Liberty Electronics: Freedom 100 Terminal Repair
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- เผยแพร่เมื่อ 2 ต.ค. 2024
- Let's take a look at the Liberty Model Number BT1200A serial terminal. I have no idea if this terminal works, so let's power it up and do a little fault finding.
-- Video Links
Motherboard photos and ROM dumps for this terminal:
archive.org/de...
Freedom 100 Manual:
www.bitsavers.o...
Photo of a "new old stock" Freedom 100:
i.redd.it/tcsz...
Rebadged Freedom 100 used as the display/keyboard for the Morrow MD-3:
dunfield.classi...
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Deoxit D5:
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O-Ring Pick Set: (I use these to lift chips off boards)
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Elenco Electronics LP-560 Logic Probe:
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Hakko FR301 Desoldering Iron:
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Rigol DS1054Z Four Channel Oscilloscope:
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Head Worn Magnifying Goggles / Dual Lens Flip-In Head Magnifier:
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TL866II Plus Chip Tester and EPROM programmer: (The MiniPro)
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www.aliexpress...
TS100 Soldering Iron:
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EEVBlog 121GW Multimeter:
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DSLogic Basic Logic Analyzer:
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Magnetic Screw Holder:
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Universal ZIP sockets: (clones, used on my ZIF-64 test machine)
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RetroTink 2X Upconverter: (to hook up something like a C64 to HDMI)
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Plato (Clone) Side Cutters: (order five)
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Heat Sinks:
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Little squeezy bottles: (available elsewhere too)
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--- Links
My GitHub repository:
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Commodore Computer Club / Vancouver, WA - Portland, OR - PDX Commodore Users Group
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--- Instructional videos
My video on damage-free chip removal:
• How to remove chips wi...
--- Music
Intro music and other tracks by:
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Seems clear to me that the CRT was left unused for too long and all the photons settled at the bottom of the screen, it just took a while for them to get stirred back up.
Do you mean the phosphor? Photons are always moving
@@amirpourghoureiyan1637 Nope definitely photons. 😉 Fortunately, Adrian didn't tip this on its side, otherwise the electrons would've fallen out. 😁
@@thomasbonse I see you are a man of culture!
@@RetroJack I rarely make jokes, but when I do, I only make bad ones. 😳
The pixies had forgotten why they were angry. They needed to be reminded.
Linux has a terminfo entry for this terminal.
export TERM="freedom100"
This bring me memories if a time when i connected an IBM terminal with spanish language cartridge to a pc with redhat, but terminfo had no definition for the cartridge extended chars, having to compile with an specific program for terminfo to get a new definition...
At 30:26 (among other places) you can see on his monitor that he's cd'd into /usr/lib/terminfo. He was trying to figure it out. Maybe the Raspberry Pi OS he was running has a stripped-down terminfo database?
@@wbfaulk yeah, he needs to install ncurses-term.
I think the Unix terminfo database pretty much has everything.
Every scuba-diver knows of the legend and pionier of Jacques-Yves Cousteau.
Well said! I'm not a scuba-diver but I love documentaries and grew up watching and reading of him.
You mispelt Jacques custodian
@@c0olcast me too. Love it
@@briansouth9325 And you misspelled misspelled…
John Denver wrote him a love song! Well his ship Calypso actually, but details.
Adrian: get a mirror so you can see what the screen is showing while you working at the back of the CRT. Any tv technician have one on the workshop. Is a must have.
What do you want to bet that he will receive several in the next couple of Mail Call Videos.
@@cee128d yeah, people are so generous to adrian. a big success on his side.
@@proCaylak Not just Adrian. I see that with a lot of the Retro computer and the Car Revival TH-camrs .
Haha it will happen lol
Those stems can be 3d printed. I have some if you are interested
Further evidence for the Jacques Cousteau link is that the sticker says "Calypso" which was the name of his ship.
I noticed that too.
Definitely is.
And a swimming figure as its logo :)
I had one of those stickers as a kid, circa late 70s/early 80s. I think the Cousteau society was sending them out in donation solicitations.
@@Grinder2112 oh you may be right here
Thank you !
Classic capacitor reforming in the end, and the terminal looks amazing. As for the stems, 3D printing is probably your best bet, using one of the good switches as a model. I believe Tech Tangents did something like that for his HP86...?
I love these old terminals --- they're so satisfying to use. One thing you can do with them these days is to mount a Raspberry Pi or similar SBC actually inside the case, powered off the internal 5V supply, and then hook it up to the serial port, for a completely non-destructive sleeper Unix system.
Regarding the keycaps: you don't need to replace the switch, only the plungers. You might be able to 3D print a new plunger, although the tolerances could be too tight. If that fails, I bet you could 3D print an adapter part with connects to the broken plunger.
The labels are always jacked up because an asset tag was slapped there, and removed when decommissioned (stolen - heh).
@Robert F Film crews that need props?
@Robert F :) No idea. Same person who steals yogurt from the fridge :)
@Robert F People are stupid. I once watched someone try to get online (at a public library) using a microfiche reader. Shockingly, the absence of a keyboard did not stop him.
The sticky stuff under the anode cap is dielectric grease/HV insulation grease and is meant to be there. Without it, you can end up with the anode arcing out from under the cap if you get a dust buildup in the vicinity of the cap.
If you can CAD up replacement stems I can print them for you on an SLA printer, like I did for akbkuku.
He's got a SLA printer... I found this already CADed : www.thingiverse.com/thing:4556405
@@redace001 I don't believe he does? Anyway, those are too long.
@@skonkfactory Easy to adjust the model if they are. 😎👌
Cheers Adrian, relating to your sticker: The RV Calypso is a research vessel for the oceanographic researcher Jacques Cousteau, equipped with a mobile laboratory for underwater field research. The ship is named after the Greek mythological figure Calypso :-).
Stems? 3D printing to the rescue! :)
I was going to say the same thing. Should be relatively easy to model them and print them. Just need one of the good ones for reference.
It would also be possible to make a new set of stems that have Cherry MX mounts on top, if he wants to use a modern but retro-looking set of keys.
@@mal2ksc Whoa... neat idea. Now the ol' brain bucket is whirring with possibilities!
@@mal2ksc modern Dasher or Dancer SA caps perhaps… if he has a set I guess
@@kaitlyn__L The character set probably wouldn't line up. I would imagine that any key set would have to be made specifically for a terminal -- maybe _this particular_ terminal. But someone may still have already done it.
You have the right age, Adrien
We all saw those underwater documentaries and adventures off Jaques Cousteau and his ship the Calypso in the late 70'ties early 80 'ties when we were children.
No internet or Wiki then.
I remember those very well 😀
I had a window decal like that in the 70s
Adrian:
i got 2 channels so i don't have too much time to make video's.
Me:
really ? it's like he is making 4 time's more. than before :-)
Word’s that’s end’s with’s S’s don’t’s all’s get’s apostrophe’s.
@@Adam-McG i'm German so i don't know nor do i care :-)
@@WilliamAndrewPhilipBodie You should care.
Definitely bad or old caps. They got some life back in em after being powered on again. It'll probably work fine for a while as long as you keep it on and running it. But you will need to replace them eventually.
Yeah, watching enough shango066 has taught me a lot about how vintage* caps can reform, but I've never seen "modern" electrolytics do that
(Edited to correct my statement)
@@lauram5905 Shango's the man. Even modern electrolytic caps can "reform" though they won't last. He usually resurrects them for short term use. If you intend to keep and use these, recap and reflow all solder joints.
@@tiporari I could do without Shango's nutty conspiracy theories, and the fact that he NEVER cleans anything and just leaves dirt and mouse crap on electronics.
@@ct92404 You must not have worked on electronics in an industrial setting. If you think mouse turd is an issue, you'd die if you got to see some of the stuff I have had to work on over the years. No one gives a crap what the components look like when in use. As long as the gear is working, that is all that they care about.
@@tim_buck_too9126 When you're "restoring" vintage electronics, it matters. Oh yeah, that's right Shango calls it a "resurrection" to try to cover up for how he does a half-ass job with everything. It's sloppy, lazy, and pathetic. And that's not to mention his bullcrap conspiracy theories he rambles about all the time.
Most of the CRT's that Adrian pulls apart looks like a scary nightmare on the inside, but this one looks very pretty, I must say. I like it. :)
Check for a 2.2 - 4.7uf non-polarized cap in the vert. output for high ESR. They go bad frequently and cause some of the same symptoms you are seeing.
Great tip!
Those exact key switches can be found on Apple IIe keyboards. Those long stems you have are actually uncommon. The white switches are used on large keys like shift, but you can use a black switch without issue.
Y not use a dremel to shave the long stems ... that should work; I'd think.
3d print some stems or epoxy mold them! Come on now!
The CRT must have really Rubbed Out to make everything so sticky :P
How rude..
.
.
.
.
.
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What ya doin later....lol
Well, what else was it supposed to do? It was practically in solitary for years.
I see what you did there. ;-)
Haha! In my opinion, all keyboards should have a "rub out" button!
A gangster terminal ;)
They all do, but the British English to American English translation is "backspace", but i think it is delete on this one :P
@@frozendude707 There is also a "BACK SPACE" key. So RUB OUT must do something different.
@@mal2ksc Yeah, on most keyboards with that working it seems to be the same as backspace or whiteout, but not here, delete would be my guess.
@@kaizenneko725 If you had a _nice_ typewriter, it would switch to a white ribbon and then type the same character you're rubbing out.
I wouldn't be much surprised, if "Freedom 100" mode was VT100 emulation (less license).
Not even close. (I checked.)
@@knghtbrd Thanks for checking and coming back on this. (However, it would have been quite a marketing move.)
Usually those vertical hybrid IC:s have critical capacitors near them, just like in many integrated audio amplifiers. When those go out, the amplifier starts to have weird issues. I think it just had been sitting so long that those capacitors needed a bit time to reform, there is (usually) nothing else that can go out (except dirty pots) that does not result in complete vertical collapse.
I love how simplistic these old terminals are, if you can find service manual you can understand them completely, and even without it they are pretty easy to work with.
You can’t reform these types of caps. (Where has that come from btw?)
As mentioned to someone else, you’ll find it’s likely just oxidisation on the scan coils plug etc... the problem presented itself as a frame/vertical collapse, which is what it was, but with an odd wrap around issue. This could’ve been because the brightness was too high! I’ve seen it happen
@@The_Studioworkshop Reforming may be a bit wrong word, but in aluminium electrolyte caps thin oxide layer on electrode can broke down that causes capacitor to go electrically leaky. When power is applied oxygen is generated when water in electrolyte breaks down, and that somewhat self-heals the cap (also increasing the pressure and causing physical leaks), but that does not make it magically new. They are bad and dried and should be replaced none the less.
When the monitors were made they used a high voltage Silicone grease on and around the anode cap to reduce the high voltage tracking across the glass.
I have seen that in a few cases too where the manufacturer use silicone grease around the anode cap, but I have also seen those caps deteriorate on some New Old stock flybacks. Some plastic just gets that sticky as it gets older. I have some older RCA branded monster like speaker cable that the plastic insulation is deteriorating in the exact same way. It is also causing the copper cable inside to turn green!
Just sounds like a silicon based dielectric grease, you can pick it up at Menards and Lowe's for under $10, cheaper if you can find the smaller tubes, then under $5.
I'd advise against WD40 with rubber. It's mineral oil content might dissolve natural rubber. Silicone Spray might be better (but since it's sticky that might already be on there).
14:57 that's right ; in many service manuals (apple all-in-one CRT models for instance) it clearly states that if you're going to put away the open CRT you must loop the anode and cathode with a cable to prevent charge re-build
Cousteau and Calypso in one statement?
It's definitely that Cousteau.
The first place I worked at (British Rail (or at least its successor), the source of your Local Systems Arche/Vixen motherboards) had several of these dumb terminals (different brand but very similar right down to the CRT stand) dotted around, tied via ISDN modems to the mainframes, and were used if the WAN failed and the SNA terminal emulation software was thus unavailable, to allow developers access in for emergency maintenance etc, as late as 2005 (its possible they're still around today!) . They were getting very long in the tooth by then, having been in service for well over 20 years.
Probably best to switch it to ADM3A emulation as termcap/terminfo should have that as standard (assuming that the Linux people haven't removed the definitions).
Re: Cousteau Institute, that's Jaques Cousteau, the famous under water explorer who made lots of films in the 1970s. His ship was called Callypso. John Denver wrote a song about it.
The sticky stuff is PLASTICIZER, used to soften certain plastics. The shroud of the HV connector is a typical example of that softened plastic.
You might be able to fix those keyswitches by drilling a small hole down the centre of the cross on both sections and pressing in a stainless steel pin. Then glue the 2 halves back together, the pin should reinforce the joint and make it strong enough.
A short (5-8mm) length of paperclip wire would do the trick.
Hey Adrian,
Nice video. Love the old school terminal!
The sticky goo on the anode cap is dielectric grease (which may have gone bad after nearly 40 years ;-) ). It put there to to avoid HV arcing due to dust and moisture ;-)
Some terminals depending on the option will an echo for typing. I used similar terminals to talk to DMS-100 telephone switch and datageneral mainframes. It does take me back. As always great video
I thought you secretly sprayed some Deoxit into the adjustment pots to clear that up. :-)
This is really cool. I love seeing vintage terminals connected to Linux computers!
I love all these old terminals. I especially love the idea that you could quite easily hook something like this into any of the world's fastest supercomputers right now and meaningfully control whatever protein folding or deep learning they're running.
Device was sitting for 25-30+ years. The capacitors lost their "forming", the aluminum oxide coating on the plates inside the cap. Usually the caps will reform in the matter of seconds, but if a cap is connected to a power supply rail though a resistor (like 100K or more), it will sometimes take even long time to reform it. To check if reforming was successful, leave the device turned off for about a month, then turn it back on and see if there is again problem at power on :)
I have a Commodore 1902 monitor that a friend gave me that hadn’t been used in a couple decades. When I got it, vertical deflection was a mess. The screen couldn’t be expanded past about the middle 1/4 of the screen with lots of distortion, but as an experiment, I powered it on for a couple hours a day for about a week. Eventually vertical deflection returned to normal and has been fine ever since.
It's surely a VT100 clone. I so want a decent serial terminal for my Sun server! Soon!
I immediately thought of VT100 too. At the university I attended, I always entered vt100 for the terminal emulation question when logging into my Solaris account. We had a bunch of Sun IPXs and IPCs. I hated the IPCs (slow as molasses).
The computer science department had some Sparc 1s, 2s, a 5, and a 10. Someone had a Sparc 20 in his office.
We were in Heaven when we got an UltraSparc 1. We even had an Enterprise 4000 server. :)
@@DerekWitt I found some docs and yes, they are standard VT clones. There was also a Liberty 212 VT220 clone. Of course it doesn't have the DEC keyboard markings but I'm sure the real DEC heads didn't need those. There were standard emulations on the back too. I had a real VT320 at one point and I miss that thing more than any other ancient hardware I ever possessed. Still looking for a replacement. BTW these things were expensive! $500 in then-money.
Terminals turn up in estate sales sometimes. Watch estatesales.net for sales in your local area and look for sales that have what looks like a home office with a lot of computer manuals and disks in it. I'm starting to see more estates of IT pros from the 80s and 90s turn up and they often had a terminal at home. Sometimes the terminal ends up in the basement.
It is a vt100 clone. We bought all DEC stuff at my university and vt100's at the time were something like $1200. When these came out, they were listed at $600. I got a few in my lab at an introductory price of $400. Functionally, they were identical to a VT100 and had a few neat modes standard vt100s did not have, e.g. it could show non-printing ASCII characters. Of the two units in my lab, one developed a weird PS problem where it wasn't supplying enough current on the 5v rail and the system would lock up. As a quick fix we paralleled another 5vdc supply and it worked fine. Never did go back to troubleshoot the PS. I still have one in my home lab, e.g. basement connected to my PDP11. BTW, Bitsavers has the User manual and troubleshooting guide if you need it.
A better title would have been: Freedom: the self repairing terminal
@Adrian -- I bet my pal Thomas aka Chyrosran22 here on YT (and many other places) would have a switch or two for you! I sold him the IBM Model M13 in his video review of that keyboard, and I still have its twin... I'll send him a Tweet.
Often the linearity fault is down to a duff capacitor, as others have mentioned. Often too, this is a 3.3uF or 4.7uF or thereabouts, Bipolar electrolytic cap that looks like an ordinary electrolytic. Be careful if this is the case and you choose to replace it. A non bipolar cap will work for just long enough to get the lid back on before it pops, ususaly very loudly.
Also.. stem on replacement keys is too long?! Can you not file it down to the required length?
"Liberty" and "freedom," immediately calls to mind everything that's wrong with America.
I'd put my money on a bad capacitor. Often they don't show problems until you put them under load, especially high voltage caps.
Yep. Now when I hear somebody say "freedom," I assume it means "from democracy and other races / religions / cultures / lifestyles."
@@nickwallette6201 It's because of all the sheer idiocy that's sprouted from the woodwork the past few years, especially in the light of the pandemic, that I've taken to spelling "freedom" with a "B." People complaining that social distancing, mask requirements, and other restrictions are somehow an infringement on their freedumbs. As if the virus cares about their rights.
In the old company we had terminals for the warehouse. The whole picture was built up with ASCII characters. Press 1 to put things in storage. Press 2 to get something from the warehouse. Press 3 to search for something. Press 4 to get inventory. Press 0 up one menu. Tab, Tab, Enter. It was all very easy.
Because there are no longer any real terminals, we ended up with Linux computers and laptops with terminal emulation. In the office there was the server where all data was stored and the backups were made.
So it was still accessing the back-end via text mode interface but just using emulators. Funny. There is something to be said about how quickly you can move around in a text interface. Just requires a steeper learning curve.
@@adriansdigitalbasement2 I’ve also seen a lot of POS terminals just running a terminal emulator too, hooking up to the same store inventory etc as in the 80s and 90s :) but on much newer hardware! This stuff seems to be more common than anticipated in various sectors
This kind of ASCII mode interface is still used in some big rental car chains and airline checkins. Users connect with windows based terminal emulators to the server.
I want to say 1 thing : MURICA, FUCK YEAH!
also 420th comment haha funny (bruh)
Its Jaques Cousteau, the inventor of SCUBA and the films films we watched as a kid on PBS about the ocean. It doesnt appear thats their current address anymore, but they still have a 757 area code on their website. So either they are still in the area. Strange, you keep picking asking about places near where I live. Long ago when you were reviewing light bulbs, you asked about an address in Chesapeake, which was the corporate headquarters for Dollar Tree.
That terminal is the perfect main control for Liberty Prime from Fallout. Needs a Robco Termlink simulator. :)
Fallout computer 💻 from the game.
I feel short-changed on how you got the raspberry pi to 'talk' to the terminal through the serial port. Is there a linux command which pipes console I/O through serial? And how does serial comms work through USB? Did the connector cable have 25 pins, or did you have to attach a 9-pin to 25-pin adapter? I'd likt to have seen a little on that.
Thanks for this video, nonetheless. I love old dislplay hardware like this.
The Calypso was Jacques Cousteau’s team exploration boat.
If modern keyboards had a rub out-button, you know exactly what it would be used for. xD
This is how it should be. Things fix themselves. That's a tough skill to teach, Adrian. But I think you've made some headway. :)
Plug the keyboard into the telephone jack in your house to control your house
I'd like to see it turned on again later to see if the termnal's "self-healing" repair maintained itself...
Iirc that goo is a dielectric grease to keep the high tension from arcing to the tube coating. I always put new on if the old is too goopy and/or has migrated away from where it's supposed to be.
Custeau made documentaries about the ocean, the marine biology, that kind of stuff. His boat was called "the calypso".
what I don't have a clue is what is that thing and what can you do with it. at first I thought it was going to be a not-PC computer, like a Tandy, Adam, or the british one. I'll have to google what it is.
It’s a terminal, it receives plain text from another computer and displays it. Later existed “graphics terminals” but this isn’t one of those. You could plug it into a Raspberry Pi or a modern desktop with the right software options set up and access their text mode command line (like Cmd in Windows or TTY/Terminal Emulator in *nix). Those windows with text inside are emulating a terminal like this, and that’s all this can do. LGR has a video on a DEC terminal from a couple years ago too. Old terminals are fascinating!
aww 4th of July video and no exploding caps lol
Happy July the 4th! I'm excited to see that you have "repaired" this. I really appreciate your comments. I have this exact terminal and just repaired mine last month. The vertical linearity was off, the top 4 lines of text were off the top of the screen and the bottom half looked just fine. After extensively investigating every electrolytic capacitor for high ESR, all caps checked out good. I wasn't expecting that. I read the maintenance manual for advice on how to fix this. No good advice in the manual. All I did, was to "recalibrate" the pots at the top of the video board. The maintenance manual does not even mention these pots, or what they do. My terminal is working fine now.
That is High Voltage Grease on the HV lead on the CRT..
32:26 Channeling Eric. Awesome
Thanks for the nice video, Adrian! I often watch your videos while doing some repair/restoration too :) The issue with vertical deflection is more likely because of the "tired" caps. The deflection current has sawtooth waveform in normal. Looks like the power rail was unable to supply enough current in the end of deflection current ramp, and we got that "rollover". Also I noticed that bad caps have tendency of temporary "self-repair" because of warm-up. Sometimes I use that fact to check them by heating with a soldering iron or a fan and watch if the device behavior changes.
I still keep my RS232 Breakout box in my networking tool bucket. Haven't used in over 10 years though!
Janky electrolytic capacitors on the analog board, they need to be changed, otherwise the problem will comeback 😋
Absolutely right, it will come back, there's still a problem and its likely temperature related.
Morrow had a version of this terminal for their MD3 computer system. Exact same terminal with their own badge. Been looking for one forever.. just have the computer and keyboard.
> Freedom 100 Terminal by Liberty Electronics
> Posted 4th July
Freedom from English tyrants, so we can install our _own_ tyrants! 🎇🎆💥
LIBERTY and FREEDOM on July 4th! Thank you, Adrian!
Maybe the caps reformed themselves
How did you hook it up to the raspberry pi?
The Cousteau Society is a marine life protection organization
Named after the leggendary Jacques Cousteau
Muh freedoms at 9600 baud
Interesting that this uses "rub out"... That's the same terminology Sinclair used on his early machines, and I've heard it said that this was very "British".
Yeah, since erasers are called rubbers often. Eraser is really more of an Americanism, even though of course “to erase” is in our vocabulary. So when working in pencil you’d “rub out” mistakes on paper. The metaphor got transferred over. I don’t know if any typewriters said it though…
@@kaitlyn__L Yup, I certainly understand the reference (I'm from the UK myself), I just find it interesting that it would be used on an American appliance (I hesitate to call this thing a "computer" 🙂).
W-w-wait! I like liberty and freedom I swear I swear!! And I'll prove it!! *smashes like rapidly*
Japanese (Kana character) support?! I'd like to get one of these!
Japanese-supported terminal are rare in Japan... (They are usually discarded as useless.)
27:00 - Vertical Hold and Vertical Linearity interact with each other!
You started out saying 68 Thousand but then immediately afterwards corrected for 68 Hundred 😉
Good Baud rates, plenty of emulations (even though no ANSI, no VT100)... nice terminal!
Those keystems also look like the ones on an Atari 1200XL. Here's an idea until you can find replacements. Move a keystem from a key that would rarely be used. The six key being used more than numeric ENTER. Guessing you don't need to use the numeric keypad so swap one stem from the keypad with the 6 key. If it is a high use device, the electrolytic caps would be a good idea to replace with new ones. Would buy this terminal from you. =)
You need a 3d printer. Make your own plunger stems! I've said it a couple of times out loud before I realized you can't hear me! Thanks for the videos. Keeps me motivated to do my projects
With sticky stuff that doesn't come off with soap and water, the stickey is likely oil based.
If you get tree sap all over your fingers (or any sticky plant sap or resin) some vegetable oil, or olive oil (and i'm sure WD40 would also work) will get it right off.
I didn't believe it until I tried it! Just rub it on your dry hand, and wash up with soap and water. Much nicer on the hands than a harsh solvent that is traditionally reached for.
with a name like "Liberty Electronics: Freedom 100" this system was aimed at a very specific country... can't put my finger on which specific country though..... /s
The "rub out" on the keyboard is making me think that this thing is British. My ZX81 and ZX Spectrum also say that.
Why don't you re-cap every time and save us the aggravation. P.S. The caps are STILL BAD(when you measure their rated capacity), even though they have reformed.
Keyboard button caps look similar to Lego pieces. I think Lego should start making customizable keyboards.
It didn't heal itself. You have the Digital Healing Touch. From now on, when you get an old malfunctioning computer, the first thing you should always try is placing your hands on it and saying: "I HEAL YOU!" See if that works first.
Nice repair I wish I would have know about the WD-40 trick when I was working on TV repair in the late 90s.
Regarding the Cousteau society sticker. There was a research center in Norfolk VA from 1980 to 1996. That center was relocated to Chesapeake VA and it still active to this day.
Thank you for the content it is super interesting keep it up!!!
Applying self-restraint to keep from making Trailer Park Boys "Freedom 35" jokes...
"RUB OUT" is what the Delete/Backspace key is called on a Sinclair ZX81. I think it had something to do with the British referring to erasers as "rubbers". The internet wasn't widespread enough back then for most Brits to realise that "rubber" means something completely different on the other side of the pond. 🤣
Excellent as always! Been looking for a terminal for some time however too expensive
I have two terminals that were fairly affordable. One is a Dec VT320 that I paid $199 for. It's pretty great and highly recommended. The other is an IBM InfoWindow II that I paid $150 for. This one is a mixed bag. It has a real buckling spring IBM keyboard, but it doesn't support VT100.. so unless you have an AS/400 or System/36 server, it's pretty useless.
@@misterkite VT100 is what I'm looking for as it works with just about anything. Unfortunately, living in Canada makes for expensive delivery and afraid that if not packed perfectly it will become recycled plastic:(
I have a micro from my childhood (yeah, I'm a young whipper-snapper born in 1985) that has a keyboard with very similar look to this. :) Another awesome video, Adrian.
All electrolytic capacitors have issues with "forming." When they are de-energized for a long time, they stop being capacitors (I.E. de-form). But once you re-energize them they will "re-form" the dialectric. Unfortunately if you are not careful about it, the capacitor can fail.
Please please please, fix the keyboard somehow.. repurposing other switches, 3D printing.. you have the key caps therm must be a way
I guess they reason they had the The Cousteau Society sticker on there was because they
pretty much deemed it a boat anchor when they 86'ed the thing.
I have had the same strange self healing thing happen several times, someone brings
something over for me to have a look at, I see what is it doing or not doing correctly,
I open it up do a quick visual check, and do some preliminary futzing of wiggling a
few wires, unplug and re-plug a few connectors, check any Pots that are in the circuit,
spray any circuits down with electrical cleaner and Viola!
when I bring the fully functional item back to the person , they think I'm some sort of electrical genius. I tell them I did'nt do that much, and it started working again.
strange how that happens some times, and other times it is a 2 hrs of diagnostic to figure out
what IC, Transistor or other part has given up in the thing.
It's so bittersweet when intermittent faults 'fix themselves'. On the one hand, hey, no more problem! OTOH, it's so unrewarding not knowing what was wrong and why, and what went right and why.
It's part of the 68-hundred series, not the 68-thousand series. Not sure if that was just misspoken or not, but, unlike Intel, Motorola decided to make their new microprocessors *not* backwards compatible with their old ones, thus the split between the 6800 and 68000 series. (9:30)
Jacques Cousteau was a famous filmmaker who did make documentaries of the sea and nature around the sea. On wikipedia I see that he passed in 1997. He was the "david attenborough of the 1980's and '90
The switches that keyboard uses are what is commonly referred to as an SMK Vintage Linear. The Kaypro II uses the exact ones you need.
maybe the vhold etc. were crunched up with goop etc and dit not work correctly, maybe shorting etc.. by adjusting you got rid of the stickyness/conductivity and thus allowed it to work again.
just an assumption of course.
I wonder if what you’re looking at is ‘ringing’… I had a bunch of monitors that had cracked fly back cores and which caused ringing and horizontal fold over. I’m pretty sure that’s vertical fold over that we’re seeing.
This terminal looks quite a bit like the ones from Fallout but I don’t remember what the actual terminals those are based on at the moment
ADM 3A for the desktop ones.
@@kylebrown5537 thank you!
Please do a video explaining how a terminal works, how to connect, what is the protocol, and so on...
The "goo" or "grease" from silicon degrading (which is what that cap on high voltage cable looks to be made of) can be washed off with dishes liquid soap. The regular soaps, either solid or liquid, just can't dissolve it well.