Thank you so much for offering to help with this! It's just wonderful seeing such a lovely piece of tech functional again. You guys are awesome 👍

Apollo engineers repair calculator during lunch break.

I never expected a delay-line memory system to show up in a calculator like this

I know that I understand some electronics, having worked in the field many years ago, but Master Ken is a Sensei! It is always a wonder to watch him work. Thank you for both your content and managing to get such a great team of honest, humble and knowledgeable people together.

I'm so happy he sent it to you guys! Marc and the team are the most professional and qualified around. Some folks were advising he send it to an amateur and I was worried. LGR is great

There is an interesting earlier version of the ICC-0082 with true nixie tubes! I have two of these, and they work!

When two of my favorite channels work together you know it's going to be a good day!

I just love Ken. He does a such phenomenal work in restoring every piece. Logic piece of our human minds barehand creation. From his kittle, explaination, blog, career and calmness. I really hope i can be someone like him one day! Thank you for the interview as well, Marc! Edit: + Every assistant and producer here!

I'm going to have to say that this is something I couldn't ever have imagined would happen. Supreme!

We need to see that calculation in slow motion. Would be interesting to see what those tubes are actually doing during the number crunching.

I've enjoyed watching Ken and Marc in action! They are such smart guys!

Marc & Team this was fantastic! Also glad to see the Collab with LGR, another great channel! Also want to say it is great that your team is so knowledgeable about older technology - you know the saying, if we forget the past, we are doomed to repeat it. Old ideas still are relevant to new inventions and discoveries.

I think Ken is a relative of Spock - "its a pretty strange architecture" - fascinating..

LGR, CuriousMarc, and now Adam Savage with that Ghosbusters gizmo - it’s like Infinity War but for my nerdy KZfaq channels

As soon as I saw the title, I knew this thing was in safe hands. Glad you guys were able to get it back to full health.

Back in 1980, I was working at a company. One of my co-workers told me that her father's boss had bought one of the first hand-held calculators. (I think later than this, with the little red LED numbers). It cost $600.00, and they all went over to the Boss's house to see it! Thanks for helping out LGR!

Ken brings out his double barrelled brain gun again and blows us all away. The Master.

LGR in collaboration with CuriousMarc. Two of my most liked vintage computing channels here on KZfaq. Very nice to see such a beautiful piece of tech here.

I inherited my Uncle's Ampex tape player (tube based) but all it did was buzzed. I learned tubes way back in Junior High, but not well enough to understand the diagram. About 30 years later, I took a leap of faith and replaced the power circuitry. I had to replace two of the tubes with Russian tubes, which no doubt made my Uncle roll over in his grave (he used the player to record the concerts he did for the Admiral during diplomatic assignments). Well, with that guesswork, it now works. A lot of "standards" changed, like in the audio plugs, but a few adapters and all is OK. I gain a lot of comfort seeing you applying the same intelligent guesses and reasoning I did. Growing up in the 60's, with a "shop" teacher who hated my mother, I managed to learn enough about electronics to enjoy this channel. It relieves me to know I really do understand the Electronics of the Ancients .

A great crossover! I'm now waiting for a whole season of CuriousMarc fixes LGR Thrifts :)

I love what this group considers a "simple" repair.

Wow !! LGR and CuriousMarc

14:18 Master Ken's super dry humor . LOVE IT

I love that you can see the numbers 'roll' as it is calculating.

Reverse engineering the talents hidden in old technologies, I see, is not an easy task. You are very good! Congratulations.

"Wow, only you can figure that out" said Marc to Master Ken...🤣

You know what... when I got a case like that, labeled "Dictaphone", I would be very surprised to find calculator in there!

This motivated me to fix CASIO A-SA from 1969. A fuse was blown. It costed 50 cents 2010. Fully functional Nixie-tube Casio seems to be 800€ at Ebay. PMOS-logic is very strange, because operating voltage on those chips seems to be negative 25V.

Thanks, Marc & Company! Nice to see that lovely seven segment display. That glowing orange presentation is familiar to pilots of a certain age; the famous Bendix King KX-155 nav/comm (among others) used a later gas discharge module for numeric frequency display. The modules are no longer available, and gradually the fine old radios are being phased out as their displays conk out.

I used to repair calculators way back in 60’s-70’s and a good test calculation was 22/7 = Pi or 3.142857 ! Of course all the keys/functions were also tested! There were many makes but Sharps had a huge range! The early models had 14 logic boards all with discrete components! Fault finding was single step mode and checking flip-flops which made up registers for + - etc. X was repeat addition, division was repeating subtraction. Fault finding was to component level (chips were in research at that time) and logic boards cost a fortune! Fraser

so glad this lovely calculator made it to the safety of your lab and was able to be fully revived, even putting back an original component others might consider dubious 😁

The serial logic of this machine reminds me of the design of the original KENBAK-1 microcomputer which used two 1K-bit shift registers to implement 256 8-bit bytes of RAM with a hard-coded state machine to implement not only a fairly clever instruction set but all of the front panel logic for examining, storing memory as well as running and halting the processor. Very clever and very different from typical modern microcontroller design.

Great job fixing such a cool calculator. Those chips really do look like Rockwell chips, they are very similar to(but smaller than) the PWM "MOS Voice" Chips in the Allen Digital COmputer organ from 1971.

When worlds collide! ❤

So wonderful to see a collab between you both. Fantastic restoration and great to see it working again.

that's crazy, when I saw this broken calculator on LGR, I thought "oh CuriousMark could repair this..." and now you are fixing his calculator xD

Marc, Thanks for helping Clint.

That's awesome. I never thought you and Lrg would do a collaboration. You guys should do more! Cheers from Park City Utah!

Typos are timeless. Great video.

Clint _AND_ Marc + gang. I can only handle so many heroes in the same video :)

Two of my favourite KZfaqrs collaborating is just awesome! :D

Ahh I loooove that you can see it calculating on the screen, since it’s serial and puts the digits up with a shift register. Feels soo classic sci-fi. An effect that can waste a bunch of cycles nowadays. Really adds to the vibe from the neon tubes! Neon discharge is one of my favourite hues ever.

Battery juice ate Marc's HP 9825(?). Now it's done it again! Batteries should be sealed and/or located below the electronics so the juice runs out the bottom and saves the PCB. Thanks, Marc and crew for the great repair video. 👍👍

I think it was very nice that you helped him out and even more that another vintage piece was made whole. I too do these repairs and I find that I get tremendous satisfaction from doing rescues like this one. I'm hoping that people will realize that even f they don't want or fancy something that they will 'pass-it-along' and one of the best places for this is thrift stores where I have found several very nice old things that with just a little know-how gave me a great piece to use and enjoy...

Love it when youtubers help other youtubers! Thanks!

Best KZfaq retro tech crossover ever.

Absolutely magnificent repair. Great work bringing her back from the dead! So excited for LGR I am a huge fan. I am lucky to own a fully working Nixie Tube Walther ETR-4 from 1973. It also has a shift key to display the other 8 digits. It also places the decimal points in a similar way.

I watched LRG's video on this and it brought back memories. I found one of these in a thrift shop back in 1983, I think I paid $2.00 for it, the one I had was the Sanyo branded version. When ever thrifting I'm always on the lookout for old calculators, TI, HP and others.

Whaaaaat! NO division by zero? 😱😱😱 I was expecting this moment for the whole video!

That serial bit math I would never have guessed. Interesting that in the end, you really didn't need the schematic or the knowledge how the chipset works. Cool!

The rice wine joke made me chuckle.

I'm fascinated by vintage display tech. This was really neat to see the inner workings and repair process. Thanks!

Oooh! I've repaired two of these very units, now in my display!

This brings back memories. A mix fo combinatorial and sequential.

Yes Clint does an excellent job with his videos. That comes with doing such work professionally for nearly twenty years.

Man, this was like watching a meeting of scientists determined to solve a mystery. Just awesome!

That last segment cracked me up. Nerd humour is the finest humour.

And Asianometry just released his history of Facit! So calcutors are the flavour of the month 😊

Great episode! Watching keeping this wonderful technology alive is very satisfying! Thank you for your rescue mission!

This colab makes me so happy! ♥

Well that was a pretty simple problem to diagnose and fix. Leaking batteries eat the copper tracks on PCBs in a lot of old stuff.

I saw the original video. It’s so great to see you successfully fix it. Thank you!

oh my goodness... 2 of my favorite channels together... absolutely amazing!!!

I am totally in awe of your knowledge of all things electronic.

I was just thinking about this calculator... My calculator collection has been growing lately and I've been fantasizing about it, great job making it work again!

I knew there was a reason I subscribed to you a while back! This was a great restoration, fantastic job!

Its loveliness increases, it will never pass into nothingness. Great restoration project. Those ceramic ICs, teeny tiny tubes... absolutely lovely stuff. And it HAD to be ruined by a leaking electrolyte, didn't it? I use IPA for dealing with this sort of damage, but I'd replace all the electrolytics if I were working on it. Might use some clear nail polish for attaching the wire to the PCB, also solder it where the trace remains (especially when you don't have the soldermask here) for better mechanical durability. The Facit looks like a miniaturized version of the Soemtron 220, a marvel of 1960s East German electronic engineering running on full discrete germanium transistor logic, ferrite core memory and 15 nixies. Looks very similar but a few times bigger. That's gonna make a nice restoration project. Inspiration coming from you, of course. Makes me wish I could work with you in your lab. 4:09 now THAT looks pretty... discombobulated.

What a beautiful calculator. Great job getting it sorted.

Two of my favorite channels

Literally my two favorite YT channels hopping in bed together. What a great day!

Man! I'm so happy that the calculator came here.

Ultra neat machine ..... so cool and the explanation from Ken was amazing , electronics trying to mimic the old dinosaurs ....

It's a trip being able to "see" the calculator actually calculating when you hit enter. So cool.

Wayhey, well done Marc, another lovely vintage calculator rescued, and what a little beauty it is too, kind of glad it wasn't a fault involving unobtainium.

That is a great result with the sherifs of electronics 😀👍 Not a subject of this video but the world is so weird nowadays, alot of people see this as trash because it is not working, bulky and old. I wonder why that is as is, is it because people don't understand the art behind technology? Imagine what people throw away these days, it is enormous without some effort to repair it, every day, every week, every year. Insane. Will there a blank period in time of history because of this behaviour? I am very glad people like you still exist, it is wonderful. Nice piece of well made tech restored to its glory. Nice video!

LGR is great. Nice work Marc. I just watched a documentary on Facit yesterday so this is nice timing.

Astonishing repair!

you guys are awesome. that's an impractical calculator from a bygone era. "the minus sign is in your head" is hilarious.

What an awesome collab

My two favourite KZfaq creators thank you

In 1970 most calculator's used the same logic as mechanical adding machines this is why there is a += and a -= if you want to add a number use += but taking away needs a bit of thought. 10+2= ? 10+=2+= will give you 12 as expected.but to take away 2 from 10 you need to push 10+=2-= to give result of 8 . Great restoration of lgr's vintage calculator the only thing is once you start collecting them it gets a bit out of control. Great work 👍

Absolutely amazing!

Greetings! CuriousMarc here with another LGR fixing thing.

Awesome work! Even though the problem was anticlimactic, the process and description of the hardware was fantastic!

Love the channel.

I liked seeing that serial ALU design. Funnily enough, I implemented a similar scheme in a Xilinx FPGA a few years back to make optimal use of some of the fast built-in addressable shift register elements at speed. The more things change, the more they stay the same! And now I have LGR's whole new channel to explore, too. Nice.

Cool crossover with LGR, what's next - 8bit guy, Teachmoan, Tehnology Conections etc!?

Very nice fix, lovely calculator with those glowing numbers :)

Wonderful machine!

Great repair!

What a nice piece of equipment.

nice work!

Love the crossover! Liked LGR's vid and this one too!

That nixie calculator has a real nice feel to it

Nice save!

Both my favourite KZfaqrs!

Beautiful calculator!

This has to be one the easiest restorations you've done in quite a while. Great job keeping this calculator from being cannibalized and being lost to history.

The most ambitious crossover of 2022!

this is very cool!