Relay computer calculates 7 digits of Pi

Calculation of Pi approximation by dividing 355 to 113.
Program outputs digits (one by one) of the result into the register S, which can be observed by the user.
Executed program listing:
; var a
MOVI A, 1 ; 00: 10000000 00000001
MOVI B, 99 ; 01: 10000001 01100011
; var b
MOVI M, 113 ; 02: 10000100 01110001
Main:
Div:
MOVI L, 0 ; 03: 10000110 00000000
Loop:
SUB D, B, M ; 04: 01011011 00011100
SBC C, A, 0 ; 05: 01010010 10001000
JMP C, Exit ; 06: 10110111 00001011
ADD L, L, 1 ; 07: 01001110 11101001
MOV B, D ; 08: 00011001 00110000
MOV A, C ; 09: 00011000 00100000
JMP Loop ; 0a: 10000111 00000100
Exit:
; Display next digit in S
MOV S, L ; 0b: 00011101 01100000
; rem * 2 still less than 256
ADD D, B, B ; 0c: 01001011 00011001
; rem * 4
ADD B, D, D ; 0d: 01001001 00111011
ADC A, A, A ; 0e: 01000000 00001000
; rem * 8
ADD B, B, B ; 0f: 01001001 00011001
ADC A, A, A ; 10: 01000000 00001000
; rem * 10
ADD B, B, D ; 11: 01001001 00011011
ADC A, A, 0 ; 12: 01000000 10001000
JMP Main ; 13: 10000111 00000011
Project page on github: github.com/Dov...

[@Pavel.Dovgalyuk]

Here is another video with the same algorithm, but with teletype output: kzbin.info/www/bejne/fqKwl417hdB6h6c

[@quistan2]

I didn't know the sound of Pi was so intense, it has its own chase music.

[@r.d.machinery3749]

That machine is just beautiful. I have watched the video of it running a dozen times and it still mesmerizes each time.

[@antonnym214]

This is amazing! I used to program in Z-80 and 8080 Assembly, and your source code is similar. I will visit your project for more details, because I'm interested in the architecture. I have subscribed and thumbs-up! P.S. This would look great with a flipdot display!

[@FennecTECH]

What a beautiful peace of equipment. Such an bruitforce combination of electrical and mechanical beauty.

[@randallbanning]

Used to program the 6502 then the 65C02 using the compiler Merlin. I could spend hours buried in assembly language routines, debugging and optimizing just to shave off a few microseconds. Loved it!

[@martinswan9175]

Your computer has me ready to break out some drums. 😄

[@b43xoit]

Magnetic drum storage?

[@iblesbosuok]

Shifting and substracting. This must be result of tens of years effort. Respect.

[@sergatmel8242]

Звуки реле и перемигивание светодиодов просто завораживают. 👍

[@st.charlesstreet9876]

Obviously this machine was properly “Debugged “ 😂 Love this demonstration of the electromechanical devices. 🎉

[@b43xoit]

No doubt each relay comes in its own plastic enclosure.

[@SteelHorseRider74]

this sound definitely has loop-potential ^_^

[@andrerenault]

It’s in 5/4 in case anybody’s wondering

[@EngineerNotFound]

It sounds like a train, a very rhythmic one. The mind boggles at how the calculation is even done, using relays. Beautiful machine...

[@blendpinexus1416]

ok, i want to watch this when you've turned the speed up to as fast as it can do and still be stable

[@tvitaly1]

it's amazing to see this in the 21st century!

[@icarusDaBoi]

3/4 2/4 2/4 3/4 3/4 3/4 2/4 3/4, and so on. This computer loves playing with time signatures

[@b43xoit]

Maybe he has it wired to cut execution short for instructions that don't need all the time steps possible.

[@EngineerNotFound]

I recon there is even 5/4 in there; if you hum Dave Brubeck's 'Take Five' over it, It definitely fits.. Or is it just 3/4 + 2/4 ???

[@lnteIIigence]

I'm glad it was able to do that otherwise we may never have known the answer.

[@jimtekkit]

Really cool machine and it's interesting to see the output in binary.

[@Minecraft-3699]

thanks for *relaying* this information

[@brianshoubert7803]

Прикольная цветомузыка у вас )))

[@thenextwindow]

This is my favorite Steve Reich song

[@okboing]

This is like a primitive maraca that beat and that's why I like relays more than transistors now

[@ideegeniali]

This computer may lack a GPU but definetively has sound capabilities

[@cetocoquinto4704]

Ahhh back in the time where computers are our slaves..now its in reverse hahaha

[@stavinaircaeruleum2275]

Man that computer's laying down some epic beats bro

[@Johny570]

Скачал себе на флешку, в машине буду слушать :)

[@steelyspielbergo]

My grandfather had an old John Deere tractor that sounded like this.

[@Bart_LP]

This is how computers in german federal offices sound.

[@mikip3242]

As a tap dancer, I feel you bro

[@bob4analog]

Is the rhythm of this considered the clock frequency?

[@Pavel.Dovgalyuk]

That's right.

[@Humble_Electronic_Musician]

I hear music 🎶 Nice rhythm ! And awesome PC (personal computer)

[@randomexcessmemories4452]

If I can manage it, I would love to teach myself how to make something like this. Incredible!

[@clarkinthedark1]

same!

[@zidane2k1]

To think that today, the phone in our hands can do this same calculation trillions of times in the time it took this antique relay computer to do it once.

[@ursibar7837]

We neee the 10hr version for sleep!

[@CrimsonSteelMoonTheWolf64]

Something mesmerizing about hearing the computer crunch the numbers via its relay system.

[@K-Effect]

I’d like that beat

[@suspense_comix3237]

Would I recommend using this computer? No. It’s slow. Would I recommend using this computer for calculations in the exam hall and to make music? Absolutely.

[@MisterTrayser]

It's actually a beat with light music

[@yeong126]

What a soothing sound of relays

[@gauribadukale2397]

It sounds sooo satisfying 😍

[@andrewkinsey8754]

KZbin, why do you put such temptation in front of me? This is dork heroin right here

[@Lam-s-Workshop]

What beautiful Melody

[@Xiefux]

just shows how fast modern computers are. on my ryzen 9 3900x it takes only 90 seconds to calculate 1 billion digits of pi. by the time this calculator finishes doing 8 digits i can do over 5 billion

[@ibrozdemir]

dancing in middle of my room in a very weird fashion

[@ahbushnell1]

1e-6 MIPS

[@szaracenzsakos6952]

This sound like is fast steam engine.

[@TexasRailfan2008]

Szaracén Zsákos yeah it kinda does

[@ijunkie]

And this is why the mechanical computer era never lasted more than a few years.

[@jannejohansson3383]

It was needed.

[@PRH123]

Mechanical computers were used on navy ships for more than 50 years…. mechanical calculators were used for 100 years….

[@ijunkie]

@@PRH123 In specific applications, analog computers are useful, yes.

[@JoelLessing]

@@ijunkie This is digital, not analog. It’s just slow, that’s all.

[@Logic44]

Out of all the sounds I expected, none of them were "Steam locomotive" lmao

[@SirSoup420]

What is the name of the algorithm you used?

[@Pavel.Dovgalyuk]

This is a digit-by-digit calculation of a fraction 355/113

[@bbqgiraffe3766]

Huh interesting choice to display the LSB on the right instead of the left

[@Civsuccess2]

Can't believe how slow it can be. Had to wait minutes for a digit to pop out.

[@Dont_Gnaw_on_the_Kitty_1]

That's not a computer, it's a drum machine.

[@twogitsinacar4811]

Fantastic

[@TymexComputing]

oh, its dividing the hierarchical fraction approximation - still very nice rythm :)

[@CT--od7ux]

that's a good song

[@joujimiumiu]

Incredible !!

[@roberto4898]

The devil is moving those relays 😂.

[@JoshuaF.]

i am a simple man i see relay, i like i see pi, i like

[@ursibar7837]

Stand up for the computer anthem!

[@muffinstuff6195]

POV: Hans Zimmer composing the dark knight score

[@dev5576]

i was really hoping for some bass to kick in

[@satanbane]

It might be nice to have it make a sound every time it computes a new digit; may I suggest, the sound of a steam train whistle.

[@BlackEpyon]

Did you put LEDs inside the relay modules? That is so cool! I love blinkenlights!

[@Pavel.Dovgalyuk]

There are relay modules with embedded LEDs.

[@BlackEpyon]

@@Pavel.Dovgalyuk I didn't know they came with LEDs.

[@pgfinna]

Sounds like a Steve Reich song

[@luiscosta4945]

Is this a rhytm machine? Nice Grooooooove!

[@choppergirl]

Nice beat... easy to dance to... I give it a 4 out of 5 stars Seems to take up a lot of space. And I wouldn't want tho to wait on it and listen to it... all day long Is there any way you could make it faster and quieter and like shrink it down some?

[@sophiacristina]

I also like Minimal Techno...

[@alissoncandatem1896]

Ok this a really weird Javascript Library i'm gonna head out

[@ml.2770]

Move aside pencil and paper. We've got time and kW to burn!

[@RideiKarim-w8g]

the quality of the relay must be very good :-)

[@koppadasao]

Sounds musical...

[@normannormiemates4844]

music!

[@soteful9949]

cool beat, when is the guitar solo?

[@pauliedweasel]

It’s got a beat you can dance to!

[@mdh_1984]

Мощьно

[@ihavetwofaces]

Oh, man. My mom loved Lord of the Dance, lol.

[@TheMiniatureRobot]

Incredible! But can it run doom? Crysis?

[@Amberstargazerofearth]

Очень впечатляет! Однако, или реле старой конструкции, или их тысячи одновременно в работе?

[@Pavel.Dovgalyuk]

Ну их не тысячи, а две-три сотни. Но это не герконовые реле, конечно.

[@oiytd5wugho]

Is this the whole "math rock" thing they were talking about?

[@Locksharpe]

5:55 is it coming down with the sickness?

[@bobhowe5919]

Somebody needs to duet this.

[@aternias]

About 10 Hz clock signal

[@KevinEontrainer381]

I was waiting for the base to drop...

[@matthewhuddleston9052]

Any relation to Steve Reich or the Marble machine?

[@Pavel.Dovgalyuk]

No, I haven't seen it.

[@neriozulberti1492]

Alan Turing is smiling 😊

[@putrescentvermin]

I feel like someone could rap over this.

[@liljames2k]

Why it calculates the wrong Number at the end?

[@Pavel.Dovgalyuk]

Because it calculates a fraction, which is only the approximation of Pi.

[@Gazdatronik]

@@Pavel.Dovgalyuk ok. but why was it doing well until that point? not enough registers for that many decimal places? Its giving me much more appreciation for the eggheads who figured this out on paper hundreds of years ago.

[@Pavel.Dovgalyuk]

@@Gazdatronik I don't know who and how found this approximation.

[@emmata98]

​​@@Gazdatronik the first recorded methods were with regular n-gons. But the info is rare. Edit: the fraction is just that off. Like 3 is just 0.33333... off of 10/3.

[@n10cities]

Cool! But can it play Crysis? (I know..... tired old meme, but couldn't resist) ;) Have never seen one of these before.

[@ralfrosenberger666]

How long does it take to render a 4k-Video 😉

[@Mark_Ocain]

cool!

[@jptrainor]

It needs a base line and a melody.

[@archivushka]

I'm gonna ask the age old question: Will it run doom?

[@WigWagWorkshop]

Intro to Mr Brownstone by Guns n Roses

[@my_unreasonably_long_username]

what is the size of the power supply on this thing?

[@Pavel.Dovgalyuk]

There is a big rectangular module in the bottom of every unit of the computer.

[@Nickfisch1]

Music when?

[@olavschioett4101]

Man that is soo cool❤️

[@VR_SHOW]

That sound ❤️ (like train)

[@MrPickle21100]

You forgot to carry the click clack

[@blanana_m]

Somebody make a song outta this

[@jareknowak8712]

Will it run crysis?

[@railgap]

Has anyone set this to music?