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

by jwest＠classiccmp.org

The Burlington VCF trip was my first VCF. I enjoyed myself immensely. Three cheers for Sellam for putting in the work to organize the thing. I did talk to Sellam a bit about possibly having a VCF central in St. Louis - I want to bring my cherished HP2000/Access system. I refuse to cart that system across the country to either coast, or even to KC :) Sellam, I'll be in touch to discuss some stuff about seeing if we can have a VCF in St. Louis sometime. The hotel (mariott) was wonderful, and it was so great to put a face with the email address on so many of the people I've been talking to here over the years. I will definitely make it to a few more VCF's, but hopefully with less travel problems. Ah yes, so many have asked about "The Great Trailer Incident(tm)". Here's a synopsis of my trip to VCF and what all went wrong - presented here entirely for your amusement and as a lesson so that others (including myself) may avoid my screwball missteps. I left St. Louis on Wednesday the 14th, about 8am. Drove non-stop to Washington PA, about 600 miles and spent the night in the Red Roof. My van was loaded with two HP racks, and in tow was a 5x8 flatbed trailer with two more racks and a few 7906 disc drives. The van and trailer were handling wonderfully. I checked the tires on the van before leaving Saint Louis, but neglected to do that on the trailer. The trailer I had just gotten about 6 or 7 months ago for $500 (because it included a PDP-11/45 on it at no cost). It had driven back to St. Louis from TN just fine then. So anyways... I left Washington PA thursday morning to drive the remaining 600 miles to burlington. I was about an hour or so from burlington, headed east on I-84, just 4 miles from the massachusetts border when the tire blew and disintegrated. I got out an looked and there was a few shreds of rubber on the wheel, the majority of my tire being about 30 feet behind the trailer. Pulled off the highway and pondered if a normal car jack would lift a trailer that was pretty heavily loaded, or how I was going to possibly get to the spare van tire with the van fully loaded, and if that tire might fit the trailer, etc. etc. My adventure had begun. I called AAA and said "I'm not a member, but I'd like to be". They laughed and said they wouldn't sign me up for membership AND place a help call at the same time. How helpful. But they at least said they'd get me the phone number for a service station in my area. I had virtually no cellphone battery left. After getting transferred around to quite a few different service stations, one finally had a human voice instead of an "I'm sorry, we're closed" recording. Cool. Told them I needed someone to come out with a certain tire, and where I was located. They said that because of the location/highway I was on, I HAD to have police come out before they could get out there. Huh? I told the guy I had no cellphone left, and would he please call the police for me. He said sure. Almost two hours later, still no police. What fun. It was around 11pm by then and I was getting pretty testy. So I called information, got the police phone number. They said they weren't located in the area I was in, and would transfer my call to another police station. Click... dead line. This happened about 3 or 4 times. Apparently police stations can't transfer calls without hanging up on people. So next call I got the original police station to give me the phone number for the right police station. Wrote it down and asked him to transfer me... click... hung up on again. So I dialed the other police station directly. Fast busy. Waited a while, fast busy again. This cycle repeats a few times. Finally called the original police station, he transferred me and joy of joys this time it went through. The police officer at the new station politely got all my information, location, etc... then told me that I was talking to the Danbury police, which were on the entire opposite side of the state of connecticut from where I was. They offered to transfer me (ARGH!) to Troop A, who were in my area. The kind people at Troop A said they didn't handle the area I was in, and transfered me to some other Troop (F-Troop I suspect). When the transfer went through, I received a recording "I'm sorry, but our offices are closed. Our normal business hours are..." ARGH!!! So I called the original police station, again told the guy where I was, that I had no battery left, and needed him to get someone out there, then hung up. About an hour later, an officer pulled up behind me and asked what the problem was. I suspect it was too DARK for him to see the SHREDDED TIRE at his feet. I told him I wanted someplace to come out with a tire and replace mine, or tow to a 24 hour service station, etc. He then politely asked why I called the police, that I should have called a towing service. ARGH! That IS how I started out, and the towing service told me to call the police first. What fun. The officer informed me I had two choices. Leave the trailer, and come back in the morning and get it with a new tire, or call for towing. I wasn't going to pay towing to burlington, over an hour away. I couldn't get a close hotel, because I had prepayed with late checkin for the mariott at burlington. I didn't want to leave the trailer on the side of the road. But not because of what the officer said... he asked what was on it (no, I didn't jokingly say 'cocaine'). When I told him "antique computer gear" his eyes got wide and he cautioned me about theives going up and down the highway picking stuff off vehicles/trailers left behind. Of course I told him that I wasn't concerned about general theives... I was concerned about my fellow collectors who may also be driving into burlington along I-84 that night, THEY would certainly stop and pick the trailer clean *GRIN* (just kidding). I decided to leave the trailer, chain it with padlock to the guard rail on the side of the highway, and drive the rest of the way into burlington and deal with it tomorrow. I finally got to the mariott at about 1am or so and the bed never felt so good. The next morning I got up, and drove the van to VCF so I could empty it out and not haul that weight back to the trailer. As I was pushing gear in the front door, I met Sellam and asked him if he could make sure the stuff made it in the rest of the way, that I had a flat tire on 84, and had to go retrieve it - so I'd be late to the show but would be there. Then I went to sears just up the street from the service center, bought a tire, and headed out an hour away on 84 in search of my trailer. Found the trailer, jacked it up, grabbed the rim, and spent about 1/2 hour looking for a service station that would put the new tire on the rim for me. Pulled in to something in studbury? and the mechanic said no problem, fired up his tire machine, and... *POOF*. Showers of sparks everywhere. His machine was not going to be putting tires on rims anytime soon. So, he directed me to another garage a few miles away. They got the tire on the rim just fine. As the mechanic put the tire in the van, I asked "how much do I owe ya?" fully expecting the guy would do it as a freebie, or maybe 5 bucks. No... he wanted 20 bucks - cash only. At this point, money was no object, I was 100 miles away, missing a computer show I drove 1200 miles (one way) to go to. GRRR. Drove back to the trailer, put the tire on and thankfully pulled away. Of course, when I put the tire on I got the bright idea that perhaps I should check the other tire on the trailer too. It was in really bad shape, probably would have gone anytime soon. So I limped back to burlington, van in tow, never exceeding 40 mph cause I didn't want the other tire to blow. A few fellow highway drivers weren't particularly happy with me driving at that speed, and made that point quite clear with various hand gestures wild gesticulations. So when I got to VCF I unloaded the trailer, then dropped the trailer off at sears so they could replace the other tire. Went to VCF and had a total blast!! When I got into VCF, apparently the story of "The Trailer Incident(tm)" had spread like wildfire and grown substantially. I think I overheard one incarnation that involved my trailer being on fire and me being put in jail. Hehee... amazing how a story grows through retelling. Then much of the VCF folks went to Victoria's Station for dinner - where the portions were huge and quite good! I had to leave during dinner to pick up the trailer (Sears closed at 8), but then came back for some good conversation and story swapping with my fellow classiccmp'ers. After dinner I met in the lower parking lot of the marriott with Dan Cohoe, William Donzelli, and Evan Koblentz. Was rather funny to see three vans pull up into an empty parking lot, starting moving a bunch of "big boxes" between them, then all go speeding off. Hummm. I got alot of really great DEC and DG stuff. You would THINK this would be the end of the story. NOT! I had taken four empty HP racks to the show... and confirmed with all four collectors before I left st. louis. Of course, at the show, one of the collectors didn't show up at the show at all, and the other one apparently left before I got there late friday (due to the above). So, I was stuck with two large HP racks, sitting in Sun's building. I couldn't load them back to my van, which was already full (and scheduled to get more at bobs and bills). So I was scurrying around asking Sellam for any ideas for disposal, etc. Finally Dan Cohoe stepped forward to help me out and took both racks. One is still destined to go to the person who wanted it as they aren't too far from Dan C. The other... well... haven't heard from that collector yet :) Dan Cohoe - THANK YOU! I had to leave VCF a little early, because I had gear to pick up from Bob Shannon in Leominster, then more gear to pick up from Bill Dawson in Washington PA on the way back. Stopped at Bobs and loaded up, then headed for Washington PA. After about 120 miles, I noticed I itched. I was getting bug bites. I looked across the dash of the van, and there were flying ants (or something like that) crawling over the entire dash, the seats, my legs, etc. Apparently some of the gear I picked up at VCF or later had a low rent housing project for these bugs going on inside of it. Opening all the windows while going down the highway, and then (later) closing the van up tight at night, seemed to get rid of them. It was pouring down BUCKETS of rain, and I had to pull off the highway several times as visibility approached 10 feet. When I got to Washington we loaded the Reality into the trailer, and inbetween breaks in the rain got it all tied down and ready to roll. As I was laying on the ground underneath the trailer hooking bungee cords up, Bill mentioned to me as an aside "Um, you do realize you're laying in a bed of poisin ivy don't you?". I now have the rashes to prove I did NOT have any idea. I got perhaps 2 miles from Bills house before the trailer started fishtailing wildly. Cool! More fun! So I pulled over again but this time couldn't see anything at all amiss. So, I called Bill, and trouper that he was... he drove up to help. After scratching his head a bit, he stood on the tongue of the trailer and found the problem. A seriously negative amount of tongue weight. We were pretty sure we had distributed the weight well (especially with the 11/34 up front), but, apparently not as the power supply for the reality is built into the bottom of the rack, and it is VERY heavy. So, I turned on the emergency flashers and followed Bill to a nearby closed gas station that had a large covered area. We spent the next hour and a half taking everything off the trailer, re-organizing how it would go back on, retarping, tie-down, and re-bungee'ing everything. Finally I was ready to continue home. The thing drove great on the highway now and I settled in for a long, relaxing drive back towards home - st. louis. There was really heavy fog around PA, and just as I was settling down into "watching the miles tick by" mode..... Suddenly I see a large piece of scrap metal on the road in front of me. It came out of the fog, was no way to avoid it. I patiently braced for the dragging of metal, and my patience was rewarded with a wonderful shower of red sparks going up both sides of the van, from the piece of metal being drug under the van. Cool! All this fun, and a fireworks show for free to boot! The metal looked like a piece of aluminum siding all crunched up, or maybe part of a corrugated tin roof... something like that. I continued to drive for about 500 feet, because the metal piece looked pretty small/flexible and I figured it would work it's way out from under the van in just a few feet. It didn't. So I pulled over on the shoulder and sat there for a minute, contemplating what egregious sin I had comitted in a different life that merited this amount of trouble. I was trying to figure out just how (un)safe it was going to be, crawling under a van in the dark, on a fast highway, trying to unwedge a piece of metal debris from under the van. To my suprise, when I got under the van, there was no metal, and no damage, in sight. Apparently the metal HAD come out just when I pulled over to the shoulder of the road. The rest of the trip home to St. Louis was, in fact, totally uneventful :) Again, it was really great to meet the folks there at the show. Everyone was most friendly, helpful, and it was just a plain blast to put a face with the name, and just sit and chat with people about this hobby. Hopefully, people won't hold my grumpy attitude the first day at the show against me, now that they see just what my thursday night/friday morning was like! Well, I'm off to sort through old email, the business cards I collected at the show... and try to somehow get back to restoring some more of the machines in my collection. VCF St. Louis anyone? Oh - by the way - if I had to do it all over again, with the same problems as above, I would. VCF was THAT fun. However, next time I will be taking along a spare tire for the trailer :> Regards, Jay West --- [This E-mail scanned for viruses by Declude Virus]

21 years, 8 months

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Digital Control Handbook, First Edition

by marvin＠rain.org

In going through a bunch of books I recently received, I found the 1967 first edition of the Digital Control Handbook. I almost missed it since the format was different from the later versions that I am used to seeing.

21 years, 8 months

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Sparc Book 2 / 386 laptop give away

by tbilby＠rave.com

Hello, I am putting a Tadpole Sparc Book 2 "curbside" for pickup Thurs. morning unless anyone on the list would like to pick it up. Utica, MI - It was functional 6 mos. ago but now only the HD light flashes when the power switch is pressed. - The power supply is outputting the correct 18VDC. - I could not locate the component that was causing the crowbar. - It has only been minimally disassembled. - I am also setting aside a "Zeos notebook 386" (16Mhz 386sx, 5MB RAM, 20MB HD). - It ran OS/2 2.1 perfectly back in 1993 and currently has SCO Unix 3.2.4 loaded. There are no PCMCIA slots in this notebook.

21 years, 8 months

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B800 vs B1800, etc

by stevew＠ka6s.com

Well - to answer a series of questions ;-) There were two separate operating systems available for the B1000 series. There was the standard MCP (that was similar in operational characteristics between the B1000 and B2000 series at least) It didn't have a common code base, but things worked in a similar manner from the console (SPO in Burroughs speak.) The other OS was "CMS" and ran on the B800/B1000 series. CMS was from the Liege plant if I recall (Hans - is this right??) and I remember them showing up in Santa Barbara where we were bringing up the B1965 at the time. We had our MCP up with a couple of issues when the guys came in >from Liege to bring up CMS. It had one issue which was a new instruction we'd added on the B1965 if I remember, other than that it came right up! So from my understanding you could run the same applications on the B1000 and B800 series. Now - difference between B18XX and B19XX. Mostly cost reduction and reimplementation in TTL. The B19XX may have been faster (a blistering 6Mhz ;-), likely had a larger memory sub-system, and I think they had the same size instruction cache. The B19XX machines had a 4Kbyte instruction cache. The difference between B1955 & B1965. Well you've all seen how BIG the B1955 was. The B1965 with soft console (which I LOVED working on...) is about the size of a group of desk drawers on a standard desk! Maybe 2.5 feet tall, 20 inches wide, and 24 inches deep. (Real guess on that -but it was a VERY small box.) It was every bit as capable as the B19XX chassis. The Disc Controller was reimplemented as 5 cards using an 8086. There were two data com options, the single line and Multi-line controller. The Multi-line controller was the only "DMA" device in the system and was also a 8086 based design. The soft console was an 8080 implementation. All this stuff had to be field testable/repairable so the soft console designer (Dick Mogia) went to considerable effort in having two paths to do everything. If the UART was dead, he had some 8255 parallel port bits that he could bang out the serial code needed by the console to show the problem through independent transistor drivers if the RS422 drivers were dead! It also controlled the the tape drive used by the system to IPL - the UART did double duty here. With the addition of the UART and a uP driving it, we found out just how bad the tape drives REALLY were. Up until then it was done with a state machine! There were really BAD parity error and tape errors that occured. The tape didn't last long! We had the same kind of issues as the B80's floppy! This was all revealed when we had something on there that could categorize the types of errors we were seeing! I had ALOT of fun working on the machine, and learned alot too! Steve Wilson

21 years, 8 months

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What is the foulest thing you have ever made a digitalker chip set say?!

by esharpe＠uswest.net

What is the foulest thing you have ever made a digitalker chip set say?! Thanks Ed Sharpe archivist for SMECC Please check our web site at http://www.smecc.org to see other engineering fields, communications and computation stuff we buy, and by all means when in Arizona drop in and see us. address: coury house / smecc 5802 w palmaire ave glendale az 85301

21 years, 8 months

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Available: IBM 029 keypunch

by donm＠cts.com

Spotted this on a newsgroup if anyone is interested. - don ---------- Forwarded message ---------- Path: chiapp18.algx.net!chiapp17.algx.com!chiapp19.algx.com!allegiance!news.maxwell.syr.edu!newsfeed.stanford.edu!sn-xit-02!sn-xit-01!sn-post-01!supernews.com!corp.supernews.com!not-for-mail From: Louis Krupp <lkrupp(a)pssw.NOSPAM.com.INVALID> Newsgroups: alt.folklore.computers Subject: Available: IBM 029 keypunch Date: Sat, 24 Jul 2004 17:19:45 -0600 Organization: Posted via Supernews, http://www.supernews.com Message-ID: <10g5rhsbv9rt0e2(a)corp.supernews.com> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax) X-Accept-Language: en-us, he MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: abuse(a)supernews.com Lines: 13 Xref: chiapp17.algx.com alt.folklore.computers:91028 Anybody looking for an IBM 029 keypunch? In the (presumably unlikely) event that anyone wants to come to Boulder, Colorado and get it, please let me know. (Soon, because it's going to be recycled.) It's been rained on, but it seems to be otherwise intact. I can find a home for the drum in the more likely event that no one wants the rest of the keypunch. Louis Krupp lkrupp * at * pssw * dot * com -- end of forwarded message --

21 years, 8 months

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CAPcard 9500 available

by SUPRDAVE＠aol.com

Ive got two of these things. It's basically a complete socket 3 system board on a full length ISA board and runs independently from the host computer. They both have Pentium overdrives on them. How about $4 plus whatever it costs to ship. -- I am not willing to give up my liberties for the appearance of 'security'

21 years, 8 months

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Applix 1616

by kenziem＠sympatico.ca

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Andrew Morton was the keynote speaker this year at the Ottawa Linux Symposium. During his introduction is was mentioned that he developed the Applix 1616 back in '85. Does anyone have pictures of one of these? - -- Collector of vintage computers http://www.ncf.ca/~ba600 Open Source Weekend http://www.osw.ca -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQFBAwzKLPrIaE/xBZARAi4HAKC6kp9V/C3i+BIHCVbWSRXKOMwgZgCeI1iz 1qBOUjLYYuLwlhySvMB9WwA= =xs1q -----END PGP SIGNATURE-----

21 years, 8 months

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DECmate III with a serial console?

by dbetz＠xlisper.mv.com

Well, I had four DECmate III computers when I went to VCF East and now I'm left with only two. Unfortunately, I don't have keyboards or monitors for either and that makes them unusable. Rather than trying to acquire a keyboard and monitor I'm wondering if anyone has tried to replace the boot ROMs to allow either OS/8 or OS/278 to boot using a serial terminal connected to the serial port. Is that even possible? It would be nice to be able to use these machines without a monitor or keyboard. Thanks, David Betz

21 years, 8 months

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Cybex Data Reduction Computer??

by dwight.elvey＠amd.com

>From: "Joe R." <rigdonj(a)cfl.rr.com> > > I went out today found a Cybex Data Reduction Computer. Is anyone familar >with them? It has a tan plastic shell with a QWERTY keyboard and a single >line LED display with a printer on the LH top side. I opened it up and >found that it has an AIM-65 computer board in it. Haven't done anything >with it other than that. > > Joe > Hi Joe A number of people slapped lables on AIM-65's. I have a box similar to this with a few extra boards added that is AIM-65 based as well. What other than the shell is non-AIM-65 ?? Dwight

21 years, 8 months

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2.10bsd on an 18 bit '11?

by brad＠heeltoe.com

Does anyone have any experience running 2.10bsd on a 18 bit pdp 11, like an 11/34? I googled and could not find anything. -brad

21 years, 8 months

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Register your exhibit for VCF 7.0!

by vcf＠siconic.com

It's time to register as an exhibitor for VCF 7.0! The dates have been changed from October 30-31 to October 2-3. I wanted to have a Halloween VCF, but it wouldn't work out for too many people, so that idea unfortunately had to be scrapped (though you're still welcome to come dressed up if you'd like). This is less than 3 months away, so get your exhibit figured out and register ASAP! http://www.vintage.org/2004/main/exhibit.php The exhibit categories are going to be re-vamped this year, and all registered exhibitors will receive an update once the new rules and regulations are posted (in another 2 weeks or so). In the meantime, select an appropriate class from the existing ones. Please e-mail me directly if you have any questions. I hope to see at least 50 exhibitors at VCF 7.0 so please sign up!! -- 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, 8 months

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CADAC Motherboard

by marvin＠rain.org

Is anyone familiar with the CADAC Motherboard? I couldn't find any information using Google. It looks like it might be an Apple clone with one slot for the ROM board, and 7 slots for other cards. There is an RCA video output as well as two 1/8" jacks labeled "IN" and "OUT". It has both a Z-80 and a 6502 microprocessor.

21 years, 8 months

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Amigas strike back!

by huw.davies＠kerberos.davies.net.au

I was watching the test match from the UK on my local cable provider (Optus) earlier this evening when suddenly the screen went black (loss of sync) to be replaced with an Amiga desktop (in black and white). Looked like a much later release than the version I ran about 15 years ago but still recognizable. I wonder if this was a local Amiga or perhaps (more likely) a desktop in the UK. Huw Davies | e-mail: Huw.Davies(a)kerberos.davies.net.au Melbourne | "If soccer was meant to be played in the Australia | air, the sky would be painted green"

21 years, 8 months

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Anybody here work on HP 7905/7920 disk drives?

by dwight.elvey＠amd.com

Hi I will be interested as soon as I get a 7905 :) Dwight >From: "Jay West" <jwest(a)classiccmp.org> > >I'd be quite interested in these, as I'm sure some other people would be >too. Any chance we could get pictures? > >Jay >----- Original Message ----- >From: "Joe R." <rigdonj(a)cfl.rr.com> >To: <cctalk(a)classiccmp.org> >Cc: <dancohoe(a)oxford.net> >Sent: Thursday, July 22, 2004 10:39 AM >Subject: Anybody here work on HP 7905/7920 disk drives? > > >> Went scrounging yesterday and found a small plastic box of what looks >> like HP disk drive test/alignment accessories. Parts include 07905-60049, >> 07905-60039, 5061-1386, 07920-60030 and 07920-62421. Anybody need this >> stuff? The box is filled with that old self-disintegrating foam so the >> stuff will need to be cleaned up but it looks like it's in very good >> condition (the box is in rough shape). >> >> Joe >> > >

21 years, 8 months

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B700 vs B1700

by aek＠spies.com

Indeed, I worked on the development of the B80 and the 8 in floppy was the system disk for some configurations. It held 1 M byte -- Was there any common code developed between the 700 and 1700 series? One of the things I had wondered about was on the front panel of the 1700 the '1' in 1700 was smaller than the rest of the digits, like it was somehow related to the 700, which seems strange since they aren't at all alike archetecturally. I'll have some more info on the 700 series going up soon. May be of use if they ever try to get the B800 running again (though I'm not sure if they got any software with it)

21 years, 8 months

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VCF East 2.0 report...

by wh.sudbrink＠verizon.net

Take two days off work and it takes a week to recover... Anyway, here is a brief summary of my experience of VCF East 2.0. For those that want to look at some pictures (quality not guaranteed, my camera sucks) with no captions or anything: http://wsudbrink.dyndns.org:8080/vcfe2004/ Thursday, 7/15 Left Washington, DC at 6:20am. The drive was uneventful but long. Ten hours including gas and lunch stops. Couldn't find any other VCF'rs right away, so I settled into my room, posted to classiccmp and surfed a bit. The in room high speed internet at the hotel was nice, easy to set up and well firewalled. Later, went back out to my car for a couple of things and saw Hans Franke in the lobby. He had some stuff to do, so we agreed to meet in the hotel bar later. I drove over to recon the Sun site. Getting there was as easy as it looked on the map and the visitor parking was right next to the main entrance which included a ramp. Met Hans at the bar and after a little while, Lawrence Wilkinson joined us. Learned that Sellam was on his way from Japan and would be arriving the following morning. Suggested new classiccmp motto: "Collect vintage computers and see the world!" Had a beer (Thanks Hans!) some pleasant conversation and called it a night. Friday Arrived at Sun around 8am. I wasn't the first one there. Curt Vendel and Evan Koblentz were already there and several others arrived soon after. There was some waiting around while the Sun employees figured out what needed to be done, then we were registered with Sun security and started setting up. The area for the exhibits was a nice atrium adjacent to the employee cafeteria. I started setting up my machines, fully expecting the OSI to be a pain, due to the less than reliable "fatherboard" bus system it uses. It surprised me however, coming right up on the first try. I should have suspected something right then! I finished getting set up and started wandering around taking pictures, waiting for the speakers to start. After about an hour, I noticed that the display on the OSI had gone blank. "Ha! Got me after all, didn't you, you silly box?" So I broke out the toolbox, expecting to have to reseat the cards. A little thought went through the back of my mind that usually, when its bus is compromised, it displays garbage and I didn't remember it ever going blank before. A few people noticed me getting out my tools and wandered over to watch. As I picked it up to turn it over (you have to put the integrated keyboard style OSI boxes on their backs to work on them... great engineering) an embarrassing rattling was heard by all, eliciting a chorus of "Hey, you've got something loose in there!". Now I knew that there was nothing loose in that box when I brought it in >from the car and there are no moving parts in it other than the fan, which had been humming along just fine when I powered it down, so what gives? I proceeded to open the case and there were two button style diodes loose in there. A quick look around showed that they came from the power supply and seem to have simply dropped off their leads. They must have heated up to the point that they melted the solder and fell. Well, nothing to do for it but put them back. Another testimony to OSI design is that you have to pretty much completely disassemble the box to get the PS out. Part of the PS frame supports the fatherboard. Repairs killed the whole speaker time and extended into the actual exhibit time, but I was able to give my spiel and make conversation with the people looking at my exhibit. Got it all up and working again and those diodes heated right up. I reached in with a toothpick and the solder was clearly molten so I powered it down and declared the OSI a non-functional exhibit, sigh. The rest of the exhibit time went well, with my Sol and Northstar both running like champs. The Sol running _Space_Raiders_ and the Northstar running _Zork_. We closed up for the day and a large group went to Victoria Station restaurant for dinner. It is a neat looking restaurant, with real train cars incorporated into the building. The food was good and I sat next to Art Hill and his wife and got a little bit of a preview of his Saturday talk. Saturday I attended all of the speaker sessions on Saturday. They were all great! Art Hill has had a remarkable career with computers, starting back in the tube days. He shared some of the experiences he has had along the way. Lawrence Wilkinson told us about bringing an IBM 360 back to life along with all of the logistics involved (like, where are you going to put it?). Evan Koblentz shared the results of his research into the history of PDAs, which goes back a good bit further than you might think. Finally, Jon Titus told us about the Mark-8, both in technical terms and about the process of getting it (the article) published. The exhibits were pretty well attended on Saturday. Several Sun employees came back and brought children with them which was fun. Showing them _Zork_ in particular... "Wow, you can have a game without pictures?" Things finished up. Oh yea, I won first place in "Manufactured personal computer - Pre 1981" and third place "Best of Show". Got everything packed up and went with Hans, Lawrence, Evan, Bob Maxwell and William Donzelli to Chili's for dinner. Hans would have preferred to go back to Victoria Station (with its large portions) but he made do by ordering two entrees! We got a call from Sellam and, after dinner, Hans and I went back to Sun and rescued a VCF sign that had been forgotten out by the entrance. Sunday Before the trip home, I went over to MIT for the swapfest. I got there at 7am, thinking that I would just pay the sellers fee to get in for a while before I hit the road. I discovered that, while it's not mentioned on their flyer, they do have a $15 "early bird" admission that gets you in at 7:15. No $1 discount on the early bird admission however. The $15 was worth it as I made a great find, a blue, 9 inch Ball monitor, manufactured in 1979, in great shape. For $10, an almost perfect match for my Sol, down to the PL59 cable that came with it! I found Hans at the swapfest and gave him the VCF sign (that had been left in my car the night before) and hit the road for home at about 9:15am. Thanks to everyone whose efforts went into this event! I had a really great time and will make every effort to attend next year. Bill Sudbrink

21 years, 8 months

1
0
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Jay: 11/45 books

by trash3＠splab.cas.neu.edu

Jay, I found a 1972 pdp11/45 processor handbook and a 1976-77 pdp1104/34/45/55 processor handbook. I have also found a couple of pdp11 peripherals handbooks, but none of them go into any real detail on the differences in memory and what is useable in which system. If you want, I can mail you the handbooks. Joe Heck

21 years, 8 months

1
0
0 0

Cybex Data Reduction Computer??

by rigdonj＠cfl.rr.com

I went out today found a Cybex Data Reduction Computer. Is anyone familar with them? It has a tan plastic shell with a QWERTY keyboard and a single line LED display with a printer on the LH top side. I opened it up and found that it has an AIM-65 computer board in it. Haven't done anything with it other than that. Joe

21 years, 8 months

2
2
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Burroughs B1955

by aek＠spies.com

FWIW I worked on the early B17xx series (field engineer). That was in 1977-1978. I don't think I ever saw a 1900 series. -- The 1800's would have just been hitting the field then. 1900's did't make it out until the early 80's Some nice pics of the 17xx up now under http://www.bitsavers.org/pdf/burroughs/B1700/B1700_brochures/ esp http://www.bitsavers.org/pdf/burroughs/B1700/B1700_brochures/1066149_1700/1…

21 years, 8 months

3
2
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B1955

by stevew＠ka6s.com

Well - my wife says I can't bid on it :-( I helped bring the machine into manufacturing! (Hi Hans...) It was the first TTL machine Burroughs made, and is built out of basic 74S series stuff and proms. I joined the company as they were bringing up the etch card version of this machine. My first job was to get all the etch cards debugged. If anyone buys the beast here in San Jose - I would love to help get it working. Al has my notebook on the follow-up machine, the B1965 that was the basis for the Field service manual for the B1965. Some of the cards are common! P.S. Al - is the Computer History Museum ever going to be interested in resurecting the B1955 they have?? Steve Wilson

21 years, 8 months

1
0
0 0

Pagemaker for the MACs (68k)

by rmeenaks＠olf.com

Hi, Does anyone have a copy of Pagemaker for the MAC (68k not PPC) which I can, ahem, borrow? I want to convert some documents that I have over to PS/PDF but I only have the PC version of Pagemaker and the documents were created on the MAC. They are only cross-platform compatible across the same version of Pagemaker :-( I believe the documents were either created in Pagemaker 3.0 or 4.0... Thanks, Ram

21 years, 8 months

1
0
0 0

Burroughs B1955

by aek＠spies.com

PLEASE! save this from the scrapper! The Computer History Mueseum has one of these and one of the stops I made last month was to one of the last field service guys who maintained those systems and picked up all of the documentation, field diags, and a complete set of cards that he still had left. I'm hoping Mike (corestore) will be interested but it is a BIG system, as you can tell from the pics. --- There is a B1955 mainframe system on Ebay right now, with just about a day left: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=5109222569

21 years, 8 months

6
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Cybex Data Reduction Computer??

by pete＠dunnington.u-net.com

On Jul 24, 0:08, Ethan Dicks wrote: > Oh... a little tip - I have proven that the 6520 on the display board can > be replaced with an 6821 (I have a number of 6821s since they were used to > drive the printer port and the diagnostic display for the original COMBOARD > model). We used to do that for the user ports on PETs. We had a lot of PETs, and found the 6520s on user ports could be rather fragile, but 6821s were rather better. -- Pete Peter Turnbull Network Manager University of York

21 years, 8 months

1
0
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almost....

by waltje＠pdp11.nl

Hiyall, Hmm, this is almost on-topic here, and contains a fair bit of electronics and puter stuff. I wonder whether they'll include the engineerings drawings. http://cgi.liveauctions.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=225629… And, just for the record: yes, I am bidding, and no, not affliated. --fred

21 years, 8 months

6
6
0 0

RM02/3 drives and CDC9762

by pechter＠ureach.com

>Message: 1 >Date: Tue, 13 Jul 2004 17:32:21 +0800 >From: Wai-Sun Chia <waisun.chia(a)hp.com> >Subject: CDC 9762 vs. RM02/03? >To: General(a)caspar.my.cpqcorp.net, > "Discussion(a)caspar.my.cpqcorp.net":On-Topic Posts Only > <cctech(a)classiccmp.org> >Cc: cctalk(a)classiccmp.org >Message-ID: <40F3AC25.7080303(a)hp.com> >Content-Type: text/plain; charset=us-ascii; format=flowed > >I have some conflicting info here. On one hand the literature says that >DEC rebadged the CDC9762 as RM02 and RM03s... > Rebadged and had modified (CDC supplied a slightly modified SMD interface for DEC to interface to. >OTOH, the CDC has a SMD interface yet the RM02/03 has a MASSBUS interface. > The SMD interface (modified by DEC) goes to a Massbus adapter housed in the drive cabinet under the drive. DEC also used a similar technique on RP04/5/6's which used a DCL (Drive Controller Logic IIRC) to interface to the Massbus >from the internal drive logic levels. DEC modified the SMD signals on the RM02/RM03/RM05 to make them slightly different from standard SMD versions and they also used the CDC high altitude heads to reduce crashes. >Furthermore, the CDC is listed to be at 80MB, yet the RM02/03 apparently >has 67MB only. > RM02/RM03 is 80mb unformatted 67 formatted. CDC sold the drive which could be set to many different sector sizes and sector counts per cyl. So the DEC was 31 or 32 (IIRC) sectors of 512 bytes per track. CDC topped out with 33 sectors... IBM Series 1 systems I worked on used 256 byte sectors IIRC. >So, which is true? I'm confused. > > >Thanks. >/wai-sun > > Bill Pechter ex-DEC Field Service -- Bill Pechter Systems Administrator uReach Technologies 732-335-5432 Office 877-661-2126 Fax 877-661-2126 uNumber

21 years, 8 months

2
1
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B1955

by aek＠spies.com

It was the first TTL machine Burroughs made -- oops.. thought the 1965 was. Microcode cache was the big change for the 1965? Al has my notebook on the follow-up machine -- Which I need to return to you. There is a LOT of new information up on bitsavers now, Steve you may want to check out. -- is the Computer History Museum ever going to be interested in resurecting the B1955 they have?? -- I hope so, but they have two major restoration projects going on right now (pdp-1 and 1401) so they probably won't want to do anything until after those.

21 years, 8 months

1
0
0 0

Connector question...

by dholland＠woh.rr.com

Hi, I'm getting around to doing something w/ that RS/6000 59H (finally) - Backup server for my network. So I Epay for a 10/100 MCA NIC, (No, 10Mbs won't do for the amounts of storage involved). I've had a Sun Storage Library in the basement for a while, get AIX re-installed, and the box on the LAN.. And then I go to plug the library into the SCSI connector. Wots this.. Hmm, not HD50 like I thought.. Hmmm Google..Google..Google... And an hour later Google has told me very little. Anyways, the SCSI card is a IBM's SCSI-2 Fast/Wide card # 71G2589. The connector itself has 68 'pins' (says so on the connector) Looks more like a Centronics connector but is smaller, and has more than 50 pins. (Or you could say it looks like a SCA connector, but is missing 12 pins.) Its also to "big" to be VHDCI. Hopefully I'll be able to re-ID the harddrives in the system, and connect the library onto the other end of the SCSI chain, and get it connected that ways. (Otherwise, I'll be looking at interfacing the library to a SGI Indy (or Octane). The RS/6000 is at least more impressive looking.) Anyways, I'm annoyed now, and would at least like to know what that connector is, and where I can get an adapter/cable for it. (whatever this is to HPDB50) Anyone out there own a "Mallet-O-Understanding", and feel like beating me about the head and shoulders w/ it? :-) Thanks, David

21 years, 8 months

1
0
0 0

Burroughs B1955

by aek＠spies.com

> How old is a 1955? Early 80's. Second to last generation of machines that started with the B1700 in the early 70's > What is the blinkenlight count like. 24, rotary switch, and row of paddles. > Is it compatible with anything better-known? B1700 -> B1800 -> B1900 (B1000) It's cool because there wasn't a single macroinstruction set. The operating system and every language had its own pagable microcode. Was saying on nerdnite last monday that Burroughs managed to come up with some really interesting architectures for a really boring segment of the computer industry (banking)

21 years, 8 months

2
1
0 0

Burroughs B1955 (update)

by mike＠corestore.org

On Fri, 23 Jul 2004 18:03:49 -0400 (EDT), you wrote: >> PLEASE! save this from the scrapper! > >I have decided to try. I have now talked with the owner of the system, and >he is quite nice and reasonable. So if anyone else plans on bidding: > >PLEASE LET ME KNOW. NOW. > >By the way, he really does mean 50 some terminals and 20 some printers! We >guesstimate at 7 skids of stuff. > >William Donzelli >aw288(a)osfn.org Go for it... I grabbed a large pdp-12 configuration, with software and manuals, plus a bunch of spares, including a complete spare CPU, last week, so my good Karma is adequate at present. I'd probably have had a hack at it if no-one else did, but if you know *anything* about Burroughs you know more than I do, so.... PS William: still haven't forgotten your LINC-8 hulk, still interested in pursuing that, would like to come and have a look some time. PPS anyone reading this: my pdp-12 is missing one vital feature, the tall, narrow green door that covers the I/O terminals etc. Anyone by any miracle got a spare? And, sorry for missing VCF-East; I screwed-up my dates, we only got back from vacation in Scotland on Sunday. I had planned to get back the weekend *before* VCF. Corestore will be out in force next year! PPPS Al: are we missing any important pdp-12 software or docs for bitsavers? Mike http://www.corestore.org 'As I walk along these shores I am the history within'

21 years, 8 months

1
0
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Burroughs B1955

by aek＠spies.com

If people are curious about the details, I've been scanning a LOT of 19xx material lately. The 1955 was the last of the 1000 series to have a control panel with lights and switches, too (it is under the right front door in the main cpu cabinet) and has the classic panel layout of the earier models which were visible on the front. d

21 years, 8 months

3
2
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Disaster Recovery?

by vcf＠siconic.com

On Fri, 23 Jul 2004, Morgan Tamplin wrote: > I'm not sure if you received my previous message regarding my possible > attendance at VCF East. I registered on-line "just in case". As it > turned out, I was not able to attend for a number of reasons, the last > being the constant rain on Thursday, July 15, which would have meant bad > driving. > > The same rain caused local flooding in Peterbough, Canada. There was no > loss of life but much property damage including some of my computer > collection housed in a "low-lying" storage facility. I have spant the > past week doing cleanup. Unfortunately much of my documentation (in boxes > on the floor) was soaked beyond recovery but I would appreciate any > advice on possible restoration (or not!) of water-damaged electronics. > Even links to web sites or discussion groups would be helpful. Hi Morgan. This is very unfortunate! The best thing to do is immediately transfer the wet documents to a freezer. This will effectively freeze-dry the documents and give you a chance to recover them. There have been numerous discussions on the Classic Computers mailing list about this in the past, and so I've copied this reply to that list. I would ask that anyone posting replies please also post a reply to Morgan directly (see his e-mail address in the header please). Good luck! -- 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, 8 months

1
0
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Lost a radio at VCF East?

by vcf＠siconic.com

I'm missing a radio (walkie-talkie) and two wall warts that were at VCF East. I'm pretty sure they got stolen from my luggage by some fucker at either the TSA or JetBlue, but on the off-chance that I somehow left them behind and they did not get noticed, did someone else pick these up by accident? The radio is made by Maxon...all black, two channel. Just covering all my bases before I file a larceny report. Thanks! -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

21 years, 8 months

1
0
0 0

Burroughs B1955

by jwest＠classiccmp.org

If I had room, I'd grab this one in a heartbeat. :( Jay --- [This E-mail scanned for viruses by Declude Virus]

21 years, 8 months

1
0
0 0

Burroughs B1955

by mike＠corestore.org

On Fri, 23 Jul 2004 09:16:00 -0700 (PDT), you wrote: > >PLEASE! save this from the scrapper! > >The Computer History Mueseum has one of these and one of the stops I made last >month was to one of the last field service guys who maintained those systems >and picked up all of the documentation, field diags, and a complete set of >cards that he still had left. I'm hoping Mike (corestore) will be interested >but it is a BIG system, as you can tell from the pics. >--- > >There is a B1955 mainframe system on Ebay right now, with just about a day >left: > >http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=5109222569 Oh feck... Louisiana is a long way... wish there were some better pics, I wouldn't know any Burroughs kit if it fell on my head. Not something I've ever looked at. How old is a 1955? What's the blinkenlight count like? Is it compatible with anything better-known? Mike http://www.corestore.org 'As I walk along these shores I am the history within'

21 years, 8 months

1
0
0 0

Burroughs B1955

by aek＠spies.com

It may have been a different model but it was the same vintage. I've got some 5.25" floppies from it if anyone cares or wants copies, I think it's most of the OS. - That would have been a B1965 or later with the 'soft' console, which replaced the front panel and cassettes. I'm VERY interested in any tapes, floppies or docs for these systems and if anyone turns up a B1965 CPU or later PLEASE contact me, as a friend of mine who designed the 1965 CPU would like to have one.

21 years, 8 months

1
0
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Burroughs B1955

by aw288＠osfn.org

There is a B1955 mainframe system on Ebay right now, with just about a day left: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=5109222569 This is a circa 1980 system - it is sort of large. It looks complete, but it really is hard to tell. I really don't think I can go save* this beast, so I am passing this on. Anyone in the South (Louisiana, I think) interested? Old B machines are very rare, and very much worth saving (it has an interesting architecture, too!). Only if all of the moons line up will I bid on this, so if someone else is pretty sure they will move on it, please let me know. I would rather have a coordinated effort here. *The high bidder (at one buck) is a scrapper - check out the auctions he has won inthe past. William Donzelli aw288(a)osfn.org

21 years, 8 months

4
3
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printing pdf manuals

by jwest＠classiccmp.org

I recently got an upgrade for my Laserjet 4+ printer. It included a duplexer, 64mb ram upgrade, envelope feeder, and extended paper tray. I've printed off a few manuals on 3 hole punched paper from Al's bitsavers site and I've been really happy with the setup & results. However I have a question perhaps some here can answer... If one has a separate paper tray on their printer for, say... 11x17 (schematics), will adobe pdf reader software print all the pages on regular paper, and as it's going along, notice which pages in the PDF file are bigger (11x17, or legal, etc.) and print those pages "in-line" from the other paper tray? My thought is... after printing, I could take the stack of printout and fold in the long schematic pages before dropping it in a binder. I have no idea if adobe acrobat reader does this "sensing of paper size on each page" or not. Anyone have any thoughts on this? Lots of the manuals I want to print have fold-out schematics pages sprinkled throughout normal 8x11. If this cant be done, I was thinking I could print all pages except the big size ones (by looking at each page :\), then print those separately but thats a pain and I don't know if I can say to exclude certain pages. Thanks for any thoughts/advice! Jay West --- [This E-mail scanned for viruses by Declude Virus]

21 years, 8 months

2
1
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are you still interested in buying an osborne 1 computer?

by davi＠comcast.net

And how much are you offering to pay?

21 years, 8 months

7
6
0 0

Xerox Sigma VII --- big IRON

by ghldbrd＠ccp.com

Just reminiscing over my first encounter with computers back in 1970 ----- It was a Xerox Sigma VII in the basement of the Montana State University. REAL batch programming, with stacks of punchcards, and a really crappy compiler that burped when it hit the first error. APL was done via dialup terminal and Teletype machine --- dial the number and plug in the handset (Ma Bell wouldn't allow direct connection of modems to their phonelines back then). Does anyone have a picture of said critter? I'd like to get one just for memory's sake. Sigma VII was a computer one loved to hate. Gary Hildebrand St. Joseph, MO

21 years, 8 months

2
2
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IBM RISC System/6000 58H available

by vcf＠siconic.com

I've got an IBM RISC System/6000 model 58H available for sale. According to the spec sheet on this page: http://www.s6000.com/modelpr.html ...it's a 55Mhz Power2 system with 32K I cache and 256K D cache (no, I don't know what any of this means). I don't want much for it. I'll be willing to ship it if you really want it that bad (it's not heavy but it is large). Make a reasonable offer and it's yours. Local pickup will get preference. -- 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, 8 months

1
1
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OT: Bell&Howell TSC-200 System Calibrator????

by SUPRDAVE＠aol.com

At 08:28 PM 7/22/04 -0400, SuperDave wrote: >In a message dated 7/22/2004 7:20:42 PM Eastern Daylight Time, >rigdonj(a)cfl.rr.com writes: > I found one of these a couple of days ago. Does anyone here know anything >about them? I'm trying to figure out what some of the pushbuttons do. >I work for the company, but all info on older stuff cannot be found. : Wonderfull! :-( Do you know if B&H built professional grade test :equipment? This looks far too complex inside to be for a hobbiest. BTW :these don't seem to be too rare. I searched the net and found several for :sale but no one has any info on them. We're actually Bowe Bell and Howell, because of Bowe Systec AG merger. It seems that anything that's not document printing and mail inserting and handling (which is what BBH is known for) is all but forgotten about. I'll have to ask my boss about the old skool days.

21 years, 8 months

1
0
0 0

IRIX 5.3 and 'configure' utility...

by julesrichardsonuk＠yahoo.co.uk

Ok, I'm starting to get a nice little Indy system together now :-) Any ideas where I can get the 'configure' utility from? (hopefully there's a version that can be made to work with 5.3). Not sure where it is, or if it's buried in some random collection of stuff. cheers, Jules

21 years, 8 months

9
14
0 0

MDS series II again

by aek＠spies.com

I have been thinking about the series II schematics you have. Any chance of sending them to me (on me of course), so I can get them down to Kinkos to copy? -- Are you looking for Intellec Series 2? Monitor on top, boards load from the front?

21 years, 8 months

2
1
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OT: Bell&Howell TSC-200 System Calibrator????

by SUPRDAVE＠aol.com

In a message dated 7/22/2004 7:20:42 PM Eastern Daylight Time, rigdonj(a)cfl.rr.com writes: I found one of these a couple of days ago. Does anyone here know anything about them? I'm trying to figure out what some of the pushbuttons do. I work for the company, but all info on older stuff cannot be found. -- I am not willing to give up my liberties for the appearance of 'security'

21 years, 8 months

2
1
0 0

Anybody going to VCF-East have cheap working Oscilloscope/Logic Analyzer to sell?

by cbajpai＠comcast.net

I have a couple of old 8K PET 2001s that need to be fixed.if anyone has some extra test equipment that they no longer need I (and the PETs) would really appreciate it! Let me know what you have and want for it. Even if you aren't going to VCF/East I'd pay all the shipping costs. Looking forward to seeing you guys at VCF/East! Thanks, Chandra

21 years, 8 months

7
12
0 0

OT: Bell&Howell TSC-200 System Calibrator????

by rigdonj＠cfl.rr.com

I found one of these a couple of days ago. Does anyone here know anything about them? I'm trying to figure out what some of the pushbuttons do. Joe

21 years, 8 months

1
0
0 0

Anybody here work on HP 7905/7920 disk drives?

by dwight.elvey＠amd.com

Hi Joe Water doesn't even touch the goop I'm seeing. :( Dwight >From: "Joe R." <rigdonj(a)cfl.rr.com> > > Soap and water usually cleans up the black foam. I'm not sure about this >green stuff. The black stuff practically dissolves in water. > > OH HELL! I'll go find out. Yeap. Water took MOST of it right off. I've >cleaned up everything and it's drying now. I'll try to take some pictures >tomorrow. > > Joe > >At 01:58 PM 7/22/04 -0700, you wrote: >>Hi >> What is the best way to clean this self-destructing foam. >>I've tried a couple of things without luck. >>Dwight >> >> >>>From: "Joe R." <rigdonj(a)cfl.rr.com> >>> >>>At 11:57 AM 7/22/04 -0500, you wrote: >>>>I'd be quite interested in these, as I'm sure some other people would be >>>>too. Any chance we could get pictures? >>> >>> They wouldn't do any good. There's pieces of green foam stuck all over >>>the parts. >>> >>> Joe >>> >>> >>>> >>>>Jay >>>>----- Original Message ----- >>>>From: "Joe R." <rigdonj(a)cfl.rr.com> >>>>To: <cctalk(a)classiccmp.org> >>>>Cc: <dancohoe(a)oxford.net> >>>>Sent: Thursday, July 22, 2004 10:39 AM >>>>Subject: Anybody here work on HP 7905/7920 disk drives? >>>> >>>> >>>>> Went scrounging yesterday and found a small plastic box of what looks >>>>> like HP disk drive test/alignment accessories. Parts include 07905-60049, >>>>> 07905-60039, 5061-1386, 07920-60030 and 07920-62421. Anybody need this >>>>> stuff? The box is filled with that old self-disintegrating foam so the >>>>> stuff will need to be cleaned up but it looks like it's in very good >>>>> condition (the box is in rough shape). >>>>> >>>>> Joe >>>>> >>>> >>>> >>> >> >> >> >

21 years, 8 months

2
1
0 0

Commodore Pet ROM trouble... EPROM Substitutes...

by RMaxwell＠atlantissi.com

Oops. Error! Correction: The 2532 Vpp is always +5V when reading, and would keep 2732 outputs always OFF. The 2532 has just one enable pin, while the 2732 has two. Better to tie 2732-20 to ***2532-20*** (or to GND - outputs would be always enabled when the chip is selected). Sorry 'bout that. Best of luck, Bob

21 years, 8 months

1
0
0 0

Commodore Pet ROM trouble... EPROM Substitutes...

by pete＠dunnington.u-net.com

On Jul 22, 21:17, Philip Pemberton wrote: > In message <10407221840.ZM22794(a)mindy.dunnington.u-net.com> > Pete Turnbull <pete(a)dunnington.u-net.com> wrote: > > On Jul 22, 13:09, wolfgang(a)eichberger.org wrote: > > That should certainly work for reading. > > > Not if those pin names are correct. !G is Output Gate, i.e. !OE. I'd connect > all the pins straight through, except 18, 20 and 21. > > 2532 socket 2732 ROM > 18 A11 21 A11 > 21 VPP no-connect > 20 !E (PD/PGM) 18 !E > 14 Vss 14 and 20 (Vss and !G respectively) > Anything else is connected straight through > > I *think* that'll work. The only difference is that this grounds the 2732's > !G (Output Enable) pin instead of rigging it high (Vpp is usually connected > to +5V for EPROMs that are wired for reading only). Yep, well spotted. -- Pete Peter Turnbull Network Manager University of York

21 years, 8 months

1
0
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