August 2024 - cctalk - classiccmp.org

PiDPI-8/I revision question - version 2 - reposted

by Mike Katz

Oscar, I am building a second PiDP-8/I kit that I bought, unassembled, from a gentleman in the UK, a couple of years ago. The circuit board in the kit is labeled Rev 2.2 2016-02-16. You call this the 2016-18 version. This version did not come with the LED spacers or the LED cover bracket and the switches have a much larger front metal piece and have mounting holes in them. Would it make sense for me to buy the LED spacers, LED bracket and possibly the updated PC board for this kit before putting it together? If so how much should I send you? What else would I need to upgrade to go with the newest PCB? If I don't upgrade the PCB, Are there any cuts and jumpers that I should do before assembling the circuit board? What is the correct deposit switch inversion for this board? Will I have any problems running any of the Raspberry Pi versions on this kit (Zero through 5)? I will be benchmarking the new build of the PiDP SIMH software on a bunch of different Pi's so compatibility is an issue. Thank you, Mike P.S. Is there any chance you will be at VCF Midwest this year?

7 months

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Re: Free Vintage Computers - Manchester NH area

by Stephen Pereira

All, I have been contacted by an individual who will be taking the entire lot off my hands. Should this deal fall through for some reason, I will re-post my offer. smp - - - Stephen Pereira Bedford, NH 03110 KB1SXE

7 months, 1 week

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PdPI-8/I revision question - version 2 - reposted

by Mike Katz

Oscar, I am building a second PiDP-8/I kit that I bought, unassembled, from a gentleman in the UK, a couple of years ago. The circuit board in the kit is labeled Rev 2.2 2016-02-16. You call this the 2016-18 version. This version did not come with the LED spacers or the LED cover bracket and the switches have a much larger front metal piece and have mounting holes in them. Would it make sense for me to buy the LED spacers, LED bracket and possibly the updated PC board for this kit before putting it together? If so how much should I send you? What else would I need to upgrade to go with the newest PCB? If I don't upgrade the PCB, Are there any cuts and jumpers that I should do before assembling the circuit board? What is the correct deposit switch inversion for this board? Will I have any problems running any of the Raspberry Pi versions on this kit (Zero through 5)? I will be benchmarking the new build of the PiDP SIMH software on a bunch of different Pi's so compatibility is an issue. Thank you, Mike P.S. Is there any chance you will be at VCF Midwest this year?

7 months, 1 week

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Free Vintage Computers - Manchester NH area

by Stephen Pereira

Hello all, I am winnowing down my collection of Vintage Computer stuff to make space for other storage needs, and to make life a little easier on those who I will eventually leave behind. I have the following stuff available for free to pickup in the Manchester NH area: - Sun Sparc Classic, with hard disk, CDROM drive, keyboard, some documentation, very large Sun video CRT. - Power Macintosh 7200, with keyboard - Power Macintosh 7300, with keyboard - Osborne I (3 inch screen) - Osborne II (5 inch screen) - a couple of original Macintosh powerbook laptops - Tandy 2800 laptop (286 + 287, EGA LCD screen), plus another for spare parts - some sort of Toshiba laptop - Macintosh Powerbook clamshell, with USB, Firewire, & CDROM drive - boxes of books & parts & cables I have a few photos of these as currently stored in my basement. All “working when put into storage”. The basement is dry and dehumidified. I cannot vouch for working condition today because of decaying capacitors and internal batteries over the past 15-20 years. I would greatly appreciate someone to take the entire lot. I just do not have the energy to go through the eBay Selling & shipping with all this stuff. If anyone is interested, please email me and we talk and I can provide the few photos and my address for pickup. smp - - - Stephen Pereira Bedford, NH 03110 KB1SXE

7 months, 1 week

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Computers in the Paul Allen collection

by Paul Koning

I don't know how many of you have read through the whole Christie's listings, so I figured I'd summarize the computers that are in the Paul Allen auctions. There are two auctions: https://onlineonly.christies.com/s/firsts-history-computing-paul-g-allen-co… starting Friday, and https://www.christies.com/en/auction/pushing-boundaries-ingenuity-from-the-… on September 10th. In the first one, I see these computers (ignoring microcomputers and personal machines like Tandy computers): Lot 102, LGP-30 (and other stuff) Lot 106, IBM 650 Lot 107, IBM 7094 Lot 111, PDP-5 Lot 112, PDP-10 (KA10) Lot 115, Straight 8 Lot 116, Linc-8 Lot 117, PDP-7 Lot 118, CDC 6500 Lot 119, Xerox Sigma 9 Lot 122, HP 2100S Log 125, PDP-10 (KI10) Lot 135, IBM system 6 Lot 137, DECsystem-2020 Lot 138, LISP machine Lot 139, Xerox Star Lot 144, HP 1000 Lot 147, Cray-2 Lot 149, System Concepts SC40 In the second one: Lot 16, Bendix G-15 Lot 17, CDC 160 Lot 30, Xerox Alto Lot 32, Cray-1 Some of these seem like things that are not totally out of reach; I wonder if some of you are thinking about bidding. paul

7 months, 1 week

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PC04/05 punches, card reader, 11/40, 45, 70 front panels

by Paul Anderson

Found while cleaning and getting ready for VCFMW: 2 either NOS or refurbished paper tape punches for PC04/05. I would say these are rather uncommon, if not rare. Documation M200 card reader and a few boxes of cards. Also PDP-8 and 11 interfaces. Various front panels before they go on ebay. I will trade for coins at VCF Please contact me off list. Thanks, Paul

7 months, 1 week

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M920 (unibus backplane jumper) to M935 (omnibus)

by Paul Anderson

Does anyone remember how this is done? Or the BC11- to the one used in 8s? Thanks, Paul

7 months, 2 weeks

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VCF Midwest DEC "Nut" Party

by Mike Katz

For all of you who are DEC computer nuts (or aficionados) we will have our second annual DEC "Nut" pizza get together after the show at my house on Saturday (Sept 7th) after 7PM. I am unemployed so I ask all who attend to contribute to the cost of the pizza (beer and pop will be provided). Please see me at the show for my address. I hope to see you there. Mike Katz +1 (773) 414-1044 (Cell)

7 months, 2 weeks

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A little off-topic but at least somewhat related: endianness

by Peter Ekstrom

Hi to the group, I am tinkering with some C-code where I am working on something that can process some microcode. The microcode is from a DG MV/10000 machine and while working on it, I noticed it is in little-endian. That's simple enough to work around but that had me wondering, why do we have big and little endianness? What is the benefit of storing the low-order byte first? Or is that simply just an arbitrary decision made by some hardware manufacturers? I am mostly just curious. Thanks, Peter / KG4OKG

7 months, 2 weeks

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DEC parts at WCFMW

by Paul Anderson

If you want any DEC parts, boards, options, etc brought up to VCFMW please contact me off list. I will probably be there Saturday only and leave by 7. If you would like to stop by on the way to or from WCFMW, I should be available by appointment except Saturday. I am located about 10 miles west of Champaign, IL close to I-57, I-72, and I-74. I have PDP 8 and 11 (Qbus and Unibus) boxes, systems and parts, as well as printers and a few terminals. I have several vaxes for parts, and some 3100, 3000, and 5000- including -25, 125, 133, and 200. Please email me off list with questions,and I'll give you my # to call. I have dozens of backplanes and front panels ( including 2 11/70) and probably over 1000 boards. I also collect US and foreign coins and currency, and will take them in trade for computer gear. If anyone is driving in from the NYC/New Jersey area I need a few small things picked up there. Thanks, Paul

7 months, 2 weeks

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