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

by ittybittybytes＠gmail.com

So I finally got my hands on a pdp8/a at the University auction. It's the omnibus model that's built into a desk and called the Classic, short for CLASSroom Interactive Computer. I had no idea it was so heavy as it was loaded for me into the back of my pickup. I discovered it must be real heavy as the my F-150 groaned when loaded and when I came home and unloaded I almost herniated myself. There it sits, almost complete (without the VT52) but has an extra RL01/RL02 board. Is it the desk that gives it the weight. I know the dual RX01 are heavy, but the are the cage, power supply and boards real heavy in these things or is the DESK to blame. Until I put it on something that I can move around, it will sit in my driveway. I can run a terminal cable and an extension cord out to it to maybe boot it up after I do some more research on it to see if all the boards are there. One thing is not clear.n looking at the board numbers, it seems it doesn't have a memory board, but it might have memory aboard the CPU card. Is this right? It uses the newer cmos memory. It has the three board set that also was used in the KIT-1, but it also has a variety of other boards that I'll write down as soon as I can. Cheers Tom

15 years, 1 month

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identify this computer?

by legalize＠xmission.com

Sorry for the slight blur, it was taken with a camera phone. <http://www.xmission.com/~legalize/tmp/Photo.jpg> Any ideas? -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

15 years, 1 month

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Ferro Resonance transformer and IBM

by michael.99.thompson＠gmail.com

> From:?h.j.stegeman at hccnet.nl > Date:?Tue, 24 May 2011 17:08:31 +0200 > > I am restoring an old IBM terminal with a ferro resonance transformer. > I slowly increase the prim voltage with a variac. > At the same time I measure the sec voltages. > The normal voltage at the prim site is 240V > > At +/- 130V (prim) I have already normal voltage at the sec site. > (+5V , -18V etc) > The sec side is loaded and contains no regulators. > > Anyone any idea why at 130v everything is normal. > I don't dear to go to 220V > > Thanks for all your replies. > > Henk-- I just repaired two DEC ferroresonant power supplies that are 115VAC input. From 45VAC to 115VAC input the +10/-15VDC output is at the normal voltage. What you are seeing is the ferroresonant circuit at work. Our power supplies lasted just a few hours before the AC capacitor failed. I was able to find replacement "run" capacitors on eBay. You can't use "start" capacitors because they are not designed for a 100% duty cycle. Michael Thompson

15 years, 1 month

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How much do you like your PDP11?

by dgriffi＠cs.csubak.edu

I was looking around for pictures of PDP11 front panels and stumbled across this page. I think mass quantities of alcohol were involved. Have your eyebleach at the ready. http://www.schlabonski.de/zwiebeltuete.html -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

15 years, 1 month

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"Stan Veit's History of the Personal Computer" audiobook podcast

by david＠classiccomputing.com

"Stan Veit's History of the Personal Computer" audiobook podcast, chapter 4 http://bit.ly/izfPBD Loads a little slow - subscribe @ iTunes I would just like to bring this to everyone's attention. It is such a great book, and I have completed another chapter. I intend to start getting new chapters posted much sooner. Please also consider reading about Stan in the article I wrote last year, "Remembering Stan Veit" at http://classiccomputing.com/CC/Blog/Entries/2010/9/3_Stan_Veit.html Best, David Greelish, Computer Historian President, Historical Computer Society Classic Computing The Home of Computer History Nostalgia http://www.classiccomputing.com Retro Computing Roundtable podcast Stan Veit's History of the Personal Computer audiobook podcast Classic Computing Show video podcast Classic Computing Blog

15 years, 1 month

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Oscilloscope Recommendation

by jonas＠otter.se

> > The guidance I have had is that for a PSU an analogue 'scope is fine. > For > logic then a logic analyser is what you need. Are you talking about > some > other category of hardware? > > Regards > > Rob > IMO, keep it simple for the moment. If you are not used to using a 'scope and you are only intending to repair your PSU at the moment, stay with an analogue dual-beam 'scope with a bandwidth of 20 MHz or so. There are excellent ones available cheap on eBay or other places. Philips, Gould, Hameg or Kenwood made decent 'scopes. It will also do fine for audio and even some video work, should the need arise. Learn to use that, then if you really think you need something better, replace it. Tektronix 465 is a lovely 'scope but IMO overkill for what you need at the moment. OTOH, if you anticipate getting deeper into repairing stuff, by all means get a Tex 465, 475. HP 180 'scopes are nice too. /Jonas

15 years, 1 month

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Oscilloscope Recommendation

by technobug＠comcast.net

On 5/24/11 11:45 PM, Brent Hilpert wrote: >> Of course, just for vintage warm fuzzies, little can challenge an old >> Tektronix scope. I recently acquired a Tek 561A from a friend locally. >> Mmmm, vacuum tubes.... Turn on the scope, go get a beer while it warms >> up, measure and test with confidence. -- Ian > > Our radio museum here has several old 500-series tek scopes that I'd > love to refurbish and get working. There's a 4-channel plug-in in one of > them, too. Size, maintenance and fan noise might make them not-so-great > for regular use but it would be nice to be able to use them on occasion. > I loved the crispness of the trace and the blue tint of the phosphor in > the CRTs of that series. I wonder why Tek didn't continue using that > phosphor. The P11 phosphor was available on the 7000 series crates and the 400 series (455,465,475) portables as options. My 7844 has the pretty blue traces from the two-gun CRT as well as a 400 MHz backplane. I still make room and haul it out to make measurements requiring one of the off-the-wall plug-ins with which Tek populated that line of scopes. -> CRC

15 years, 1 month

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How much do you like your PDP11?

by tiggerlasv＠aim.com

On Wednesday, May 25th, at 2:01 CDT, Eric Smith wrote: > Does it really surprise you that some people love old computers? It doesn't surprise me that he loves his PDP-11. . . after all, who wouldn't ? . . . but a Sony Vaio? That's just sick. Hehe. T

15 years, 1 month

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Augat boards on eBay

by wmaddox＠pacbell.net

This fellow has multiple units of NOS Augat wire-wrap boards for $29.95 each. Seems like a good price given what the gold scrappers are paying these days, which is where they will likely end up if some vintage homebrew hobbyists don't snap them up... Item # 250823044454 http://cgi.ebay.com/Mupac-TLR8922-Proto-Board-Gold-Recovery-/250823044454?p… --Bill

15 years, 1 month

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9-track Tapes gotta go

by mtapley＠swri.edu

All, I still have an office full of magnetic tapes that I need to get rid of. If you need some, let me know. I'll box and mail to you if you are willing to pay postage. I'll put the rest on eBay and/or VCM soon if I can't give them away here, and if that doesn't do it, I'll (sadly) trash them. The tapes are reel-to-reel, mostly 10" full-size reels (~2500 feet of tape) but some smaller. Mostly 800 bits/inch, but some 1600. Some Black Watch, many other brands. All are used; the data on them is not proprietary or secret (a lot is UARS satellite data) but I don't know generally what it is or what format it's in. Most reels include the white surround clips with hooks to hang on racks. The tapes are in pretty good-appearing shape, and were stored in climate-controlled storage since new (I believe). Shipping will be from San Antonio, TX, area code 78254. Pick-ups welcome. Please respond by email here, and tell me what you want. I can't be much more specific than "soon" about when I'll start to auction or trash, so promptness would be good (but tardiness probably won't cost you much, if you are willing to prowl auction sites for them). -- - Mark 210-379-4635 ----------------------------------------------------------------------- Large Asteroids headed toward planets inhabited by beings that don't have technology adequate to stop them: Think of it as Evolution in Fast-Forward.

15 years, 1 month

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Genuine gonkulator cable

by dgriffi＠cs.csubak.edu

If anyone's looking for a gonkulator cable for your DEC VAX, check out Ebay auction number 200609594604 -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

15 years, 1 month

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OT : M3*0.6mm pitch screws

by tshoppa＠wmata.com

>> However, I am not sure 5-40 UNC screws are any easier to find (at >> least not over here, as I said, even getting the 'mormal' 2-56, 4-40, >> 6-32, 8-32 is difficult). And it's not 'right'. I might as well spend >> a couple of afternoons in the garage making the right screws. > There are some application-specific wierdnesses too. For example, > tacquets on US-made piston valvesets for musical instruments are 3- > 48. Fortunately, I do have a set of taps and a die for that > thread. ??? 5-40, 3-48 etc. are all perfectly "normal" sizes (any decent hardware store will have them, although I wouldn't place any bets on finding the odd numbers at say Home Depot) And Tony, maybe instead of calling it a 6-32 you would have better luck in the UK asking for a "computer case screw." The demise of "decent hardware stores" is perhaps a different thread. Tim.

15 years, 1 month

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OT : M3*0.6mm pitch screws

by tshoppa＠wmata.com

> As for the pitch, I used those pitch guages which conssit of little > strips of metal with accurately cut teeth in one edge. Alas my metric set > doesn't include 0.6mm ( which is odd, since it's common for M3.5 screws), > hut the imperial one that fits is 42tpi. 42tpi is about 0.605mm pitch. I > could beleive 0.6mm (it's not that accurate after all). The 40tpi > imperial gauge doesn't fit at all. I'd still bet a donut, that a 5-40 would fit just fine for anything without a long engagement. Tim.

15 years, 1 month

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DEC Scrap

by pspan＠amerytel.net

Hi All, I thought I would post to everyone at one time with this list rather than an individual emails, for expediancy. 6 ea LA 120's with keyboards, it looked like only the #7 button missing from 1 keyboard 3 ea LA 120's w/o keyboards 6 ea Dual 8" floppy drives made by SMS 3 ea combo 8" floppy and 10 mb Hard disk by SMS 6 ea dual 10mb bernoulli drives (IOMEGA) (also have cartridges) I also have 8" floppy drive media which was DEC formatted, though digging that out might be a little challanging. I think there is enough stuff here for everyone to get a little. Phil PS Please keep in mind that this stuff has been in a non-temp controlled storage for at least 6 years!!!!

15 years, 1 month

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Seeking : HP 13037D - HP 9706 inter connection cables

by hp-fix＠xs4all.nl

I'm looking for the inter connection cables to connect my HP 9706 drive to the 13037D MAC controller and to the HP 2114E. I'm also looking for cables to connect the HP 7970 tape drive to the HP 2114E. In return I can offer a trade with HP equipment or some kind of a beer fee. -Rik

15 years, 1 month

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Small racks for DEC gear

by silvercreekvalley＠yahoo.com

Hi Paul, Mine is the BA11-K (PSU at back). It is quite a deep case so needs the full size rack, but as I'm hoping to use a relatively small SCSI drive (with the appropriate card) dont need a CAB. I'm looking for something small with casters.

15 years, 1 month

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OT : M3*0.6mm pitch screws

by ard＠p850ug1.demon.co.uk

This is OT, in that they're not going to be used in a classic computer, but people here tinker with other devies too... I am repariign an old French office telephone at the moment, It is missing a number of screws, whih looked to me M3. I therefore (incorrectly) assmed there'd be no problem replacing them. Alas they are not standard M3. After measuring up some of the exisitng screws, they appear to be 3mm in diamter, 0.6mm pitch (standard M3 is 0,5mm pitch). A look in a 1943 Machinery's Handbook suggests this is a French metric thread. Does anyone know of a source of such screws? If I can't get them, I will have to make them I guess (and I think I can get a suitable die which will make life a lot easier), but I'd prefer to buy them. Ideally slotted cheese head, but I would consider just about anything. -tony

15 years, 1 month

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OT : M3*0.6mm pitch screws

by jonas＠otter.se

>> It is a French telephone after all ;-) >> > > I am not sure if you're implying that that's why a 'French Metirc > Thread' > is likely to be correct or if you're saying 'It's French, it's bound > to > be odd'. Having maintained Citroen car for 13 years, I came to the > conclusion that French engineering is often strange, but equally it's > often very good (and ingenious). > I totally agree with you. I have no problems with French engineering at all. I have spent a lot of my childhood and adolescence in France and I love it. But they do like to do things their own way, so to speak ;-) Very good engineering but usually not like anybody else's. /Jonas

15 years, 1 month

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Small racks for DEC gear

by silvercreekvalley＠yahoo.com

I'd like to put my PDP 11/35 into a small rack - say a 12U, something that isnt too out of place in an office environment. This needs to be 'full size' ie having the required depth for a PDP 11, and also able to take the weight. Has anyone tried this? Most of the smaller racks I've seen tend to be for music gear, so are light weight and also not as deep as a 'full size' 19" rack.

15 years, 1 month

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Ferro Resonance transformer and IBM

by h.j.stegeman＠hccnet.nl

Hi all, I am restoring an old IBM terminal with a ferro resonance transformer. I slowly increase the prim voltage with a variac. At the same time I measure the sec voltages. The normal voltage at the prim site is 240V At +/- 130V (prim) I have already normal voltage at the sec site. (+5V , -18V etc) The sec side is loaded and contains no regulators. Anyone any idea why at 130v everything is normal. I don't dear to go to 220V Thanks for all your replies. Henk

15 years, 1 month

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844.8 KHz crystal on DEC board

by les＠frii.com

Colorado Crystal would make one for you, don't know much that would cost. http://www.coloradocrystal.com/ Les > On 5/23/2011 6:50 PM, Adrian Stoness wrote: >> got any odd XT searial cards theres a potential for there being one on them >> i have been told >> > > > Good idea but no luck so far, all of the old serial cards I could find > have an 18.432 MHz oscillator. > > I remember seeing many more Apple II's connected to Teletypes than PC's > so I'll check old Apple serial cards next. >

15 years, 1 month

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Looking for an Ann Arbor Ambassador terminal

by ian_primus＠yahoo.com

Well, it's been a good couple of months, and I've managed to acquire a couple of things I've been looking for for a long time. One elusive bit of hardware that I'm still trying to track down is an Ann Arbor Ambassador terminal. Unlike my "big" terminal grail (Tektronix 4010/4014), I've never seen one of these on eBay. I haven't seen one at all in a very, very long time. It probably doesn't show up simply because it's really not all that interesting from a historical perspective. Also, I'm not so sure they were very reliable. It's an ASCII only terminal, no graphics. I don't believe it's VT100 compatible. But it's got some neat features, it's fast, and has a very nice keyboard. So, does anyone even have one of these? I'd definitely be interested in acquiring one, but even if you don't want to part with it, it would be nice to know that there are still some out there. -Ian

15 years, 1 month

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Scraping DEC Equipment

by pspan＠amerytel.net

Hello all, I have several LA 120's with and w/o keyboards. All equipment has been in storage for many years. I am tearing apart for scrap. If anyone wants parts and is willing to pay shipping from Wisconsin and a small stipend for the parts and packaging, email me privately. Phil PS Later on VT 100's and 220's will be going. Other equipment such as 8" floppy drives and media.

15 years, 1 month

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OT : M3*0.6mm pitch screws

by tshoppa＠wmata.com

Fred writes: > On Mon, 23 May 2011, Shoppa, Tim wrote: >> I'd still bet a donut, that a 5-40 would fit just fine for anything >> without a long engagement. > Are you suggesting that ARD should use screws that are "almost the right > size"?? I was the same guy who once recommended that one should scavenge a spare board to get a terminal working, rather than repair the existing board :-). The moral equivalent here would be to have a "parts phone" that one strips for screws as necessary. Tim.

15 years, 1 month

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Oscilloscope Recommendation

by tshoppa＠wmata.com

> Before DSOs we had analog storage-tube scopes. Add this to the permutations: I've used a DSO to repair a Tek 4010 storage-tube terminal.

15 years, 1 month

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pdp things that are not pdp

by dgriffi＠cs.csubak.edu

Am I the only one who is mildly annoyed at all the various things with "pdp" in their model names that have nothing to do with older computers >from DEC? Compaq and Panasonic seem to be the worst, naming memories, power supplies, and toner cartridges with pdp-blahblahblah. -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

15 years, 1 month

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Scraping DEC Equipment

by CCTECH＠beyondthepale.ie

> >> I'm looking for a flyback transformer for a VT220 - I'm in Dublin, Ireland. >> >> As far as I can tell, there are at least two different types but hopefully >> only the mounting arrangements differ. > >I did some research on this a while back. In one model the flyback is an >easy field replace unit but in the other model the flyback is soldered >to the power board. > Mine is soldered to the board but I'm happy enough to adapt the other type to fit if it's the only one I can get. The other components seem to be the same so I am hopeful that the transformers do not differ electrically. Regards, Peter Coghlan.

15 years, 1 month

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How much do you like your PDP11?

by bqt＠softjar.se

On 2011-05-22 22.54, Roger Pugh<rogpugh at mac.com> wrote: > On 05/22/2011 10:15, David Griffith wrote: >> > I was looking around for pictures of PDP11 front panels and stumbled >> > across this page. I think mass quantities of alcohol were involved. >> > Have your eyebleach at the ready. >> > >> > http://www.schlabonski.de/zwiebeltuete.html > OK... own up.. Who has a PDP in their bedroom??????? LOL I used to live with a PDP-8/A in my bedroom for about 10 years. Running 24/7 for lots of those years... Nowadays, I'm more lazy, and only have a PDP-11/93 in the bedroom. The rest of my machines are in the cellar. Johnny

15 years, 1 month

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Scraping DEC Equipment

by CCTECH＠beyondthepale.ie

> >PS Later on VT 100's and 220's will be going. Other equipment such as 8" >floppy drives and media. > I'm looking for a flyback transformer for a VT220 - I'm in Dublin, Ireland. As far as I can tell, there are at least two different types but hopefully only the mounting arrangements differ. Regards, Peter Coghlan.

15 years, 1 month

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PR1ME Computer SE50M

by michael.99.thompson＠gmail.com

> From:?Dennis Boone <drb at msu.edu> > Date:?Tue, 17 May 2011 13:10:04 -0400 > The CPU boards are in the upper backplane, the two or three boards > connected via top-hats. ?They'll have a label on the back edge giving > the board model number. ?I can probably look them up from that. > > The numbers will be in one of two formats: 9999-999, or TLA10999-999. Upper CPU Board, P/N 6282-401 Lower CPU Board, P/N 6281-401 Upper Two Memory Boards, P/N 12512-E8 Middle Two Memory Boards, P/N 7615-902 Lower Two Memory Boards, P/N 230-010-904 I/O Boards 2034-901 TLA10019-0012 2302-004 4005-901 2384-004 2301-901 In a box 6105-402 Pictures and part numbers of the boards are at: https://sites.google.com/site/ricmwarehouse/Home/equipment/prime-computer-s… It would be nice if you could also identify the memory and I/O boards. Thanks for your help. There doesn't seem to be much hardware documentation available for Prime systems. -- Michael Thompson

15 years, 1 month

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seeking pdp 11/70 front panel

by dgriffi＠cs.csubak.edu

Once again, I'm checking around to see if anyone has a pdp 11/70 front panel with bezel they'd be willing to sell or trade. I have some IMSAI front panels, an Altair or two, and several complete S100 systems to offer in trade. -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

15 years, 1 month

3
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OT : M3*0.6mm pitch screws

by tshoppa＠wmata.com

> Alas they are not standard M3. After measuring up some of the exisitng > screws, they appear to be 3mm in diamter, 0.6mm pitch (standard M3 is > 0,5mm pitch). A look in a 1943 Machinery's Handbook suggests this is a > French metric thread. Maybe wrong side of the pond but: Is it possible that they are 5-40 thread? (3.1mm major diameter, 0.635mm pitch). 5-40 is still common today on barrier strips and I know was even more common on US phone and telecom equipment from 60, 70 years ago. I would not be surprised if barrier strip screw sizes had crossed the pond 70 years ago. Reminds me of the Russian hi-tech chilled water cooling unit we had delivered in the 80's, we thought from the drawing it had some funky metric thread and we called around to all the US metric specialty houses without luck, before we figured out that it was just standard garden hose thread :-) ! Tim.

15 years, 1 month

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OT : M3*0.6mm pitch screws

by jonas＠otter.se

On 2011-05-21 19:00, Tony Duell wrote: > I am repariign an old French office telephone at the moment, It is > missing a number of screws, whih looked to me M3. I therefore > (incorrectly) assmed there'd be no problem replacing them. > > Alas they are not standard M3. After measuring up some of the exisitng > screws, they appear to be 3mm in diamter, 0.6mm pitch (standard M3 is > 0,5mm pitch). A look in a 1943 Machinery's Handbook suggests this is a > French metric thread. It is a French telephone after all ;-) Some quick Googling on French sites tells me that this is an old standard ("S.I.") which does not seem to be used any longer, not even in France. This is a table of those threads:http://www.cijoint.fr/cj200809/cijkUPkub5.jpg They do not seem to be easily obtainable, not even in France. You will probably have to make them yourself, unfortunately. /Jonas

15 years, 1 month

2
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S-100 PCBs

by lynchaj＠yahoo.com

Hi! All the S-100 Console IO and S-100 4MB SRAM/FLASH PCBs are gone. If you were looking to get one please let me know and I will add you to the waiting list for the next batch. I still have a couple S-100 parallel ASCII keyboard interface, about ten S-100 EPROM/SRAM/EEPROM/FLASH, and a whole bunch of the S-100 Dual Serial IO, USB, and voice synthesis PCBs left. The good news is I am steadily plowing through the stack and getting these boards out to their builders. The next new boards will be the S-100 IDE V2 (improved dual IDE), S-100 8086 CPU, and S-100 6502 CPU. These will probably be done in the next few weeks. Please contact me at LYNCHAJ at YAHOO.COM if you have any questions. Thanks and have a nice day! Andrew Lynch

15 years, 1 month

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Vintage Portable Computing Suggestions?

by feldman.r＠comcast.net

>Message: 21 >Date: Wed, 18 May 2011 14:07:09 -0700 (PDT) >From: Fred Cisin < cisin at xenosoft.com > >Subject: Re: Vintage Portable Computing Suggestions? > >Howzbout: >HP95LX The 95LX runs MS-DOS 3.0, has a non-standard serial port, and non-standard screen, so I would go with the 200LX. >The tablet that Fujitsu came out with when they bought out Poqet This Poqet (the Poqet Plus, IIRC) can use more PC cards than the two earlier models (PQ165 and PQ181), but might be hard to locate. You will almost certainly need to rebuild the rechargeable NiCad battery. The earlier models use 2 AA batteries. >Antikythera!! I don't think that was programmable and I doubt that you can find one for sale. >iPaq pocket computers with Windoze CE ?(Palm Pilot competitor) > >You could probably install Windoze 3.00 on a Poqet! ? 8086??, CGA video Yep, I have Windows 3.0 on my Poqet PQ181 (the middle model). Works nicely with a Barbie (as in the Mattel doll) pen mouse, which might still be available from California Digital, but the serial port adapter is hard to find. If anyone is interested, I think I still have the artwork I made up to make a serial port adapter from printed circuit board. As to the HP LX palmtops, since they run MS-DOS, you can use any number of programming languages. I have used MASM and Turbo C 2.0 on both the 95LX and 200LX. I have a 200LX and?3 Poqets (only one is working, though), but I have heard good things about the Psion 5. Bob

15 years, 1 month

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OT: Kingston SDHC in SPI mode?

by cclist＠sydex.com

I'm putting this out because I know there are some who tinker with microcontroller applications on the list. I can't really get an answer from web searches. At any rate, I've got an ATMega AVR that I'm using with SDCards in SPI mode. I've got a random assortment of MMC and SD and SDHC cards and they all seem to work as expected--until I ran into a bunch of Kingston 4GB Class 4 SDHC cards (model SD-K04G). Then things fall apart. The cards function normally in SD mode. SanDisk 4GB SDHC cards work just fine. Here's the SPI conversation from its start: Sending: 40 00 00 00 00 95 Receiving: 01 Sending: 48 00 00 01 AA 87 Receiving: 05 Sending: 41 00 00 00 00 01 Receiving: 05 Note that both CMD8 and CMD1 fail with "illegal operation". I'm running the SPI clock at about 250KHz, so speed isn't the issue. Can anyone shed any light on this? --Chuck

15 years, 1 month

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pdp11 CPU on S100 board

by lynchaj＠yahoo.com

pdp11 CPU on S100 board? jim s jws at jwsss.com <mailto:cctalk%40classiccmp.org?Subject=Re%3A%20pdp11%20CPU%20on%20S100%20bo ard%3F&In-Reply-To=%3C4DD317BE.4050704%40jwsss.com%3E> Tue May 17 19:50:06 CDT 2011 * Previous message: pdp11 CPU on S100 board? * Next message: pdp11 CPU on S100 board? * Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] ________________________________ I have raised the issue of documentation for the Soviet parts with a fellow who posted here recently who lives in Moscow. He will help with getting documenation translated if it can be had. I passed him three auctions with the parts I believe people here could bid on and obtain. He also looked for some information and sent it to me. [snip] -----REPLY----- Hi Jim! Thanks! I appreciate your enthusiasm for the S-100 PDP-11 CPU board project. I am willing to capture a schematic in KiCAD, layout a PCB, and get some prototype boards for build and test. At S100computers.com and N8VEM home brew computing project we have a substantial library of free/open source S-100 board designs we could reuse and borrow from to reduce technical risk. However we are missing an important part of this project -- someone to the design the board! I know almost nothing about PDP-11 and certainly not enough to design an S-100 CPU board based on one. Nearly any S-100 CPU board is a significant design effort even with the mere 8080 which the S-100 supports almost natively. Were someone to send me a handwritten schematic I could capture it in KiCAD and send it out for review. Hopefully the datasheets can be made available or translated. That would be helpful. Also, a reliable source of the chips would be helpful too. However, I would like for people to have realistic expectations. This project won't happen unless an actual designer steps forward. This is a substantial project and it will require many skilled and able hands. It would also need someone to write and/or modify an existing free/open source PDP-11 operating system to use existing S-100 peripherals. I suspect that is a major task as well for which we have no volunteers. I would like to see this project happen but it is missing key participants to make it work. Thanks and have a nice day! Andrew Lynch

15 years, 1 month

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8" floppy containers

by shumaker＠att.net

response was surprising - everything is spoken for! Steve

15 years, 1 month

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This is a test.

by ian_primus＠yahoo.com

This is only a test, if this were a real message, then it wouldn't be a test. Just testing, for some reason, the last two times I've tried to reply to a list message, I get a bounce: Remote host said: 553 5.3.0 Spam blocked -Ian

15 years, 1 month

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Does anyone have a Zenith Z29?

by ian_primus＠yahoo.com

I've recently acquired a Morrow MDT 60, which, as far as I had always known, is basically just a Zenith Z29. Playing with it, it seems to have a rather brain damaged control character scheme, and insists on using parity no matter what. If you want a laugh, look at the MDT60 User's Manual, available on Bitsavers, and check out page 2-4 (PDF page 21). Even though switch 3 is defined as parity enable/disable, it's *also* defined in the table below, selecting which kind of parity to use... Therefore, it seems to me that disabling parity simply is not possible... Anyway, I took the back off and took a look at the board. Interestingly enough the logic board itself says "Morrow Terminal Bd", even though the casing and keyboard are clearly the same as the Zenith Z29. The monitor section itself definitely appears to be Zenith. I'm wondering if anyone has a Z29, if you could remove the back and take a picture of the logic board. It's really easy - three 1/4" hex cap screws and the rear pan just folds down. For bonus points, I'd love a copy of the terminal's ROM. I'm wondering just what is going on with this terminal. Did Morrow have Zenith make them? The other way around? Are the logic boards of the two terminals the same, with only different ROMs, or are they totally different devices? Is there any way to make the MDT60 not use parity and otherwise play nice with *nix systems? -Ian

15 years, 1 month

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empty 8" floppy containers

by shumaker＠att.net

Anyone interested in several cartons of empty 8" floppy boxes? A few are cardboard but most are the typical plastic unit. There are at least several dozen. Last chance before the recycler..... steve

15 years, 1 month

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pdp 8a loader?

by tdk.knight＠gmail.com

hi is there something like a abs loader for the pdp11??? reading my manual see somthing called rim loader but i think i am missing it inless its one of these? http://img859.imageshack.us/img859/8412/tapes4.jpg where its curently at http://www.youtube.com/watch?v=gDwBZPX_Qjo

15 years, 1 month

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empty 8" floppy containers

by shumaker＠att.net

wow - unexpected response! steve: the large flat rate is 12x12x5.5 so 3 will just fit on the short dimension... Adrian: not sure if flat rate goes to Canada - let me check Erik: I'm in Boulder Creek so we could meet someplace for the rest... steve

15 years, 1 month

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[OT] more Palm-hosted compilers

by vintagecoder＠aol.com

Here's an interesting freebie. I haven't tried it yet but it looks worth trying. Still actively developed, the guy is porting it to Android. http://www.ppcompiler.org/index.php?lng=en

15 years, 1 month

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WARNING! Avoid Craters and Freighters

by tshoppa＠wmata.com

>>>They demolished the >>>units of drawers, and who knows how much type they lost as they moved the >>>stuff half way across country (I'm told that there was loose type in the >>>truck and on the ground when they unloaded). I know it's easy to critique the craters mistakes but there is a point To be learned and I think it's fundamental: High density objects that May normally OK at rest in their usual low density containers, do not travel well unless measures are taken to prevent them from rattling around. Type in drawers is one example, but a more relevant one for this group would be big iron transformers on aluminum or steel sheet metal chassis. That chassis may be Perfectly fine at rest, but keep in mind that its Very likely the transformer was originally shipped separate from the chassis when The unit was new, 30 or 40 or 50 years ago. Every single instance I've seen where a supposedly professional packer/crater Screwed up, it was a high density object that wasn't taken into account that did The damage. I was not so much angry to see the damage inflicted by the transformer Rattling around in the chassis, as I was sad. Tim.

15 years, 1 month

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Vintage Portable Computing Suggestions?

by feldman.r＠comcast.net

>Message: 8 >Date: Wed, 18 May 2011 12:23:23 +0100 >From: Mark Wickens < mark at wickensonline.co.uk > >Subject: Vintage Portable Computing Suggestions? Get an HP LX 95, 100 or 200. The 200 is readily available, runs for weeks on 2AA batteries, and has MS-DOS 5 and a decent serial port. Screen is not backlit, but is fairly readable in daylight. Keyboard is calculator style, but has a numberic keypad in addition to the alpha keys and is not bad to use. Bob

15 years, 1 month

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WARNING! Avoid Craters and Freighters

by healyzh＠aracnet.com

Thanks to past comments here, I recommended the Library use Craters and Freighters to move a hot-press machine, and two units full of drawers of type. Big mistake. They dismantled the machine, after being told not to, and who knows if the damage they did can be repaired. They demolished the units of drawers, and who knows how much type they lost as they moved the stuff half way across country (I'm told that there was loose type in the truck and on the ground when they unloaded). Sounds like the only things they didn't demolish were the bolts of fabric. I've not been able to get over to view the carnage, and I'm not looking forwards to it. I also found that if you're using them to move stuff like computer equipment you have to sign off that they're not responsible for any damage they do. WTF! Zane -- | Zane H. Healy | UNIX Systems Administrator | | healyzh at aracnet.com | OpenVMS Enthusiast | | | Photographer | +----------------------------------+----------------------------+ | My flickr Photostream | | http://www.flickr.com/photos/33848088 at N03/ |

15 years, 1 month

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Going to Dayton?

by pat＠computer-refuge.org

I'm going to be going to Dayton again, with a pretty good mix of new, old, and non-computer stuff. I'll be in the same spaces as last year - FE3224/3225. Who else is going? -- Patrick Finnegan

15 years, 1 month

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WARNING! Avoid Craters and Freighters

by spedraja＠ono.com

This is surrealistic. Sergio 2011/5/18 Zane H. Healy <healyzh at aracnet.com> > Thanks to past comments here, I recommended the Library use Craters and > Freighters to move a hot-press machine, and two units full of drawers of > type. Big mistake. They dismantled the machine, after being told not to, > and who knows if the damage they did can be repaired. They demolished the > units of drawers, and who knows how much type they lost as they moved the > stuff half way across country (I'm told that there was loose type in the > truck and on the ground when they unloaded). > > Sounds like the only things they didn't demolish were the bolts of fabric. > > I've not been able to get over to view the carnage, and I'm not looking > forwards to it. > > I also found that if you're using them to move stuff like computer > equipment you have to sign off that they're not responsible for any damage > they do. WTF! > > Zane > > > > -- > | Zane H. Healy | UNIX Systems Administrator | > | healyzh at aracnet.com | OpenVMS Enthusiast | > | | Photographer | > +----------------------------------+----------------------------+ > | My flickr Photostream | > | http://www.flickr.com/photos/33848088 at N03/ | >

15 years, 1 month

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Important Xref data question.

by geoffr＠zipcon.net

Hey! I?m sick and tired of trying to find a good Xref database for componants, and am considering making my own. What information do you consider critical in cross referencing a part?

15 years, 1 month

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