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

Computer Museum looking for a new home Starting bid: US $99, 000.00 (Reserve not met)

by eric＠rothfus.com

(not sold by me & cross-posted from another list) "The entire Freeman PC Museum is offered for sale. David Freeman, founder of ACP Superstore, has been collecting computers since 1976. As a pioneer in computer retailing Mr. Freeman started early collecting. This collection represents almost 30 years of collecting. To date over 280 computers have been place online at www.thepcmuseum.net. There are approximately 600 computers, calculators, printers, video game consoles in the collection. Not all of the computers have been placed on the website as of yet, but all are included in this sale. Everything is included. Many items in this collection are irreplaceable and no longer available. This collection includes countless software titles, manuals, books, magazines and other computer memorabiia. You could truly display a PC Museum in your place of business with this collection...." http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5125710949

21 years, 6 months

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Relay computers - OR functionality

by dwight.elvey＠amd.com

>From: "Ron Hudson" <ron.hudson(a)sbcglobal.net> > >I had, at one point, sat down and tried to devise a JK flipflop out of >relays.. > >I can do a latch... where (in) pulls in the relay and a NO contact >connects >v+ to keep the relay in.. but everything I tried just vibrated... :^\ > >In a relay computer wouldn't one need flipflops for memory? > I thought I'd take on the challenge. Doing a JK with relays. First, define the clocking and, for Sellam, the state of the contacts. I will define relays as numbers and there contacts as O for normally open and C for normally closed. As an example R1C will be one of the normally closed contacts. If this name is used multiple times, it may indicate more than one set of contacts, depending on the optimization used. There will be 4 clocks. It will look as: One cycle of clock. P0 C O C C C C ( Hold clock for R1 ) P1 O C C O O O ( evaluate clock for R1 ) P2 C C C C O C ( Hold clock for R2 ) P3 O O O O C C ( evaluate clock for R2 ) O means open contact at that time and C means closed during that time. The JK flop is composed of two relays, R1 and R2. R2 contacts correspond to the Q and Q* outputs( R2O and R2C ). R1 or R2 by itself would be the coil. I also show the complete path from rail to return, even if it is duplicated at some points. JO and KO are normally open contacts of some other relay that when activated is the logical signal corresponding to J and K. Wiring: Rail to R1O to P0 to R1 to return Rail to R2O to KC to JC to P1 to R1 to return Rail to JC to KO to P1 to R1 to return Rail to R2C to JO to KO to P1 to R1 to return Rail to R2O to P2 to R2 to return Rail to R1O to P3 to R2 to return I would not use a JK flop for a memory array, even if I was using normal relays for the memory. The are too wasteful of contacts and coils. There is some optimization that could be done with diodes as well. One can generate the clocks with relays or some kind of distributor, similar to what is used on a teletype and a variable speed motor. If done with relays, one would need some way to control the speed. It might make sense to invert the signal between the two relays so that regardless of the state, only one relay, on averagel would be on at a time. Dwight

21 years, 6 months

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Harvard vs. vonNeuman

by dwight.elvey＠amd.com

>From: "Tom Peters" <tpeters(a)mixcom.com> > >I use a lot of self-modifying code: Perl scripts that generate HTML code! > >Maybe that doesn't count... > Hi Tom Only counts if it then calls the HTML is generates. Dwight

21 years, 6 months

2
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Relay computers - OR functionality

by dwight.elvey＠amd.com

>From: "Vintage Computer Festival" <vcf(a)siconic.com> > >On Mon, 27 Sep 2004, Dwight K. Elvey wrote: > >> In my logic, 'A' would indicated the normally opened contact >> an 'a' would be the normally closed contact for relay A. >> I'll use + to indicate OR and . to indicate AND. > >You already lost me. You may as well have used ! and $ instead of A and >a. > >:) > >P.S. C programming convention (which most people would relate to >immediately) says that next time you should use & for AND and | for OR. > >-- Hi I'm sorry, people doing logic have been using + and . a lot longer than C has been using & and |. I specifically stated what I would use. Look at most any pre-C math book and you'll most likely see the + and . used for OR and AND. These are just symbols until one applies meaning to them. I don't see the issue. One should be able to adapt to different conventions because that is the way things will be represented >from different sources. I adapt and I hope others learn to do it as well. I don't see the issue with using upper and lower case to indicate normally close or normally open? What difference does it make how one represents it? Dwight

21 years, 6 months

5
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MIPS R6000 and R8000 manuals, real 680x0, and others...

by jfoust＠threedee.com

I recently had an email conversation with Ralf Baechle <ralf(a)linux-mips.org> regarding some manuals he'd scanned: > Yes, if you have other old manuals, I will pass them > along to other classic computer archivists. Did you > can them yourself or did you collect them from the net? Both. The ones I scanned myself are the R6000 and R8000 manuals - extremly rare documents. I managed to get hold of them while still working for SGI and only recently got permission from MIPS Technologies to publish the manuals. The two manuals would be the R6000 and R8000 manuals. They're available via ftp on bacchus.net.dhis.org:/pub/mips/ I also scanned manuals for the WD33C93 and WD33C95 SCSI chips. Those however I don't have permission to publish, so they're not on my ftp server. And of course a whole bunch more that I downloaded from random places on the net over the past decade ... I btw convert my scans into PDF files for which nice reader software is available. [...] I found proper 68000, 68020, 68030, 68040 and 68060 manuals on the net, that is "real" pdf files, not scans. These are the URLs: http://www.freescale.com/files/archives/doc/ref_manual/M68000PRM.pdf http://www.freescale.com/files/archives/doc/ref_manual/M68000PRMER.txt http://bellota.ele.uva.es/~jesus/datasheets/motorola/68000UM.pdf http://dac.escet.urjc.es/docencia/Micros/DataSheet/CPU/motorola/68020um.pdf http://dac.escet.urjc.es/docencia/Micros/DataSheet/CPU/motorola/68060um.pdf http://dac.escet.urjc.es/docencia/Micros/DataSheet/CPU/motorola/060d.pdf http://www.tornado.nsk.ru/support/docs/68030UM.pdf http://www.tornado.nsk.ru/support/docs/68040um.pdf And this one is scanned but given the age I wasn't exactly expecting a Postscript or PDF file ... http://bellota.ele.uva.es/~jesus/datasheets/motorola/6809.pdf Ralf

21 years, 6 months

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Relay computers - OR functionality

by dwight.elvey＠amd.com

>From: "Vintage Computer Festival" <vcf(a)siconic.com> ---snip--- > >None, I just felt like pointing out that whoever decided to use the plus >sign for OR was most likely insane. Hi Actually from a mathematical sense, it does make sense. The OR operation can be mapped to the plus operation and the AND operation can be mapped to the multiply operation. One finds that when doing this, many mathematical rules correlate nicely. That is why it was done. Rules like associative and communicative make sense. It wasn't just wild insane mad men. When one understands the reasoning fully, one can except the choices made. It is just that in your schooling, you were never exposed to much Boolean algebra. That is too bad because so much of what we do with computers requires a level of understanding of how it works. Dwight

21 years, 6 months

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Relay computers - OR functionality

by dwight.elvey＠amd.com

>From: "Steve Thatcher" <melamy(a)earthlink.net> > >you create your OR functionality with diodes - use two diodes (or as many inputs as you need) such as the 1N4001 for your inputs. Tie the cathodes together and attach that to the relay coil. Apply "logic high" (whatever voltage your relays operate at) to either (or any) diode anode and the relay will turn on. The relay can be the next stage and does not have to be there to implement the OR. > >best regards, Steve Thatcher > Hi You don't need the steering diodes if the lines that provide the terms don't cross talk to other coils. This is pure relay logic and works with AC relays as well as DC. The diodes are only needed when you share complex terms that use the same stack of contact terms but would otherwise cross talk. The diodes allow one to optimize the number of contacts used by sharing common terms. Each relay contact can be used as a term in an equation. Normally open contact can provide inverting function and normally closed contact can provide isolation buffering ( needed for AC but can be optimized with diodes in DC ). Designing with relays takes a slightly different mindset than with normal logic, like TTL. You have to think in terms of inverters and transmission gates. There are no NAND or NOR gates. The function of NAND and NOR is constructed by sharing the contacts of several relays and then using that shared stack to control the output ( that may be another coil of a relay ). Stacking contacts can provide AND like function and paralleling contacts can provide OR like function. Choice of normally open contacts provides OR and AND with inverted inputs, the Boolean equivalent of NAND and NOR. This takes a little more thinking of design because with double throw relays, one has to think of the source as providing the inverting and non-inverting signals. The contacts only provide OR and AND, depending on how they are arranged. Dwight > >Question: Wouldn't it be easier to implement an OR gate with no relays at >all (just two wires joining together)? Or would you need to use the relays >to keep the output voltage/amperage regulated? > > >Cheers, >Ade. > >

21 years, 6 months

5
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Real PDP11 model question

by ron.hudson＠sbcglobal.net

Were there any PDP11's as small as the DECmate III?

21 years, 6 months

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Speaking of Byte ...

by dave04a＠dunfield.com

I was just recently given a good sized collection of early Byte magazines. I've inventoried them, and it is a complete series from Issue #2 (October 1975) all the way through to Volume 8, #8 (August 1983) - EXCEPT for Vol 6, #7 (July 1981). .. So .. if anyone should happen to have a copy of Byte Vol 6, #7 (July 1981) that they would part with - please let me know. I also wouldn't mind completing the 1983 year, so Sep, Oct, Nov, Dec 1983 would be of interest as well. [I'd *REALLY* like to get the one missing on the other end as well, (Issue #1) however I expect it would be much harder to find!] Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Vintage computing equipment collector. http://www.parse.com/~ddunfield/museum/index.html

21 years, 6 months

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Harvard vs. vonNeuman

by dave04a＠dunfield.com

>Part of the issue, for modern machines, is that the hardware gets in >the way. If you change code, the I-cache doesn't change (in machines >I'm familiar with) so the old instruction may still execute. This >makes instruction modification a tricky business. Debuggers do it, >operating systems do it -- and both have to pay attention to all the >cache magic you have to perform for it to be right. This reminds me of a point I wanted to make earlier and forgot - another big issue us that SOFTWARE gets in the way! - todays computing world is much more oriented toward sharing code, and many systems support multiple execution threads of a single copy in core - it causes bad things to happen when one of those threads changes the code :-) Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Vintage computing equipment collector. http://www.parse.com/~ddunfield/museum/index.html

21 years, 6 months

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Self Modifing Code was RE: Harvard vs. vonNeuman

by dave04a＠dunfield.com

I used to use a lot more self-modifying code in my early days then I do now, you could save precious bytes of memory by storing data values into the immediate operand of instuctions which used them --- I recall a "turning point" when one day I spent a fair bit of time debugging a problem which was related to two level deep self-modifying code - ie: Modified an instruction so that it would subsequently modify another instruction differently - I started to believe some of the nay-sayers about the evils of SM code after that :-) Case where I've *HAD* to use SM code: 8080 general purpose monitor - no way to read/write arbitrary I/O ports - have implemented it both as directly SM code in RAM based monitor, and as a "built" subroutine in RAM for ROM based monitor. Same for 8051 (except you have to overlay CODE and DATA address spaces obviously - this is fairly normal for a debugging environment). Cheers, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Vintage computing equipment collector. http://www.parse.com/~ddunfield/museum/index.html

21 years, 6 months

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Relay computers - OR functionality

by melamy＠earthlink.net

if you have telephone relays, then buzzing is not an issue. The ones I used years ago would "always" make contact. I used the N.O. contact to apply power to the relay once it received a pulse. I can't tell you now how long the pulse had to be (too long ago). Even if you wired the relay as a buzzer, it still made complete contact before returning to the open position. It would "buzz" at around 10-20hz. >I can do a latch... where (in) pulls in the relay and a NO contact >connects >v+ to keep the relay in.. but everything I tried just vibrated... :^\ > >In a relay computer wouldn't one need flipflops for memory? > > > You just have to think about what happens while the relay is actuating and all the contacts may be open ( break-before-make ). Otherwise, you'll be making a lot of nice buzzers. More than one phase of clock makes things easier. Dwight

21 years, 6 months

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DEC PRO software

by waltje＠pdp11.nl

Hullo, As a result of me taking over another (Dutch) collector's DEC systems, I now have filled a major gap in my own collection: the Pro 3xx series have been added. That is to say: I have a 350 in the US (a VAX console), and this lot came with both a 325 and a 380. The 325 seems to be a field-upgraded one, as it comes in the "usual" Pro box, not the smaller one, and it was stuffed with RAM, options and a hard disk. So, I guess I am still looking for the "small" 325 ;-) Anyway. The lot also came with a truckload of boxes (binder boxes, ya know) and floppies, so I am now Teledisking all those floppies for later use. I'll add these to my Archive, under the Software>POS section. All manuals will be auto-feeder scanned later, and the results will also be in the Archive, under Hardware>PRO300. Is anything PRO-related online already, other than the update.se archive with Venix and some P/OS images? I seem to have: - P/OS V1.5 - P/OS V2.0 - P/OS V3.0 - P/OS V3.2 - PRO/TK V3.0 - PRO/TK V3.2 - Cobol-81, Pascal, F77, Forth for TK - DECnet/PRO V2.1 plus Toolkit - PRO/Sight V1.0 - PRO/Synergy V1.0 - PRO/COMM V3.0 .. and more to unpack. If anyone wants copies or a trade, lemme know off-list ! PRO-related hardware is always welcome, too... *hint* Cheers, Fred -- Fred N. van Kempen, DEC (Digital Equipment Corporation) Collector/Archivist Visit the VAXlab Project at http://VAXlab.pdp11.nl/ Visit the Archives at http://www.pdp11.nl/ Email: waltje(a)pdp11.nl BUSSUM, THE NETHERLANDS / Mountain View, CA, USA

21 years, 6 months

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Relay computers - OR functionality - symbology

by dwight.elvey＠amd.com

>From: "Vintage Computer Festival" <vcf(a)siconic.com> > >On Tue, 28 Sep 2004, Steve Thatcher wrote: > >> when someone can pick up a logic description and understand it WITHOUT >> having to figure out what each sytmbol means in the context of the >> usage, then it is simply more understandable. If I picked up something >> that had two binary numbers wiht a PLUS sign inbetween, I would not >> assume that it meant OR, only if you would dig further does the PLUS >> sign make sense. If you simply said OR, then there is no confusion and >> it is self documenting. I think Sellam was trying to make this point >> with regards to symbology. > >Right. What I was getting at is that there were plenty of other symbols >on the typewriter or keypunch to choose from. > >Having gotten the explanation as to why those operations were chosen, it >does make sense and is somewhat elegant (I'll reluctantly concede), but >it's still stupid as far as I'm concerned. Why didn't they use * or X >for AND then? Hi Sellam Some do use * or X. Would that have helped you? Although, others seem to to describe things like set theory, I can show a simple example of the practical use. A.(B+C) = A.B + A.C ( just like ordinary math ) A+(B+C) = (A+B)+C ( again, just like ordinary math ) Other than that, I don't think there is a good reason. Dwight

21 years, 6 months

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Relay computers - OR functionality

by dwight.elvey＠amd.com

>From: "Ron Hudson" <ron.hudson(a)sbcglobal.net> > >I had, at one point, sat down and tried to devise a JK flipflop out of >relays.. > >I can do a latch... where (in) pulls in the relay and a NO contact >connects >v+ to keep the relay in.. but everything I tried just vibrated... :^\ > >In a relay computer wouldn't one need flipflops for memory? > > > Hi The problem you have is controlling delays. In designing things, you need to consider things like setup and hold timing as well as race conditions. In normal circuits, a flip-flop is composed of two latches with opposite clocks. In normal design, one needs to either make these two clocks non-overlapping or if one clock slightly overlaps the other, the data path between a previous flop and the next have sufficient delay that they won't race. Memories are normally composed of simple latches and not flipflops. Most uP use mostly latch based design and not flop base. Most ASIC's are still using flop based design but they don't have the same speed requirements that uP's have. Another problem you may have been having is that you didn't consider the contacts as being break-before-make or make-before- break types. As was mentioned earlier, some of the relays have things like shunting coils ( loop of copper ) added to allow the relay to hold longer. One can also do things like add capacitors in parallel to the coils to hold a few milliseconds. It is easiest to just use some overlapping clocking system. You just have to think about what happens while the relay is actuating and all the contacts may be open ( break-before-make ). Otherwise, you'll be making a lot of nice buzzers. More than one phase of clock makes things easier. Dwight

21 years, 6 months

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Yahoo! News Story - Floppy Disk Becoming Relic of the Past (fwd)

by vcf＠siconic.com

I told ya so! http://story.news.yahoo.com/news?tmpl=story&u=/ap/20040906/ap_on_hi_te/flop… ath_4 Mon Sep 6, 5:17 PM ET By MARK NIESSE, Associated Press Writer ATLANTA - Long the most common way to store letters, homework and other computer files, the floppy disk is going the way of the horse upon the arrival of the car: it'll hang around but never hold the same relevance in everyday life. And good riddance, say some home computer users. The march of technology must go on. Like the penny, the floppy drive is hardly worth the trouble, computer makers say. Dell Computer Corp. stopped including a floppy drive in new computers in spring 2003, and Gateway Inc. has followed suit on some models. Floppies are available on request for $10 to $20 extra. "To some customers out there, it's like a security blanket," said Dell spokesman Lionel Menchaca. "Every computer they've ever had has had a floppy, so they still feel the need to order a floppy drive." A few customers have complained when they found their new computers don't have floppy drives, but it's becoming uncommon as they realize the benefits of newer technologies, Menchaca said. Almost all new laptops don't come with a floppy. More and more people are willing to say goodbye to the venerable floppy, said Gateway spokeswoman Lisa Emard. "As long as we see customers request it, we'll continue to offer it," she said. "We'll be happy to move off the floppy once our customers are ready to make that move." Some people may hesitate to abandon the floppy just because they're so comfortable with it, said Tarun Bhakta, president of Vision Computers outside Atlanta, one of the largest computer retailers in the South. At his store, the basic computer model comes with all necessary equipment, but no floppy. "People say they want a floppy drive, and then I ask them, 'When was the last time you used it?' A lot of the time, they say, 'Never,'" Bhakta said. But plenty of regular, everyday computer users don't want to let their floppies go. "For my children, they can work at school and at home. I think they're a pretty good idea," said shopper Mark Ordway. "I just want something simple for me and my husband to use," said Pat Blaisdell. The floppy disk has several replacements, including writeable compact discs and keychain flash memory devices. Both can hold much more data and are less likely to break. Even so, floppies have been around since the late 1970s. People are used to them. They were the oldest form of removable storage still around. "There's always some nostalgia," said Scott Wills, an electrical and computer engineering professor at Georgia Tech who has held on to an old 8-inch floppy disk. "It's a technology I'm glad to be rid of. I'd never label them, and I never knew what any of them were until I put them in and looked." In a sense, it's amazing floppy disks have hung around for this long. They only hold 1.44 megabytes of space  still enough for word processing documents but little else. By comparison, CDs store upward of 700 megabytes, and the flash memory drives typically carry between 64 and 256 megabytes. And it's been a long time since floppy disks were even floppy. They used to come in a bendable plastic casing and were 5.25 inches wide, but Apple Computer Inc. pioneered the smaller, higher density disks with its Macintosh (news - web sites) computers in the mid-1980s. Then Apple become the first mass-market computer manufacturer to stop including floppy drives altogether with the release of their iMac model in 1998. "It's not officially dead, but there's no question it's a slow demise," said Tim Bajarin, principle analyst for Creative Strategies, a technology consulting firm near San Jose, Calif. "You had a few people ... who were screaming, but in a short time, they adjusted." It may not be too many years before floppy disks are joined by DVDs. Microsoft founder Bill Gates (news - web sites) recently predicted the DVD would be obsolete within a decade. -- 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 ]

21 years, 6 months

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Survived another one!

by mmcfadden＠cmh.edu

Actually I feel sorry for people that want uniform weather and climate. I also feel sorry for any classic computer that has to survive out in the weather in Florida or the Midwest. /fun on What a bunch of wimps, a little wind and water and everyone wants to leave town. 100 mile wide storm and you can see them coming for days. Here in the Midwest we like our wind and storms a little more concentrated, tornados are a lot more fun. You can see them coming and do the "just barely missed me trick". The sneaky thing about tornados is that they can come at night and you can't see them. They have professional storm chasers for hurricanes with planes, for tornados amateurs in cars. On our lake we always are interested to check the wind speed meters to see how bad it was. I've only retreated under the concrete porch once and watched the neighbor's boat and boat dock flip up into the yard upside down. Weather was clear in about 2 hours. Instant storm, instant storm gone. I keep some of the classic computers in the garage attic to keep the house "down". My wife has only visited there once and made a comment "what's all this stuff". I put it in the attic when the garage was built. There is a nice National Weather Service Doppler radar site very near us, you can watch their web page and when the red storm zone is in the center it's on top of us. /fun off Mike

21 years, 6 months

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Job change and shameless plug

by jwest＠classiccmp.org

Sorry I've been more unresponsive to email than usual lately. I've been going through a rather gutwrenching job decision - right during the middle of a major implementation for my current day-job employer. The counter offers have been made and delt with and the dust has settled so things should start to get back to "normal" very shortly. Well, actually, better than normal. The new job I'm taking is almost the same pay but only 3 days a week - work >from home - with full benefits and total flex time (yes, it's a real IT job, not an MLM *GRIN*). Needless to say, this will give me more time with my collection, this list, etc. It will also allow me to spend much more time growing my consulting practice and internet service (web hosting and colocation), which is really what I want to do full time. So needless to say - if anyone is aware of any consulting/support opportunities in the areas of FreeBSD Unix, sendmail, Bind, apache, mysql, etc. I'd love to hear it. My particular specialty is high availability clustering of both apache and mysql. I'm targeting true consulting rather than contracting. I'm not looking for long term contracts. Just ongoing support, maybe a day onsite occasionally if need be. I can do most things remotely but have no problem traveling either. I'm also a good C programmer but I really prefer to keep that to the hobby side of things. In addition, I'm definitely looking for companies who need a firm to host their website or wish to colocate gear. I've been very pleasantly suprised so far at just how quickly a lot of cheap web hosting customers can add up to real dollars! I won't repeat my diatribe on my datacenter - suffice it to say it's a world class datacenter with serious connectivity - not a couple of servers in my basement. Who knows... might even try to find some companies who still run 21MX gear and want hardware support (lord knows I've got the excess inventory), or maybe I can finally start real work on getting that computer museum off the ground :) Regards, Jay West --- [This E-mail scanned for viruses by Declude Virus]

21 years, 6 months

1
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M-series at govt. auction

by jwest＠classiccmp.org

I was thinking about going for the M series at govt. auction mentioned on the list previously. I noted the condition was F7, which means "broken, repairable" or "needs refurbishing". I don't usually buy stuff there... can anyone advise me if F7 is likely to be something as serious as a dead mainboard? Or could it just be and I/O or memory PCA? Any thoughts? Jay

21 years, 6 months

2
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Axlon Ramdisk 320 ???

by rigdonj＠cfl.rr.com

I found this this morning. Anybody know anything about it? I found an Apple Disk II external full height 5 1/4 disk drive in the same lot and this is the same style, size and color so I'm guessing that it might be made for use with an Apple II. However it does have one important difference, it uses a 34 pin ribbon cable instead of the 20 pin like the Apple drive does so it definitely uses a different interface. Joe

21 years, 6 months

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M-series at govt. auction

by Innfogra＠aol.com

My bet from looking at the pictures is nothing is wrong with them. The one pictured looks quite clean and the gaylord (big box) seems to have been carefully packed. Probably missing hookup cables, maybe missing some cards but probably not. What it means is not everything is there to make it work but it looks like it might (repairable). If you can go look at them it is a good idea. It is a long time before the sale ends. Looks like a good one to watch. My bet is they ran test equipment for the F16 that was obsoleted and are pretty complete. good luck. Paxton Astoria, OR

21 years, 6 months

2
1
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rewriting legacy OS for new iron

by ron.hudson＠sbcglobal.net

Would there be any interest in re-writing somthing like RSTS/E, ITS, TWENEX or one of the other legacy OS to work on x86 machines? The idea would be to do something like Linux has done for unix but for one of the other OSs, I think all the ones I mentioned ran on pdp machines, whatever we choose to write could have once run on anything. The new OS should be entirely self hosting. What would be the most interesting old OS to do. This would differ from the simh machines in that actual serial ports would connect to serial devices and printers would connect via parallel port.

21 years, 6 months

12
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Relay computers - OR functionality

by dwight.elvey＠amd.com

Hi I thought I'd show a case where one might want to use diodes. In my logic, 'A' would indicated the normally opened contact an 'a' would be the normally closed contact for relay A. I'll use + to indicate OR and . to indicate AND. Lets say we wanted to create the equation: X=(A.B)+(C.D) We can stack the normally open contact of A in series with a B contact. We can then parallel these with the series of C and D. The output of these can be tied to the coil of X. Now say we also needed: Y=(A.B)+(E.F) We would have to used a new set of contacts for the A.B term because the wires work both ways. If we were using DC relays, we can add a pair of diodes in series with the two AND'd terms used to drive each X and Y. This reuses the same contacts to drive both X and Y. So, as you can see, the diodes are not necessary but can be used to save on the number of isolated contacts needed. One can also play boolian games with these equations to do things like reduce total power required. Since each relay is assumed to have both inverting and non-inverting outputs, one can change where things are inverted: y=(a+b).(e+f) If the case is that Y would be more likely to be active, this second equation makes more sense for power. You can see here that we have optimized the power without doing anything other than change a few wires. We may have also minimized the need for extra contacts and or diodes. Like I said, designing with relays takes a different way of looking at the problem. One can also see that the OR function can be created by putting contacts in series or in parallel, depending on the active state of the relay that one is driving. The same goes for the AND function. This adds another flavor to things because one can move which side of the relay one places the term to optimize, power, delay or number of contacts used. Dwight

21 years, 6 months

4
3
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78MGT2 and 79MGT2

by tothwolf＠concentric.net

On Mon, 27 Sep 2004, Dwight K. Elvey wrote: > >From: "K. Venkataramanan" <rvtechno(a)vsnl.net> > > > >Hi there > > > >I saw your posting. I think I know where I can pick up these > >Regulators. Do you have the datasheets / pinouts so that I can test > >them? > > Hi Venkat > These sound like standard 78xx and 79xx series regulators. The 78xx > stuff are positive output and the 79xx are negative output. The pinouts > on these are relatively standard for each particular package. Note that > the negative and positive use different leads in the same package. It > would seem that these are 2 volt regulators but I don't recognize the > MGT package type. Look on the Jameco web page under regulators and I'm > sure you'll find data sheets for similar regulators. I believe the email he was responding to was one I posted in 2002. The regulators in question are Fairchild uA79MG and uA78MG. They are 4-terminal adjustable voltage regulators with a package style similar to a typical TO-220. The actual Fairchild part number of the regulator that I'm still hunting for is uA79MGU1C. I have the Fairchild voltage regulator databook and responded to the poster off-list. If someone has an electronic copy of the datasheet for these regulators, speak up as it will save me the trouble of scanning the relevant pages from the databook. -Toth

21 years, 6 months

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78MGT2 and 79MGT2

by dwight.elvey＠amd.com

>From: "K. Venkataramanan" <rvtechno(a)vsnl.net> > >Hi there > >I saw your posting. I think I know where I can pick up these >Regulators. Do you have the datasheets / pinouts so that I can test them? > >Venkat VU2KV > > Hi Venkat These sound like standard 78xx and 79xx series regulators. The 78xx stuff are positive output and the 79xx are negative output. The pinouts on these are relatively standard for each particular package. Note that the negative and positive use different leads in the same package. It would seem that these are 2 volt regulators but I don't recognize the MGT package type. Look on the Jameco web page under regulators and I'm sure you'll find data sheets for similar regulators. Dwight

21 years, 6 months

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Relay computers - OR functionality

by dwight.elvey＠amd.com

>From: "Tom Jennings" <tomj(a)wps.com> ---snip--- > >Though there's always selenium rectifiers, ugh. Besides being toxic, >huge, hot, they are slow and terrible forward/reverse ratio, though >likely faster than a relay. They've been around for a long time, I >wonder how good they' be as a relay signal diode (shudder). > > Hi They should work. They even have a slight advantage as diodes to absorb the flyback energy in DC relays. The increased forward voltage drop means a quicker release of the relay. Also, I though I'd mention that most AC relays have a small copper shunt coil to help delay the release of the relay between cycles. This keeps the relay >from chattering at 60Hz ( 50Hz for UK and Japan ). I would guess the coil does the same thing for a DC relay. Dwight

21 years, 6 months

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Relay computers - OR functionality

by dwight.elvey＠amd.com

>From: "Dwight K. Elvey" <dwight.elvey(a)amd.com> > >>From: "Steve Thatcher" <melamy(a)earthlink.net> >> >>you create your OR functionality with diodes - use two diodes (or as many >inputs as you need) such as the 1N4001 for your inputs. Tie the cathodes >together and attach that to the relay coil. Apply "logic high" (whatever voltage >your relays operate at) to either (or any) diode anode and the relay will turn >on. The relay can be the next stage and does not have to be there to implement >the OR. >> >>best regards, Steve Thatcher >> > >Hi > You don't need the steering diodes if the lines that provide the >terms don't cross talk to other coils. This is pure relay logic >and works with AC relays as well as DC. The diodes are only >needed when you share complex terms that use the same stack of >contact terms but would otherwise cross talk. The diodes allow >one to optimize the number of contacts used by sharing common >terms. > Each relay contact can be used as a term in an equation. Normally >open contact can provide inverting function and normally closed >contact can provide isolation buffering ( needed for AC but can >be optimized with diodes in DC ). Oops!! Should have said normally closed provide inverting and normally open provide buffering. > Designing with relays takes a slightly different mindset than >with normal logic, like TTL. You have to think in terms of >inverters and transmission gates. There are no NAND or NOR >gates. The function of NAND and NOR is constructed by sharing >the contacts of several relays and then using that shared >stack to control the output ( that may be another coil of >a relay ). > Stacking contacts can provide AND like function and paralleling >contacts can provide OR like function. Choice of normally >open contacts provides OR and AND with inverted inputs, >the Boolean equivalent of NAND and NOR. > This takes a little more thinking of design because with double >throw relays, one has to think of the source as providing the >inverting and non-inverting signals. The contacts only provide >OR and AND, depending on how they are arranged. >Dwight > > >> >>Question: Wouldn't it be easier to implement an OR gate with no relays at >>all (just two wires joining together)? Or would you need to use the relays >>to keep the output voltage/amperage regulated? >> >> >>Cheers, >>Ade. >> >> > > >

21 years, 6 months

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Made first phone call

by msokolov＠ivan.Harhan.ORG

jos de waal <jos_dewaal(a)hotmail.com> wrote: > I've asked my wife for her opinion on this and she said that she > would instantly scrap and toss my stuff if she ever found herself in > a similar situation. I can't blame her. Have you instantly divorced her after hearing that in order to ensure the safety of your collection? I can't understand why everyone here is having so much difficulty with their wives. Why did you marry them in the first place? Why in the world would you want to marry someone who has no respect for your most important Life's Work? I would never even *date* a woman who does not share my most core beliefs, and she must agree to protect our property with her life before there can be any talk of marriage. MS

21 years, 6 months

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Gemini / Xebec

by respley＠gmav.demon.co.uk

Hiya I found your email address while searching for information on Gemini computers and Xebec controllers. I?ve recently acquired a Gemini Galaxy 3 with a hard drive but the version of CP/M it came with does not have the any software for the hard drive. Basically do you have a any Gemini utility software for the hard drive, and if so, can I please get a copy. Many thanks Richard --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.769 / Virus Database: 516 - Release Date: 24/09/2004

21 years, 6 months

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HP Printers

by Watzman＠neo.rr.com

"50 Service" on an HP printer means that the fuser is not working (not reaching an acceptably high temperature within an acceptable time period, or, rarely, it's stuck on and overheating). In these particular models, the fuser is a heated roller system, there is a pressure roller (silicone rubber with a special "oil" on it to prevent sticking) and a heating roller, a hollow aluminum tube (also with a special silicon coating) with a heating element inside it. The heating element is a very high power cylindrical quartz lamp running the length of the center of the aluminum tube. The most likely cause of your problem is that the lamp has burned out, although there are other possibilities (rare, however). These can be replaced, but it may not be economical to do so. Also, examine the roller carefully, if any of the coating on the hollow aluminum tube has worn off, the tube should be replaced also (at some point, bare aluminum will literally leave brown scorch marks on the paper). These parts are available, but expect to pay $30 to $50 each for a new lamp and tube. The job is not that difficult if you know what you are doing, but substantially more difficult if you don't (big surprise, right?). You may be able to buy an entire working fuser assembly for less, but the lamp may have thousands of hours on it and the roller may be well worn. If you plan to keep the printers, a "true fix" with new parts really is the best way to go. Be careful working in this area, the lamp is AC line operated, and the roller is heated to nearly 400 degrees F. There are both shock and burn hazards. I have an actual factory service manual for the Laserjet II, I may scan it and make it into a PDF for the classic computer documentation effort. However, unlike Imsai, Altair, etc., HP is very much still in business and may take legal action if their copyrighted manuals are put on the web or otherwise distributed. I have found Laserjet IV service manuals on the web, and I have them downloaded. Just a note on economic viability, you can buy entire working HP 4 printers -- HP 4 Plus, the 12ppm version -- for well under $50, so putting in a $60 repair on a vastly inferior Laserjet II is of questionable economic viability.

21 years, 6 months

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Think back to VCF '97...

by mross666＠hotmail.com

Just found this on James Willings old site: http://www.rdrop.com/~jimw/jcgm-vcf.shtml Scroll down near the bottom; there is a picture of a 'DECsystem 10 I/O rack'. Does anyone know who this belonged to? If there's a -10 I/O rack running loose without a -10 to talk to, I have a -10 that's been missing its I/O rack for many years, since it was destroyed consequent to a flood. I think I should talk to the owner of that I/O rack, and soon!!!!! Thanks Mike (latest aquisition at the corestore: http://www.corestore.org/tc08.htm) http://www.corestore.org

21 years, 6 months

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FW: Made first phone call

by rcini＠optonline.net

You know, this whole dust up has me thinking. I wonder the following: (1) if each one on the list should create and publish for "internal" (i.e., list) use a general collections list. I don't mean a complete inventory, but rather a high-level summary of our collections, so that all of us are aware as to what each of us posesses so in the absence of specific intentions in a will people with specific backgrounds can help disperse the collection. Maybe this database functionality could be added to the classiccmp.org site as part of a "member profile" section. (2) if we should appoint several members of the list to a team of collection evaluators/dispersers. This group could consist of maybe 5-10 people each with backgrounds in specific collections (i.e., a DEC guy, a Commodore guy, etc.) so that they can evaluate and manage the dispersal of a member's collection. The #1 guy would be responsible for making contact, and each of us would at least let our relatives/wives/SOs know who that person is so the call does not seem out of the blue. This whole setup may sound too formal for a group without formal organization, but I think it could minimize any future conflicts or hurt feelings. Rich Rich Cini Collector of classic computers Build Master for the Altair32 Emulation Project Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/ /************************************************************/ -----Original Message----- From: cctalk-bounces(a)classiccmp.org [mailto:cctalk-bounces@classiccmp.org]On Behalf Of Fred Cisin Sent: Sunday, September 26, 2004 9:14 PM To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: Made first phone call When I die, I hope that y'all contact my friends and relatives immediately. The executor of my will would prefer that you bring a big truck, and/or provide dumpsters. If you don't know me well enough to know who to contact, write to deadguy(a)xenosoft.com -- Grumpy Ol' Fred

21 years, 6 months

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archiving as opposed to backing up

by msokolov＠ivan.Harhan.ORG

Geoffrey Thomas <geoffreythomas(a)onetel.com> wrote: > > I think a more apt comparison is the US allowing the museums of Baghdad to > > be looted while they secured the oil fields. > [...] > That was possibly negligent and unthinking rather than deliberate , a case > of tunnel vision. It *WAS* deliberate. It was the actual reason for the whole war. The war was not about oil: Iraq under Saddam was producing a lot more oil than it does now, and They don't need that oil in the first place since they have Zero Point Energy technology in Area 51. The war was about Eden (Iraq's original ancient name), about the Navel of the Earth, and about control over the entire planet and beyond, over the rest of the solar system. They wanted Saddam out because he was trying to bring the Anunnaki back to Earth. He was able to reestablish communication with them by undigging and reactivating the interplanetary communication equipment they left there. The entire war was about stopping the return of the true original gods and goddesses and suppressing the ancient advanced technologies and their technical documentation and historical records, which is what they stole from the Baghdad Museum. MS, exopolitical loyalist and friend of Anunnaki, and by association of Saddam Hussein. Long live Saddam! http://ivan.Harhan.ORG/~msokolov/

21 years, 6 months

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Just what we all need (semi-political)

by david＠dynamicconcepts.us

Check it out.... http://www.ncsoftware.com/images/OutlookForCPM.gif

21 years, 6 months

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Emulex UC08 help

by Pres＠macro-inc.com

I have an Emulex UC08 SCSI <-> QBus board I'm trying to make work. It actually has 2 controllers on the board. I can get into the firmware on both controllers fine -- when no drives are connected. However, when I connect a SCSI drive to a controller, I can not get into the firmware for that controller. It lights up the 3 error LEDS and puts a code "231" <octal> into the SA register low byte. Both controllers do this. I've tried several disk drives and a tape drive. A Zip100 SCSI drive did let me get into the firmware, but I couldn't but System Can't See It. Got the UC08 recently and have not got it working yet. Does anyone know what UC08 error code "231" is? The board firmware is Rev P. The UC08 manual on bitsavers is current through Rev H and stops at octal error code "121". I'm thinking it's a cable problem since the firmware will run when no drive is connected, and won't run when one is. One thing, the UC08 is the S handle flavor that has 2 HD50 male connectors. It's made to go to a cabinet kit that converts the HD50 to 50 pin .1" header. I'm using a known good SCSI HD50M to Centronics 50 pin cable. But I had to get a HD50 F<->F gender bender to hook the cable to the UC08. Any ideas? Oops, not wanting to set Michael off again, Any ideas that might help me solve the UC08 problem? :-) Ed K.

21 years, 6 months

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Pixel Machines

by info＠fragment-media.com

HI I used this machine 1989-1991 in London at a company in London called Electric Image. Its major problem was the bottle kneck in the transferring of data from the Sun, to the machine itself. A ray traced render would indeed be quite fast, but passing any complex data to it, just took forever. Interesting machine tho..Nice images. Simon

21 years, 6 months

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RX02 parts available

by Pres＠macro-inc.com

Got a call from Mark Wagner, a tech at George Washington University in DC. He has 2 RX02 (dual drive rack mount 8" floppy units) available. They are pretty much dead. They are what's left over after getting one unit fully operational. The power supplies are good, and he might keep one. If they could be of any use to you, and you're nearby, drop him a line at: qedqcd(a)gwu.edu Ed K.

21 years, 6 months

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Made first phone call

by msokolov＠ivan.Harhan.ORG

Cameron Kaiser <spectre(a)floodgap.com> wrote: > And a babe and/or stud quotient, too. Not sure about that, here is what I have at this early design stage (the list of properties will definitely grow, these were just the first that popped into my head): StarMatch profile format: First line: M for member, A for applicant, C for new E-mail address for a member pending confirmation. Followed by information lines, then a blank line, then the essay until EOF. Each information line begins with a type letter followed immediately by data. The first letter is A for internal administrative data like the password, everything else is the user's input. All administrative lines must precede the user's lines. The following lines are defined: ACcookie expire Indicates that E-mail confirmation is required. cookie must be supplied in the E-mail, expire is time_t in decimal. AM If present, subscribe to starmatch-ml AOoldemail Only in 'C' files, specifies the old E-mail address. APpassword BMJD x Birthdate as MJD (canonical) BYYYY-MM-DD Gregorian birthdate allowed in input, converted to MJD D (for date) single and looking if present, looking for friends only otherwise. Hurl Home page Iurl Picture URL, may be on our site if we host it Llat[NS]long[EW] Location, lat and long are atof-able floating point latitude and longitude in degrees. Alternatively, in input lat and long may be <num>d<num>'<num>" or <num>d<num>m<num>s, converted to floating point. NReal Name Real name Pproperty=value Any properties one can think of Pproperty (without value) flag properties Scode Sex and orientation, code is M/F for straight, MB/FB for bi, L for Lesbian, G for gay male. Properties currently defined: baue=<n> Been to Bay Area UFO Expo <n> times baue=S Been a speaker at Bay Area UFO Expo cbbw Is a proud CBBW concon=<n> Been to Conspiracy Con <n> times concon=S Been a speaker at Bay Area UFO Expo courage Courageous freedom fighter, not afraid of the shadow govt exop active interest in exopolitics height=<num>cm Canonical, num may be integer or float height=<int>'<int>" allowed in input, converted to cm iufoc=<n> Been to the International UFO Congress <n> times iufoc=S Been a speaker at the International UFO Congress mufon Member of pagan self-explanatory ufo active interest in UFOs weight=<num>kg Canonical, num may be integer or float weight=<num>{lb,lbs,#} allowed in input, converted to kg, num may be int or float wiccan self-explanatory xconf=<n> Been to the X-Conference <n> times xconf=S Been a speaker at the X-Conference

21 years, 6 months

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AW: Usb - Pro/Con

by hans.franke＠siemens.com

>> >>> I don't like the fact that you're supposed to pay for an ID >> >>> (and have thr device 'certified') if you want to make your >> >>> own stuff. Never had this problem with RS232 :-) >> You need to pay for and get certified if you are going to make a legitimate >> network appliance also [MAC ID]. Of course most products purchase a > You didn't need to pay for anything if you wanted to make an RS232 device. Nor do you for USB. Just use one of the existing USB/Paralell or USB/Serial modules, add a serial EEPROM with the needed device strings, and you have your custom USB device. Then take their generic driver, add whatever funcionality your device should support and you get all the bonuses of USB (easy use, plug and Pray, and so on) plus no USB specific development. >> >>> And the fact that you seem to need special drivers for many >> >>> devices which you can bet are not available for any of my machines. >> Although I can not find the link at presend, there is source code for low >> level drivers. Since your environment (by choice) is the use of equipment > Ah, sop now if I buy a product the first thing I have to do is write > special drivers for it..... And hope that I can get enough of a spec on > the product to allow me to do this. ??? Isn't that the same for any device? I mean, if I get me a camera with a RS232 interface (if such thing is still arround, but I can just use my old Olympus as example :) I still have to write my own drivers (unless useung Wn/Mac) ... that's nothing new to USB or whatever. On a closer look, doing a USB driver is even a bit more simple than for any older infervace, since not only the electrical parameters, but also all basic messages are described. >> >>> And the fact that it's very assymmetric (there are 'masters' and >> >>> 'slaves') is something I don't like either. RS232 was much >> >>> more symmetrical. >> RS-232 is an ELECTRICAL Specification. The protocols that are run on >> This are independand. Lets keep it apple and apples..... > OK, Asynchronous bit-serial data, sent LSB first, using the RS232 voltage > and connector specifications :-) *G* and USB is the same, plus a well defined protocoll for messages, which allows software development on specific levels with a great speed. >> >>> More modern palmtops have USB ports. They're slaves, >> >>> designed to hang off a PC. You can't link them directly to >> >>> a printer. It's interesting that some of my older handhelds >> >>> have HPIL ports, but by default the handheld is the loop >> >>> controller ('master'), so you can link them straight to a >> >>> printer. But they can be 'slaves' if you want to link them >> >>> to a larger machine. We've gone backwards (as usual) >> To be honest, I have not looked into the electricals on this. I am NOT sure >> that they are *REQUIRED* to be slaves. > There is, of course, nothing rreally to stop you making a handheld > 'master' (althoguh the master has to supply power to all devices on the > USB chain), but the fact remains that AFAIK all handheld machines > currently on sale are 'slaves' That's where on-the-go comes into the play, an extension of the electrical spec (so the device can see if the other end is a host or a device and select the oposite role) and a protocoll extension, for negotiation if both sides are able to act as host/device. It even allows switching roles while running (of course after closeing all open transactions). OTG makes the low level driver a bit more complicated, but these have only to be made once for any new machine (and adds a little hardware for switching the power on and off). OTG is ment that a camera can be a device to a PC, and a host for a printer ... and so on. >> >>> All my PCs have ISA slots only. Other machines have Unibus, >> >>> Qbus, BBC 1MHz bus/Torch X-bus, various custom I/O slots >> >>> (like on th HP9830), HPIL, PERQlink, etc. Just about all of >> >>> those have RS232 (or compatible) ports, I've nver seen USB >> >>> for any of them >> Again, development boards ARE out their that give you everything you need to >> interface to nearly any host... > Most of the developemnt boards I've looked at assume you're making a > slave device. This is not what I need. Shure, most ICs sold are slave controlers ... If you realy want to look into that, I recomend the Transdimension UHC 124 controler. It handles already the most nasty parts of the low level protocoll, so even the basic drivers are easy to do. also it features an 8 Bit Interface, so it's great for every computer arround. The only feature missing is OTG. It's a host only controller, but has already a 4 port hub integrated (oh, and it's only good for low/full speed, but 1 MB/s is more than most old computers can handle anyway). Transdimension offers a real neat Evaluation board http://www.transdimension.com/products/semiconductors/uhc124/evalboard/inde… But more important is their 'Exerciser' Board http://www.transdimension.com/products/semiconductors/uhc124/exerciserboard… a full figured USB training and Protocoll/Trafic analyzing tool. All you need is a dumb terminal (or a PC) and you can dig deep into USB. My recomendation for anyone who realy wan't so know how USB ticks. better than any Windows based tool I found (if you're able to handle a classic text based UI - not necersarry true for everyone nowadays). The TD243 is a nice upscale controler, but I haven't done anything with it. Also it features a 32 Bit interface :( Theoreticaly the Atmel 370 (*G*) would make an even better controller, since it freatures OTG and an even higer level interface - just, I haven't had a chance to get the needed interface level decription, and I don'T want to use their C libraries. they are worthless for the machines I play with. >> >>> > I also don't understand your statement that it is not a bus..... >> >>> Electrically it's not a bus. If it was, I could just parallel up >> >>> connectors and plug in several devices, there'd be no need >> >>> to _always_ >> >>> have a hub (which, from what I've seen, contains a fair >> >>> amount of logic). >> By that argument (which has valid aspects), then ArcNet was not a bus >> either, and RS-232 is DEFINITELY not a bus architecture (it is purely point >> to point). No argument there. But neither of those claim to be a bus. Well, logicaly I considere USB a bus. from a host perspective all devices are available in paralell, and you talk out of one port. that it'S bade up from point to point connections is not realy a criteria - If you look arround, nowadays Ethernet is also almost always a point to point with switches, still for each connected computer it looks like a bus. Hans

21 years, 6 months

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archiving as opposed to backing up

by msokolov＠ivan.Harhan.ORG

Ed Kelleher <Pres(a)macro-inc.com> wrote: > The Iraqi's will receive a great deal more benefit from the oil than the > museums. Iraqis maybe, but not the humanity. The secret tablets and hi-tech artifacts from Eden looted from that museum were this planet's greatest treasure. > Oh, and who was it that was looting the museums? Special Ops who knew exactly what they were doing, who passed up very beautiful and expensive golden statues and other very valuable artifacts of the mundane kind and went straight for the ancient extraterrestrial stuff in the basement. They also took the extra effort to destroy the museum computers and CDs with catalogs so no one can figure out just what they stole. They also had keys and codes to safes, office locks, etc., so they were pros with inside access. MS

21 years, 6 months

2
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Made first phone call

by msokolov＠ivan.Harhan.ORG

Gene Buckle <geneb(a)deltasoft.com> wrote: > Let me guess, you're not exactly popular with the ladies, are you? Only the ones who go to Bay Area UFO Expo and Conspiracy Con. Those conferences draw a very good gender balance, but more work is needed on making us ufologists match. I'm planning to create a new and exciting matchmaking site (hosted at Harhan and powered by 4.3BSD-Quasijarus on a VAX of course) specifically catered to this community. Instead of stupid useless questions like height, eye color, etc. the member profile form will ask questions about UFOs, conspiracies, psychic powers, alternative medicine, etc. MS

21 years, 6 months

2
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simh simulation speed (fwd)

by vcf＠siconic.com

Forwarded from Bob Supnik... ---------- Forwarded message ---------- Date: Mon, 27 Sep 2004 21:38:48 +0000 From: bsupnik(a)comcast.net To: Vintage Computer Festival <vcf(a)siconic.com> Subject: Re: simh simulation speed Unless the simulator writer inserts timing (delay) code, as Phil did for the PDP11, SIMH runs as fast as possible. In the case of the LGP30, this is many, many times faster than the real machine. /Bob > On Mon, 27 Sep 2004, Tom Jennings wrote: > > > I haven't had a chance to get back and debug, but is it true that simh > > does NOT simulate the target machine's execution speed? I wrote a simple > > 'sum all words in track N' program for the LGP and it completed as soon > > as I hit return! It should have taken many seconds... I did RTFM, so no > > reference to it, but I haven't had time to go look at the source. Got > > lazy and decided to post instead of research (typical, huh :-) > > I wondered that myself. SpaceWar! on the PDP-1 seems to run at its > original speed. > > -- > > 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 ] >

21 years, 6 months

1
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Made first phone call

by jos_dewaal＠hotmail.com

On 26/09/2004 Stephane Tsacas wrote: >Jos, I think you missed the following email. >Stephane I think you're missing the point. I was merely pointing out that contacting a family in mourning about such unimportant matters is, in my opinion, pretty tasteless and could cause unwanted effects. Greetings, Jos _________________________________________________________________ Easily share your photos and music - get MSN Hotmail Plus! http://join.msn.com/?pgmarket=en-xe

21 years, 6 months

7
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AW: I have a Synertek VIM-1

by hans.franke＠siemens.com

> I noticed all of you had nostalgic interest in the Synertek VIM-1. I have one, in its old > yellowed box, postmarked July, 1978. While I had grandiose intentions when I > originally got it, I never put it to use. If any of you have an interest in it, let me know. Well, there's definite interest here, but without a return Address, it's hard to answer :) Servus Hans

21 years, 6 months

1
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Relay computers - OR functionality

by melamy＠earthlink.net

you create your OR functionality with diodes - use two diodes (or as many inputs as you need) such as the 1N4001 for your inputs. Tie the cathodes together and attach that to the relay coil. Apply "logic high" (whatever voltage your relays operate at) to either (or any) diode anode and the relay will turn on. The relay can be the next stage and does not have to be there to implement the OR. best regards, Steve Thatcher Question: Wouldn't it be easier to implement an OR gate with no relays at all (just two wires joining together)? Or would you need to use the relays to keep the output voltage/amperage regulated? Cheers, Ade.

21 years, 6 months

1
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Book available -- "The Computer Technician's Handbook" -- Computer Automation PDC 808

by wmaddox＠pacbell.net

I have a duplicate copy of "The Computer Technician's Handbook", by Brice Ward, TAB No. 554, 1971. The first half of the book is a convetional treatment of basic digital logic theory, logic families, and such, with an emphasis on the 8200 series. The second half of the book is more interesting. It is a "case study" of the Computer Automation PDC 808, complete with a description of the architecture, logic diagrams, a detailed walkthrough, timing diagrams, scope waveforms, etc. Much of it looks like it was probably lifted from the manufacturer's service manuals. The PDC 808 was an 8-bit minicomputer (yes, 8-bit) introduced in 1968. It appears to have a family resemblance to the 16-bit PDC 816, and more closely resembles the traditional 16-bit "stretched PDP-8" minicomputer style rather than most of the later 8-bit architectures seen in microprocessors. The bookseller rated this book in "very good" condition. It is clean with a tight binding, with some wear on the cover and a small crease. I paid $7.00 for it. I'll sell it for that plus shipping. --Bill

21 years, 6 months

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Northgate Laptop Question

by opinion102＠hotmail.com

Hey, I ran accross one of your newsgroup posts on the internet the other day. I bought a northgate ZX off Ebay, and have found it difficult to find the A/C Adapter, can you give me any advice to locate one for sale, or perhaps where to buy the connector, so far, It seems nobody has anything compatible which would power the computer. Now I guess I know why the guy selling it was so eager to get rid of it, lol.... Thanks for your help, Michael _________________________________________________________________ Don’t just search. Find. Check out the new MSN Search! http://search.msn.click-url.com/go/onm00200636ave/direct/01/

21 years, 6 months

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Made first phone call

by marvin＠rain.org

I think Sellam absolutely did the right thing!!! A number of people here in Santa Barbara have passed away with significant classic computer related items. For one example, many of the IBM 1130 and Burroughs manuals that Al has scanned came from someone who had worked with these things for close to 40 years. *ALL* of those manuals were destined for the recycle bin. The only reason they got saved was a friend of mine called me after he saw them when he was picking up other equipment there. I called his wife and was invited to come over and take what I wanted (I took everything!) When I saw her again a couple of months ago, his wife was very happy to hear that they have proved useful to others. A friend of mine passed away many years ago, and I was called to see if I would help with the stuff. He had been involved with microcomputers >from the first, and his father knew nothing of the value of this stuff. Of course, at that point in time, a lot of classic stuff was still deemed junk and went to that great storage space in the sky. Out of that came an almost complete set of (can't remember the name right now) cassette programs for the TRS-80 that were mailed out on a subscription basis along with many of the docs and associated correspondence (he was also an editor for a bit.) There were also boxes of documentation for other now classic computers. There are many such stories by myself and others on this list. I don't know where you and your wife are coming from, but the main focus of most of us on this list is saving classic computer related hardware, software, docs, etc. And many of us have irreplaceable items as most likely Don did. Again, Sellam did the right thing, and I am reasonably sure it was also what Don would have wanted. > On 19/09/2004 Sellam Ismail wrote: > >I made an initial phone call to Don's number and got an answering machine > >(presumably Don's voice is still on the OGM). I chose not to leave a > >message. I'll try again later today. > > Sellam, I'm shocked by your lack of tact and respect. No matter how > important Don's collection might be in your eyes, you shouldn't lose > sight of the fact that his wife and family have just lost him. They > probably couldn't care less about what happens to his stuff in the > garage at this point. > > I've asked my wife for her opinion on this and she said that she > would instantly scrap and toss my stuff if she ever found herself in > a similar situation. I can't blame her. > > What do others think of this ? > > Greetings, Jos

21 years, 6 months

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5.25 fdd drive

by mattd1205＠sbcglobal.net

hello i have the teac floppy drive and it has does not need any driver. email me if u need any more info matt

21 years, 6 months

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78MGT2 and 79MGT2

by rvtechno＠vsnl.net

Hi there I saw your posting. I think I know where I can pick up these Regulators. Do you have the datasheets / pinouts so that I can test them? Venkat VU2KV

21 years, 6 months

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test-drb