May 2023 - vcf-midatlantic - lists.vcfed.org

August Repair Workshop & InfoAge Volunteer Cookout
by Jeffrey Brace 25 May '23

25 May '23

The August repair workshop will be August 26 & 27. Signup is here: https://docs.google.com/spreadsheets/d/1fWMqLQ_8wqgUHlUJMqLlH84z3CPpOzc2Tb-… There is a volunteer cookout run by InfoAge for all the volunteers on August 26. So we are invited. I need a count of who is coming, so please sign up on the Repair Workshop list to let me know that you are coming. Likely it will be burgers, hot dogs, soft drinks. There is no cost to volunteers. Volunteers and their families will be coming. Probably it will be around 6PM, but details will be forthcoming. Thanks! Jeff Brace VCF National Board Member Chairman & Vice President Vintage Computer Festival East Showrunner VCF Mid-Atlantic Event Manager Vintage Computer Federation is a 501c3 charity https://vcfed.org/ <http://www.vcfed.org/> jeffrey(a)vcfed.org

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Usagi Electric (Dave Lovett) visits Computer Museum @ System Source (20 Minute Video)
by rar 25 May '23

25 May '23

YouTube creator, David Lovett, (Usagi Electric) was here in Baltimore last week and filmed some of the highlights of the museum. He chose a few items that we rarely talk about in addition the items we usually show. https://www.youtube.com/watch?v=iqiFOkJ_Kbg We are shipping him one of our Bendix G-15s for him to restore. Can't Wait! Bob Roswell https://museum@syssrc.com 410-952-9140

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Speaking of youtube videos - my museum vid.
by Dave Shevett 25 May '23

25 May '23

Finally edited this together - a tour of the museum when I was down there for VCF east. https://youtu.be/qCDxU6aJC3U -- Dave Shevett shevett(a)pobox.com

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I tube, you-tube, we all tube for ...
by Jeffrey Jonas 25 May '23

25 May '23

Just making sure everyone knows of 1) Bill Mauchly's videos https://www.youtube.com/@BillMauchly/videos 2) The wonderful followup to "The Secret Life Of Machines" is the 'Secret life of Components' https://www.youtube.com/@timhunkin1/videos This channel is about Tim Hunkin's work. It includes his TV work, arcade machines, public clocks and his recent youtube 'Secret life of Components' videos. 3) for purely mechanical devices, see Brad Litwin https://www.youtube.com/@BLitwin/videos http://www.bradlitwin.com/ These are the works of Bradley N. Litwin, kinetic sculptor, musician, self-made madman. Here, you will find all kinds of mechanical stuff, ranging from the miniscule to pieces that fill a proscenium stage. And, Brad is the inventor and maker of MechaniCards, an affordable collection of "mechanundras," designed to be mailed, presented as unusual gifts, or just zoning out, while playing with them, on your coffee table. and so much more! -- jeff jonas

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First TV Show Home Computer?
by Douglas Crawford 22 May '23

22 May '23

(Computer in the home) Munsters beat out Batman?! Claimed to be a UNIVAC https://youtu.be/aa2nCVke2XY?t=219

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Re: [vcf-midatlantic] Ohio Scientific 440 Video Board
by Bill Degnan 22 May '23

22 May '23

I almost surely have schematics and specs for all of this. What should I look for to assist? Or stop by at your convenience. I have reorganized the OSI stuff to make it easier to use and I have been planning to explore the 400 series stuff. Bill On Mon, May 22, 2023, 8:02 PM Alexander Pierson via vcf-midatlantic < vcf-midatlantic(a)lists.vcfed.org> wrote: > Bill & Bill, > Mr. Degnan, I had seen your 400 board photo on vintagecomputer.net, which > I used as a reference during the construction of my replica from > glitchworks (which is now running!), but I had not seen the rest of the > image set including the 440. That will be helpful as a reference, as I've > only found photos of 4 other units out there. Seems yours has the last two > RAM sockets populated for color. > > > The documents for both the 440 and 420c available online from osiweb & > Mark's OSI archive are ones provided by Mr. Dromgoole himself, so thank you > for having uploaded those -- without them, I'd be up a creek. Also, good > to know about Mike's ASCII keyboard adapter. > > > I've also come across what might be an example of an original Challenger > with a 440 and a 420c on DigiBarn's page. They're the cards farthest from > the nameplate. > https://www.digibarn.com/collections/systems/challenger/page_01.htm > > I wish attending a workshop was in the cards for me, but the distance/time > tends to clash with my work schedule. > > > Thank you, > -Alexander 'Z' Pierson > On Monday, May 22, 2023 at 01:41:05 PM EDT, Bill Degnan via > vcf-midatlantic <vcf-midatlantic(a)lists.vcfed.org> wrote: > > Maybe I will bring my osi 400 stuff to the upcoming vcfed workshop, If I > can go and have coverage at the museum then > B > > On Mon, May 22, 2023, 12:43 PM Bill Dromgoole via vcf-midatlantic < > vcf-midatlantic(a)lists.vcfed.org> wrote: > > > You just need an ascii keyboard with TTL level outputs for the 440 video > > board. > > The input is enabled for one micro second every five milliseconds by the > > OSI 65V ROM. > > This means you need a keyboard strobe pulse about 10 milliseconds long > for > > it to work. > > You can use M. Willigals PC keyboard to apple 1 adapter board for testing > > purposes if you want. > > The early version only had a pulse width of 125 microseconds though. > > I had to use a 74ls123 with a 15K resistor and a 1.1 microfarad capacitor > > between the adapter and the 440 to get the correct pulse width. > > > > He no longer sells the board but can build your own. > > http://www.willegal.net/appleii/appleii-kb-int.htm > > > > Bill > > From: Alexander Pierson via vcf-midatlantic > > Sent: Monday, May 22, 2023 9:37 AM > > To: vcf-midatlantic(a)lists.vcfed.org > > Cc: Alexander Pierson > > Subject: [vcf-midatlantic] Ohio Scientific 440 Video Board > > > > > >

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Re: [vcf-midatlantic] Ohio Scientific 440 Video Board
by Bill Dromgoole 22 May '23

22 May '23

You just need an ascii keyboard with TTL level outputs for the 440 video board. The input is enabled for one micro second every five milliseconds by the OSI 65V ROM. This means you need a keyboard strobe pulse about 10 milliseconds long for it to work. You can use M. Willigals PC keyboard to apple 1 adapter board for testing purposes if you want. The early version only had a pulse width of 125 microseconds though. I had to use a 74ls123 with a 15K resistor and a 1.1 microfarad capacitor between the adapter and the 440 to get the correct pulse width. He no longer sells the board but can build your own. http://www.willegal.net/appleii/appleii-kb-int.htm Bill From: Alexander Pierson via vcf-midatlantic Sent: Monday, May 22, 2023 9:37 AM To: vcf-midatlantic(a)lists.vcfed.org Cc: Alexander Pierson Subject: [vcf-midatlantic] Ohio Scientific 440 Video Board

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August Repair Workshop Rescheduled to August 26 & 27
by Jeffrey Brace 22 May '23

22 May '23

Unfortunately a gremlin deleted our reservation for the August repair workshop back in January. Some other group has since reserved for our originally scheduled weekend. So the new date is August 26 & 27. *Signup for August*: https://docs.google.com/spreadsheets/d/1fWMqLQ_8wqgUHlUJMqLlH84z3CPpOzc2Tb-… *Other dates for Repair Workshops:* *Signup for June*: https://docs.google.com/spreadsheets/d/1Y17roR2xP75sq5kjbv8jcVPk-a3vCVjWdmT… *Signup for July:* https://docs.google.com/spreadsheets/d/1TJJxdL8skd7giR1miP-5AKMHwoBSqU7gse-… *Signup for October*: https://docs.google.com/spreadsheets/d/1skx8EEXuJl2fUdNGrDIeJO8eekSQQI-ciyT… *Signup for November*: https://docs.google.com/spreadsheets/d/1gcb3OQ60zfuZpNcXkqi-rUwvlVeYLZF4t1s… Thanks! Jeff Brace VCF National Board Member Chairman & Vice President Vintage Computer Festival East Showrunner VCF Mid-Atlantic Event Manager Vintage Computer Federation is a 501c3 charity https://vcfed.org/ <http://www.vcfed.org/> jeffrey(a)vcfed.org

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Any DEC-ies coming to the June 10th workshop?
by Dave Shevett 22 May '23

22 May '23

Would love to have someone checking over my shoulder and take a look at my /73 that won't boot. I tossed my name and info on the spreadsheet. -d -- Dave Shevett shevett(a)pobox.com

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VCF PDP-8 pictures
by David Gesswein 22 May '23

22 May '23

Finally got pages online about my VCF exhibit. The pictures the PDP-8 took. http://www.pdp8online.com/shows/vcfe23/pics2.shtml And top page for exhibit. http://www.pdp8online.com/shows/vcfe23/index.shtml

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