term), then you'll be able to pick up and adapt to most any language that comes along.? To tell you the truth, I'm not very likely to hire anyone who isn't conversant with at least half a dozen different languages.? To summarize, my focus isn't on the skills of any particular lanugage; it's on the understanding of the fundamental concepts, principles, techniques, and mechanisms that make up the world of computing. >Then, let me say that the *idea* that I was attacking Pascal via > Oberon rather than the Ivory Tower Academics is ridiculous. I did understand the point in your first message to be anit-"Ivory Tower Academics."? However, my point it is that viewing the people you have identified as such and dismissing their experience and expertise is a narrow-minded and short-sighted perspective. > Your point might be > logically valid, but ask a 23 year old if they care when they can't get a > job after giving the uni a quarter million bucks and 4-5 years of time > they spent being "educated" rather than "trained". It's interesting that you pick that age as the example.? My daughter is 23.? For her, the undergraduate experience wasn't about a job at all.? It was about exploring the intellectual world and (to borrow >from Thoreau) sucking the marrow out of that life.? In the interest of full disclosure, however, I should point out that she's not typical of most college students (although I wish more were like her). She did grow up in a household that averages more than two degrees per person and she did triple major in her four undergrad years. (A proud daddy can't help but brag a little. :) ) > The underlying point I? was making is that schools don't always > "train" a person ... I apologize if I misinterpret, but I also detect the suggestion that they are supposed to.? I don't disagree that they don't train, but I do disagree that's what their purpose is. I'm not suggesting that some degree of training coming along with the education is a bad thing. However, I'm saying that's not the primary purpose of the university. >? and that's what I wanted and actually needed. There seems to be an implication here of an XOR when I look for an AND. In particular, if I have a candidate sitting across the interview desk from me, I'm not interested unless they have both education and training. I expect the education to come >from a formal environment where people of long experience can help the student understand many perspectives. I expect the training to come from self-directed experience. Unless a candidate shows both the ability to work in a rigorous intellectual manner and the self motivation to go beyond what they've been given, I'm not interested. > all but one of the profs had > turned off their brains in 1986 and it was the 90's. It's certainly true that does happen both in academics and in industry. However, more often than not, the ideas that were seen as "new" in the '80s, '90s, '00s, and '10s, are really ideas that the Computer Science community saw, studied, understood, etc in the '50s, '60s, and '70s. So what appears to be out of touch is often really a broader perspective and one worth understanding and learning from. > True. I wonder though, do you believe that teaching a > language with almost zero commercial value is justified > in the name of education because of it's superior "meta" > qualities ? I'm not sure I can answer the question as you've posed it. As I said, I tend to consider the choice of any single language to be mostly irrelevant. I'm much more interested in the neural pathways that the student builds as a result of the experience of coming to understand a large set of languages. As it turns out, I am currently involved with a restructuring of the introductory programming sequence at one university. Our choice of languages was driven by both pedagogical and vocational considerations. Were our environment different such that we should have looked at only one or the other, then we would have chosen differently. Regardless of what we did pick, we never intended for the freshman languages to be the only languages our students knew before graduation. No one or two languages will give the breadth and depth needed pedagogically. Neither will any one or two languages suffice for building a career as a computer scientist. > Grades aren't meaningless if you have a grant/scholarship > to maintain or need to get into graduate school. There are expected minimums, certainly. Based on my experiences in both academics and industry, I would have my doubts about whether someone is really cut out for a CS major if they can't average Bs in their major classes. On the other hand, I have yet to be in a hiring meeting where one candidate was chosen over another because they had a 3.5 vs the 3.3 the other candidate had. For that matter, I always question candidates that come in front of me who have 4.0 averages. Before I can take them seriously, I need to see some evidence that learning new things is a higher priority to them than the grade. It goes back to the expectation that the candidate show evidence that they can pick things up on their own as well as in the classroom. > They have plenty > of meaning to employers like IBM who might not hire you for > that entry-level position with a low GPA. Actually, it's better to consider companies with unenlightened cutoffs to be simply advertising that they are not where you want to be. > They might not reflect some aspect of education or learning > you think is important, but there is more to going to uni than just > to get a mind expanding education. The purpose of the university is the discovery, dissemination, preservation, and interpretation of knowledge. A necessary, but not sufficient, part of being well-prepared for a professional career is the exposure to that breadth and depth of knowledge. I would rephrase your statement to say that there's more to preparing for a career than just getting a university degree. > I think folks who haven't been to school in 20+ years have a totally > warped view of what is happening nowadays. I might point out that on this mailing list, you will find people who are all across the spectrum with exposure to education. Some of us were students many years ago and haven't had much contact since. Some of us have been students recently. Some of us have siginificant faculty experience. As with the experience of changes in the CS field, I'd suggest that the longer the period of time over which one has experience with education the less warped the view of what's happening. However, each individual must decide for themselves whose opinions and experiences earn their respect. > All our code was in C or C++ and we found that none of the students > from the local universities had those skills. Although there are plenty who disagree with me, I argue that the purpose of the university experience isn't the skills; it's the understanding. I always say I want to hire the preson who I can tell on Friday that we'll be using Intercal for the project and they'll spend the weekend teaching themselves the language and come in Monday morning ready to code in Intercal. I (as well as entrepreneurs I know) have very little interest in how much experience and skill a candidate has in a particular language. The reality is no matter what their experience is coming in, I'm going to have to teach them how to do things the way I want them done. > I could only attribute that to the memorize-and-regurgitate > culture of the schools, but maybe it was just bad luck.? It's a combination of bad luck and the ill effects of misplaced priorities filtering up from the primary and secondary school levels. As I tell my students, there is a continuum of understanding. At one end, there is the mere repeat back to me what I've said to you. If that's all a student can do, then there's not much value in it. I can simply put the same information into a computer and then not bother paying a person for it. At the other end of the continuum is the ability to ask the right next question, the understanding of how our current knowledge came about, and the understanding of how to advance that knowledge. My objective in every class I teach is to help each student move as far along that continuum as they are capable. The farther along that continuum you move, the more you will be able to discover what has never been known before and create what has never existed before. Many would classify that perspective as "Ivory Tower." They might say, I can't put food on the table with that attitude. I would differ with that. I have put food on the table for several decades, and in only a few of those years were the funds coming primarily >from the academy. Indeed I have realized that my level of understanding and my drive to explore, investigate, and create are of significant value to many. Those who recognize that are willing to exchange monatary renumeration for the contributions I can make. Those who don't recognize it self-select themselves out of the pool and I don't have to worry about them. Throughout this, it has not been my intention to in any way dismiss your perspective or to suggest that it is a "wrong" perspective. Indeed, it's a perspective I'm quite familiar with. Instead, my objective has been to suggest there's another perspective whose consideration might lead to deeper understanding. It is a perspective which attempts to temper the immediacy of the question of tomorrow's employment with the longer-term view of how that employment fits into the thousands of years of human civilization. BLS

10 years, 2 months

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SATA SSDs for SGIs using ACARD adapters

by swiftgriggs＠gmail.com

I use Samsung 850 Pro disks exclusively. The main one I tested with was 128GB. 80-pin SCA hot swap Ultra160 SCSI to SATA: This one I've tested in my O2 and Tezro: http://www.acard.com/english/fb01-product.jsp?idno_no=240&prod_no=ARS-2160H… 50-pin ultra-scsi to SATA: This one I've tested in two Indys (R4600 200Mhz and R5k 180Mhz) also a Challenge S with an R4600 200Mhz CPU): http://www.acard.com/english/fb01-product.jsp?idno_no=249&prod_no=ARS-2000S… There is also a 68-pin variant. I've yet to try one because I will probably get rid of most of my Sun gear at some point in the future. However, I'd be interested to know if they work well or not. I still play with older SPARC boxes from time to time. I've upgraded many of my SGI's to use SSD disks. You don't see tremendous improvements in throughput (though it does help some). My results testing with 'fio' showed about 10% throughput increase on most operations overall. However, the latency becomes much lower. This gives the machine a much more snappy feel if you use them as desktops. Web browsing is especially ameliorated (as in, you can almost do it, har har). On my Tezro the results were pretty dramatic. The quad R16k CPUs still keep up pretty well with my "modern" PCs for most operations (including browsing). Using internal SSDs makes the anecdotal experience tangibly improved. I'm curious if anyone has used one of the 50-pin units to upgrade an Amiga 3000 or older mac. I'm thinking of other machines like one of the slimmer and more interesting AlphaStations might also be fun to try (or a newer Multia with the SCSI adapter). Did Atari ST's have SCSI? Without looking it up, I'm guessing so. That'd be another fun one to test. Also before someone pipes up saying "The older SCSI interface is going to limit you too much to feel the difference" let me just say that's NOT been my experience. As I mentioned, you might not get much throughput increase (though it will usually improve some), but the numbers don't lie on the latency which drops outta sight into the sub-1ms range most of the time. You feel that on desktops, bigtime. Also, if you say "that's not stock! It's not original anymore!" Please let me just respond now and also say "Yes, I know that, thank you." Thanks, Swift

10 years, 2 months

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Fast Unibus Sync Serial?

by seefriek＠gmail.com

Is there an equivalent to the DSV11 for Unibus? Or other quick Unibus sync serial that my Google-fu isn't good enough to find? The DMC11 looks like it can do 56Kbps over V.35, which is better than the 19.2kbps on the DMF32, but it would be useful to be able to push to 256Kbps (or faster). I'm particularly interested in doing HDLC. KJ

10 years, 2 months

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Data General Nova Star Trek

by shermanfoy＠att.net

have discussed w/ Jim: I have a 240 Euro connector bench transformer meant for this.

10 years, 2 months

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Vintage computer ads...

by COURYHOUSE＠aol.com

very bogus with the hp 150 business system and they guy claims the 9121 dual floppies was a hard drive.... Ed# _www.smecc.org_ (http://www.smecc.org) In a message dated 4/20/2016 7:47:24 A.M. US Mountain Standard Time, oltmansg at gmail.com writes: On Wed, Apr 20, 2016 at 9:37 AM, geneb <geneb at deltasoft.com> wrote: > https://www.youtube.com/watch?v=7T1IYdjOpYE > > The video is an hour long, but you can skip around. It includes ads for > machines like the ITT Xtra, IBM PC Jr, etc. The Hayes Smartmodem ad is > just atrocious. :) There's even ads for IOMega drives and the Promethus > Pro Modem... > > Is that Bryan Cranston a la Breaking Bad in that video??? Sure looks like him.

10 years, 2 months

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Accelerator boards - no future? Bad business?

by swiftgriggs＠gmail.com

Remember all the accelerator boards for the Mac, Amiga, and even PCs in the 90's ? I've often wished that I could get something similar on my older SGI systems. For example, fitting an R16k into an O2 or doing dynamic translation on a 4.0Ghz i7. I'm most familiar with the Amiga accelerators. I suspect those who produced them were helped out greatly by a couple of factors. One is that the hardware specs were very well known and full schematics were available for most (all?) Amigas. I doubt the same is true of SGI machines. The other is that many Amigas had processor "slots" (with edge connectors) rather than some tiny fiddly ball-grid array etc... but I'm not a EE; so maybe that's bunk. When I look at these boards they seem like they'd be a LOT of work to develop and produce. I wonder how they were even economical to make back in the day. Plus, now the user base will probably only shrink. It's not a great business model for a hard-to-produce item. It doesn't keep my techno-lust from wanting it, though. So, here's the question. Is my dream likely to ever be possible enough that a boutique shop could pull it off and not lose their shirt on the production costs and R&D to do it ? I'm encouraged by things floppy emulators that are produced for these old machines. However, that's probably significantly easier to make than a CPU accel board. What do you guys think? -Swift

10 years, 2 months

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Keys - Non-Ace was RE: ACE Key codes (xx2247 etc.)

by mhs.stein＠gmail.com

I finally found my micrometer; is there a cross-reference of pin # vs. depth or just a list of standard depths for ACE keys somewhere? m

10 years, 2 months

11
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High resolution screens are great for typography - Re: Accelerator boards - no future? Bad business?

by jnc＠mercury.lcs.mit.edu

> From: Swift Griggs > it's (currently) a big hassle in Windows to get absolutely every font > to get bigger at once. Have you tried right-click on a blank spot on the desktop, 'Properties', 'Setting', 'Advanced'? The window that pops up allows you to change i) on older Windows, _all_ font sizes (options are 100%, 125%, and custom) at once; ii) on newer Windows, the size of _everything_ (which includes images, I think). Noel

10 years, 2 months

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bit slice chips (was Re: Harris H800 Computer)

by jnc＠mercury.lcs.mit.edu

> From: Brent Hilpert > I'd say the 74181 (1970) deserves a mention here. Simpler (no register > component, ALU only) but it pretty much kicked off the start of > IC-level bit slicing. Yes, it was used in quite a few machines. Among the PDP-11's alone, it is found in the -11/45, /05, /40, /04 and /34, to name a few that I checked quickly, and almost certainly others too (e.g. /70). Noel

10 years, 2 months

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Accelerator boards - no future? Bad business?

by jnc＠mercury.lcs.mit.edu

> From: Jules Richardson > I think my personal view is that I'll consider modern replacements to > things when it's impossible to use the originals - but not simply for > reasons of speed, cost, convenience. This sounds like it's not _that_ far from my position, which is that I am against building modern equivalents for "stuff that is still available and perfectly functional". >> running the disks ... risks damaging what are effectively museum >> pieces. > There I'd just say run them until they break and can't be fixed, and > then they can become static museum exhibits. The problem with that is that I feel that it conflicts with what I feel one of our main goals ought to be, which is to preserve these machines in running form, for history and the education of future generations. Yes, even powering them on risks a failure, but most failures are repairable. A crashed head, if you don't have spares, is pretty much un-fixable (there's a whole manufacturing complex needed to create them, which is now gone, and one can't substitute an alternative part). So I'd run them as little as possible - and a modern solid-state alternative really helps with that. (BTW, there's a big debate in the museum world over this sort of topic: some places won't do any cleaning and fixing of antique objects, retaining them exactly as they were, and living with the degradation of plastics, etc; others do restoration, but mark what was done, and make it reversible if possible; others go all out and restore things to 'like new'. I'm kind of in camp II, myself.) There's also a practical down-side to the 'run it as a matter of course till it fails forever' approach; if one has packs for that drive which one wishes to read or write, that's no longer possible once the drive is roached (although someone else could do it for you, but that's not necessarily a desirable option). And of course, with the drive dead, the machine may not be runnable unless one adds a modern alternative - and if one's willing to do that _after_ the drive is fried, why not before? > From: Swift Griggs > I might be laughed at for wanting a Fiero-Ferrari For a good time, Google 'Jerrari'! :-) Noel

10 years, 2 months

2
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pdp8/e problems

by Mark＠Misty.com

Hi, Is there anyone with a good set of 8/e prints who could help me narrow down some troubles? My 8/e was working a few years ago, but now it's developed some problems. It seemed to work fine for about the first 2 minutes that I tried it, but then it developed these two symptoms: - Most of the time, upon power up, LOAD-ADDR clears all the random address lamps, but will not take an address, just all 0s. Occasionally when I power it up, LOAD-ADDR will permit me to load an address, and see it's contents as it should. I can then enter other addresses, hit LOAD-ADDR, and get consistent results looking around at random data in different memory addresses. - Regardless of whether it's in the broken load-addr state above or not, hitting DEP or EXAM just turns on the RUN lamp, and it's then stuck with RUN on, and non-responsive to any other front panel actions. This happens irrespective of the position of HALT. I then power-cycle it and it is back in either broken or working LOAD-ADDR mode as described above, usually broken. So far, the only M8330 prints I have found are extremely fuzzy, so I cannot make out the IC identifiers or match them up to the equally fuzzy schematic. By board-inspection I identified the 74S74 "run" flip-flop, and in fact I can un-stick the RUN state by briefly grounding CLR, but still cannot DEP or EXAM from the front panel -- it gets stuck back with RUN on if I hit either DEP or EXAM again. The power supply voltages are right-on. I've reseated and repositioned the boards. The connectors are very clean. Wiggling boards doesn't change any of the symptoms. Wiggling switches doesn't affect anything. This is a very clean 8/e. Mark -- Mark G. Thomas (Mark at Misty.com), KC3DRE

10 years, 2 months

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bought in error - 1W Resistors

by binarydinosaurs＠gmail.com

Folks, Thanks to an ordering SNAFU by me I have some 1W resistors spare at 1K, 10K, 220R and 330R. 20 of each. They only cost ukp1 per bag so it's not worth me trying to send them back. Anyone? Or do I just bung them in my spares box and use them ad-hoc... -- adrian/witchy Owner of Binary Dinosaurs, the UK's biggest home computer collection? www.binarydinosaurs.co.uk

10 years, 2 months

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Keys - Non-Ace was RE: ACE Key codes (xx2247 etc.)

by jnc＠mercury.lcs.mit.edu

> From: Dennis Boone >> it says "Chicago Lock Co" and "GRB 2" > Aha. > Cut 215 on Ilco S1041T. You were able to deduce that from the "GRB 2"? Is that authoritative? If so, I'd like to add it to the 11/05-10 page on the Computer History Wiki. Also, I have an original XX2065 (Data General) which I have no use for; if anyone has an XX2247 they'd like to trade for it (new is fine too), please let me know. Noel

10 years, 2 months

2
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Data General Nova Star Trek

by erik＠baigar.de

Hi Jim, regarding reading the StarTrek paper tapes I spent some time on the weekend to rework my SPT11A manual reader - I got this from an eBay auction and it was an accessory for some military receiver (probalby to read in some codes). It had a fimrwaere which refused to communicate with a simple terminal program, so I reverse en- gineered the hardware and replaced the original ROM it by an own firmware which simply sends the contents read from PPT to the PC via its RS232C... http://www.baigar.de/vintage/SPT11A-mod-Internal.jpg So I'd offer sending this to you as an item on loan to read in your tapes and you return it afterwards? I tested it with some data and it works well (just slowly pull the paper tape through the reader and use e.g. putty to log the binary serial output). After turning on the reader there is a short welcome message to verify the serial connection (9600,8N1). The only question is, whether you can handle the EU style power supply shown in the picture... http://www.baigar.de/vintage/SPT11A-mod.jpg I ordered USB->RS232C converters and if you have some more time, I'd attach one of them to the reader not only doing conversion but also supplying the converter with power from the PC. Addidionally you should send me your physical address via PM so I can prepare for shipping... Best regards from Germany, Erik. On Mon, 18 Apr 2016, jim s wrote: > > > On 4/18/2016 12:19 AM, Erik Baigar wrote: >> >> >> Hi Jim, Dear Sherman, >> >> thanks for the update. I wish you the very best for digitizing the >> tape. I can offer reading it using a Facit N4000 (speed can be configured >> down to 50cps, i.e. around 10cm/s). I also have got a manual reader >> which unfortunately is broken: I would have to generate a new 80C51 >> chip with the right firmware (not a big issue, but not possible over >> night). I can offer fixing this and lending it out to you in >> two or three weeks... >> > I'd be glad to help with shipping on that and would use it. I don't have any > fanfold samples to send to you for testing, but would be glad to have a hand > version to feed this thru. >> I'd be really interested in getting hands on a copy to run on my >> Rolm computers. Are you sure, that there is only a singel tape? > There are 47 individual tapes in the set. All from 1/4" of fan fold width to > about 1 1/2" of fanfold width. > > I will put up my photographs and videos later today and reply again with that > information on my blog. >> As mentioned I have got one tape of a two-tape binary distribution >> of the StarTrek. >> >> Best Regards from Germany, >> >> Erik. >> >> >> >> On Sun, 17 Apr 2016, jim s wrote: >> >>> Here is an update on the tape. It is a box of 47 tapes. We got a >>> volunteer from Charles Anthony to do a video reader for it. >>> >>> I have a video I can share of that tape if that is of interest. I was >>> hoping that it was going to be a basic source tape distribution, but on >>> looking at it, that doesn't fit with what I can read by eye on the tape I >>> read, so I bet it is a bunch of binaries. >>> >>> The tape is fanfold and will need a very careful handling to read it so we >>> will proceed carefully. It is pristine now, doesn't look like it was ever >>> read. >>> >>> I will let you know if we need help, but am going to look for a hand >>> optical reader somewhere for loan or build and attack it that way. >>> >>> It has writing on the box that leads me to think it is from a user group >>> for DG of some sort if that helps you identify the source of it. >>> >>> thanks >>> Jim >>> >>> >>> On 4/16/2016 3:04 AM, Erik Baigar wrote: >>>> >>>> Hi Jim, >>>> >>>> just out of curiosity: Did you have got a look at the DG Star >>>> Trek? Is there a chance to get a copy of the tape? >>>> >>>> If you need assistance in reading the tape, just drop me >>>> a note... >>>> >>>> Best regards from Germany, >>>> >>>> Erik. >>>> >>>> >>>> On Fri, 8 Apr 2016, Erik Baigar wrote: >>>> >>>>> >>>>> Hi Jim, >>>>> >>>>> short version: Yes, I can confirm existence of such a software and >>>>> I'd be highly interested in a copy. Of course I can >>>>> offer digitizing it ;-) >>>>> >>>>> longer version: I am preserving various Rolm (later Loral) 16 bit >>>>> machines which are hardened, military machines widely comaptible >>>>> to the DG hardware (1602 compatible to Nova and MSE14/Micro is the >>>>> hardened Eclipse). If interested, have a look at my logbook... >>>>> >>>>> http://www.baigar.de/TornadoComputerUnit/TimeLine.html#HDDsim >>>>> >>>>> ...datecodes 10/20/2014 to 12/15/2014 and 2/3/2015 to 2/28/2015. >>>>> Together with two friends (both maintaining a 1602B and native >>>>> DG hardware) we built a harddisc simulator to run advanced >>>>> software (e.g. RDOS). During my efforts I rescued some paper tapes >>>>> from Rolm (diagnostics)... >>>>> >>>>> http://www.baigar.de/TornadoComputerUnit/EB-RolmTapes.jpg >>>>> >>>>> ...and among these serious, mighty tapes was one labeled >>>>> "Star Trek 1/2". I digitized it, but without the second part >>>>> it is of nut much use, so I am sure that such a game existed >>>>> for DG hardware. From the first tape I can tell, that it is >>>>> not just the BASIC listing, but native machine code and there >>>>> is a copyright message dating 1969-1973 ;-) >>>>> >>>>>> The tape pile is fanfold about 10" across in a DG box specially made >>>>>> for such use. >>>>> >>>>> On some occasions I had trouble reading the 30+ years old >>>>> oiled black tapes due to some holes on the folds being >>>>> obscured at the from debris of the ageing paper... >>>>> >>>>> The very best from Germany, >>>>> >>>>> Erik. >>>>> >>>>> >>>> >>>> >>> >> >> >

10 years, 2 months

1
0
0 0

Keys - Non-Ace was RE: ACE Key codes (xx2247 etc.)

by jnc＠mercury.lcs.mit.edu

> From: Dennis Boone > Haven't managed to id the 11/05 key yet. I have an original (which was used to make a ton of replicas for people a while back); it says "Chicago Lock Co" and "GRB 2". No idea what the latter means. The copies were made with Hillman Y11 and FR4 blanks (both work, but one has to be trimmed a bit, length-wise). Noel

10 years, 2 months

2
1
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Finding classic computers in the UK

by aaron＠aaronsplace.co.uk

Hi all, Can anyone offer any advice on where to find classic computing equipment in the UK? I've been keeping an looking for a terminal such as vt220 for quite a while now on eBay without much luck. Maybe I just don't know the right people? Thanks, Aaron

10 years, 2 months

7
10
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Have VAX 82x0/83x0 console floppies been archived?

by derschjo＠gmail.com

I also picked up a VAX 8350 today (it was a productive afternoon). It came with a box of maybe 40 RX50 floppies for console and various diagnostics. A cursory Internet search didn't reveal whether these have been archived already. If they haven't already been archived somewhere, I'll take care of archiving them later this week... Thanks, Josh

10 years, 2 months

2
3
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4.2BSD TU58 distribution tape for VAX-11/750?

by derschjo＠gmail.com

Hey all -- I'm researching what I need to have on hand to get 4.2BSD installed running on my 11/750. I'm pretty close to having mass storage working, I have a SCSI TMSCP tape controller that should do the job in conjunction with a SCSI 9-track drive, and the VAX itself seems to be happy. What I don't have is a copy of the TU58 cassette that would have been provided with the 4.2BSD distribution (at least, according to the installation documents). This contains utilities for formatting the disk and copying the root filesystem (from a *real* tape drive) to the root partition, so they're pretty essential for bringing a machine up >from scratch. If I had a SCSI *disk* controller, I could cheat and do the installation on SIMH (which avoids using the TU58 by cheating in a different way) and DD the whole thing over, but I'm not so blessed. I can't seem to track down a copy of this TU58 on the 'net -- anyone have one squirreled away somewhere, or know where I should be looking? Thanks, Josh

10 years, 2 months

3
3
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Vt 103 / lsi 11/23 marketed as a desktop late 1980

by billdegnan＠gmail.com

Prior to the DEC Rainbow, Chrislin Industries was marketing the 11/23 with vt103 as a desktop computer. This is a 3rd party vendor. Maybe they were on to something... Bill Degnan twitter: billdeg vintagecomputer.net

10 years, 2 months

3
3
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COSMAC Elf switch panel using PCBs

by spacewar＠gmail.com

I built a new Elf switch panel, but this time I used two printed circuit boards for the switches and the bezel. The bezel PCB has white soldermask with black silkscreen. The next revision will have black soldermask with white silkscreen, and the legend font, weight, and positioning changed to more closely match the original Elf photo in Popular Electronics. https://www.flickr.com/photos/22368471 at N04/sets/72157667455777465 The 20-pin header has the same pinout as Bob Armstrong used for the Spare Time Gizmos Elf 2000, but I don't presently have an Elf 2000 to test it with. For now the main intent is to use the panel for a new version of my FPGA Elf. I'm not sure whether I got the wiring of the LOAD switch correct; the Elf 2000 documentation refers to normally closed and normally open contacts of that switch, but for a toggle switch that doesn't make any sense to me. If anyone can tell me which pins of the Elf 2000 connector are grounded when the load switch is active vs inactive, that would be appreciated. The 20-pin header should have been right angle; since I only had a vertical header on-hand, the ribbon cable had to be plugged in before the switches were soldered in place, and the switches are not flush with the switch PCB. The toggle switches and push-button switch are C&K 7101SDV3BE and 8125SDV3BE, respectively, which have 0.42 inch actuator, 0.28 inch threaded bushing with keyway, vertical PCB mount with V-bracket, gold contacts, chrome actuator finish, and nickel bushing finish. These particular C&K switch variants are not very common, so I'll probably use different ones in the future, without the V-bracket. I don't yet have enough of the red and white toggle caps, which are C&K 896803000 and 896801000, respectively. The red button for the push-button switch is C&K 801803000.

10 years, 2 months

4
9
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Tadpole Sparcbook Hard Drive

by ben＠bensinclair.com

This is a long shot, but does anyone have a Tadpole Sparcbook 3TX hard drive? Their existence may be just a myth. -- Ben Sinclair ben at bensinclair.com

10 years, 2 months

2
2
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FA: 5.25" floppy mailers

by cclist＠sydex.com

I just came across two unopened boxes (500 each) of 6"x0" 5.25" floppy disk mailers. Anyone want them? You can have them for shipping, FOB 97405. --Chuck

10 years, 2 months

1
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First Retail version of MS-DOS was Re: Ibm s-100 system?

by cctalk＠ibm51xx.net

I am not sure if 5.00 was the first Retail version. I know that for fact there is a 3.2 version released in the blue plexiglass Microsoft retail packaging. The 4.x versions are usually gray boxed with some having OEM/new computer stickers. -Ali

10 years, 2 months

1
0
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Ibm s-100 system?

by billdegnan＠gmail.com

Byte Jan 1981 page 204 refers to an IBM S-100 microcomputer system IBM demoed in Europe. Anyone here seen this machine or heard about it? Bill Degnan twitter: billdeg vintagecomputer.net

10 years, 2 months

6
8
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WTB: Sun Voyager Bag, Oberheim Synthesizer

by ethan＠757.org

Two things on the hunt list: 1. Sun Sparcstation Voyager bag (the bag to put it in) 2. Oberheim Matrix 6, 6R or 1000 synthesizers.

10 years, 2 months

1
0
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bit slice chips (was Re: Harris H800 Computer)

by spacewar＠gmail.com

On Thu, Apr 21, 2016 at 12:07 AM, Raymond Wiker <rwiker at gmail.com> wrote: > I was a bit surprised to see that it used 2901 with a date code of 1985 - > the 2901 was introduced 10 years before. The 2901 was the workhorse bit-slice data path chip for many years. The A, B, and C suffix parts were progressively faster variants introduced later. Eventually there were CMOS versions, and 16-bit-wide versions. While AMD introduced the 2903 and 29203 as functionally improved (but not directly compatible) 4-bit parts, they weren't nearly as widely used as the 2901. Most other bit-slice parts can be considered "also-ran" at best, with the Intel 3001 and 3002 probably being the next most successful. MMI tried to beat AMD to market with the 5701/6701, which was very similar to (but not compatible with) the 2901, but they were late to market and AMD won. Motorola offered the MC10800 ECL bit slice series, which were significantly faster at introduction than the contemporary Am2900 parts, but AMD kept introducing faster 2901s. Some later 2901 variants from AMD and National Semiconductor actually used ECL internally, but had normal TTL I/O, but the CMOS that followed were even faster than those.

10 years, 2 months

9
17
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bit slice chips (was Re: Harris H800 Computer)

by jnc＠mercury.lcs.mit.edu

> From: Jon Elson > The 11/45 and 11/70 are mostly the same processor. ... > the data paths boards and FPU are the same part numbers 'Yes' to the FPP (well, there are two versions, the FP11-B and FP11-C, but they are both identical in the two machines). 'No' to the data paths, though: e.g. the M8100 in the /45 (the board with the 74S181's on it) is replaced by the M8130 in the /70. The two are _very_ similar, but I suspect not interchangeable (examing the prints shows minor differences). AFAIK, the only non-FPP board in the CPU which is interchangeable between the two machines is the M8132 (instruction register decode & condition codes) - and only to the KB11-D /45 variant, not the -A. {As always, just want to be accurate! :-} Noel

10 years, 2 months

2
1
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bit slice chips (was Re: Harris H800 Computer)

by jnc＠mercury.lcs.mit.edu

> AFAIK, the only non-FPP board in the CPU which is interchangeable > between the two machines is the M8132 (instruction register decode & > condition codes) So it seems like there's an(other) error in the DEC documentation. If one looks at 11/70 Maintenance Manual (EK-11070-MM-002), it says (pg. 1-3) that the KB11-C (11/70 later CPU) contains an M8133 ROM and ROM Control board, the same as the KB11-B (earlier CPU, pg. 1-4), _but_ ... The KB11-C prints include the drawings for the M8123 (also used by the KB11-D, the later /45 CPU). Other manuals confirm that the KB11-C uses the M8123 (see, e.g., the KB11-A,D Maintainence Manual, EK-KB11A-MM-004, pg 1-1). I _thought_ the KB11-D used two of the same boards as the KB11-C, but then, when I went to check, to be sure I had the correct info (before sending out my email intended to "just want to be accurate", sigh), I relied on the DEC manual... :-( Oh well, that's what I get for relying on DEC manuals! :-) Noel

10 years, 2 months

1
0
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Accelerator boards - no future? Bad business?

by jnc＠mercury.lcs.mit.edu

> From: Jules Richardson > I can't see the point in modern upgrades .. At the point where people > start adding emulated storage, USB interfaces, VGA display hardware > etc. it stops being a vintage system and starts being a modern version > which just happens to still have a few vintage parts. I agree with you to some degree, but... Some components are just hard/impossible to find now - like old original disk drives (seen any RP0x's for sale recently?), or Able ENABLE's - and in any case running the disks is both non-trivial (power/heat) and risks damaging what are effectively museum pieces. So one is left with the choice of modern replacements, or nothing. And I'm not capable of building an RP0x, but building a board that uses an SD memory card to emulate an RP0x, that's within my grasp. And it takes a lot less room and power, to boot. Also, the _systems_ were designed to have upgrades installed, and did, BITD - many of which were not conceived when the machine first came out. E.g. our 11/45 at LCS wound up with 1MB MOS memory boards in it (much smaller and less power-hungry than the original memory), and high-speed LANs, neither of which were ever envisaged when the machine was built. I don't see that building, say, a UNIBUS USB interface now is really that different from building a high-speed LAN board BITD. I do agree that if you replace stuff that _is_ still available and perfectly functional (e.g. QBUS memory and processors), you might just as well run a simulator. But there's a lot of stuff that's not in that category (above). Noel

10 years, 2 months

2
1
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CDC 6600/Cyber 73 Memories - WAS: Harris H800 Computer

by rickb＠bensene.com

Mark J. Blair wrote: > I also seem to remember an operator's console with two round CRTs on it, > but I might have fabricated that memory from whole cloth. > I think that you were remembering the console of one of the Control Data 6000/Cyber-70 series computers that you may have seen somewhere. This series of Control Data machines were famous for their consoles with two large, round, green-phosphor monitors that used vector drawn-characters (generated by one of the Peripheral Processors). Most of the normal system screens were all text, but there were some special programs written (including a nice graphical chess game, a little program that would put up eyes on the screens that would look around and blink, and some others that don't come to mind at the moment. I operated one of these systems (a Control Data Cyber 73 -- http://bitsavers.trailing-edge.com/pdf/cdc/cyber/brochures/Cyber70_Mod73 _Feb71.pdf) at Tektronix in Beaverton, Oregon, from 1977 through around 1980. It had two CPUs, 131K (60-bit words) of core, ECS (extended core storage), and 20 Peripheral Processors, a combined punched card reader/punch, something like 12 "washing machine" type multi-platter cartridge disk drives (that held something like 300 MB each), two 9-track tape drives and one 7-track tape drive. It also had a big chain printer that was noisy, but pretty fast. The machine had a channel interface to a Modcomp communications processor (with communication maintained by one or more Peripheral Processor programs), that provided serial I/O to terminals scattered all over the company by some kind of serial concentrator that I can't remember. There was also a big modem pool for dial-in use. The system ran a locally-modified version of the Kronos Timeshared operating system. The system was used primarily by engineering departments (research and product development) for CAD and CAD software development, circuit simulation (SPICE), cross-assembling microprocessor code, and mathematical modeling. The machine was an all-transistor design, based on the CDC 6600 processor. It was liquid cooled, and had a large cooler unit that sat with the machine that cooled the coolant (water) and circulated it through the chassis, venting the heat (which was substantial) through a special venting system. I remember the CDC Field guys talking about horror stories when there were leaks in the cooling system. We never had any problems while I was there. One day I was at the console when one of the big high-voltage rectifier tubes that were in the console decided to short. I was watching one of the system monitor displays, and suddenly I saw the display collapse into a single very bright horizontal line. I noted that the other display also did the same thing. I also heard a funny noise that sounded kind of scary, so I started to push my wheeled chair away from the console, but not soon enough to avoid a shower of sparks and even some molten metal that spewed out from the console. I had a few small burns on my arms, and one little blob of molten metal burned a hole in my pant leg. One of the other operators in the machine room managed to hit the power switch for the console and shut it off. Then the fire suppression alarm went off indicating that the Halon was going to dump soon, so he ran back and hit the override since the sparking and smoke had settled once the power was off. Despite this, the fire department showed up (the fire suppression system in the computer room had a direct line to the fire department), and we had to tell them it was a (semi) false alarm. The machine kept running just fine, and we were able to keep tabs on it with a serial terminal hooked up to the machine that had a program running that kind of emulated the console displays. The CDC guys were there very quickly, and ended up having to replace two (IIRC) big rectifier tubes, and one burnt up power resistor. When they powered it up, the screens came up just as they were before the event occurred, and all was well. I really enjoyed those days. The machine was really cool, and I have a lot of great memories of those times. The Living Computer Museum (http://www.livingcomputermuseum.org) in Seattle, WA, has rescued a smaller version of a system like this based on the 6500 processor that is undergoing restoration. Sorry for changing the subject (but at least I updated it in the Subject: line). -Rick -- Rick Bensene The Old Calculator Museum http://oldcalculatormuseum.com

10 years, 2 months

5
8
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VCF East pictures

by cctalk＠ibm51xx.net

> Simplest just to read the article (it's not very long): > > http://www.swtpc.com/mholley/PopularElectronics/Feb1975/PE_Feb1975.htm > Thanks Bill. That is pretty cool! -Ali

10 years, 2 months

1
0
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Z80 /WAIT signal question

by spacewar＠gmail.com

A friend building a Z80 system asked me about whether the Z80 /WAIT signal has any effect during machine cycles that aren't memory/IO/intack cycles (i.e., neither /MREQ and /IORQ asserted). The user manual only describes the use of /WAIT for adding wait states, so I expect it probably only affects mem/IO/intack cycles, but I can't find anything definitive in the user manual. I'm hoping someone can save me the time of hooking up a logic analyzer and running the experiment. Thanks! Eric

10 years, 2 months

4
5
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CDP1861 PIXIE graphics chip replacement for COSMAC Elf

by spacewar＠gmail.com

In development. Inspired by the Spare Time Gizmos STG1861, but not based on that design. Rev. 0, not yet ready for production: https://www.flickr.com/photos/22368471 at N04/sets/72157667299828132 It is 2.0 inch by 0.7 inch, with a 24-pin round-pin DIP header to plug into a normal 24-pin DIP socket (vs. more the common square pins that won't work with normal IC sockets). The surface-mount components were assembled onto the board by a commercial service, which does not do through-hole, so I had to solder the DIP header by hand. I had to make the pads for the DIP header very small to squeeze the TQFP CPLD between the rows, so it turns out to be unsuitable for hand assembly by novices. Since I am not willing to do the hand assembly for other people, I'm not sure whether this board would actually be worth selling; I might have too many customers that aren't able to assemble it successfully. The CPLD programming is done by a "Tag Connect", which uses pogo pins to contact the ten gold pads seen on the top of the board. There are holes near those pads for the Tag Connect's steel alignment pins; while there is enough clearance on the top of the board, I failed to consider that the frame of the DIP header on the bottom of the board would prevent two of the alignment pins from extending far enough. I had to cut out part of the DIP header frame. The CPLD code has been written but has not yet been debugged.

10 years, 2 months

3
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shell accounts [was RE: strangest systems I've sent email from]

by RichA＠LivingComputerMuseum.org

From: John Willis Sent: Thursday, April 21, 2016 8:02 AM > That's another thing I remember and miss from those days... your average > ISP would provide NNTP and UNIX shell accounts, as well as a few megs of > space to put up a personal web site in ~/public_html. I still read Usenet newsgroups via GNUS under Emacs on my shell account on Panix, an ISP located in Manhattan, and have a small web site hosted there as well: http://www.panix.com/~alderson/index.html Some things are too important to relegate to a web browser. Rich Rich Alderson Vintage Computing Sr. Systems Engineer Living Computer Museum 2245 1st Avenue S Seattle, WA 98134 mailto:RichA at LivingComputerMuseum.org http://www.LivingComputerMuseum.org/

10 years, 2 months

7
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Harris H800 Computer

by kevin_anderson_dbq＠yahoo.com

I did not use the H800, but I cut my computing teeth on smaller Harris models in college (where my work study job was in the computer center, and I was also a computer science major) and then part-time employment afterwards with the Army Corps of Engineers, which was big on Harris computers at the time. This was in the late 1970s to mid-1980s. I used first a model H150 and then the H550 after they upgraded. I even worked for a contractor part-time who had a Harris H120 (I think that was the model number) in his basement for engineering computing. I don't remember what models the Army COE used at the time - H500s of one variant or another I believe. I thought these Harris computers were all a great system, the bees knees as far as I was concerned, far better than any full-blown PDP-11 system at the time (and no doubt cost more as well at the time). There are documents on these systems on Bitsavers. Everything was blue in color, and the console was a CRT that ran in block transmission mode, grabbing either one full line or the entire page off the screen at a time, feeding into the DMCP board. The H150 we had in college had two 80 Mbyte CDC drives, and later we added a 300 Mbyte CDC drive when we upgraded to the H550 model. The tape drive was a non-vacuum 1600 bpi drive, and I spent many hours backing up the system onto tape, and then swapping drive packs and downloading everything again. I vaguely recall that we did that drive swapping once a week in the wee hours of the morning. The Vulcan Operation System (VOS), which later was called VMS, I thought was a cool system, but then I didn't have anything to compare it against. We had Fortran, Basic, Cobal, RPGII, and assembler, plus a version of Runoff so students could write papers that got printed on a Diablo. I spent many hours on that system after hours (I had a key to the college computer center), and even started writing my own tape operating system for fun. We had terminals strung all over campus feeding into the system, connected by long runs of serial cables in the heating tunnels; I spent many hours in those heating tunnels as well, as we had to fix things every time lightning from storms would take out the RS232 chips at either the terminals or on the DMCP board in the computer. I got to know the area Harris field engineer pretty well - he was a chain-smoker that constantly had a cigarette in his mouth, even while working on the computer. I watched him do many a system upgrade to boards, which were all discrete TTL chips and parts that were wire-wrapped at that time. I'd love to know if any Harris computers still exist today. The ones I knew were all scrapped out years ago. I know if I tried to use one today, I'd get really frustrated with the OS, being as used to Linux/Unix as I am today. Harris did come out with a Unix OS for their computers in the mid-1980s, but I never used it. Fond memories. Kevin Anderson

10 years, 2 months

2
1
0 0

VCF East pictures

by cctalk＠snarc.net

Here are some photos from last weekend's show. Bill Degnan -- http://www.vintagecomputer.net/vcf11/ Herb Johnson -- http://www.retrotechnology.com/vcfe11/ Mike Loewen -- http://q7.neurotica.com/Oldtech/VCF-East2016/

10 years, 2 months

4
4
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High performance coprocessor boards of the 80s and 90s - was Re: SGI ONYX

by michael.99.thompson＠gmail.com

> > Date: Wed, 20 Apr 2016 20:08:56 -0400 > From: Toby Thain <toby at telegraphics.com.au> > Subject: Re: High performance coprocessor boards of the 80s and 90s - > was Re: SGI ONYX > > On 2016-04-20 8:02 PM, Michael Thompson wrote: > > > > I have a quad-860 VME board for Sun systems in my collection. > > > > Do you have the development environment for it? > > --Toby > Yes, but it is on a Sun 4/260 that us buried in my collection. -- Michael Thompson

10 years, 2 months

3
2
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Resolved: VAX-11/750 ECKAL (Cache/TB) Diagnostic failure

by derschjo＠gmail.com

Hey all -- I resolved the weird failure I was seeing on my 11/750 with the Cache/TB diagnostic and since it was fairly random I thought I'd share it to save people from the future (hi, people from the future!) from going through the same machinations I did. Issue: ECKAL diagnostic loads, prints banner and halts after about a second with: 00003488 06 No other diagnostic is provided, and since there don't appear to be any listings or real documents covering the test, it's not particularly helpful. What I tried (prior to tonight): - Checked voltages. - Double-checked backplane for bent/shorted pins. - Cleaned and reseated every socketed chip (especially the gate arrays). On *all* boards. - Swapped in a spare L0003 (after cleaning, as above). - Swapped in all the other spares I have (one at a time, again, after cleaning). - Cleaned backplane with contact cleaner. - Removed 2nd UNIBUS card. - Tried a *third* L0003 card (labeled "GOOD" as of 1996 :)). No change in behavior whatsoever. Very odd. Very frustrating. So tonight I thought, hey, why not disconnect the UNIBUS just in case something odd is going on there. Pulled the Unibus jumper connecting the two backplanes, replaced with terminator. ECKAL diagnostic now runs and passes. So: This particular fault (at least in this case) is due to some oddity on the UNIBUS. I suspect a problem with NPG grants, but I'm going to have to go over this with a fine-toothed comb, it could be a bad controller in there doing something mean. Hope this helps someone at some future date... - Josh

10 years, 2 months

1
1
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Harris H800 Computer

by nf6x＠nf6x.net

Back when I spent a couple of years at UNLV in the late 80s, I had a class in which I was forced to use an account on a Harris H800 computer, if my memory serves me correctly. Being a BSD snob, I felt that was a terrible imposition, much like being forced to calculate compound interest on a stone-age abacus made from partially petrified dinosaur turds. *Without gloves.* Now, of course, I'm a lot more easy-going, and downright curious about things that might not have been my first choice for a computing environment. Even VMS! So, does anybody here know anything about that family of computers? I seem to recall getting a tour of the computer room once, and the two front panels of the machine were swung open to reveal two thick, mattress-like beds of twisted pair wires. That seemed nauseatingly primitive to me at the time, but now the memory seems fascinating. I also seem to remember an operator's console with two round CRTs on it, but I might have fabricated that memory from whole cloth. -- Mark J. Blair, NF6X <nf6x at nf6x.net> http://www.nf6x.net/

10 years, 2 months

11
16
0 0

Using a Gotek-type flash floppy emulator inside a C1581

by echristopherson＠gmail.com

I wonder if there are any Commodore people out here who could tell me what practical differences would result from using a Gotek-type flash-memory-based floppy emulator in place of the C1581's mechanism, vs. using Jim Brain's uIEC-SD or similar. I don't know if the thing would even work in a 1581 case, or if Commodore DOS or JiffyDOS would work with it; but if so, I wonder if the DOS would work slightly more like the real thing, because it would be actual C=/JiffyDOS running on an actual 6502, instead of something new running on a microcontroller. I understand that you wouldn't get any of the directory-changing commands et al. from the SD2IEC firmware. -- Eric Christopherson

10 years, 2 months

2
1
0 0

High performance coprocessor boards of the 80s and 90s - was Re: SGI ONYX

by jnc＠mercury.lcs.mit.edu

> From: Josh Dersch > It's actually a SCSI device the size of a refrigerator. Given all the largish machines you have, you must have either i) a warehouse, or ii) a very large basement and a tolerant SO! :-) Noel

10 years, 2 months

2
1
0 0

[OT] Alternatives to eBay

by sales＠elecplus.com

I have spent over 100 hours looking for viable alternatives to selling computer stuff. Vintage does not have its own place. Bonanza.com is gaining popularity, but it is not really IT or electronics oriented. Pricewatch.com and similar sites only deal in reasonably current equipment. VCF does have a marketplace section, but (and please don't take offense) it is so rudimentary, and the listings are so outdated, that is does not seem to be of much use. How do you find what is still available? True auction or ecommerce software would eliminate stale WTB and WTS listings. There are many free places to send XML product lists to be added to their comparison shopping engines, and all of those are very well indexed by Google. If you make it easy for people to see that it is an open place to buy and sell, 1 page registration, etc., then it will probably grow quite well. If you really want it to grow, you can get free press releases with many of the computer related online magazines and communities. If you don't try it, you will never know J Thoughts? Cindy Croxton Electronics Plus

10 years, 2 months

8
8
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1998

1997

test-drb