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Is Ansgar Kückes on this list, or can someone put me in touch with him?

by bradmcook2013＠gmail.com

Hi all, Sorry to crash your party, but I'm doing research for a book and was hoping to connect with Ansgar Kückes, who owns this site about old school HP computers: https://www.hp9845.net/ Is he on this list? Or does someone know how to reach him? The contact methods on his site don't work anymore. Thanks. Brad

1 month, 1 week

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Unreliable Rotary Potentiometer

by Rob Jarratt

I have the contrast control on the monitor of my Olivetti M24 which has become unreliable, you only need to touch it and the display will disappear completely. It doesn't look too hard to replace the rotary potentiometer, but I was wondering if there is any way to "repair" it to keep the original part. It looks like this: https://1drv.ms/i/c/fc758a5a91b91301/ESPGlbvW5wxGpXPC5kXfzVMBTUUW96GThzDMqZ_ i8jq7tA?e=Ehmo1T Thanks Rob

1 month, 1 week

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reading DECtape

by Guy Fedorkow

We may have a half a dozen DECtapes, probably from the PDP-6 era, perhaps with ITS with content... Is there anyone, preferably in the MIT vicinity, who might have a working DECtape drive and be willing to try to read the tapes? Thanks /guy fedorkow

1 month, 1 week

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Re: reading DECtape

by Guy Fedorkow

Martin, Michael, Thank you! We don't have possession of the tapes yet, but, assuming that happens, I'll try RICM to see if their machines are working again. /guy fedorkow On 11/1/2025 1:00 PM, cctalk-request(a)classiccmp.org wrote: > Date: Fri, 31 Oct 2025 13:22:48 -0700 > From: Martin Eberhard<mfeberhard(a)gmail.com> > Subject: [cctalk] Re: reading DECtape > To:cctalk@classiccmp.org > Message-ID:<57DE7487-B3FA-4200-8D10-ACB4A5353CCE(a)gmail.com> > Content-Type: text/plain; charset=utf-8 > > If you don't find a closer alternative, I have working DECtape drives on my PDP8e (in California), as well as software that allows me to upload an entire tape image as a binary file (via Xmodem protocol). > > I'd be available to do this sometime after November 11. > > Martin > > Typing mangled by iPhone > >> On Oct 31, 2025, at 10:53 AM, Guy Fedorkow via cctalk<cctalk(a)classiccmp.org> wrote: >> >> We may have a half a dozen DECtapes, probably from the PDP-6 era, perhaps with ITS with content... >> Is there anyone, preferably in the MIT vicinity, who might have a working DECtape drive and be willing to try to read the tapes? >> >> Thanks >> /guy fedorkow >> >> >>

1 month, 1 week

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PDP-8 EAE

by Christian Corti

Can someone tell me the frequency of the R405 module in slot PF36 for the EAE of the classic PDP-8? Should it be the same as the R405 processor clock? Christian

1 month, 1 week

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"How to fix a Terak" tape?

by John Foust

I was reading my own Terak web page, and remembering that I'd read Doug Gale's history of computing at Cornell: https://ecommons.cornell.edu/bitstream/handle/1813/36810/00_TheEarlyYearsOf… and it mentions (at page 3.23) a "how to repair a Terak" video they made there, and he claims it was distributed to other universities that were also using Teraks. Has anyone ever seen this tape? - John

1 month, 1 week

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Re: MFM Hard Drive & 8" Double Side Drives

by David Gesswein

> From: Jim Davis <jim.p.davis(a)gmail.com> > Subject: [cctalk] Re: MFM Hard Drive & 8" Double Side Drives > Was anything MFM or RLL with a removible cart build in the 80's-90's? > I never heard of such a thing, Carts were scsi early 90's Syquest and > others?... > Yup https://en.wikipedia.org/wiki/SyQuest_Technology The early ones were ST412 type interface > From: Doc Shipley <doc(a)vaxen.net> > > Pretty sure Mr Gesswein is on this list but I don't see him post often. > Anyway, he designed a very handy MFM drive emulator: > > https://www.pdp8online.com/mfm/mfm.shtml > Yup but try not to hawk my board. When they say they want a drive I don't suggest alternatives. I also get the digest so most questions have been answered before I see them. Thanks all for the kind words.

1 month, 2 weeks

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The transistor invention

by Murray McCullough

I had forgotten that 75 years ago, Oct. 3, 1950, the transistor was invented leading to integrated circuits making possible personal computers and the interest of our love of computing. Where would we be without Bardeen's, Brattain's and Shockley's invention? Happy computing, Murray 🙂

1 month, 2 weeks

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Invention of the transistor

by Jeffrey Brace

> > > Message: 6 > Date: Fri, 24 Oct 2025 20:29:07 -0400 > From: Murray McCullough <c.murray.mccullough(a)gmail.com> > Subject: [cctalk] The transistor invention > > I had forgotten that 75 years ago, Oct. 3, 1950, the transistor was > invented leading to integrated circuits making possible personal computers > and the interest of our love of computing. Where would we be without > Bardeen's, Brattain's and Shockley's invention? > > Happy computing, > > Murray 🙂 > > Did you know the role of Camp Evans in the invention of the transistor? Find out here: https://youtu.be/6wFIVvb-5yQ

1 month, 2 weeks

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MFM Hard Drive & 8" Double Side Drives

by Mike Katz

I just purchased an old Gimix computer (now if only I can get it from Orlando to Chicago before my friend goes down there for Christmas). It has an OMTI 20C-1 MFM hard disk controller with a IMI 5018 19MB hard disk drive in it. I am thinking of trying to upgrade the hard drive. The Gimix System that I worked on had a half high 20MB drive and a Syquest removable 5MB drive. Does anyone have an old MFM drive laying around (half high or full height but larger than 18MB) and/or an MFM removable cartridge drive with cartridges? I am also going to try to rebuild a Vector Graphic Dual Store Dual 8" drive enclosure that I picked up at VCFMW. It suffered some dampness damage and I'm not sure the drives will come up. If you have a dual 8" drive setup (double sided drives, and enclosure) that you need a good home for, please let me know. I'm in the Chicago Area. Thanks, Mike bitwiz(a)12bitsbest.com

1 month, 2 weeks

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