Liberty Electronics: Freedom 100 Terminal Repair

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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/details/liberty-1...
Freedom 100 Manual:
www.bitsavers.org/pdf/libertyE...
Photo of a "new old stock" Freedom 100:
i.redd.it/tcszkfs8x7661.jpg
Rebadged Freedom 100 used as the display/keyboard for the Morrow MD-3:
dunfield.classiccmp.org/morrow...
Support the channel on Patreon:
/ adriansdigitalbasement
Adrian's Digital Basement (Main Channel)
/ @adriansdigitalbasement
-- Tools
Deoxit D5:
amzn.to/2VvOKy1
store.caig.com/s.nl/it.A/id.16...
O-Ring Pick Set: (I use these to lift chips off boards)
amzn.to/3a9x54J
Elenco Electronics LP-560 Logic Probe:
amzn.to/2VrT5lW
Hakko FR301 Desoldering Iron:
amzn.to/2ye6xC0
Rigol DS1054Z Four Channel Oscilloscope:
www.rigolna.com/products/digi...
Head Worn Magnifying Goggles / Dual Lens Flip-In Head Magnifier:
amzn.to/3adRbuy
TL866II Plus Chip Tester and EPROM programmer: (The MiniPro)
amzn.to/2wG4tlP
www.aliexpress.com/item/33000...
TS100 Soldering Iron:
amzn.to/2K36dJ5
www.ebay.com/itm/TS100-65W-MI...
EEVBlog 121GW Multimeter:
www.eevblog.com/product/121gw/
DSLogic Basic Logic Analyzer:
amzn.to/2RDSDQw
www.ebay.com/itm/USB-Logic-DS...
Magnetic Screw Holder:
amzn.to/3b8LOhG
www.harborfreight.com/4-inch-...
Universal ZIP sockets: (clones, used on my ZIF-64 test machine)
www.ebay.com/itm/14-16-18-20-...
RetroTink 2X Upconverter: (to hook up something like a C64 to HDMI)
www.retrotink.com/
Plato (Clone) Side Cutters: (order five)
www.ebay.com/itm/1-2-5-10PCS-...
Heat Sinks:
www.aliexpress.com/item/32537...
Little squeezy bottles: (available elsewhere too)
amzn.to/3b8LOOI
--- Links
My GitHub repository:
github.com/misterblack1?tab=r...
Commodore Computer Club / Vancouver, WA - Portland, OR - PDX Commodore Users Group
www.commodorecomputerclub.com/
--- Instructional videos
My video on damage-free chip removal:
• How to remove chips wi...
--- Music
Intro music and other tracks by:
Nathan Divino
@itsnathandivino

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Опубликовано:

3 июл 2021

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Комментарии : 420

@bramsoens1143 3 года назад

Every scuba-diver knows of the legend and pionier of Jacques-Yves Cousteau.

@c0olcast 3 года назад

Well said! I'm not a scuba-diver but I love documentaries and grew up watching and reading of him.

@briansouth9325 3 года назад

You mispelt Jacques custodian

@organiccold 3 года назад

@@c0olcast me too. Love it

@Peugeot306 3 года назад

@@briansouth9325 And you misspelled misspelled…

@deamondeathstone1 3 года назад

John Denver wrote him a love song! Well his ship Calypso actually, but details.

@chipacabra 3 года назад

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.

@amirpourghoureiyan1637 3 года назад

Do you mean the phosphor? Photons are always moving

@thomasbonse 3 года назад

@@amirpourghoureiyan1637 Nope definitely photons. 😉 Fortunately, Adrian didn't tip this on its side, otherwise the electrons would've fallen out. 😁

@RetroJack 3 года назад

@@thomasbonse I see you are a man of culture!

@thomasbonse 3 года назад

@@RetroJack I rarely make jokes, but when I do, I only make bad ones. 😳

@mal2ksc 3 года назад

The pixies had forgotten why they were angry. They needed to be reminded.

@a.p.gerlach7136 3 года назад

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 :-).

@pauldourish 3 года назад

Further evidence for the Jacques Cousteau link is that the sticker says "Calypso" which was the name of his ship.

@Zerkbern 3 года назад

I noticed that too.

@badscrew4023 3 года назад

Definitely is. And a swimming figure as its logo :)

@Grinder2112 3 года назад

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.

@badscrew4023 3 года назад

@@Grinder2112 oh you may be right here

@Julien987 3 года назад

Thank you !

@crayzeape2230 3 года назад

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.

@organiccold 3 года назад

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.

@cee128d 3 года назад

What do you want to bet that he will receive several in the next couple of Mail Call Videos.

@proCaylak 3 года назад

@@cee128d yeah, people are so generous to adrian. a big success on his side.

@cee128d 3 года назад

@@proCaylak Not just Adrian. I see that with a lot of the Retro computer and the Car Revival RU-vidrs .

@organiccold 3 года назад

Haha it will happen lol

@kilwala2242 3 года назад

Linux has a terminfo entry for this terminal. export TERM="freedom100"

@christiancarassai9540 3 года назад

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...

@wbfaulk 2 года назад

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?

@knghtbrd 2 года назад

@@wbfaulk yeah, he needs to install ncurses-term.

@edgeeffect 3 месяца назад

I think the Unix terminfo database pretty much has everything.

@jacksat2252 3 года назад

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.

@BertGrink 3 года назад

I remember those very well 😀

@MrMe4444444 3 года назад

I had a window decal like that in the 70s

@hjalfi 3 года назад

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.

@lisandro3614 3 года назад

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...?

@retrolabo 3 года назад

Those stems can be 3d printed. I have some if you are interested

@jurviz 3 года назад

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.

@ultrametric9317 3 года назад

The labels are always jacked up because an asset tag was slapped there, and removed when decommissioned (stolen - heh).

@mal2ksc 3 года назад

@Robert F Film crews that need props?

@ultrametric9317 3 года назад

@Robert F :) No idea. Same person who steals yogurt from the fridge :)

@williamharris8367 3 года назад

@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.

@kevinwright7931 2 года назад

The Cousteau Society is about Captain Jacques-Yves Cousteau is the father of underwater sea exploration. You have a piece of history there Adrian.

@ketturi 3 года назад

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.

@The_Studioworkshop 3 года назад

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

@ketturi 3 года назад

@@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.

@caseymulcihy89 3 года назад

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.

@Adam-McG 3 года назад

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.

@zitt Год назад

Y not use a dremel to shave the long stems ... that should work; I'd think.

@luked3172 3 года назад

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. :)

@pipschannel1222 3 года назад

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 ;-)

@dadrad 3 года назад

This is really cool. I love seeing vintage terminals connected to Linux computers!

@alerey4363 3 года назад

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

@jameshearne891 3 года назад

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.

@randyab9go188 3 года назад

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!

@thomasbonse 3 года назад

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.

@joe--cool 3 года назад

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).

@ericcarrozzo5846 3 года назад

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

@Clavichordist Год назад

I worked for Visual Technology from 1980 to 1987 and fixed their V200s which were similar to these. Visual was famous for their emulation and mostly emulated DEC terminals throughout their product lines. Seeing this terminal brought back some good memories of working on fun electronics. Visual used Z80s for their terminals and I learned so much about the circuits, PIO, SIO and peripheral chips. Later they promoted me to field service and I got to work on the much old Ontel products which were really complex but fun too. You did give me some flashbacks when you opened up the terminal. I got zapped quite a few times from the residual charge still in the CRTs after disconnecting the cap and discharging the tube. One day I got zapped and ripped the back of my hand inside the chassis. The zap didn't hurt so much as it startled me and I yanked my hand reflexively and caught the back of my right hand right at the middle knuckle and had a bloody mess as a result.

@randyab9go188 3 года назад

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.

@adriansdigitalbasement2 3 года назад

Great tip!

@jensschroder8214 3 года назад

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.

@adriansdigitalbasement2 3 года назад

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.

@kaitlyn__L 3 года назад

@@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

@mrfrenzy. 3 года назад

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.

@draggonhedd 3 года назад

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.

@lauram5905 3 года назад

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)

@tiporari 3 года назад

@@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.

@ct92404 3 года назад

@@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.

@tim_buck_too9126 3 года назад

@@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.

@ct92404 3 года назад

@@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.

@michvod 3 года назад

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 :)

@LeftyLabs 3 года назад

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.

@thedungeondelver 3 года назад

LIBERTY and FREEDOM on July 4th! Thank you, Adrian!

@NikkiWrightVGM 3 года назад

The CRT must have really Rubbed Out to make everything so sticky :P

@megaglowz8540 3 года назад

How rude.. . . . . . . What ya doin later....lol

@thomasbonse 3 года назад

Well, what else was it supposed to do? It was practically in solitary for years.

@minty_Joe 2 года назад

I see what you did there. ;-)

@one_b 3 года назад

That terminal is the perfect main control for Liberty Prime from Fallout. Needs a Robco Termlink simulator. :)

@decidedly_retro 3 года назад

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.

@mdofxds 3 года назад

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.

@LightTheUnicorn 3 года назад

Always nice when electronics do the repair work for themselves if you ask me! Very nice little terminal!

@WilliamAndrewPhilipBodie 3 года назад

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 :-)

@Adam-McG 3 года назад

Word’s that’s end’s with’s S’s don’t’s all’s get’s apostrophe’s.

@WilliamAndrewPhilipBodie 3 года назад

@@Adam-McG i'm German so i don't know nor do i care :-)

@theannoyedmrfloyd3998 3 года назад

@@WilliamAndrewPhilipBodie You should care.

@joe.tiziano 3 года назад

This video does not suck, have a awesome 4th July Adrian.

@Saavik256 2 года назад

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.

@DSP107 3 года назад

Although this's been a "quick money" case 😜, it's always rewarding to see a good'ol procedure-driven repair attempt. Go on like this! We old technicians like things this way! 👍

@jameshearne891 3 года назад

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.

@thedungeondelver 3 года назад

A short (5-8mm) length of paperclip wire would do the trick.

@jasejj 3 года назад

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.

@VincentGroenewold 3 года назад

Stems? 3D printing to the rescue! :)

@mattelder1971 3 года назад

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.

@mal2ksc 3 года назад

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.

@jlfrodsham 3 года назад

@@mal2ksc Whoa... neat idea. Now the ol' brain bucket is whirring with possibilities!

@kaitlyn__L 3 года назад

@@mal2ksc modern Dasher or Dancer SA caps perhaps… if he has a set I guess

@mal2ksc 3 года назад

@@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.

@elmestguzman3038 2 года назад

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!!!

@noland65 3 года назад

I wouldn't be much surprised, if "Freedom 100" mode was VT100 emulation (less license).

@knghtbrd 2 года назад

Not even close. (I checked.)

@noland65 2 года назад

@@knghtbrd Thanks for checking and coming back on this. (However, it would have been quite a marketing move.)

@skonkfactory 3 года назад

If you can CAD up replacement stems I can print them for you on an SLA printer, like I did for akbkuku.

@redace001 3 года назад

He's got a SLA printer... I found this already CADed : www.thingiverse.com/thing:4556405

@skonkfactory 3 года назад

@@redace001 I don't believe he does? Anyway, those are too long.

@redace001 3 года назад

@@skonkfactory Easy to adjust the model if they are. 😎👌

@RudysRetroIntel 3 года назад

Excellent as always! Been looking for a terminal for some time however too expensive

@misterkite 3 года назад

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.

@RudysRetroIntel 3 года назад

@@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:(

@peterg.8245 3 года назад

Thanks Adrian for making me feel young. That monitor was “born” a couple weeks before me. (16Feb83)

@Vermilicious 3 года назад

Nice and bright. Also clean, neat interiors. Freedom, oy!

@bradnelson3595 2 года назад

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. :)

@TimmyJoe633 2 года назад

My gran had a Panasonic TV in the 80's with that same boxy on screen font, seemed so hi tech at the time 😄

@larrywilliams8010 3 года назад

32:26 Channeling Eric. Awesome

@badstate 3 года назад

I love that terminal. I want one.

@badscrew4023 3 года назад

Cousteau and Calypso in one statement? It's definitely that Cousteau.

@roaddan01 3 года назад

The Calypso was Jacques Cousteau’s team exploration boat.

@floydfix420 3 года назад

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

@bikkyghaisai7692 3 года назад

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

@retropuffer2986 3 года назад

Nice Terminal!

@InssiAjaton 3 года назад

The sticky stuff is PLASTICIZER, used to soften certain plastics. The shroud of the HV connector is a typical example of that softened plastic.

@Lee-il5kc 3 года назад

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.

@PeterHaida 3 года назад

Happy days watching Jacques Cousteau documentaries during the 1960s & 1970s on his boat Calypso.

@Aruneh 3 года назад

Next mail call Adrian unboxes a giant mainframe.

@DanPellegrino486 3 года назад

I'm always afraid anything that fixes itself is soon to break again in short order. Not that this is mission critical so I'd call this a success either way. Great work as always.

@Starchface 3 года назад

Indeed. I prefer a reliable failure than something that "fixes" itself. You can't fix it if it's working.

@HudsonGTV 3 года назад

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.

@marksterling8286 3 года назад

I really miss the original serial terminals, VT200 was my all time favourite.

@jeanstp4522 3 года назад

Yea, the lucky ones got the vt200. Me, I got stuck with the dirty second-hand vt100...

@enzito_sdf6978 3 года назад

wow i love the font this thing uses

@KennethSorling Год назад

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.

@nukelauncher95 3 года назад

Haha! In my opinion, all keyboards should have a "rub out" button!

@mattsword41 3 года назад

A gangster terminal ;)

@frozendude707 3 года назад

They all do, but the British English to American English translation is "backspace", but i think it is delete on this one :P

@mal2ksc 3 года назад

@@frozendude707 There is also a "BACK SPACE" key. So RUB OUT must do something different.

@frozendude707 3 года назад

@@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.

@mal2ksc 3 года назад

@@kaizenneko725 If you had a _nice_ typewriter, it would switch to a white ribbon and then type the same character you're rubbing out.

@frugalprepper 3 года назад

I still keep my RS232 Breakout box in my networking tool bucket. Haven't used in over 10 years though!

@TeionM83 3 года назад

I love those faults that you start to debug and they fix themselves.

@thomasbonse 3 года назад

They scurried away while he was tracking them down. 😁

@clivejones5880 2 года назад

I think you answered your own question here. :-) The unit sat unused for years and the dielectric properties of one or more of the electrolytics had changed and the capacitor(s) reformed after being exercised for some time. Sometimes this works fine but other times the capacitors may be borderline.

@JasonHalversonjaydog 3 года назад

could you trim down the stem on that switch to shorten it a little bit? it looked like it had a little extra length below the key where you could cut some off and the key would still fit, but i don't know

@kd5byb 3 года назад

Coolest RPi interface terminal EVER.

@Jody_VE5SAR 3 года назад

I thought you secretly sprayed some Deoxit into the adjustment pots to clear that up. :-)

@geoffquickfall 2 года назад

Looks like the electrolytics reformed over time. If so, may be sometime in the future it will require some new ones on the screen PCA. Of course, typed this just before you mentioned the reforming cap!

@TechTimeTraveller 3 года назад

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.

@Lee-il5kc 3 года назад

I'd adjust the linearity then the vsize. And clean those pots. I bet those couple of electrolytics in the vertical deflection section self healed a bit once power was applied for a while. That's a really great terminal. I am a little jealous. ;D

@edgeeffect 3 месяца назад

Good Baud rates, plenty of emulations (even though no ANSI, no VT100)... nice terminal!

@kztech1319 3 года назад

Is it possible for one to superglue the broken stem back together? Or is there still pieces missing

@pelgervampireduck 3 года назад

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.

@kaitlyn__L 3 года назад

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!

@tstahlfsu 3 года назад

Your capacitors reformed as it warmed up :-D

@alexenochss 3 года назад

a few thoughts.. you could pull the stems from the keycaps.. and superglue them back together OR take one of the stems out and see if someone can make a mold of them OR maybe even send a stem to someone that can 3d model them to spec and have it 3D printed if your worried about the super glue option coming apart you could always take a needle and embed it inside both the top and bottom half of the stem and glue them together with the needle in it to give it more sturdyness i recently needed to repair a tandy 1000 keyboard which has some fujitsu leaf spring gen 3 keys and the break key was litterally missing the stem so after asking around the net and finding no one with any i looked at the keyboard closely and realized while the space bar has a stem in it..it doesnt actually HOLD ONTO the stem like the rest of the keycaps..rather the springing mechanisms on the outsides of the spacebar are what it holds in place..so the stem for the space bar was just acting as a spacer to press the key... quick grab of a piece of plastic and a dremel later i swapped the stem to the break key and stuck a piece of plastic that was the same height width of the stems in the space bar location and it works theres literally no way to tell unless you take the keyboard apart ..i do wish it were original (so if you happen to have an extra please let me know LOL) but im glad its fully functional again above all

@santonucifora 3 года назад

The screen "out of wack" may have been oxidation on the screen control knobs. The knobs are super-sensitive and can change without touching them. A little Deoxit will usually fix those pretty quickly and result in a more stable picture. Might be worth a shot next time you have it open or for a possible other repair in the future.

@pgodwin 3 года назад

What's the HV probe used to discharge the CRT?

@KennethSorling 2 года назад

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.

@maxtornogood 3 года назад

I'd like to see it turned on again later to see if the termnal's "self-healing" repair maintained itself...

@volvo09 Год назад

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.

@MrBrianms 3 года назад

End of line. Booking Scuba Dives at the Calypso. Thanks.

@user-gt8ql9vp1b 3 года назад

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.

@CPPRODUCTIONS1001 3 года назад

So, how can you use an old terminal? Can you connect it up to anything modern or do you need an old server to run them. I don't really understand how terminals work?

@eDoc2020 3 года назад

They can still be used with modern text-based applications. Adrian was connecting to his Raspberry Pi 3 but it would be just as easy with any other Linux system. Anything that can be done in your computer's 'Terminal' program can be done on a real terminal.

@dormcat 3 года назад

Number 25 of Ren'ai Road ("Jen Ai" was an older-styled Wade-Giles transliteration) Sections 2, 3, and 4 in Taipei were all rental office buildings so it could be located in any of them; Section 1 was the dormitory of NTU hospital. The company is likely long gone.

@draggonhedd 3 года назад

You could probably plastic weld some cross stems back onto the switches in the system. or do some careful dremel work on the apple switches to continue the cross pattern further down on the stem, and then cut it shorter.

@bloxyman22 2 года назад

What we witnessed was caps at least partially reforming gradually on camera.

@ultrametric9317 3 года назад

It's surely a VT100 clone. I so want a decent serial terminal for my Sun server! Soon!

@DerekWitt 3 года назад

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. :)

@ultrametric9317 3 года назад

@@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.

@davefarquhar8230 3 года назад

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.

@threejeeps4419 2 года назад

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.

@garethfairclough8715 3 года назад

Cousteau might be the diver & submariner, especially given the image on that sticker and it stating Norfolk Virginia (large port & naval base there, iirc).

@NeonNightmares 3 года назад

Couldn't you just grind/cut the stems from the apple 2 keyswitches down so it would be the right hight?

@trumpetporvida 3 года назад

How did you hook it up to the raspberry pi?

@YogSothoth1969 3 года назад

Hope you get the broken keys fixed :-)

@OzRetrocomp 3 года назад

"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. 🤣