- vcf-midatlantic - lists.vcfed.org

Pet Help
by David Hoelzer 28 Jun '19

28 Jun '19

Hey- My life is still in turmoil, but I decided to have a go at my PET before moving it on to a new home (yes, some of you know who I'm looking at). At this point, it is semi-conscious again... but... I appear to have a strong clock, phi1, phi2, and there appears to be data appearing on the data lines of the 6502 (see the logic analyzer output). The display, however, is not happy looking. Additionally, while the display in the photo looks awesome (compared to complete darkness), it will randomly flicker to darkness or perhaps even go dark for long periods. Nothing is particularly hot on the board, I just burned a complete set of EPROMs (and verified them), and I've been over the board three times looking for solder joints, etc. When the screen goes dark, the tube is still glowing, so I'm guessing that it's a video circuitry problem, but I'm stumped as how to tell if it's on the board or on the CRT board. (This is a 2001-N 32k..) Any suggestions? I know we have some PET pros around here. Photos attached. If they don't go to the list (I don't remember of they do) ping me and I'll send them direct. -- ---- David Hoelzer Chief of Operations Enclave Forensics, Inc.

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OT: Bob Applegate is not well
by Neil Cherry 28 Jun '19

28 Jun '19

His web site is down again but I did manage to catch a glimpse (cached) of this: Posted in Uncategorized Posted on May 29, 2019 by Bob Long term suspension of business Over the last few weeks I have been feeling weaker and eventually starting losing my breath while taking short walks. My doctor sent me to the emergency room where I was diagnosed with Leukemia. The treatment will require another 6 to 8 weeks in the hospital, so there is no way I can fill orders. I have email, but won’t be checking very often. It is unlikely any development work will take place, although my wife and kids have offered to bring things in for me to work on. Any orders placed will be cancelled until further notice and monies refunded. Bob -- Linux Home Automation Neil Cherry ncherry(a)linuxha.com http://www.linuxha.com/ Main site http://linuxha.blogspot.com/ My HA Blog Author of: Linux Smart Homes For Dummies

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Big news!!! (from me, not VCFed)
by Evan Koblentz 28 Jun '19

28 Jun '19

Hello! I have a major announcement. :) It's time for version 2.0 of my book, "Abacus to smartphone: The evolution of mobile and portable computers," which I published on dead trees four years ago. This time, it's going to be a (free!) interactive website: the era of printed books is behind us. Please help me raise funds to make this happen. Funders will get exclusive access for the first month that the website is live (approximately the whole of August 2019). All of the details (such what's new/different) are here: https://fundrazr.com/b1WZ91?ref=ab_74VRia ... please check it out. Thanks!! -Evan

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Princeton data center visit
by Evan Koblentz 28 Jun '19

28 Jun '19

Only two or three people expressed interest in seeing the Princeton U. data center, and I had a different reason to be on their campus today, so I asked for a last-minute tour and my contact their obliged. They have multiple data centers. Most of them are production IT. The one they showed me has some IT but mostly it's science: https://facilities.princeton.edu/projects/high-performance-computing-resear… I was blown away by how clean it is inside! :) It's almost mostly lights-out -- I only saw two employees during the 60-minute tour, and the lights went on/off automatically as we traversed the hallways. Pictures (personal use only): http://tinyurl.com/y2n2g4se The files called electric.jpg, standby.jpg, pipes.jpg, and overview.jpg are self-explanatory. Financial.jpg is a cage with special security for one rack that's used with credit card transactions. Super_hp.jpg is "TIGER" -- their HPE-designed supercomputer. IBM_9.jpg is their newest machine under construction. I spotted some interesting older equipment (can't say what yet) which might fit into VCF-land :), so hopefully we can make that happen. -- Evan Koblentz, executive director Vintage Computer Federation www.vcfed.org evan(a)vcfed.org (646) 546-9999 VCF is a 501(c)(3) non-profit organization

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Commodore 1541 Diagnostic Cartridge
by Jeffrey Brace 27 Jun '19

27 Jun '19

At the last workshop I had a 1541 diagnostic cartridge which a few members used. I originally heard about this from Chris Fala. If anyone wants to buy it, the this website sells it: < https://www.protovision.games/shop/product_info.php?products_id=193&languag… > -- ========================================= Jeff Brace Vice President Vintage Computer Federation

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Museum report
by Evan Koblentz 26 Jun '19

26 Jun '19

Only a few visitors today, but they were good ones, including two engineers -- one ex-HP, one ex-Bell Labs. Our museum internet access is via a hotspot (Mobile Citizen, which is $10/month exclusively for non-profits). We recently ordered a newer version of the hotspot, which arrives next Monday. But they made a mistake and deactivated our old one yesterday .... GRRRR ... so we didn't have any internet access today nor will we have it this weekend. There's a change they will reactivate the old one in the next day or two. I am skeptical but I have no way of knowing if it works until I get there and try it Saturday. I spent some time working on version 2 of our touchscreen information kiosk. This time the work is focusing on better layout/writing for the kiosk content. In version 1 I focused on getting all the right tech bits, tying up loose ends with the CSS, getting the web server running, and making sure the whole setup is rock-solid reliable.

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C64 remake?
by W2HX 26 Jun '19

26 Jun '19

? Came across this, thought it might interest some. https://youtu.be/4yOch48SScs Commodore 64

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Museum report
by Evan Koblentz 22 Jun '19

22 Jun '19

Very busy today, lots of visitors. I had three projects to work on but didn't have time for any of them -- a nice problem to have.

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Maker Faire this year
by Evan Koblentz 21 Jun '19

21 Jun '19

Everyone, This year's idea for our World (NYC) Maker Faire exhibit is replicas/workalikes. The registration opens next month, so for now this is conceptual. Me/Dean/Jeff/Corey are planning it behind-the-scenes. We will bring: - Replica 1 (Not a Mimeo, because the former is hobbyist-friendly; latter is for true aficionados) - Altair Mini - PiDP - Kim Uno - Commodore Mini - Glitchworks 8085 - Atari Flashback (maybe) Two questions: - Does anyone have Oscar's PDP-11/70, and if so are you willing to loan it to us or (better yet) exhibit it personally at the event? - What other replica hardware should we consider for this exhibit?

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FS: Various S-100 Static RAM Boards
by systems_glitch 21 Jun '19

21 Jun '19

All, I'm going through some of the extra S-100 RAM boards I've got, fixing them up, testing them, and selling them off. I started a thread on the VC Forums to corral them all together in one place, so I don't have to post multiple threads there or on the listserv. You can find them here: http://www.vcfed.org/forum/showthread.php?70379 "Tested, working" means they spent at least an hour running the Rasmussen memory test with no errors reported. Thanks, Jonathan

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FS: Alspa ACI-2 CP/M Computer with 8" Drives
by systems_glitch 20 Jun '19

20 Jun '19

All, I've decided to sell my Alspa ACI-2, here's the post on the VC Forums with full information: http://www.vcfed.org/forum/showthread.php?70364 Neat little machine, same concept as the Ampro LittleBoard Series 100 (drive box with Z80 SBC) but it uses 8" disks instead of 5.25". The CP/M CBIOS is set up to be able to read/write SSSD IBM 3740 format disks in addition to Alspa's double density format. Thanks, Jonathan

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Museum report
by Evan Koblentz 19 Jun '19

19 Jun '19

Super busy today! School's out and it showed. Several families visited today, some from the local area, and others from South Carolina and Texas. It was busy all day from 1pm-5pm. I didn't get much of a break. InfoAge management likes our new touchscreen info kiosk, so I stuck around from 5pm-8pm working on content for them.

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I know someone looking for a non-working Apple II+ Mobo
by Christian Liendo 19 Jun '19

19 Jun '19

Someone at work is looking for a non-working Apple II+ Mobo. Anyone has one that is not stripped, but not working?

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Game Changers: Inside the Video Game Wars
by Andy Meyer 19 Jun '19

19 Jun '19

I stumbled across this show on The History Channel the other night. I thought it was pretty good. What did you guys think of it? https://www.history.com/specials/game-changers-inside-the-video-game-wars/f… Cheers, Andy

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Museum Report 2019-06-16
by Jeffrey Brace 18 Jun '19

18 Jun '19

I took VCF's turn at the InfoAge front desk. About 35 visitors came to visit InfoAge despite it being a nice day and being Father's Day. All ages, some from close, some from as much an hour away. I'm not sure how many made their way to VCF, because Doug was docent at VCF today and will reply to this email with his report. -- ========================================= Jeff Brace Vice President Vintage Computer Federation

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OT: Here's my resume
by Evan Koblentz 17 Jun '19

17 Jun '19

Hey everyone. I'm not unemployed: my job situation is just stuck in a rut (not counting the awesome work I have the privilege of doing for VCF!), so I decided to expand my horizons. I had an "Ah-ha!" moment last night. I figured out that "IT communications specialist" is a real thing for which large-ish companies hire people like me. For example: new company-wide IT changes? Complicated security trends? Problems with policy documentation? Need to explain to all the non-IT people what the heck virtualization is and why they should care? And so on ... there are a million topics to keep such a person busy. Most of the time this job is burdened to a junior IT staffer who can't write, CIO who's out of touch with the masses, or HR worker who doesn't understand the technology. So, if you're on this list and you know of such a need at a big-ish company, then hire me! I'll be the guy who explains all things IT to everyone outside the department. Here is my resume. Feel free to distribute as you see fit: http://snarc.net/ek_res_comms.pdf. Thanks!! PS. Please refrain from personal commentary about my goal or off-topic replies. -- Evan Koblentz, executive director Vintage Computer Federation www.vcfed.org evan(a)vcfed.org (646) 546-9999 VCF is a 501(c)(3) non-profit organization

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Re: [vcf-midatlantic] Osborne for good home
by Dean Notarnicola 17 Jun '19

17 Jun '19

All, I just heard from him. He has not had any luck finding a qualified non-profit who wants it and it's looking to sell. Don't think he wants a ton of money for it, but it looks like he's looking for at least $100 plus shipping (which seems to be about market rate right now for a working unit.) Here's his description if anyone is interested: Osbourne 1 and all accessories including all the software available at the time and keyboard overlays for those. The only defect is that the leather carrying handle disintegrated and only the wire handle is left. As far as I know, it is in perfect working condition. I paid $1795 in 1981for the basic package (which is equivalent to $4947 today) but I purchased several add-ons in programs and keyboard overlays. I will need some remuneration. All components weigh 15 kg. On Thu, May 31, 2018 at 2:18 PM Bill Degnan via vcf-midatlantic < vcf-midatlantic(a)lists.vintagecomputerfederation.org> wrote: > For donations it comes to ship or don't ship. > > The donor finds out real quick that it will take at least an hour of time > to pack and drop off or arrange for pickup something bulky like an Osborne > portable, assuming one already has boxes and packing materials on hand. No > box or not enough padding? Boxes and packing materials cost money > especially if it's a onesy-twosy thing and the person needs to buy these > items at retail prices. Suddenly the donor is losing money because they > can only declare the value of the item, not the packing and shipping > expense nor labor. > > To file for a tax deduction one must receive and then keep track of the > donation receipt, plus accumulate enough deductions as Glenn said to make > itemizing taxes worth it. > > The donor says to himself - Why pack and ship potentially lose money? A > tax donation is great but I may not get it, certainly not right away. > Might as well just sell on Ebay. > > That's why most large donations are not shipped, even if the recipient pays > shipping, unless the recipient is willing to pay all the expenses. Or > they're rich and don't care about money. > > Bill > > On Thu, May 31, 2018 at 1:24 PM, Glenn Roberts via vcf-midatlantic < > vcf-midatlantic(a)lists.vintagecomputerfederation.org> wrote: > > > Unfortunately, the new tax law may have a negative impact on giving to > VCF > > and other 501(c)(3) org's. With the increase of the standard deduction > > threshold to $24,000 (for married couples; $12K for single filers) may be > > far fewer people able to itemize, and hence the itemized deduction for > > donation will be much less an incentive for many. > > > > > -----Original Message----- > > > From: vcf-midatlantic <vcf-midatlantic- > > > bounces(a)lists.vintagecomputerfederation.org> On Behalf Of Dave McGuire > > > via vcf-midatlantic > > > Sent: Thursday, May 31, 2018 1:10 PM > > > To: CJ Reha via vcf-midatlantic <vcf- > > > midatlantic(a)lists.vintagecomputerfederation.org> > > > Cc: Dave McGuire <mcguire(a)neurotica.com> > > > Subject: Re: [vcf-midatlantic] Osborne for good home > > > > > > > > > Unfortunately it's not an odd situation at all. The owner has > googled > > > around, figured out that people want these machines, and has seen > dollar > > > signs. It's pretty common. > > > > > > -Dave > > > > > > On 05/31/2018 12:32 PM, CJ Reha via vcf-midatlantic wrote: > > > > I've gotten a response, he says he intends to donate it to a > 501(c)(3) > > > > organization and requested paperwork. He asked how much I would pay > if > > > > I was not an organization...this is an odd situation. > > > > > > > > On Wed, May 30, 2018 at 10:31 PM, Tony Bogan via vcf-midatlantic < > > > > vcf-midatlantic(a)lists.vintagecomputerfederation.org> wrote: > > > > > > > >> I emailed him within a couple minutes of seeing Evans email. Still > no > > > >> response. > > > >> Tony > > > >> > > > >> Sent from my iPhone > > > >> > > > >>> On May 30, 2018, at 10:29 PM, Dean Notarnicola via vcf-midatlantic > < > > > >> vcf-midatlantic(a)lists.vintagecomputerfederation.org> wrote: > > > >>> > > > >>> I asked. No reply > > > >>> > > > >>> On Wed, May 30, 2018 at 10:24 PM Dave McGuire via vcf-midatlantic < > > > >>> vcf-midatlantic(a)lists.vintagecomputerfederation.org> wrote: > > > >>> > > > >>>>> On 05/30/2018 04:07 PM, Evan Koblentz via vcf-midatlantic wrote: > > > >>>>> I received an email from plebourgeois(a)me.com who said he's in > > > >>>>> Mandeville, Lousiana and has an Osborne available with > > > >>>>> accessories/manauls to a good home for the cost of shipping. He > > > >>>>> said he'll throw it away if he does not find a home for it soon. > > > >>>>> > > > >>>>> That's all I know, do not reply to me or this list, send the guy > > > >>>>> an email directly. > > > >>>> > > > >>>> It would be good to know if someone is able to save it. > > > >>>> > > > >>>> -Dave > > > >>>> > > > >>>> -- > > > >>>> Dave McGuire, AK4HZ > > > >>>> New Kensington, PA > > > >>>> > > > >> > > > > > > > > > -- > > > Dave McGuire, AK4HZ > > > New Kensington, PA > > > > >

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Old VCF East shirts needed
by Evan Koblentz 17 Jun '19

17 Jun '19

I want to hang the old festival shirts in the museum. One from each event. I have all of the East shirts except 2008 (the yellow one). Somehow I'm also missing the orange shirt from a couple of years ago. The ones I do have are all size small or medium, so I'm hoping to find those or maybe size large, but not XL or bigger so they look consistent.

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Museum report
by Evan Koblentz 15 Jun '19

15 Jun '19

Modest amount of visitors today -- it was too nice outside to visit a museum! A group of 20-somethings came in for a tour. They were smart, polite, and asked good questions. They seemed amazed by computer life before Windows and about the myth vs. reality of how Apple formed. Jimmy from the model trains group is a programmer in the day job and helped me debug the information kiosk. It wasn't always returning to the homepage after the set amount of time. Hard to fix that without seeing the kiosk program code, so he showed me how to put some Javascript into the my content pages that accomplishes the same thing. This way is better because I can customize the events that trigger idle states, the amount of idle time for each page, etc. I did some warehouse work too. Organized more of the robotics and educational/trainer kits, and disposed of a growing pile of unloved books/software (certain things that nobody took from the 'free' pile at VCF East.) Doug is docent tomorrow.

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of possible interest
by Jeffrey Jonas 15 Jun '19

15 Jun '19

Assorted things I recently discovered: ______________________________________________________________________________ http://www.pscug.org/ Pugent Sound Commodore User Group of Seattle, Washington ______________________________________________________________________________ https://www.youtube.com/watch?v=VheNpiSZxf0 Dungeon Master - Clever Floppy Disk Anti-Piracy | MVG by Modern Vintage Gamer https://www.youtube.com/user/jimako123/videos ______________________________________________________________________________ NJ video game convention http://www.avideogamecon.com/ A Video Game Con: Retro & Modern Video Game Con in NJ AVGC 2019 Sept 7-9, 2019 Parsippany NJ ______________________________________________________________________________ useful parts from an unusual source Insulated Clamps-R-Us https://www.sciplus.com/42piece-insulated-clamp-assortment-54935-p $12.95 EACH for Item Number : 95021P1 42-PIECE INSULATED CLAMP ASSORTMENT ______________________________________________________________________________ https://hothardware.com/news/commodore-amiga-revitalized-with-new-retro-har… by Marco Chiappetta - Tuesday, July 31, 2018 Commodore's Beloved Amiga Is Being Revitalized With Updated Retro Hardware -- jeff jonas

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Re: of possible interest
by Jonathan Sturges 15 Jun '19

15 Jun '19

Thanks Jeff, Some interesting bits there! -Jonathan > On Jun 15, 2019, at 12:00 PM, vcf-midatlantic-request(a)lists.vcfed.org wrote: > > Send vcf-midatlantic mailing list submissions to > vcf-midatlantic(a)lists.vcfed.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.vcfed.org/mailman/listinfo/vcf-midatlantic > or, via email, send a message with subject or body 'help' to > vcf-midatlantic-request(a)lists.vcfed.org > > You can reach the person managing the list at > vcf-midatlantic-owner(a)lists.vcfed.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of vcf-midatlantic digest..." > > > Today's Topics: > > 1. of possible interest (Jeffrey Jonas) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 15 Jun 2019 04:33:51 -0400 > From: Jeffrey Jonas <jeffrey.scott.jonas(a)gmail.com> > To: vcf-midatlantic(a)lists.vcfed.org > Subject: [vcf-midatlantic] of possible interest > Message-ID: > <CAOCNM4S9i+UDNJyCN2AKeGsB-er-LFBdwX42fJEq7hmXN5NJ1w(a)mail.gmail.com> > Content-Type: text/plain; charset="UTF-8" > > Assorted things I recently discovered: > ______________________________________________________________________________ > http://www.pscug.org/ > Pugent Sound Commodore User Group of Seattle, Washington > ______________________________________________________________________________ > https://www.youtube.com/watch?v=VheNpiSZxf0 > Dungeon Master - Clever Floppy Disk Anti-Piracy | MVG > by Modern Vintage Gamer https://www.youtube.com/user/jimako123/videos > ______________________________________________________________________________ > NJ video game convention > > http://www.avideogamecon.com/ > A Video Game Con: Retro & Modern Video Game Con in NJ > AVGC 2019 > Sept 7-9, 2019 > Parsippany NJ > ______________________________________________________________________________ > useful parts from an unusual source > > Insulated Clamps-R-Us > https://www.sciplus.com/42piece-insulated-clamp-assortment-54935-p > $12.95 EACH for Item Number : 95021P1 > 42-PIECE INSULATED CLAMP ASSORTMENT > ______________________________________________________________________________ > https://hothardware.com/news/commodore-amiga-revitalized-with-new-retro-har… > > by Marco Chiappetta - Tuesday, July 31, 2018 > Commodore's Beloved Amiga Is Being Revitalized With Updated Retro Hardware > > > -- jeff jonas > > > End of vcf-midatlantic Digest, Vol 13, Issue 14 > ***********************************************

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More history of Lego robotics
by Evan Koblentz 14 Jun '19

14 Jun '19

Although my website is about Lego robotics from before the Mindstorms era, I decided it's useful to document early Mindstorms development at MIT. So check out the new "Making 'Storms" section ... http://www.mindsbeforethestorm.com ... there are also many small update since the last time that I posted about this.

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Re: [vcf-midatlantic] Next Workshop is July 20
by Jeffrey Brace 14 Jun '19

14 Jun '19

On Wed, Jun 12, 2019 at 9:25 PM Jonathan Sturges via vcf-midatlantic < vcf-midatlantic(a)lists.vcfed.org> wrote: > Thanks Jeff!I know it could be a smaller crowd but I'm in. > It's a busy time of the year for many, but if there is a smaller crowd, then it's still good. > > > Message: 2 > Date: Wed, 12 Jun 2019 11:41:40 -0400 > From: Jeffrey Brace <jeffrey(a)vcfed.org> > To: vcf-midatlantic <vcf-midatlantic(a)lists.vcfed.org> > Subject: [vcf-midatlantic] Next Workshop is July 20 > Message-ID: > <CALWfZALKga57niENnWAE8XCMrAHAAA3Zt+6R9AzVKqFo=RCu9w(a)mail.gmail.com> > Content-Type: text/plain; charset="UTF-8" > > I?m gonna schedule the next workshop for July 20 & 21. > It will be in CDL because the ?radio guys? (NJARC) will be using 9032-A. > I won?t be there because I will be traveling to St. Louis for my Uncle?s > 90th birthday. > I will send out a link for signup soon. > > -- > ========================================= > Jeff Brace > Vice President > Vintage Computer Federation > > > > -- ========================================= Jeff Brace Vice President Vintage Computer Federation

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Off-topic / not vintage: Princeton U. data center tour
by Evan Koblentz 13 Jun '19

13 Jun '19

We've been invited for a tour of the Princeton U. data center. There is no set time; it's up to us to organize something. Is anyone interested?

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[Slightly OT] Need suggestions/ help
by laurakid 13 Jun '19

13 Jun '19

As some of you may remember me mentioning around last years Festivus, I have been overwhelmed by my (not so) current tech. I have had security issues, trouble with adjusting to and backing up/ restoring from multiple platforms and devices. I am keeping it vague to keep it short. Basically, I could use help from someone who would have the time and capability to help me regain some control over my data and create a current setup that is secure and meets my needs. I was thinking this could be a good freelance gig for a kid looking for summer work? Any suggestions on how to approach this problem are appreciated. Thanks,Laura S Reinhard 908-456-5580 Sent from Yahoo Mail for iPhone

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OT: Grub question
by Evan Koblentz 12 Jun '19

12 Jun '19

I wanted to wipe one of my spare older PCs. I used an MS-DOS boot disk and ran fdisk. That worked for zapping the partition, but it left behind Grub when I reboot. How do I delete that?

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Museum reports
by Evan Koblentz 12 Jun '19

12 Jun '19

A handful of visitors today, including one guy from Kansas and a couple who last visited a year or two ago. Between visitors, I worked on some VCF West business and also some personal projects. Steve A. came by to pick up our Digicomp 1 (our second) because he has expertise in restoring those.

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Re: [vcf-midatlantic] Next Workshop is July 20
by Jonathan Sturges 12 Jun '19

12 Jun '19

Thanks Jeff!I know it could be a smaller crowd but I'm in. Message: 2 Date: Wed, 12 Jun 2019 11:41:40 -0400 From: Jeffrey Brace <jeffrey(a)vcfed.org> To: vcf-midatlantic <vcf-midatlantic(a)lists.vcfed.org> Subject: [vcf-midatlantic] Next Workshop is July 20 Message-ID: <CALWfZALKga57niENnWAE8XCMrAHAAA3Zt+6R9AzVKqFo=RCu9w(a)mail.gmail.com> Content-Type: text/plain; charset="UTF-8" I?m gonna schedule the next workshop for July 20 & 21. It will be in CDL because the ?radio guys? (NJARC) will be using 9032-A. I won?t be there because I will be traveling to St. Louis for my Uncle?s 90th birthday. I will send out a link for signup soon. -- ========================================= Jeff Brace Vice President Vintage Computer Federation

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Re: Help identify Motorola transistor
by Sentrytv 12 Jun '19

12 Jun '19

You are welcome Mike R. Sent from: My extremely complicated, hand held electronic device. > On Jun 12, 2019, at 2:41 PM, Fred Terry <fdterry(a)verizon.net> wrote: > > Wow, that is just what I needed. I think the NTE331 NPN is the correct one so I’ll get it ordered and let you know. > > From my recollections of the individual who was working with his Persci 277, he was replacing all the tantalums. I > am doing the same. After starting my Imsai after many years of sitting, two tantalums popped on one of the boards. > The Persci is loaded with them. > > Thanks for your excellent help > Fred Terry > > >> On Jun 12, 2019, at 1:19 PM, Sentrytv <sentrytv(a)yahoo.com> wrote: >> >> See if this is correct specs >> http://www.nteinc.com/specs/300to399/pdf/nte331.pdf >> >> >> Sent from: >> My extremely complicated, hand held electronic device. >> >>> On Jun 12, 2019, at 11:52 AM, Fred Terry <fdterry(a)verizon.net> wrote: >>> >>> 1075-1 >

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Re: Help identify Motorola transistor
by Sentrytv 12 Jun '19

12 Jun '19

See if this is correct specs http://www.nteinc.com/specs/300to399/pdf/nte331.pdf Sent from: My extremely complicated, hand held electronic device. > On Jun 12, 2019, at 11:52 AM, Fred Terry <fdterry(a)verizon.net> wrote: > > 1075-1

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Re: Help identify Motorola transistor
by Jeff G 12 Jun '19

12 Jun '19

This link may help, and seems to be related to the Persci... http://deramp.com/downloads/mfe_archive/020-Disk%20Drives/PerSci/Model%2027… Transistor cross reference: ------------------------------------- http://deramp.com/downloads/mfe_archive/020-Disk%20Drives/PerSci/Model%2027… Jeff aka Bags

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Help identify Motorola transistor
by Fred Terry 12 Jun '19

12 Jun '19

My name is Fred Terry. I was a member of the VCF list a few years ago but there was an incompatibility with my verizon.net <http://verizon.net/> address and I was dropped. I am not certain of protocol so please excuse. I am trying to revive my Persci 277 but I have a bad T0220 transistor marked with the (Motorola logo) followed by 813 and having a bottom line of 1075-1. I bought the Persci new in the late 70s and have all the manuals but the bad transistor is on the power supply board for which there is no information. I remember when I joined the VCF someone was working with his Persci 277 but I have lost his name. I have registered for the August repair weekend but I live in Cockeysville, Maryland and i am facing a three hour drive. I could avoid the drive if I could get a replacement transistor. I bought my Imsai 80/30 in the late 70s along with the Persci 277, a Diablo printer and a Sol monitor. I have all the manuals and documentation for these components as well as documentation for the CP/M operating system. The Imsai is running and I hope to get the Persci operating again so I can finish the program I was writing. When finished I intend to donate what I have to the VCF Museum. Fred Terry

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Next Workshop is July 20
by Jeffrey Brace 12 Jun '19

12 Jun '19

I’m gonna schedule the next workshop for July 20 & 21. It will be in CDL because the “radio guys” (NJARC) will be using 9032-A. I won’t be there because I will be traveling to St. Louis for my Uncle’s 90th birthday. I will send out a link for signup soon. -- ========================================= Jeff Brace Vice President Vintage Computer Federation

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July workshop?
by Jeffrey Brace 11 Jun '19

11 Jun '19

There has been a request for a July workshop. If there is enough interest, then I will organize it. My feeling is that July 26 & 27 will work best. If I get at least 5 interested, then I will organize for that weekend. Reply to this e-mail if you are definitely interested. Optionally: July 6 & 7 in the usual area (9032-A) with Sandy area rooms available for overnight stay. July 13 & 14 in 9032-A, with no overnight rooms available. July 20 & 21 in the CDL space (Hackerspace) with Sandy area rooms available. -- ========================================= Jeff Brace Vice President Vintage Computer Federation

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Re: [vcf-midatlantic] I don't know if there will be a Maker Faire this year
by Ethan O'Toole 10 Jun '19

10 Jun '19

> [NON-Text Body part not included] When we ran mini makerfaires (~1500 people) we had to pay license fees based on per-attendee roughly. Maybe that expense will be shed for people doing them, but so will the resources they give you. Time will tell. The maker movement won't die. I had to quit my subscription to the magazine, it was just 3d printers over and over. And they changed the sized so they didn't match on the shelf anymore.

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Re: [vcf-midatlantic] Tube Testing - any recommendations
by Sentrytv 10 Jun '19

10 Jun '19

Hi Mike I thought I'd put my two cents in the discussion here. We have quite a few guys in our group that are "tube savvy" and could definitely help you out. First thing I would start with Is obtaining the HealthKit diagram, so you can see what's going on in the circuits. Yes you do have to worry about high voltages.! Determine what the issue is first, if you have a trace or deflection, or not, if you have correct power supply voltages or not. Having the right tools like a VTVM for a tube related to repair is absolutely necessary. A digital meter will work as long as you have one that can handle the voltages. Most likely the power supply has bad capacitors, it but that Has yet to be determined by checking the voltages in the power supply, against the schematic diagram if possible. Having some new tubes on hand and swapping them out is not a bad idea, but usually not the best way to troubleshoot. If you plan on working on more tube type equipment, a tube tester is absolutely necessary! I am available for help if needed. And bringing it to one of our workshops is probably a good idea if you're in the area. Mike R. Sent from: My extremely complicated, hand held electronic device. > On Jun 10, 2019, at 10:17 AM, mwillega via vcf-midatlantic <vcf-midatlantic(a)lists.vcfed.org> wrote: > > <mime-attachment>

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Re: [vcf-midatlantic] I don't know if there will be a Maker Faire this year
by Jeff G 10 Jun '19

10 Jun '19

Just got an announcement that the Philly Mini Maker Faire is still going on despite this, but yeah not good news either way. Here's the link to the Philly event on October 6th, 2019: https://philly.makerfaire.com/ Jeff (aka Bags)

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Re: vcf-midatlantic Digest, Vol 13, Issue 9
by Jeff G 10 Jun '19

10 Jun '19

Where are you located? I have a tube tester (several actually) Jeff (aka Bags) On Mon, Jun 10, 2019 at 12:07 PM <vcf-midatlantic-request(a)lists.vcfed.org> wrote: > Send vcf-midatlantic mailing list submissions to > vcf-midatlantic(a)lists.vcfed.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.vcfed.org/mailman/listinfo/vcf-midatlantic > or, via email, send a message with subject or body 'help' to > vcf-midatlantic-request(a)lists.vcfed.org > > You can reach the person managing the list at > vcf-midatlantic-owner(a)lists.vcfed.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of vcf-midatlantic digest..." > > > Today's Topics: > > 1. Tube Testing - any recommendations (mwillega) > 2. Re: Tube Testing - any recommendations (Evan Koblentz) > 3. Re: Tube Testing - any recommendations (Chris Fala) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 10 Jun 2019 10:17:59 -0400 > From: mwillega <mike(a)willegal.net> > To: vcf-midatlantic(a)lists.vcfed.org > Subject: Tube Testing - any recommendations > Message-ID: <EF8D7552-F12A-490D-BB87-61C0CC3BAB15(a)willegal.net> > Content-Type: text/plain; charset=utf-8 > > Hi all, > > I?m about to embark on my first restoration of a piece of tube based test > gear. It?s an old Heathkit Oscilloscope from the early 70s. I am looking > for recommendations for approaches to tube testing. Do I seek out or > build a tube tester or just test in circuit. Anything else that I should > look out for, besides the usual concerns about high voltages on the > chassis, and old degraded components. > > Regards, > Mike Willegal > > ------------------------------ > > Message: 2 > Date: Mon, 10 Jun 2019 11:09:06 -0400 > From: Evan Koblentz <evan(a)vcfed.org> > To: vcf-midatlantic <vcf-midatlantic(a)lists.vcfed.org> > Cc: mwillega <mike(a)willegal.net> > Subject: Re: [vcf-midatlantic] Tube Testing - any recommendations > Message-ID: <664e3d37-3600-19ff-36c5-2c5367ce3f9e(a)vcfed.org> > Content-Type: text/plain; charset=utf-8; format=flowed > > > > Do I seek out or build a tube tester or just test in circuit. Anything > else that I should look out for, besides the usual concerns about high > voltages on the chassis, and old degraded components. > You might want to ask the NJ Antique Radio Club. They do this all the time. > > > ------------------------------ > > Message: 3 > Date: Mon, 10 Jun 2019 11:12:23 -0400 > From: Chris Fala <chrisjpf33(a)gmail.com> > To: vcf-midatlantic <vcf-midatlantic(a)lists.vcfed.org> > Subject: Re: [vcf-midatlantic] Tube Testing - any recommendations > Message-ID: > < > CAJCHokjMnpED5NSRON3fzk8BxG5oXJD3oUkvA+iJMDa0QWZUFw(a)mail.gmail.com> > Content-Type: text/plain; charset="UTF-8" > > There is a Facebook group called Vintage Electronic Test Equipment and a > lot of the guys there post stuff about tube testers. Might be a good > resource for information > > > > . > > On Mon, Jun 10, 2019 at 10:18 AM mwillega via vcf-midatlantic < > vcf-midatlantic(a)lists.vcfed.org> wrote: > > > Hi all, > > > > I?m about to embark on my first restoration of a piece of tube based test > > gear. It?s an old Heathkit Oscilloscope from the early 70s. I am > looking > > for recommendations for approaches to tube testing. Do I seek out or > > build a tube tester or just test in circuit. Anything else that I should > > look out for, besides the usual concerns about high voltages on the > > chassis, and old degraded components. > > > > Regards, > > Mike Willegal > > > End of vcf-midatlantic Digest, Vol 13, Issue 9 > ********************************************** >

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Re: [vcf-midatlantic] Tube Testing - any recommendations
by Chris Fala 10 Jun '19

10 Jun '19

There is a Facebook group called Vintage Electronic Test Equipment and a lot of the guys there post stuff about tube testers. Might be a good resource for information . On Mon, Jun 10, 2019 at 10:18 AM mwillega via vcf-midatlantic < vcf-midatlantic(a)lists.vcfed.org> wrote: > Hi all, > > I’m about to embark on my first restoration of a piece of tube based test > gear. It’s an old Heathkit Oscilloscope from the early 70s. I am looking > for recommendations for approaches to tube testing. Do I seek out or > build a tube tester or just test in circuit. Anything else that I should > look out for, besides the usual concerns about high voltages on the > chassis, and old degraded components. > > Regards, > Mike Willegal

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Re: [vcf-midatlantic] Tube Testing - any recommendations
by Evan Koblentz 10 Jun '19

10 Jun '19

> Do I seek out or build a tube tester or just test in circuit. Anything else that I should look out for, besides the usual concerns about high voltages on the chassis, and old degraded components. You might want to ask the NJ Antique Radio Club. They do this all the time.

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Tube Testing - any recommendations
by mwillega 10 Jun '19

10 Jun '19

Hi all, I’m about to embark on my first restoration of a piece of tube based test gear. It’s an old Heathkit Oscilloscope from the early 70s. I am looking for recommendations for approaches to tube testing. Do I seek out or build a tube tester or just test in circuit. Anything else that I should look out for, besides the usual concerns about high voltages on the chassis, and old degraded components. Regards, Mike Willegal

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Museum report
by Evan Koblentz 08 Jun '19

08 Jun '19

A bunch of visitors to InfoAge today, but mostly for the military stuff because they had a D-Day 75th anniversary event. Highlight for us was a guy in his 30s who is part of the 2600/HOPE community. Between visitors I did some cleaning in the workshop + replied to VCF emails. Evan Koblentz Executive Director, Vintage Computer Federation evan(a)vcfed.org / (646) 546-9999 www.vcfed.org @vcfederation

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Festivus December 7 & 8, 2019
by Jeffrey Brace 07 Jun '19

07 Jun '19

Mark your calendars. The infamous VCFestivus party has been scheduled. Signup here: < https://docs.google.com/spreadsheets/d/1x0oSxqZXh8tmqqbUsP3KS3OywiNsEAOOmtq… > -- ========================================= Jeff Brace Vice President Vintage Computer Federation <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…> Virus-free. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campai…> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

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Re: [vcf-midatlantic] PDP-11/10 PSU Repair/Warning
by systems_glitch 07 Jun '19

07 Jun '19

Apparently some of the other DEC power supplies include a fuse on the AC input for the 5411086 board! I guess they discovered the problem in the field, too. It is a little ironic that the board that generates power fail blew up :) That's why I'd suggested the analog circuit that generates AC LO/DC LO -- both of them had gone away on the backplane. I also find it interesting that DC LO really has nothing to do with the output of the various independent regulator modules. You'd think since DC LO is open collector, each module would be able to pull it down and it'd only be released when all modules were stabilized. That is of course one of the issues with memory write-protect lockout on nonvolatile RAM on S-100: you have to wait til all three supplies stabilize, and then factor in enough time delay for each board to also have stabilized before releasing *PRESET and/or memory write lockout. I guess that's why they built a signal in for just that purpose on IEEE-696! The current draw through the connector should be 2-3 A, the combined output from the 5411086 board's +15V and +8V supplies isn't supposed to exceed 4A and is fused at 5A. It's switchmode (albeit kinda weird early switchmode, using a uA723) so current out should be less than current in, even accounting for efficiency losses. A 1A load on the +15V supply didn't register on the (granted, somewhat insensitive) power meter I was using on the AC transformer primary side. I plan to include a 0-15A AC current meter on the "actually in a box" version of my AC test supply, for finer measurement of module consumption at given loads. I've also seen various old computers and other machines with fuses bypassed, or something that's not a fuse in the fuseholder (cut off pieces of bolt or rod are common). Not a good choice! I did once see a military computer power supply with "battle fuse" switches -- the switches bypassed the power supply fuses, presumably so that you didn't lose computer power in a critical situation from a fuse breaking due to concussion from a shell hit or something. Thanks, Jonathan On Fri, Jun 7, 2019 at 11:29 AM Herb Johnson via vcf-midatlantic < vcf-midatlantic(a)lists.vcfed.org> wrote: > This caught my eye, so I looked at the schematic. Ironically, the > shorted full-wave rectifier is shown on the "power-fail" circuit > drawing. But the rectifier supplies all the unregulated DC voltage. > Unfortunately the fuse F1 is *after* the rectifier and not before. Thus > adding a fuse before the rectifier is wise. > > Bypassing the now-destroyed edge-connector pins is also wise. Did you > determine the normal AC current on those pins? I suspect a few amps, > thus those pins are at risk anyway. > > Thanks for calling this repair out. It's a cautionary tale about vintage > power supplies in general; look for AC-side fuses, install if not. I"m > looking at an IMSAI; the prior owner bypassed the AC fuse holder! ;( > > Shocked, > Herb > > > -- > Herbert R. Johnson, New Jersey in the USA > http://www.retrotechnology.com OR .net >

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PDP-11/10 PSU Repair/Warning
by Herb Johnson 07 Jun '19

07 Jun '19

This caught my eye, so I looked at the schematic. Ironically, the shorted full-wave rectifier is shown on the "power-fail" circuit drawing. But the rectifier supplies all the unregulated DC voltage. Unfortunately the fuse F1 is *after* the rectifier and not before. Thus adding a fuse before the rectifier is wise. Bypassing the now-destroyed edge-connector pins is also wise. Did you determine the normal AC current on those pins? I suspect a few amps, thus those pins are at risk anyway. Thanks for calling this repair out. It's a cautionary tale about vintage power supplies in general; look for AC-side fuses, install if not. I"m looking at an IMSAI; the prior owner bypassed the AC fuse holder! ;( Shocked, Herb -- Herbert R. Johnson, New Jersey in the USA http://www.retrotechnology.com OR .net

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PDP-11/10 PSU Repair/Warning
by systems_glitch 06 Jun '19

06 Jun '19

full writeup here: http://www.glitchwrks.com/2019/06/05/pdp1110-psu-repair I finally fixed the power supply in my PDP-11/10S, it turned out to be a shorted bridge rectifier on the 5411086 board, which provides +15 VDC, LTC, and AC LO/DC LO. Unfortunately, when it failed, the rectifier burned up the edge connector traces for the AC input to the board. I ended up cutting the edge connector traces away (what was left) and soldering on a pigtail to connect to the Mate-n-Lok coming from the AC transformer. I added a 15A inline fuse, in the repair. For those who have original 5411086s that haven't failed yet, you might want to make up a little pigtail with an inline fuse holder. It'd be easy to make up such that it could plug into the existing harness without permanent modification, and it'll save your edge connector traces if the rectifier shorts. It can happen in the other regulator modules too, but they use a Mate-n-Lok instead of an edge connector, so any damage would be repairable. Anyway, the PDP-11/10S is back up and running! Thanks, Jonathan

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Museum report
by Evan Koblentz 05 Jun '19

05 Jun '19

It was slow-ish at the museum today. Visitors included a man who last saw our exhibits a few years ago, and a family of five (three middle-school kids) who took a solid tour and asked smart questions. Wednesdays always get busy in the summer when school is out and families come to the shore on vacation. I'm looking forward to that. Docent days are more fun when there are lots of visitors.

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Re: [vcf-midatlantic] Workshop report
by Jeffrey Brace 03 Jun '19

03 Jun '19

On Mon, Jun 3, 2019 at 11:24 AM Sentrytv via vcf-midatlantic < vcf-midatlantic(a)lists.vcfed.org> wrote: > I spoke to both of them briefly. > > The boy did not seem especially interested in the Commodore 64. > He (or maybe it was his mom) was more interested in what Jeff G. was > working on and his testing procedure and programming. > > Too bad his mother doesn't want him to buy vintage computers. > > If they live locally, I would encourage them to come to the workshop more > often. > Even if it's to see what's going on there, to help and learn. Yes. They live locally in Toms River. Evan had met them at the local maker faire and told them about VCF museum. Not sure if he mentioned VCFe. The boy, Justin, was interested in a variety of machines and I got him interested in trying BASIC programming by typing in the bouncing ball program from the Commodore User’s Guide. > > By the way the barbecue and grilling was fantastic and a very good idea! > > Mike R. > > Sent from: > My extremely complicated, hand held electronic device. > > > On Jun 3, 2019, at 11:14 AM, Jeff Galinat via vcf-midatlantic < > vcf-midatlantic(a)lists.vcfed.org> wrote: > > > > Hi Jeff, > > The young man’s name is Justin and I am pretty sure his mom’s name is > Tracy. Since he seemed pretty interested I told them all about VCFE which > they did not know about. > > Jeff Galinat > > > > Sent from my iPhone > > > >> On Jun 3, 2019, at 10:56 AM, Jeffrey Brace via vcf-midatlantic < > vcf-midatlantic(a)lists.vcfed.org> wrote: > >> > >> One kid about 12 years old visited the museum and was highly interested > in > >> vintage computers. He knew many things which he learned from YouTube. > Some > >> accurate, some not. His mom said that he was bored from modern scratch > >> programming. I had him try out BASIC programming on the C64. He wants > to > >> buy vintage computers, but his mom won’t let him. He also checked out > the > >> repair workshop. He really enjoyed! > >> > >> ========================================= > >> Jeff Brace > >> Vice President > >> Vintage Computer Federation > > -- ========================================= Jeff Brace Vice President Vintage Computer Federation

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Warehouse helpers needed
by Evan Koblentz 03 Jun '19

03 Jun '19

Everyone, We need a lot of help in the warehouse this summer. The work is mostly sorting and organizing, under my direction. There is some, but not a lot, of heavy lifting involved. What's in it for you: glory, lunch, and a sense of accomplishment. We need people who can give us a full day at a time. Wednesdays are best. Weekends are also possible. What's good: planning ahead for specific days. What's not so good: last-minute changes, unreliable people, inability to follow our guidelines/policies. Apply directly to me via evan(a)vcfed.org. -- Evan Koblentz, executive director Vintage Computer Federation www.vcfed.org evan(a)vcfed.org (646) 546-9999 VCF is a 501(c)(3) non-profit organization

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Tanday Assembly comments
by Mike Loewen 03 Jun '19

03 Jun '19

I'm thinking about exhibiting at the Tandy Assembly in September. For those of you who attended last year, how did you like it? Mike Loewen mloewen(a)cpumagic.scol.pa.us Old Technology http://q7.neurotica.com/Oldtech/

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