test-drb

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Lecture: Get to know the PDP-8 through emulation, 2021-04-10, 19:00

by stueberahoo＠yahoo.de

Hi all, you're invited to the Update computer club[0] public lecture series "Updateringar"[1]! Update is a Swedish computer club founded in 1983 whose members tinker with all kinds of computers, from Raspberry Pi to PDP-12. The club has a big collection of historic computers. In this lecture series we'll talk about everything related to computers: Historic and modern computers, operating systems, programming, hardware projects, creating art with computers, building a computer museum, and more. We'll start with a classic: the PDP-8. When: 2021-04-10, 19:00 CEST Where: https://bbb.cryptoparty.se/b/upd-0mo-m2u-aq8 Get to know the PDP-8 through emulation An emulator is a program that pretends to be a computer different from the one the emulator is executing on. This allows execution of software intended for a physical computer that you do not have. In this talk Pontus will explain the basics by implementing a fully working PDP-8 emulator and explaining each instruction and feature along the way. The end result is a working emulator in less than 1000 lines of C code. And hopefully you will walk away with both an understanding of the classic PDP-8 computer and emulation. Pontus Pihlgren (Update) The lecture is free and open to everyone. Upcoming: 2021-05-08, 19:00: Forth on microcontrollers. Crest (CCCHB) Hope to see you there, Anke [0] http://www.update.uu.se/index_eng.html [1] https://www.update.uu.se/wiki/doku.php/projekt:updateringar

5 years

Not sure if I posted this, but the Saturn Calc and WP disks

by cz＠alembic.crystel.com

Are up on https://www.crystel.com/pdp For RT11/TSX, let me know if they work. CZ

5 years

Looking to buy any of the IR. INTERNATIONAL RECTIFIER KITS WITH SOLAR RADIOS OR SOLAR RADIO EXIMERMENTS FOR SMECC MUSEUM'S SOLAR ELECTRONICS DISPLAY. -- ALSO INTERESTED BY SOME BY OTHER MAKERS TOO ...EMAIL US OFF LIST PLEASE

by couryhouse＠aol.com

Looking to buy any of the IR. INTERNATIONAL RECTIFIER KITS WITH SOLAR RADIOS OR SOLAR RADIO EXIMERMENTS? FOR SMECC MUSEUM'S SOLAR ELECTRONICS DISPLAY.? -- ALSO INTERESTED? BY SOME BY OTHER MAKERS TOO ...EMAIL US OFF LIST PLEASE

5 years

by couryhouse＠aol.com

Sad but true it all looks the same to me most times . In my life time I have typed far more upper case material than upoer...lower stuff.. In usaf the typewriters? we used to send massive? Mars radio messages between name. And families.... had no lower case Them the years of teletypes,and upoer case computer terminals. .. it's been a hard life... alas On Sunday, April 4, 2021 Tony Aiuto via cctalk <tony.aiuto at gmail.com; cctalk at classiccmp.org> wrote: On Sun, Apr 4, 2021 at 9:44 PM Adrian Stoness <tdk.knight at gmail.com> wrote: > im pritty sure? he uses his teletype to send us emails > LOL.? No excuse.? I like old hardware, but that doesn't mean I use it for real work. My hand cranked drills are to show my grandchildren. My 18V battery drive is what I actually use. > > On Sun, Apr 4, 2021 at 8:17 PM Tony Aiuto via cctalk < > cctalk at classiccmp.org> wrote: > >> Ed. When you type in all caps it looks like you've been owned. Can you >> tone >> it down so we know it is real mail. >> >> On Sun, Apr 4, 2021 at 6:54 PM ED SHARPE via cctalk < >> cctalk at classiccmp.org> >> wrote: >> >> > >> > >> > >> > Looking to buy any of the IR. INTERNATIONAL RECTIFIER KITS WITH SOLAR >> > RADIOS OR SOLAR RADIO EXIMERMENTS? FOR SMECC MUSEUM'S SOLAR ELECTRONICS >> > DISPLAY.? -- ALSO INTERESTED? BY SOME BY OTHER MAKERS TOO ...EMAIL US >> OFF >> > LIST PLEASE >> > >> >

5 years

by couryhouse＠aol.com

Exactly spend years with those too... I am old On Sunday, April 4, 2021 Chuck Guzis via cctalk <cclist at sydex.com; cctalk at classiccmp.org> wrote: On 4/4/21 8:28 PM, ED SHARPE via cctalk wrote: > > Sad but true it all looks the same to me most times . In my life time I have typed far more upper case material than upoer...lower stuff.. > In usaf the typewriters? we used to send massive? Mars radio messages between name. And families.... had no lower case > > Them the years of teletypes,and upoer case computer terminals. .. it's been a hard life... alas > What's wrong with upper case?? Do you know of any keypunches with lower case? --Chuck

5 years

SOT: Scanning old computer docs

by guykd＠optusnet.com.au

At 12:19 AM 3/04/2021 -0600, you wrote: >On 4/2/21 10:27 PM, Guy Dunphy via cctalk wrote: >> There are defects in your 'good' flatbed image too - for eg the >> bleed-through of the orange lettering on the other side of the >> sheet. The way to correct that is to use a black, highly light >> absorbent backing sheet. Eg black velvet. > >Hum. > >Why do so many scanners come with glossy white (usually on foam) backing >to hold the image down? > >I'm questioning why they do that, not your recommendation. I think it is a combination of habit, and marketting/customer expectations. People intuitively expect the white backing, and for many scanning tasks it is preferable. Yet for scanning anything printed on both sides of thin paper, it's a real problem. I have a sheet of matt black plastic, and some black velvet cloth for this. The plastic is easier to use, but the velvet works better for really thin paper with a lot of visual bleed through. The more light absorbent the better. If I ever find a sheet of 'vanta black' (new light absorbent substance, very close to 100%, look it up) I'll be using that. That's not the only 'strange & unfortunate lack' in typical scanners. Another is that the raised plastic bezel goes all the way round the glass, rather than having at least one of the glass long sides be flat right to the edge, with the scanner sensor also going very close to the edge. This is needed for scanning sheets larger than the bed, and also very essential for scanning pages of books that are too thick to allow getting any page flat on the typical scanner bed. There are special 'edge scanners' that allow this - draping the book over the side of the scanner, so one page can be fully flat on the glass. They cost _much_ more than normal scanners. And yet the actual construction has very little that would cost more to manufacture. Construction is just arranged a little differently. The higher cost is another case of 'marketting.' Guy

5 years

IBM cpu tear down

by kl＠2k.ca

https://www.righto.com/2021/03/logic-chip-teardown-from-vintage-ibm.html Enjoy.

5 years

Video presentations on 2 interesting OSes for vintage kit

by lproven＠gmail.com

Minerva and SMSQ/E, both related to Sinclair QDOS, the original OS for the Sinclair QL. https://youtu.be/yU0ptNyNqcI And EmuTOS, a FOSS recreation of Atari TOS & GEM, which reached v1.0 about 6 months ago. https://youtu.be/eqrM4TE5jTM I knew about the 1st 2, but this video taught me a lot. It's an insular community and most materials are aimed at people who already know about it. I wrote a blog post to explain a bit of the history and context: https://liam-on-linux.livejournal.com/78738.html Found via the m68k.info community: https://m68k.info/#sinclairql:video:SMSQE:mar2021 Which in turn I found when I asked if there were any 16-bit homebrew computers out there and learned of the Kiwi 68K: https://www.ist-schlau.de/ -- Liam Proven ? Profile: https://about.me/liamproven Email: lproven at cix.co.uk ? gMail/gTalk/gHangouts: lproven at gmail.com Twitter/Facebook/LinkedIn/Flickr: lproven ? Skype: liamproven UK: +44 7939-087884 ? ?R (+ WhatsApp/Telegram/Signal): +420 702 829 053

5 years

SOT: Scanning old computer docs

by trash80＠internode.on.net

If there is anyone on the list familiar with scanners I'd be most grateful for some advice please. Some time ago I bought a HP 8270 sheet feed (full duplex) scanner NOS. I wanted to digitise a whole heap of old computer documentation and for a little while I've been working through the big heap of stuff. But for quite some time I've had an issue with scans that go through the sheet feeder (irrespective of whether I do them double sided or not). Basically the problem is that anything that goes via the sheet feeder has issues with "streaks" in the document whereas anything done on the flat bed is perfect (I have some links to some examples below). By way of clarity, anything done on the flatbed the lamp traverses the flat bed to do the scan. For sheet fed items the lamp is moved to specific slot on the scanner and the sheet feeder takes over wrapping the document past the lamp. Given that flat bed scans are OK I don't think its an issue with the lamp. I've done the following things to try to resolve the issue with no joy: * Checked for any specific settings * Tried doing scans in grayscale * Tried increasing the resolution (default is 300dpi) to slow the speed that the document is fed through the feeder. According to HP the issue is a cleanliness one i.e. dirt on the glass can cause reflections. I've followed their instructions for cleaning the glass but still no joy. Flatbed example. https://drive.google.com/file/d/1jYiFzERiZiaq7-WoTiQ2eIzITn6giviR/view?usp=s haring Sheet feed example. https://drive.google.com/file/d/1WF4SHbwV3bVET_bzwIUiULywbCGZBf_V/view?usp=s haring Thank you!!! Kevin Parker

5 years

Any Interpress fans out there?

by paul＠mcjones.org

> On Apr 1, 2021, at 10:00 AM,Al Kossow <aek at bitsavers.org <mailto:aek at bitsavers.org>> wrote: > > > Interpress had nothing to do with the Alto > > Talk to Paul McJones re. Interpress translation I included Press-to-{PostScript,PDF} conversion in the program that generated http://xeroxalto.computerhistory.org, but I don?t have any code for Interpress.

5 years

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