EEVblog

[@sswpp8908]

I've had this Casio calculator since elementary school over 10 years ago and it still works.

[@CB-RADIO-UK]

I am glad that I am not the only one in the world that likes calculators.

[@bryceforsyth8521]

fredintheshed1 Yes English, Very Grammar!

[@CB-RADIO-UK]

Bryce Forsyth Twój komentarz nie ma sensu.

[@bryceforsyth8521]

Tak polska , bardzo Gramatyka

[@CB-RADIO-UK]

Bryce Forsyth LOL ;-)

[@bryceforsyth8521]

...

[@nodariel]

You should look at the current consumption on a DSO. Very interesting waveforms, especially the voltage across the ceramic caps.

[@38911bytefree]

Dave, did you notice, in early handheld games like Nintendo Game wach, that the consuption is insane low ?. A couple of little batt lasts a year, even more. How the hell they manage to get it as low in early 80's. Its incredible to me. How advanced were at that point !

[@thatsunpossible312]

I'm late to this, but I didn't see the answer to your question in the comments. It's probably Tape Automating Bonding (TAB).

[@frankhardy123]

I am here 4 years after you were 4 years late.

[@samsonofdan]

This is definitely Chip on Flex (COF) packaging technology with a large pitch wire bonding technique, possibly 25 mil pitch? These flex technologies and COB (chip on board) are starting to become popular in mobile consumer products today, and that is very neat to show from the 80's era. That flexible clear material is probably silicone-based (not silicon) to serve as a mechanical stabilizer with a low dielectric effect. Very neat!

[@Blitterbug]

The Tandy calculator is a rebadged Casio fx-115. Best programmers' calc for the money back in 1985, I reckon. I bought one for the decimal - binary - hexadecimal conversion (quicker than doing it in my head!) Mine's still in full working order, but is sadly now a bit dented from when my eldest lad used it as a teething ring some 30 years back.

[@Falcrist]

Dave, I'd LOVE to see you tear down a TI83 or 84 or even a very old 83 AND an 84 to see what (besides the USB port) may have changed over the years

[@ProjectPhysX]

I found a broken fx-82 solar (looks the same) in the bin. The display was very pale, unless when bending it with quite some force. The problem was that repeated mechanical stress on the PCB had destroyed SMD capacitor C2 on the back (2:29). I replaced that with a different one of unknown value and now it works again! I also replaced the 10uF electrolytic storage capacitor C1 with a 100uF one, so it can work for about a minute without light.

[@metallchips8569]

I had to use this calculator to take the NV state HISET. I was much more familiar with the TI-30 and had to take this calculator home to learn how to use it. The internal construction of this device is uniquet!

[@kevtris]

on some of the older solar powered calculators, there were 2 LEDs in series across the solar cell to act as a crude voltage regulator. in bright sun, the LEDs DO light up. I tested it!

[@EEVblog]

If you have to ask the question, then the answer is no I'm afraid! (yes, it's possible in theory). These calcs would not "encrypt" data in any way.

[@Razor2048]

The thin film construction is still used but in a cheaper form, (many people use thin copper wire and packing tape in the place of a PCB when making their card skimmers as it allows the entire item to conform to the shape of the card slot (noticed it a while back on one of the ATM machines right outside of the Chase bank in a nearby mall (the skimmer was there for like 2 days (didn't say anything because I didn't want blaming me for it which many companies are known to do on security reports)

[@EEVblog]

Low power is easy when you only operate at 10's KHz.

[@pikuorguk]

Some variant of this got me through my GCSE maths 16 years ago. I taught myself binary and hex on it just by reading a few books and prodding the keys :)

[@EEVblog]

Technical transcription is very expensive if I had to pay for it. And I do not have the time to do it myself. So it would need to be someone suitable donating their time.

[@superdau]

A typical case of garbage in, garbage out. If you write something ambiguous like that, even humans will give you different answers (maybe not in this case; but try "1/2x" and see what answers you get). The calculation priority is mentioned in the manual. Implicit multiplication takes precedence, that's how the calculator implements it. And it's also quite helpful when being able to save the parenthesis in statements like "1/(2x)".

[@MrAtheist93]

the chip on the flex looks like a predecessor of those "chip on flex"-thingys used in some LCDs these days....

[@DemonTraven]

He said in the beginning of his testing ( around 4:10 ) that his microcurrent box was outputting 1 micro-amp as 1 millivolt.

[@EEVblog]

You'd have to do actual measurements on it and do the math based on usage and typical office lighting charge time vs use time vs losses etc. It does have relatively large solar cells on it. Most likely it's more a marketing gimmick than practical.

[@EEVblog]

It's a proprietary ASIC, you can't get the info.

[@EEVblog]

I met him at a Big Bang taping once, nice guy!

[@MDealer]

I use two K750s. If you have light in your apartment, it's enough for it to run AND charge the battery. Those people probably expect a dark room to charge it. In a dark room you still need to leave it near a window in daylight (or something) while you're at work and then you've got a good charge. :P It's more suited for the office, as good lighting works the best. I've never replaced something or had much trouble so far.

[@alison_withonel]

It was probably measuring the voltage drop across a known resistor. I don't know about the MicroCurrent box Dave was using though, so I can't answer definitively.

[@38911bytefree]

Yep, ist clear, just thinking in lsi chips in early 80's driving large segment lcds, piezo for the bipings, wont be so obvious even when runing over a clock xtal can 32768 hz

[@Knight8365]

Great to see that flat-flex construction technique. Flexible before there was flexible. Amazingly tiny current draw on all of them - the !69 must drain the cap a bit, though it recharges quickly enough.

[@Laogeodritt]

Mounting the batteries externally and wiring them to the calculator with an ammeter in series wouldn't damage the calculator.

[@ciprianwinerElectronicManiac]

Nice calculator colection Dave. I've always wonder how those on board chip looks inside. :)

[@bytebender]

the asic/uc in this model is an OKI (marked on the die)

[@Derundurel]

I wonder what the external diodes are for. Are they in series across the supply to clamp it? It must be a pain to add those considering the rest of the electronics is all on one die.

[@EEVblog]

That's the LCD. It is a Casio Calculator.

[@EEVblog]

Sorry, yes, I meant the solar panel.

[@Nordic_Mechanic]

You need to make a vid about fixing the voyage 200 calculator. You know when you don't use it for a while it stops working even if you put all new batteries in.

[@oisiaa]

You would be the easiest person in the world to buy Christmas gifts for. Just get something rare to take apart.

[@rocketman221projects]

Wow, those hardly use any power. My old calculator from 1976 needed 50ma @ 9v with all of the digits lit up!

[@BitZorg]

Its not perfect but the automatic captions on youtube are actually quite accurate.

[@TheProCactus]

Id like a hi-res photo of that glue holding the chip for a desktop background.

[@AdithyaBalaji]

Why is the Agilent multimeter reading in millivolts instead of amps? I guess the dial should've been set to read currents.

[@nullplan01]

The multimeter is measuring the voltage across a small resistor (the "micro-amp" he showed at the beginning), which allows him to measure the current by measuring voltage. That is necessary since the current draw is so low (microamps), that a multimeter would not pick up on that.

[@Crazytesseract]

@@nullplan01 he must have connected it across a 1k ohm precision resistor, if I am not wrong.

[@EEVblog]

If someone want to transcribe my videos and provide the suitable caption file, then I'm happy to upload it.

[@alishmanandhar3444]

hello may i know what is the work of ceramic caps and if possible can u also explain about 563 chip

[@Jeroen74]

At 13:16 ... there's clearly Sanyo printed there, not Casio.

[@ZILOGz80VIDEOS]

I've popped open pretty recent calculators that i've gotten for free and found a full flexi construction with an epoxy'd chip.

[@CommanderMouse72]

I cracked open a Casio fx82c to replace batteries and it was completely chip on flex

[@KarriKoivusalo]

Damn, looks so much like the FX-115d we had in high school! Has fewer buttons than it did, though.

[@TheSentientCloud]

DO A TI-84! I'd love to see some current draw on there! I'm sure your fans would donate you an old TI-84 for a comparison! I can't do it on mine because one, my meter is suckish, and two, I am just 15 years old and I can't spare a 100 dollar calculator! But I'd imagine that that would work in the milliamp range, saying that it needs 4 AAs to work. I think it would be awesome to see a comparison of the TI-84 to a scientific. Also test a four-function one to see if there's any difference there.

[@TripleJ85]

Wow - this takes me back to primary school and inverting our calculator displays by flipping... I guess it would be a polarised filter?

[@scaramonga]

I've popped open a few too, but I've now lost count, as I don't have any light to power my calculator, and that's the sum of it.

[@MrDutchterminator]

wow, I didn't see that coming. let me run the numbers on what the chances were

[@MrDutchterminator]

wow, I didn't see that coming. let me run the numbers on what the chances were.

[@lcoi-3200]

If I use the processor in that calculator will I be able to game in 4k resolution.?

[@Царьбббомба-о1о]

kappa kappa yes

[@lcoi-3200]

бомба бытие what about video rendering. It has 12 cores, will that be enough?

[@Царьбббомба-о1о]

kappa kappa lol...

[@lcoi-3200]

I wonder if that calculator comes with a good graphics card

[@lcoi-3200]

And windows 10

[@mlindroth]

Hey Dave, I saw a KZbin video once about turning solar calculators off. Try pressing a bunch of buttons down at once.

[@CreeperGabe]

Why is the calculator upside down at the end of the video?

[@GoldSrc_]

Because BOOBIES lol

[@CreeperGabe]

Gordon Freeman (ノ_＜) =facepalm=

[@hardscorerockkssss]

hi dave do you have any casio f180p?could send it for you

[@TheSentientCloud]

I wouldn't leave any of my electronics near him for 30 seconds. I'll probably find it taken apart when I look back.

[@VolksTrieb]

yeah i got the casio like the big tandy one :) Nice old calc

[@isashach]

I swear it's like every one of your videos is an Infomercial for Agilent!

[@mschwemberger]

10:28 I once had a calculator which had an LED instead of real diodes :D

[@BooBaddyBig]

LEDs are actually real diodes. Real diodes are actually all LEDs too, they're just infrared ones with opaque encapsulation.

[@msk19991]

ASIC's are used to avoid this exact "Hacking" thing.......dead end as far as I know.

[@haukefilm]

wow, my old school calculator. Ahhh memorys ...

[@qw21er43ty65]

Hi Dave, I'm italian too :) may I help you? I love your videos and I would like to give my contribute to this fantastic channel! I would like to help you with the caption, but how can i do it? I never done it before

[@oniruddhoalam2039]

Dave is Australian, not Italian.

[@ExtremeGamer9951]

Whats wrong with VPAM?

[@BarsMonster]

Direct sunlight is 50'000-100'000 lm

[@Dechristian3]

I've got the same exact calculator!

[@darrylf]

Casio uses Sanyo Solar Panel :)

[@gamccoy]

Makes you wonder how TI can still get away with charging $100+ for their top-end gear. It probably cost $5 to manufacture. These devices have almost no BoM and the design cost is now amortized over YEARS for the math software makes it even more egregious.

[@rodlophus]

Dave, do you have plans to tear down that arcade machine of yours?

[@tomboxyz5564]

I think I've got one of these casio calculators, but I don't know where it is... :D

[@iSolarSunrise]

Why do you always type the value of pi into calculators? Why not e? e is a better number :)

[@rockerzac99]

Naughty calculator at the end. Classic!

[@AnanusBananus]

that agilent is on mV not mA...

[@usoppbarbosa981]

yes.. remember it's plugged to the µCurrent box.

[@lexxuzz]

SA5511S4 not 54 :)

[@djlorenz11]

caro mio ti capisco... putroppo a noi italiani l'inglese ce lo fanno vedere a spanne.... fai come me... inizia con libri - telefilm e film in inglese e vedrai che capirai perfettamente il nostro amico australiano... che parla veramente bene ed è comprensibile ;) è l'unico modo, con l'italiano non andrai da nessuna parte... soprattutto nell'elettronica!

[@EEVblog]

Not much to see. Just a single JAMMA board and PSU.

[@WayneJohnsonZastil]

or is it 5318808?

[@Zoomer30]

Capacitors are not something to mess around with. The worst are camera flash capacitors. Make them discharge while holding it and it would probably kill you.

[@WolfmanDude]

Right! But this one is charged to about 2 Volts and has 10uF capacity. A coin cell is more dangerous than this!

[@chrono0097]

The fucking solar panel is more dangerous than that cap!

[@TheSentientCloud]

Ah that's true :D but I tend to destroy everything I take apart >.

[@djscottdog1]

this was very interesting

[@jnbarnesuk]

"VPAM rubbish?" Don't be daft, Dave!

[@08ds]

8008ies...

[@Jolios89]

i used this calculator for 4 years lol

[@asmolbean9300]

For confused Europeans it's called the 82 here

[@cypher526]

mmm... U1273AX WANT!

[@ChristmaswithDean]

Dave, The Agilent seemed to be set on volts, indicated volts, yet you said microamps. Did I miss something or what?

[@FrozenHaxor]

Noooo

[@procrastinatingnerd]

5318008 lol

[@asdcdweadasd]

Well, I'm from Poland and I'm 14, but I understand everything D: Go learn English :P

[@crazy4lego]

pi*e = pie

[@Superminaren]

Am I the only one who noticed his multimeter wasn't set on Amps, but rather Volts?

[@PatrickHansen101]

+Carl Vargklint (AzumCarl) It's because he's using the uCurrent, check 4:07 :) www.eevblog.com/projects/ucurrent/

[@Superminaren]

Patrick Hansen Oh, I see I totally missed that.Thanks for pointing out! :D

[@anonxa]

5,318,008

[@naota3k]

8008135

[@seventeenacres2337]

5318008

[@WayneJohnsonZastil]

8008135 lol

[@Krispi7]

b00b135

[@ChongMcBong]

5318008 :D

[@FrozenHaxor]

First! :P

[@Polished_Perspective]

Casio sucks, TI al the wayyyyyyy!!!

[@armantamboli5722]

Why you sound like age of 80 old man